arch/arm/mach-s3c2443/clock.c - kernel/msm-4.19 - Gitiles

 /* linux/arch/arm/mach-s3c2443/clock.c
  *
  * Copyright (c) 2007, 2010 Simtec Electronics
  *	Ben Dooks <ben@simtec.co.uk>
  *
  * S3C2443 Clock control support
  *
  * 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, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that 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, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

 #include <linux/init.h>

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/sysdev.h>
 #include <linux/clk.h>
 #include <linux/mutex.h>
 #include <linux/serial_core.h>
 #include <linux/io.h>

 #include <asm/mach/map.h>

 #include <mach/hardware.h>

 #include <mach/regs-s3c2443-clock.h>

 #include <plat/cpu-freq.h>

 #include <plat/s3c2443.h>
 #include <plat/clock.h>
 #include <plat/clock-clksrc.h>
 #include <plat/cpu.h>

 /* We currently have to assume that the system is running
  * from the XTPll input, and that all ***REFCLKs are being
  * fed from it, as we cannot read the state of OM[4] from
  * software.
  *
  * It would be possible for each board initialisation to
  * set the correct muxing at initialisation
 */

 /* clock selections */

 static struct clk clk_i2s_ext = {
 	.name		= "i2s-ext",
 };

 /* armdiv
  *
  * this clock is sourced from msysclk and can have a number of
  * divider values applied to it to then be fed into armclk.
 */

 /* armdiv divisor table */

 static unsigned int armdiv[16] = {
 	[S3C2443_CLKDIV0_ARMDIV_1 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]	= 1,
 	[S3C2443_CLKDIV0_ARMDIV_2 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]	= 2,
 	[S3C2443_CLKDIV0_ARMDIV_3 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]	= 3,
 	[S3C2443_CLKDIV0_ARMDIV_4 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]	= 4,
 	[S3C2443_CLKDIV0_ARMDIV_6 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]	= 6,
 	[S3C2443_CLKDIV0_ARMDIV_8 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]	= 8,
 	[S3C2443_CLKDIV0_ARMDIV_12 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]	= 12,
 	[S3C2443_CLKDIV0_ARMDIV_16 >> S3C2443_CLKDIV0_ARMDIV_SHIFT]	= 16,
 };

 static inline unsigned int s3c2443_fclk_div(unsigned long clkcon0)
 {
 	clkcon0 &= S3C2443_CLKDIV0_ARMDIV_MASK;

 	return armdiv[clkcon0 >> S3C2443_CLKDIV0_ARMDIV_SHIFT];
 }

 static unsigned long s3c2443_armclk_roundrate(struct clk *clk,
 					      unsigned long rate)
 {
 	unsigned long parent = clk_get_rate(clk->parent);
 	unsigned long calc;
 	unsigned best = 256; /* bigger than any value */
 	unsigned div;
 	int ptr;

 	for (ptr = 0; ptr < ARRAY_SIZE(armdiv); ptr++) {
 		div = armdiv[ptr];
 		calc = parent / div;
 		if (calc <= rate && div < best)
 			best = div;
 	}

 	return parent / best;
 }

 static int s3c2443_armclk_setrate(struct clk *clk, unsigned long rate)
 {
 	unsigned long parent = clk_get_rate(clk->parent);
 	unsigned long calc;
 	unsigned div;
 	unsigned best = 256; /* bigger than any value */
 	int ptr;
 	int val = -1;

 	for (ptr = 0; ptr < ARRAY_SIZE(armdiv); ptr++) {
 		div = armdiv[ptr];
 		calc = parent / div;
 		if (calc <= rate && div < best) {
 			best = div;
 			val = ptr;
 		}
 	}

 	if (val >= 0) {
 		unsigned long clkcon0;

 		clkcon0 = __raw_readl(S3C2443_CLKDIV0);
 		clkcon0 &= ~S3C2443_CLKDIV0_ARMDIV_MASK;
 		clkcon0 |= val << S3C2443_CLKDIV0_ARMDIV_SHIFT;
 		__raw_writel(clkcon0, S3C2443_CLKDIV0);
 	}

 	return (val == -1) ? -EINVAL : 0;
 }

 static struct clk clk_armdiv = {
 	.name		= "armdiv",
 	.parent		= &clk_msysclk.clk,
 	.ops		= &(struct clk_ops) {
 		.round_rate = s3c2443_armclk_roundrate,
 		.set_rate = s3c2443_armclk_setrate,
 	},
 };

 /* armclk
  *
  * this is the clock fed into the ARM core itself, from armdiv or from hclk.
  */

 static struct clk *clk_arm_sources[] = {
 	[0] = &clk_armdiv,
 	[1] = &clk_h,
 };

 static struct clksrc_clk clk_arm = {
 	.clk	= {
 		.name		= "armclk",
 	},
 	.sources = &(struct clksrc_sources) {
 		.sources = clk_arm_sources,
 		.nr_sources = ARRAY_SIZE(clk_arm_sources),
 	},
 	.reg_src = { .reg = S3C2443_CLKDIV0, .size = 1, .shift = 13 },
 };

 /* hsspi
  *
  * high-speed spi clock, sourced from esysclk
 */

 static struct clksrc_clk clk_hsspi = {
 	.clk	= {
 		.name		= "hsspi",
 		.parent		= &clk_esysclk.clk,
 		.ctrlbit	= S3C2443_SCLKCON_HSSPICLK,
 		.enable		= s3c2443_clkcon_enable_s,
 	},
 	.reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 4 },
 };


 /* clk_hsmcc_div
  *
  * this clock is sourced from epll, and is fed through a divider,
  * to a mux controlled by sclkcon where either it or a extclk can
  * be fed to the hsmmc block
 */

 static struct clksrc_clk clk_hsmmc_div = {
 	.clk	= {
 		.name		= "hsmmc-div",
 		.devname	= "s3c-sdhci.1",
 		.parent		= &clk_esysclk.clk,
 	},
 	.reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 6 },
 };

 static int s3c2443_setparent_hsmmc(struct clk *clk, struct clk *parent)
 {
 	unsigned long clksrc = __raw_readl(S3C2443_SCLKCON);

 	clksrc &= ~(S3C2443_SCLKCON_HSMMCCLK_EXT |
 		    S3C2443_SCLKCON_HSMMCCLK_EPLL);

 	if (parent == &clk_epll)
 		clksrc |= S3C2443_SCLKCON_HSMMCCLK_EPLL;
 	else if (parent == &clk_ext)
 		clksrc |= S3C2443_SCLKCON_HSMMCCLK_EXT;
 	else
 		return -EINVAL;

 	if (clk->usage > 0) {
 		__raw_writel(clksrc, S3C2443_SCLKCON);
 	}

 	clk->parent = parent;
 	return 0;
 }

 static int s3c2443_enable_hsmmc(struct clk *clk, int enable)
 {
 	return s3c2443_setparent_hsmmc(clk, clk->parent);
 }

 static struct clk clk_hsmmc = {
 	.name		= "hsmmc-if",
 	.devname	= "s3c-sdhci.1",
 	.parent		= &clk_hsmmc_div.clk,
 	.enable		= s3c2443_enable_hsmmc,
 	.ops		= &(struct clk_ops) {
 		.set_parent	= s3c2443_setparent_hsmmc,
 	},
 };

 /* i2s_eplldiv
  *
  * This clock is the output from the I2S divisor of ESYSCLK, and is separate
  * from the mux that comes after it (cannot merge into one single clock)
 */

 static struct clksrc_clk clk_i2s_eplldiv = {
 	.clk	= {
 		.name		= "i2s-eplldiv",
 		.parent		= &clk_esysclk.clk,
 	},
 	.reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 12, },
 };

 /* i2s-ref
  *
  * i2s bus reference clock, selectable from external, esysclk or epllref
  *
  * Note, this used to be two clocks, but was compressed into one.
 */

 struct clk *clk_i2s_srclist[] = {
 	[0] = &clk_i2s_eplldiv.clk,
 	[1] = &clk_i2s_ext,
 	[2] = &clk_epllref.clk,
 	[3] = &clk_epllref.clk,
 };

 static struct clksrc_clk clk_i2s = {
 	.clk	= {
 		.name		= "i2s-if",
 		.ctrlbit	= S3C2443_SCLKCON_I2SCLK,
 		.enable		= s3c2443_clkcon_enable_s,

 	},
 	.sources = &(struct clksrc_sources) {
 		.sources = clk_i2s_srclist,
 		.nr_sources = ARRAY_SIZE(clk_i2s_srclist),
 	},
 	.reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 14 },
 };

 /* standard clock definitions */

 static struct clk init_clocks_off[] = {
 	{
 		.name		= "sdi",
 		.parent		= &clk_p,
 		.enable		= s3c2443_clkcon_enable_p,
 		.ctrlbit	= S3C2443_PCLKCON_SDI,
 	}, {
 		.name		= "iis",
 		.parent		= &clk_p,
 		.enable		= s3c2443_clkcon_enable_p,
 		.ctrlbit	= S3C2443_PCLKCON_IIS,
 	}, {
 		.name		= "spi",
 		.devname	= "s3c2410-spi.0",
 		.parent		= &clk_p,
 		.enable		= s3c2443_clkcon_enable_p,
 		.ctrlbit	= S3C2443_PCLKCON_SPI0,
 	}, {
 		.name		= "spi",
 		.devname	= "s3c2410-spi.1",
 		.parent		= &clk_p,
 		.enable		= s3c2443_clkcon_enable_p,
 		.ctrlbit	= S3C2443_PCLKCON_SPI1,
 	}
 };

 static struct clk init_clocks[] = {
 };

 /* clocks to add straight away */

 static struct clksrc_clk *clksrcs[] __initdata = {
 	&clk_arm,
 	&clk_i2s_eplldiv,
 	&clk_i2s,
 	&clk_hsspi,
 	&clk_hsmmc_div,
 };

 static struct clk *clks[] __initdata = {
 	&clk_hsmmc,
 	&clk_armdiv,
 };

 void __init_or_cpufreq s3c2443_setup_clocks(void)
 {
 	s3c2443_common_setup_clocks(s3c2443_get_mpll, s3c2443_fclk_div);
 }

 void __init s3c2443_init_clocks(int xtal)
 {
 	unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
 	int ptr;

 	clk_epll.rate = s3c2443_get_epll(epllcon, xtal);
 	clk_epll.parent = &clk_epllref.clk;

 	s3c2443_common_init_clocks(xtal, s3c2443_get_mpll, s3c2443_fclk_div);

 	s3c2443_setup_clocks();

 	s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));

 	for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
 		s3c_register_clksrc(clksrcs[ptr], 1);

 	/* register clocks from clock array */

 	s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));

 	/* We must be careful disabling the clocks we are not intending to
 	 * be using at boot time, as subsystems such as the LCD which do
 	 * their own DMA requests to the bus can cause the system to lockup
 	 * if they where in the middle of requesting bus access.
 	 *
 	 * Disabling the LCD clock if the LCD is active is very dangerous,
 	 * and therefore the bootloader should be careful to not enable
 	 * the LCD clock if it is not needed.
 	*/

 	/* install (and disable) the clocks we do not need immediately */

 	s3c_register_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
 	s3c_disable_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));

 	s3c_pwmclk_init();
 }
	/* linux/arch/arm/mach-s3c2443/clock.c
	*
	* Copyright (c) 2007, 2010 Simtec Electronics
	* Ben Dooks <ben@simtec.co.uk>
	*
	* S3C2443 Clock control support
	*
	* 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, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that 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, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/init.h>

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/list.h>
	#include <linux/errno.h>
	#include <linux/err.h>
	#include <linux/sysdev.h>
	#include <linux/clk.h>
	#include <linux/mutex.h>
	#include <linux/serial_core.h>
	#include <linux/io.h>

	#include <asm/mach/map.h>

	#include <mach/hardware.h>

	#include <mach/regs-s3c2443-clock.h>

	#include <plat/cpu-freq.h>

	#include <plat/s3c2443.h>
	#include <plat/clock.h>
	#include <plat/clock-clksrc.h>
	#include <plat/cpu.h>

	/* We currently have to assume that the system is running
	* from the XTPll input, and that all ***REFCLKs are being
	* fed from it, as we cannot read the state of OM[4] from
	* software.
	*
	* It would be possible for each board initialisation to
	* set the correct muxing at initialisation
	*/

	/* clock selections */

	static struct clk clk_i2s_ext = {
	.name = "i2s-ext",
	};

	/* armdiv
	*
	* this clock is sourced from msysclk and can have a number of
	* divider values applied to it to then be fed into armclk.
	*/

	/* armdiv divisor table */

	static unsigned int armdiv[16] = {
	[S3C2443_CLKDIV0_ARMDIV_1 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 1,
	[S3C2443_CLKDIV0_ARMDIV_2 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 2,
	[S3C2443_CLKDIV0_ARMDIV_3 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 3,
	[S3C2443_CLKDIV0_ARMDIV_4 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 4,
	[S3C2443_CLKDIV0_ARMDIV_6 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 6,
	[S3C2443_CLKDIV0_ARMDIV_8 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 8,
	[S3C2443_CLKDIV0_ARMDIV_12 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 12,
	[S3C2443_CLKDIV0_ARMDIV_16 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 16,
	};

	static inline unsigned int s3c2443_fclk_div(unsigned long clkcon0)
	{
	clkcon0 &= S3C2443_CLKDIV0_ARMDIV_MASK;

	return armdiv[clkcon0 >> S3C2443_CLKDIV0_ARMDIV_SHIFT];
	}

	static unsigned long s3c2443_armclk_roundrate(struct clk *clk,
	unsigned long rate)
	{
	unsigned long parent = clk_get_rate(clk->parent);
	unsigned long calc;
	unsigned best = 256; /* bigger than any value */
	unsigned div;
	int ptr;

	for (ptr = 0; ptr < ARRAY_SIZE(armdiv); ptr++) {
	div = armdiv[ptr];
	calc = parent / div;
	if (calc <= rate && div < best)
	best = div;
	}

	return parent / best;
	}

	static int s3c2443_armclk_setrate(struct clk *clk, unsigned long rate)
	{
	unsigned long parent = clk_get_rate(clk->parent);
	unsigned long calc;
	unsigned div;
	unsigned best = 256; /* bigger than any value */
	int ptr;
	int val = -1;

	for (ptr = 0; ptr < ARRAY_SIZE(armdiv); ptr++) {
	div = armdiv[ptr];
	calc = parent / div;
	if (calc <= rate && div < best) {
	best = div;
	val = ptr;
	}
	}

	if (val >= 0) {
	unsigned long clkcon0;

	clkcon0 = __raw_readl(S3C2443_CLKDIV0);
	clkcon0 &= ~S3C2443_CLKDIV0_ARMDIV_MASK;
	clkcon0 \|= val << S3C2443_CLKDIV0_ARMDIV_SHIFT;
	__raw_writel(clkcon0, S3C2443_CLKDIV0);
	}

	return (val == -1) ? -EINVAL : 0;
	}

	static struct clk clk_armdiv = {
	.name = "armdiv",
	.parent = &clk_msysclk.clk,
	.ops = &(struct clk_ops) {
	.round_rate = s3c2443_armclk_roundrate,
	.set_rate = s3c2443_armclk_setrate,
	},
	};

	/* armclk
	*
	* this is the clock fed into the ARM core itself, from armdiv or from hclk.
	*/

	static struct clk *clk_arm_sources[] = {
	[0] = &clk_armdiv,
	[1] = &clk_h,
	};

	static struct clksrc_clk clk_arm = {
	.clk = {
	.name = "armclk",
	},
	.sources = &(struct clksrc_sources) {
	.sources = clk_arm_sources,
	.nr_sources = ARRAY_SIZE(clk_arm_sources),
	},
	.reg_src = { .reg = S3C2443_CLKDIV0, .size = 1, .shift = 13 },
	};

	/* hsspi
	*
	* high-speed spi clock, sourced from esysclk
	*/

	static struct clksrc_clk clk_hsspi = {
	.clk = {
	.name = "hsspi",
	.parent = &clk_esysclk.clk,
	.ctrlbit = S3C2443_SCLKCON_HSSPICLK,
	.enable = s3c2443_clkcon_enable_s,
	},
	.reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 4 },
	};


	/* clk_hsmcc_div
	*
	* this clock is sourced from epll, and is fed through a divider,
	* to a mux controlled by sclkcon where either it or a extclk can
	* be fed to the hsmmc block
	*/

	static struct clksrc_clk clk_hsmmc_div = {
	.clk = {
	.name = "hsmmc-div",
	.devname = "s3c-sdhci.1",
	.parent = &clk_esysclk.clk,
	},
	.reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 6 },
	};

	static int s3c2443_setparent_hsmmc(struct clk clk, struct clk parent)
	{
	unsigned long clksrc = __raw_readl(S3C2443_SCLKCON);

	clksrc &= ~(S3C2443_SCLKCON_HSMMCCLK_EXT \|
	S3C2443_SCLKCON_HSMMCCLK_EPLL);

	if (parent == &clk_epll)
	clksrc \|= S3C2443_SCLKCON_HSMMCCLK_EPLL;
	else if (parent == &clk_ext)
	clksrc \|= S3C2443_SCLKCON_HSMMCCLK_EXT;
	else
	return -EINVAL;

	if (clk->usage > 0) {
	__raw_writel(clksrc, S3C2443_SCLKCON);
	}

	clk->parent = parent;
	return 0;
	}

	static int s3c2443_enable_hsmmc(struct clk *clk, int enable)
	{
	return s3c2443_setparent_hsmmc(clk, clk->parent);
	}

	static struct clk clk_hsmmc = {
	.name = "hsmmc-if",
	.devname = "s3c-sdhci.1",
	.parent = &clk_hsmmc_div.clk,
	.enable = s3c2443_enable_hsmmc,
	.ops = &(struct clk_ops) {
	.set_parent = s3c2443_setparent_hsmmc,
	},
	};

	/* i2s_eplldiv
	*
	* This clock is the output from the I2S divisor of ESYSCLK, and is separate
	* from the mux that comes after it (cannot merge into one single clock)
	*/

	static struct clksrc_clk clk_i2s_eplldiv = {
	.clk = {
	.name = "i2s-eplldiv",
	.parent = &clk_esysclk.clk,
	},
	.reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 12, },
	};

	/* i2s-ref
	*
	* i2s bus reference clock, selectable from external, esysclk or epllref
	*
	* Note, this used to be two clocks, but was compressed into one.
	*/

	struct clk *clk_i2s_srclist[] = {
	[0] = &clk_i2s_eplldiv.clk,
	[1] = &clk_i2s_ext,
	[2] = &clk_epllref.clk,
	[3] = &clk_epllref.clk,
	};

	static struct clksrc_clk clk_i2s = {
	.clk = {
	.name = "i2s-if",
	.ctrlbit = S3C2443_SCLKCON_I2SCLK,
	.enable = s3c2443_clkcon_enable_s,

	},
	.sources = &(struct clksrc_sources) {
	.sources = clk_i2s_srclist,
	.nr_sources = ARRAY_SIZE(clk_i2s_srclist),
	},
	.reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 14 },
	};

	/* standard clock definitions */

	static struct clk init_clocks_off[] = {
	{
	.name = "sdi",
	.parent = &clk_p,
	.enable = s3c2443_clkcon_enable_p,
	.ctrlbit = S3C2443_PCLKCON_SDI,
	}, {
	.name = "iis",
	.parent = &clk_p,
	.enable = s3c2443_clkcon_enable_p,
	.ctrlbit = S3C2443_PCLKCON_IIS,
	}, {
	.name = "spi",
	.devname = "s3c2410-spi.0",
	.parent = &clk_p,
	.enable = s3c2443_clkcon_enable_p,
	.ctrlbit = S3C2443_PCLKCON_SPI0,
	}, {
	.name = "spi",
	.devname = "s3c2410-spi.1",
	.parent = &clk_p,
	.enable = s3c2443_clkcon_enable_p,
	.ctrlbit = S3C2443_PCLKCON_SPI1,
	}
	};

	static struct clk init_clocks[] = {
	};

	/* clocks to add straight away */

	static struct clksrc_clk *clksrcs[] __initdata = {
	&clk_arm,
	&clk_i2s_eplldiv,
	&clk_i2s,
	&clk_hsspi,
	&clk_hsmmc_div,
	};

	static struct clk *clks[] __initdata = {
	&clk_hsmmc,
	&clk_armdiv,
	};

	void __init_or_cpufreq s3c2443_setup_clocks(void)
	{
	s3c2443_common_setup_clocks(s3c2443_get_mpll, s3c2443_fclk_div);
	}

	void __init s3c2443_init_clocks(int xtal)
	{
	unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
	int ptr;

	clk_epll.rate = s3c2443_get_epll(epllcon, xtal);
	clk_epll.parent = &clk_epllref.clk;

	s3c2443_common_init_clocks(xtal, s3c2443_get_mpll, s3c2443_fclk_div);

	s3c2443_setup_clocks();

	s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));

	for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
	s3c_register_clksrc(clksrcs[ptr], 1);

	/* register clocks from clock array */

	s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));

	/* We must be careful disabling the clocks we are not intending to
	* be using at boot time, as subsystems such as the LCD which do
	* their own DMA requests to the bus can cause the system to lockup
	* if they where in the middle of requesting bus access.
	*
	* Disabling the LCD clock if the LCD is active is very dangerous,
	* and therefore the bootloader should be careful to not enable
	* the LCD clock if it is not needed.
	*/

	/* install (and disable) the clocks we do not need immediately */

	s3c_register_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
	s3c_disable_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));

	s3c_pwmclk_init();
	}