[ARM] S3C: Add <plat/cpu-freq.h> for initial cpufreq definitions

/* arch/arm/plat-s3c/include/plat/cpu-freq.h

 *

 * Copyright (c) 2006,2007 Simtec Electronics

 *	http://armlinux.simtec.co.uk/

 *	Ben Dooks <ben@simtec.co.uk>

 *

 * S3C CPU frequency scaling support - driver and board

 *

 * 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.

*/

#include <linux/cpufreq.h>

struct s3c_cpufreq_info;

struct s3c_cpufreq_board;

struct s3c_iotimings;

struct s3c_freq {

	unsigned long	fclk;

	unsigned long	armclk;

	unsigned long	hclk_tns;	/* in 10ths of ns */

	unsigned long	hclk;

	unsigned long	pclk;

};

/* wrapper 'struct cpufreq_freqs' so that any drivers receiving the

 * notification can use this information that is not provided by just

 * having the core frequency alone.

 */

struct s3c_cpufreq_freqs {

	struct cpufreq_freqs	freqs;

	struct s3c_freq		old;

	struct s3c_freq		new;

};

#define to_s3c_cpufreq(_cf) container_of(_cf, struct s3c_cpufreq_freqs, freqs)

struct s3c_clkdivs {

	int		p_divisor;	/* fclk / pclk */

	int		h_divisor;	/* fclk / hclk */

	int		arm_divisor;	/* not all cpus have this. */

	unsigned char	dvs;		/* using dvs mode to arm. */

};

#define PLLVAL(_m, _p, _s) (((_m) << 12) | ((_p) << 4) | (_s))

struct s3c_pllval {

	unsigned long		freq;

	unsigned long		pll_reg;

};

struct s3c_cpufreq_config {

	struct s3c_freq		freq;

	struct s3c_pllval	pll;

	struct s3c_clkdivs	divs;

	struct s3c_cpufreq_info *info;	/* for core, not drivers */

	struct s3c_cpufreq_board *board;

};

/* s3c_cpufreq_board

 *

 * per-board configuraton information, such as memory refresh and

 * how to initialise IO timings.

 */

struct s3c_cpufreq_board {

	unsigned int	refresh;	/* refresh period in ns */

	unsigned int	auto_io:1;	/* automatically init io timings. */

	unsigned int	need_io:1;	/* set if needs io timing support. */

	/* any non-zero field in here is taken as an upper limit. */

	struct s3c_freq	max;	/* frequency limits */

};

/* Things depending on frequency scaling. */

#ifdef CONFIG_CPU_FREQ_S3C

#define __init_or_cpufreq

#else

#define __init_or_cpufreq __init

#endif

/* Board functions */

#ifdef CONFIG_CPU_FREQ_S3C

extern int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board);

#else

static inline int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board)

{

	return 0;

}

#endif  /* CONFIG_CPU_FREQ_S3C */