[ARM] S3C64XX: Add PLL definitions

/* arch/arm/plat-s3c64xx/include/plat/pll.h

 *

 * Copyright 2008 Openmoko, Inc.

 * Copyright 2008 Simtec Electronics

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

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

 *

 * S3C64XX PLL code

 *

 * 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.

*/

#define S3C6400_PLL_MDIV_MASK	((1 << (25-16)) - 1)

#define S3C6400_PLL_PDIV_MASK	((1 << (13-8)) - 1)

#define S3C6400_PLL_SDIV_MASK	((1 << (2-0)) - 1)

#define S3C6400_PLL_MDIV_SHIFT	(16)

#define S3C6400_PLL_PDIV_SHIFT	(8)

#define S3C6400_PLL_SDIV_SHIFT	(0)

#include <asm/div64.h>

static inline unsigned long s3c6400_get_pll(unsigned long baseclk,

					    u32 pllcon)

{

	u32 mdiv, pdiv, sdiv;

	u64 fvco = baseclk;

	mdiv = (pllcon >> S3C6400_PLL_MDIV_SHIFT) & S3C6400_PLL_MDIV_MASK;

	pdiv = (pllcon >> S3C6400_PLL_PDIV_SHIFT) & S3C6400_PLL_PDIV_MASK;

	sdiv = (pllcon >> S3C6400_PLL_SDIV_SHIFT) & S3C6400_PLL_SDIV_MASK;

	fvco *= mdiv;

	do_div(fvco, (pdiv << sdiv));

	return (unsigned long)fvco;

}

#define S3C6400_EPLL_MDIV_MASK	((1 << (23-16)) - 1)

#define S3C6400_EPLL_PDIV_MASK	((1 << (13-8)) - 1)

#define S3C6400_EPLL_SDIV_MASK	((1 << (2-0)) - 1)

#define S3C6400_EPLL_MDIV_SHIFT	(16)

#define S3C6400_EPLL_PDIV_SHIFT	(8)

#define S3C6400_EPLL_SDIV_SHIFT	(0)

#define S3C6400_EPLL_KDIV_MASK  (0xffff)

static inline unsigned long s3c6400_get_epll(unsigned long baseclk)

{

	unsigned long result;

	u32 epll0 = __raw_readl(S3C_EPLL_CON0);

	u32 epll1 = __raw_readl(S3C_EPLL_CON1);

	u32 mdiv, pdiv, sdiv, kdiv;

	u64 tmp;

	mdiv = (epll0 >> S3C6400_EPLL_MDIV_SHIFT) & S3C6400_EPLL_MDIV_MASK;

	pdiv = (epll0 >> S3C6400_EPLL_PDIV_SHIFT) & S3C6400_EPLL_PDIV_MASK;

	sdiv = (epll0 >> S3C6400_EPLL_SDIV_SHIFT) & S3C6400_EPLL_SDIV_MASK;

	kdiv = epll1 & S3C6400_EPLL_KDIV_MASK;

	/* We need to multiple baseclk by mdiv (the integer part) and kdiv

	 * which is in 2^16ths, so shift mdiv up (does not overflow) and

	 * add kdiv before multiplying. The use of tmp is to avoid any

	 * overflows before shifting bac down into result when multipling

	 * by the mdiv and kdiv pair.

	 */

	tmp = baseclk;

	tmp *= (mdiv << 16) + kdiv;

	do_div(tmp, (pdiv << sdiv));

	result = tmp >> 16;

	return result;

}