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Commit e561aacc authored by Ben Dooks's avatar Ben Dooks
Browse files

ARM: SAMSUNG: Move S3C6400 PLL code to <plat/pll.h> for re-use 



The S3C6400 EPLL code matches the S3C2416 and compatible SoCs, so move
it from mach-s3c64xx into <plat/pll.h> for easy reuse.

Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent 7cfdee9f

arch/arm/mach-s3c64xx/include/mach/pll.h

+3 −32
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#define S3C6400_PLL_SDIV_SHIFT	(0)



#include <asm/div64.h>

#include <plat/pll6553x.h>



static inline unsigned long s3c6400_get_pll(unsigned long baseclk,

					    u32 pllcon)
@@ -37,38 +38,8 @@ static inline unsigned long s3c6400_get_pll(unsigned long baseclk, 
	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;

	return s3c_get_pll6553x(baseclk, __raw_readl(S3C_EPLL_CON0),

				__raw_readl(S3C_EPLL_CON1));

}

arch/arm/plat-samsung/include/plat/pll6553x.h

0 → 100644
+51 −0
Original line number Diff line number Diff line 
/* arch/arm/plat-samsung/include/plat/pll6553x.h

 *	partially from arch/arm/mach-s3c64xx/include/mach/pll.h

 *

 * Copyright 2008 Openmoko, Inc.

 * Copyright 2008 Simtec Electronics

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

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

 *

 * Samsung PLL6553x 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.

*/



/* S3C6400 and compatible (S3C2416, etc.) EPLL code */



#define PLL6553X_MDIV_MASK	((1 << (23-16)) - 1)

#define PLL6553X_PDIV_MASK	((1 << (13-8)) - 1)

#define PLL6553X_SDIV_MASK	((1 << (2-0)) - 1)

#define PLL6553X_MDIV_SHIFT	(16)

#define PLL6553X_PDIV_SHIFT	(8)

#define PLL6553X_SDIV_SHIFT	(0)

#define PLL6553X_KDIV_MASK	(0xffff)



static inline unsigned long s3c_get_pll6553x(unsigned long baseclk,

					     u32 pll0, u32 pll1)

{

	unsigned long result;

	u32 mdiv, pdiv, sdiv, kdiv;

	u64 tmp;



	mdiv = (pll0 >> PLL6553X_MDIV_SHIFT) & PLL6553X_MDIV_MASK;

	pdiv = (pll0 >> PLL6553X_PDIV_SHIFT) & PLL6553X_PDIV_MASK;

	sdiv = (pll0 >> PLL6553X_SDIV_SHIFT) & PLL6553X_SDIV_MASK;

	kdiv = pll1 & PLL6553X_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;

}