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

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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: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks 2010-04-28 18:10:02 +09:00
parent 7cfdee9f67
commit e561aacc70
2 changed files with 54 additions and 32 deletions
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35
arch/arm/mach-s3c64xx/include/mach/pll.h
View File

@ -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));
}

51
arch/arm/plat-samsung/include/plat/pll6553x.h Normal file
View File

@ -0,0 +1,51 @@
/* 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;
}