11e3bd0923
Correct the PLL field masks to ensure the PLL functions return the right value. Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> [ben-linux@fluff.org: improve the description text] Signed-off-by: Ben Dooks <ben-linux@fluff.org>
75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/* 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)) - 1)
|
|
#define S3C6400_PLL_PDIV_MASK ((1 << (13-8+1)) - 1)
|
|
#define S3C6400_PLL_SDIV_MASK ((1 << (2-0+1)) - 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;
|
|
}
|