1
/* arch/arm/plat-s3c64xx/include/plat/pll.h
3
* Copyright 2008 Openmoko, Inc.
4
* Copyright 2008 Simtec Electronics
5
* Ben Dooks <ben@simtec.co.uk>
6
* http://armlinux.simtec.co.uk/
10
* This program is free software; you can redistribute it and/or modify
11
* it under the terms of the GNU General Public License version 2 as
12
* published by the Free Software Foundation.
15
#define S3C6400_PLL_MDIV_MASK ((1 << (25-16+1)) - 1)
16
#define S3C6400_PLL_PDIV_MASK ((1 << (13-8+1)) - 1)
17
#define S3C6400_PLL_SDIV_MASK ((1 << (2-0+1)) - 1)
18
#define S3C6400_PLL_MDIV_SHIFT (16)
19
#define S3C6400_PLL_PDIV_SHIFT (8)
20
#define S3C6400_PLL_SDIV_SHIFT (0)
22
#include <asm/div64.h>
24
static inline unsigned long s3c6400_get_pll(unsigned long baseclk,
30
mdiv = (pllcon >> S3C6400_PLL_MDIV_SHIFT) & S3C6400_PLL_MDIV_MASK;
31
pdiv = (pllcon >> S3C6400_PLL_PDIV_SHIFT) & S3C6400_PLL_PDIV_MASK;
32
sdiv = (pllcon >> S3C6400_PLL_SDIV_SHIFT) & S3C6400_PLL_SDIV_MASK;
35
do_div(fvco, (pdiv << sdiv));
37
return (unsigned long)fvco;
40
#define S3C6400_EPLL_MDIV_MASK ((1 << (23-16)) - 1)
41
#define S3C6400_EPLL_PDIV_MASK ((1 << (13-8)) - 1)
42
#define S3C6400_EPLL_SDIV_MASK ((1 << (2-0)) - 1)
43
#define S3C6400_EPLL_MDIV_SHIFT (16)
44
#define S3C6400_EPLL_PDIV_SHIFT (8)
45
#define S3C6400_EPLL_SDIV_SHIFT (0)
46
#define S3C6400_EPLL_KDIV_MASK (0xffff)
48
static inline unsigned long s3c6400_get_epll(unsigned long baseclk)
51
u32 epll0 = __raw_readl(S3C_EPLL_CON0);
52
u32 epll1 = __raw_readl(S3C_EPLL_CON1);
53
u32 mdiv, pdiv, sdiv, kdiv;
56
mdiv = (epll0 >> S3C6400_EPLL_MDIV_SHIFT) & S3C6400_EPLL_MDIV_MASK;
57
pdiv = (epll0 >> S3C6400_EPLL_PDIV_SHIFT) & S3C6400_EPLL_PDIV_MASK;
58
sdiv = (epll0 >> S3C6400_EPLL_SDIV_SHIFT) & S3C6400_EPLL_SDIV_MASK;
59
kdiv = epll1 & S3C6400_EPLL_KDIV_MASK;
61
/* We need to multiple baseclk by mdiv (the integer part) and kdiv
62
* which is in 2^16ths, so shift mdiv up (does not overflow) and
63
* add kdiv before multiplying. The use of tmp is to avoid any
64
* overflows before shifting bac down into result when multipling
65
* by the mdiv and kdiv pair.
69
tmp *= (mdiv << 16) + kdiv;
70
do_div(tmp, (pdiv << sdiv));