75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
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/* arch/arm/plat-s3c64xx/include/plat/pll.h
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*
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* Copyright 2008 Openmoko, Inc.
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* Copyright 2008 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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*
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* S3C64XX PLL code
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define S3C6400_PLL_MDIV_MASK ((1 << (25-16)) - 1)
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#define S3C6400_PLL_PDIV_MASK ((1 << (13-8)) - 1)
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#define S3C6400_PLL_SDIV_MASK ((1 << (2-0)) - 1)
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#define S3C6400_PLL_MDIV_SHIFT (16)
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#define S3C6400_PLL_PDIV_SHIFT (8)
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#define S3C6400_PLL_SDIV_SHIFT (0)
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#include <asm/div64.h>
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static inline unsigned long s3c6400_get_pll(unsigned long baseclk,
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u32 pllcon)
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{
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u32 mdiv, pdiv, sdiv;
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u64 fvco = baseclk;
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mdiv = (pllcon >> S3C6400_PLL_MDIV_SHIFT) & S3C6400_PLL_MDIV_MASK;
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pdiv = (pllcon >> S3C6400_PLL_PDIV_SHIFT) & S3C6400_PLL_PDIV_MASK;
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sdiv = (pllcon >> S3C6400_PLL_SDIV_SHIFT) & S3C6400_PLL_SDIV_MASK;
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fvco *= mdiv;
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do_div(fvco, (pdiv << sdiv));
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return (unsigned long)fvco;
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}
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#define S3C6400_EPLL_MDIV_MASK ((1 << (23-16)) - 1)
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#define S3C6400_EPLL_PDIV_MASK ((1 << (13-8)) - 1)
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#define S3C6400_EPLL_SDIV_MASK ((1 << (2-0)) - 1)
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#define S3C6400_EPLL_MDIV_SHIFT (16)
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#define S3C6400_EPLL_PDIV_SHIFT (8)
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#define S3C6400_EPLL_SDIV_SHIFT (0)
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#define S3C6400_EPLL_KDIV_MASK (0xffff)
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static inline unsigned long s3c6400_get_epll(unsigned long baseclk)
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{
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unsigned long result;
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u32 epll0 = __raw_readl(S3C_EPLL_CON0);
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u32 epll1 = __raw_readl(S3C_EPLL_CON1);
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u32 mdiv, pdiv, sdiv, kdiv;
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u64 tmp;
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mdiv = (epll0 >> S3C6400_EPLL_MDIV_SHIFT) & S3C6400_EPLL_MDIV_MASK;
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pdiv = (epll0 >> S3C6400_EPLL_PDIV_SHIFT) & S3C6400_EPLL_PDIV_MASK;
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sdiv = (epll0 >> S3C6400_EPLL_SDIV_SHIFT) & S3C6400_EPLL_SDIV_MASK;
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kdiv = epll1 & S3C6400_EPLL_KDIV_MASK;
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/* We need to multiple baseclk by mdiv (the integer part) and kdiv
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* which is in 2^16ths, so shift mdiv up (does not overflow) and
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* add kdiv before multiplying. The use of tmp is to avoid any
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* overflows before shifting bac down into result when multipling
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* by the mdiv and kdiv pair.
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*/
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tmp = baseclk;
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tmp *= (mdiv << 16) + kdiv;
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do_div(tmp, (pdiv << sdiv));
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result = tmp >> 16;
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return result;
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}
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