mirror of https://gitee.com/openkylin/linux.git
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* arch/arm/plat-samsung/include/plat/pll6553x.h
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* partially from arch/arm/mach-s3c64xx/include/mach/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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* Samsung PLL6553x 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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/* S3C6400 and compatible (S3C2416, etc.) EPLL code */
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#define PLL6553X_MDIV_MASK ((1 << (23-16)) - 1)
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#define PLL6553X_PDIV_MASK ((1 << (13-8)) - 1)
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#define PLL6553X_SDIV_MASK ((1 << (2-0)) - 1)
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#define PLL6553X_MDIV_SHIFT (16)
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#define PLL6553X_PDIV_SHIFT (8)
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#define PLL6553X_SDIV_SHIFT (0)
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#define PLL6553X_KDIV_MASK (0xffff)
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static inline unsigned long s3c_get_pll6553x(unsigned long baseclk,
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u32 pll0, u32 pll1)
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{
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unsigned long result;
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u32 mdiv, pdiv, sdiv, kdiv;
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u64 tmp;
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mdiv = (pll0 >> PLL6553X_MDIV_SHIFT) & PLL6553X_MDIV_MASK;
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pdiv = (pll0 >> PLL6553X_PDIV_SHIFT) & PLL6553X_PDIV_MASK;
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sdiv = (pll0 >> PLL6553X_SDIV_SHIFT) & PLL6553X_SDIV_MASK;
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kdiv = pll1 & PLL6553X_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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