84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/* arch/arm/plat-s5p/include/plat/pll.h
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*
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* Copyright (c) 2009 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* S5P PLL code
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*
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* Based on arch/arm/plat-s3c64xx/include/plat/pll.h
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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 PLL45XX_MDIV_MASK (0x3FF)
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#define PLL45XX_PDIV_MASK (0x3F)
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#define PLL45XX_SDIV_MASK (0x7)
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#define PLL45XX_MDIV_SHIFT (16)
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#define PLL45XX_PDIV_SHIFT (8)
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#define PLL45XX_SDIV_SHIFT (0)
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#include <asm/div64.h>
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enum pll45xx_type_t {
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pll_4500,
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pll_4502,
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pll_4508
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};
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static inline unsigned long s5p_get_pll45xx(unsigned long baseclk, u32 pll_con,
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enum pll45xx_type_t pll_type)
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{
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u32 mdiv, pdiv, sdiv;
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u64 fvco = baseclk;
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mdiv = (pll_con >> PLL45XX_MDIV_SHIFT) & PLL45XX_MDIV_MASK;
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pdiv = (pll_con >> PLL45XX_PDIV_SHIFT) & PLL45XX_PDIV_MASK;
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sdiv = (pll_con >> PLL45XX_SDIV_SHIFT) & PLL45XX_SDIV_MASK;
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if (pll_type == pll_4508)
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sdiv = sdiv - 1;
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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 PLL90XX_MDIV_MASK (0xFF)
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#define PLL90XX_PDIV_MASK (0x3F)
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#define PLL90XX_SDIV_MASK (0x7)
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#define PLL90XX_KDIV_MASK (0xffff)
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#define PLL90XX_MDIV_SHIFT (16)
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#define PLL90XX_PDIV_SHIFT (8)
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#define PLL90XX_SDIV_SHIFT (0)
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#define PLL90XX_KDIV_SHIFT (0)
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static inline unsigned long s5p_get_pll90xx(unsigned long baseclk,
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u32 pll_con, u32 pll_conk)
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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 = (pll_con >> PLL90XX_MDIV_SHIFT) & PLL90XX_MDIV_MASK;
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pdiv = (pll_con >> PLL90XX_PDIV_SHIFT) & PLL90XX_PDIV_MASK;
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sdiv = (pll_con >> PLL90XX_SDIV_SHIFT) & PLL90XX_SDIV_MASK;
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kdiv = pll_conk & PLL90XX_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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