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