u-boot/drivers/clk/exynos/clk-pll.c

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/*
* Exynos PLL helper functions for clock drivers.
* Copyright (C) 2016 Samsung Electronics
* Thomas Abraham <thomas.ab@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <div64.h>
#define PLL145X_MDIV_SHIFT 16
#define PLL145X_MDIV_MASK 0x3ff
#define PLL145X_PDIV_SHIFT 8
#define PLL145X_PDIV_MASK 0x3f
#define PLL145X_SDIV_SHIFT 0
#define PLL145X_SDIV_MASK 0x7
unsigned long pll145x_get_rate(unsigned int *con1, unsigned long fin_freq)
{
unsigned long pll_con1 = readl(con1);
unsigned long mdiv, sdiv, pdiv;
uint64_t fvco = fin_freq;
mdiv = (pll_con1 >> PLL145X_MDIV_SHIFT) & PLL145X_MDIV_MASK;
pdiv = (pll_con1 >> PLL145X_PDIV_SHIFT) & PLL145X_PDIV_MASK;
sdiv = (pll_con1 >> PLL145X_SDIV_SHIFT) & PLL145X_SDIV_MASK;
fvco *= mdiv;
do_div(fvco, (pdiv << sdiv));
return (unsigned long)fvco;
}