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/*
* Keystone2: get clk rate for K2L
*
* (C) Copyright 2012-2014
* Texas Instruments Incorporated, <www.ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/clock_defs.h>
/**
* pll_freq_get - get pll frequency
* Fout = Fref * NF(mult) / NR(prediv) / OD
* @pll: pll identifier
*/
static unsigned long pll_freq_get(int pll)
{
unsigned long mult = 1, prediv = 1, output_div = 2;
unsigned long ret;
u32 tmp, reg;
if (pll == CORE_PLL) {
ret = external_clk[sys_clk];
if (pllctl_reg_read(pll, ctl) & PLLCTL_PLLEN) {
/* PLL mode */
tmp = __raw_readl(KS2_MAINPLLCTL0);
prediv = (tmp & PLL_DIV_MASK) + 1;
mult = (((tmp & PLLM_MULT_HI_SMASK) >> 6) |
(pllctl_reg_read(pll, mult) &
PLLM_MULT_LO_MASK)) + 1;
output_div = ((pllctl_reg_read(pll, secctl) >>
PLL_CLKOD_SHIFT) & PLL_CLKOD_MASK) + 1;
ret = ret / prediv / output_div * mult;
}
} else {
switch (pll) {
case PASS_PLL:
ret = external_clk[pa_clk];
reg = KS2_PASSPLLCTL0;
break;
case TETRIS_PLL:
ret = external_clk[tetris_clk];
reg = KS2_ARMPLLCTL0;
break;
case DDR3_PLL:
ret = external_clk[ddr3a_clk];
reg = KS2_DDR3APLLCTL0;
break;
default:
return 0;
}
tmp = __raw_readl(reg);
if (!(tmp & PLLCTL_BYPASS)) {
/* Bypass disabled */
prediv = (tmp & PLL_DIV_MASK) + 1;
mult = ((tmp >> PLL_MULT_SHIFT) & PLL_MULT_MASK) + 1;
output_div = ((tmp >> PLL_CLKOD_SHIFT) &
PLL_CLKOD_MASK) + 1;
ret = ((ret / prediv) * mult) / output_div;
}
}
return ret;
}
unsigned long clk_get_rate(unsigned int clk)
{
switch (clk) {
case core_pll_clk: return pll_freq_get(CORE_PLL);
case pass_pll_clk: return pll_freq_get(PASS_PLL);
case tetris_pll_clk: return pll_freq_get(TETRIS_PLL);
case ddr3_pll_clk: return pll_freq_get(DDR3_PLL);
case sys_clk0_1_clk:
case sys_clk0_clk: return pll_freq_get(CORE_PLL) / pll0div_read(1);
case sys_clk1_clk: return pll_freq_get(CORE_PLL) / pll0div_read(2);
case sys_clk2_clk: return pll_freq_get(CORE_PLL) / pll0div_read(3);
case sys_clk3_clk: return pll_freq_get(CORE_PLL) / pll0div_read(4);
case sys_clk0_2_clk: return clk_get_rate(sys_clk0_clk) / 2;
case sys_clk0_3_clk: return clk_get_rate(sys_clk0_clk) / 3;
case sys_clk0_4_clk: return clk_get_rate(sys_clk0_clk) / 4;
case sys_clk0_6_clk: return clk_get_rate(sys_clk0_clk) / 6;
case sys_clk0_8_clk: return clk_get_rate(sys_clk0_clk) / 8;
case sys_clk0_12_clk: return clk_get_rate(sys_clk0_clk) / 12;
case sys_clk0_24_clk: return clk_get_rate(sys_clk0_clk) / 24;
case sys_clk1_3_clk: return clk_get_rate(sys_clk1_clk) / 3;
case sys_clk1_4_clk: return clk_get_rate(sys_clk1_clk) / 4;
case sys_clk1_6_clk: return clk_get_rate(sys_clk1_clk) / 6;
case sys_clk1_12_clk: return clk_get_rate(sys_clk1_clk) / 12;
default:
break;
}
return 0;
}
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