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/*
* Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/addrspace.h>
#include <asm/types.h>
#include <mach/ar71xx_regs.h>
#include <mach/reset.h>
DECLARE_GLOBAL_DATA_PTR;
static u32 ar933x_get_xtal(void)
{
u32 val;
val = get_bootstrap();
if (val & AR933X_BOOTSTRAP_REF_CLK_40)
return 40000000;
else
return 25000000;
}
int get_serial_clock(void)
{
return ar933x_get_xtal();
}
int get_clocks(void)
{
void __iomem *regs;
u32 val, xtal, pll, div;
regs = map_physmem(AR71XX_PLL_BASE, AR71XX_PLL_SIZE,
MAP_NOCACHE);
xtal = ar933x_get_xtal();
val = readl(regs + AR933X_PLL_CPU_CONFIG_REG);
/* VCOOUT = XTAL * DIV_INT */
div = (val >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT)
& AR933X_PLL_CPU_CONFIG_REFDIV_MASK;
pll = xtal / div;
/* PLLOUT = VCOOUT * (1/2^OUTDIV) */
div = (val >> AR933X_PLL_CPU_CONFIG_NINT_SHIFT)
& AR933X_PLL_CPU_CONFIG_NINT_MASK;
pll *= div;
div = (val >> AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT)
& AR933X_PLL_CPU_CONFIG_OUTDIV_MASK;
if (!div)
div = 1;
pll >>= div;
val = readl(regs + AR933X_PLL_CLK_CTRL_REG);
/* CPU_CLK = PLLOUT / CPU_POST_DIV */
div = ((val >> AR933X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT)
& AR933X_PLL_CLK_CTRL_CPU_POST_DIV_MASK) + 1;
gd->cpu_clk = pll / div;
/* DDR_CLK = PLLOUT / DDR_POST_DIV */
div = ((val >> AR933X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT)
& AR933X_PLL_CLK_CTRL_DDR_POST_DIV_MASK) + 1;
gd->mem_clk = pll / div;
/* AHB_CLK = PLLOUT / AHB_POST_DIV */
div = ((val >> AR933X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT)
& AR933X_PLL_CLK_CTRL_AHB_POST_DIV_MASK) + 1;
gd->bus_clk = pll / div;
return 0;
}
ulong get_bus_freq(ulong dummy)
{
if (!gd->bus_clk)
get_clocks();
return gd->bus_clk;
}
ulong get_ddr_freq(ulong dummy)
{
if (!gd->mem_clk)
get_clocks();
return gd->mem_clk;
}
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