Commit f91f9cd5 authored by Oskar Schirmer's avatar Oskar Schirmer Committed by Thomas Gleixner
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arm: tcc8k: Fix bus clock calculation

There are two dividers used to derive bus clock from system clock:
system clock is divided by SCKDIV+1, then by BCKDIV+1. SCKDIV divider
has been ignored up to now, which is no problem as long as it is 0.

Take SCKDIV into account for bus clock calculation.
Signed-off-by: default avatarOskar Schirmer <>
Signed-off-by: default avatarThomas Gleixner <>
parent cfeeb2f9
......@@ -308,10 +308,17 @@ static unsigned long get_rate_sys(struct clk *clk)
static unsigned long get_rate_bus(struct clk *clk)
unsigned int div;
unsigned int reg, sdiv, bdiv, rate;
div = (__raw_readl(CKC_BASE + CLKCTRL_OFFS) >> 4) & 0xff;
return get_rate_sys(clk) / (div + 1);
reg = __raw_readl(CKC_BASE + CLKCTRL_OFFS);
rate = get_rate_sys(clk);
sdiv = (reg >> 20) & 3;
if (sdiv)
rate /= sdiv + 1;
bdiv = (reg >> 4) & 0xff;
if (bdiv)
rate /= bdiv + 1;
return rate;
static unsigned long get_rate_cpu(struct clk *clk)
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