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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: Oskar Schirmer <oskar@linutronix.de>
Cc: bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Oskar Schirmer 2011-02-17 16:43:02 +01:00 committed by Thomas Gleixner
parent cfeeb2f998
commit f91f9cd505
1 changed files with 10 additions and 3 deletions
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13
arch/arm/mach-tcc8k/clock.c
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@ -308,10 +308,17 @@ static unsigned long get_rate_sys(struct clk *clk)
static unsigned long get_rate_bus(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; reg = __raw_readl(CKC_BASE + CLKCTRL_OFFS);
return get_rate_sys(clk) / (div + 1); 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) static unsigned long get_rate_cpu(struct clk *clk)