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mx25: Clean up clock calculations 

Avoid possible overflow in clock calculations, and do not waste calls to lldiv()
to divide simple ulongs.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Benoît Thébaudeau 2012-09-27 10:27:14 +00:00 committed by Tom Rini
parent 3c76add262
commit fac7c817c3
1 changed files with 4 additions and 4 deletions
arch/arm/cpu/arm926ejs/mx25
generic.c

8
arch/arm/cpu/arm926ejs/mx25/generic.c
View File

@ -80,12 +80,12 @@ ulong imx_get_armclk(void)
ulong div;
if (cctl & CCM_CCTL_ARM_SRC)
fref = lldiv((fref * 3), 4);
fref = lldiv((u64) fref * 3, 4);
div = ((cctl >> CCM_CCTL_ARM_DIV_SHIFT)
& CCM_CCTL_ARM_DIV_MASK) + 1;
return lldiv(fref, div);
return fref / div;
}
ulong imx_get_ahbclk(void)
@ -98,7 +98,7 @@ ulong imx_get_ahbclk(void)
div = ((cctl >> CCM_CCTL_AHB_DIV_SHIFT)
& CCM_CCTL_AHB_DIV_MASK) + 1;
return lldiv(fref, div);
return fref / div;
}
ulong imx_get_perclk(int clk)
@ -110,7 +110,7 @@ ulong imx_get_perclk(int clk)
div = readl(&ccm->pcdr[CCM_PERCLK_REG(clk)]);
div = ((div >> CCM_PERCLK_SHIFT(clk)) & CCM_PERCLK_MASK) + 1;
return lldiv(fref, div);
return fref / div;
}
unsigned int mxc_get_clock(enum mxc_clock clk)