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MXC PLL decoding: calculate mfn value with less magic 

Also, use cpu_is_* macros rather than CONFIG_ARCH_*

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2009-06-03 11:22:32 +02:00
parent 5ef881bbec
commit 6d73665f05
1 changed files with 9 additions and 7 deletions
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16
arch/arm/plat-mxc/clock.c
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@ -39,6 +39,7 @@
#include <linux/string.h>
#include <mach/clock.h>
#include <mach/hardware.h>
static LIST_HEAD(clocks);
static DEFINE_MUTEX(clocks_mutex);
@ -363,12 +364,11 @@ unsigned long mxc_decode_pll(unsigned int reg_val, u32 freq)
mfn_abs = mfn;
#if !defined CONFIG_ARCH_MX1 && !defined CONFIG_ARCH_MX21
if (mfn >= 0x200) {
mfn |= 0xFFFFFE00;
mfn_abs = -mfn;
}
#endif
/* On all i.MXs except i.MX1 and i.MX21 mfn is a 10bit
* 2's complements number
*/
if (!cpu_is_mx1() && !cpu_is_mx21() && mfn >= 0x200)
mfn_abs = 0x400 - mfn;
freq *= 2;
freq /= pd + 1;
@ -376,8 +376,10 @@ unsigned long mxc_decode_pll(unsigned int reg_val, u32 freq)
ll = (unsigned long long)freq * mfn_abs;
do_div(ll, mfd + 1);
if (mfn < 0)
if (!cpu_is_mx1() && !cpu_is_mx21() && mfn >= 0x200)
ll = -ll;
ll = (freq * mfi) + ll;
return ll;