blob: 929f0f5822b4bf0aa1a9d7dc0cdb965ae940a70a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*
*
* (c) 2004 Sascha Hauer <sascha@saschahauer.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <asm-generic/div64.h>
/*
* get the system pll clock in Hz
*
* mfi + mfn / (mfd +1)
* f = 2 * f_ref * --------------------
* pd + 1
*/
unsigned int imx_decode_pll(unsigned int pll, unsigned int f_ref)
{
unsigned long long ll;
unsigned int quot;
unsigned int mfi = (pll >> 10) & 0xf;
unsigned int mfn = pll & 0x3ff;
unsigned int mfd = (pll >> 16) & 0x3ff;
unsigned int pd = (pll >> 26) & 0xf;
mfi = mfi <= 5 ? 5 : mfi;
ll = 2 * (unsigned long long)f_ref * ( (mfi << 16) + (mfn << 16) / (mfd + 1));
quot = (pd + 1) * (1 << 16);
ll += quot / 2;
do_div(ll, quot);
return (unsigned int) ll;
}
|