100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
|
/*
|
||
|
|
i2c-vid.h - Part of lm_sensors, Linux kernel modules for hardware
|
||
|
|
monitoring
|
||
|
|
Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
|
||
|
|
With assistance from Trent Piepho <xyzzy@speakeasy.org>
|
||
|
|
|
||
|
|
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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
This file contains common code for decoding VID pins.
|
||
|
|
This file is #included in various chip drivers in this directory.
|
||
|
|
As the user is unlikely to load more than one driver which
|
||
|
|
includes this code we don't worry about the wasted space.
|
||
|
|
Reference: VRM x.y DC-DC Converter Design Guidelines,
|
||
|
|
available at http://developer.intel.com
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
AMD Opteron processors don't follow the Intel VRM spec.
|
||
|
|
I'm going to "make up" 2.4 as the VRM spec for the Opterons.
|
||
|
|
No good reason just a mnemonic for the 24x Opteron processor
|
||
|
|
series
|
||
|
|
|
||
|
|
Opteron VID encoding is:
|
||
|
|
|
||
|
|
00000 = 1.550 V
|
||
|
|
00001 = 1.525 V
|
||
|
|
. . . .
|
||
|
|
11110 = 0.800 V
|
||
|
|
11111 = 0.000 V (off)
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
Legal val values 0x00 - 0x1f; except for VRD 10.0, 0x00 - 0x3f.
|
||
|
|
vrm is the Intel VRM document version.
|
||
|
|
Note: vrm version is scaled by 10 and the return value is scaled by 1000
|
||
|
|
to avoid floating point in the kernel.
|
||
|
|
*/
|
||
|
|
|
||
|
|
int i2c_which_vrm(void);
|
||
|
|
|
||
|
|
#define DEFAULT_VRM 82
|
||
|
|
|
||
|
|
static inline int vid_from_reg(int val, int vrm)
|
||
|
|
{
|
||
|
|
int vid;
|
||
|
|
|
||
|
|
switch(vrm) {
|
||
|
|
|
||
|
|
case 0:
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
case 100: /* VRD 10.0 */
|
||
|
|
if((val & 0x1f) == 0x1f)
|
||
|
|
return 0;
|
||
|
|
if((val & 0x1f) <= 0x09 || val == 0x0a)
|
||
|
|
vid = 10875 - (val & 0x1f) * 250;
|
||
|
|
else
|
||
|
|
vid = 18625 - (val & 0x1f) * 250;
|
||
|
|
if(val & 0x20)
|
||
|
|
vid -= 125;
|
||
|
|
vid /= 10; /* only return 3 dec. places for now */
|
||
|
|
return vid;
|
||
|
|
|
||
|
|
case 24: /* Opteron processor */
|
||
|
|
return(val == 0x1f ? 0 : 1550 - val * 25);
|
||
|
|
|
||
|
|
case 91: /* VRM 9.1 */
|
||
|
|
case 90: /* VRM 9.0 */
|
||
|
|
return(val == 0x1f ? 0 :
|
||
|
|
1850 - val * 25);
|
||
|
|
|
||
|
|
case 85: /* VRM 8.5 */
|
||
|
|
return((val & 0x10 ? 25 : 0) +
|
||
|
|
((val & 0x0f) > 0x04 ? 2050 : 1250) -
|
||
|
|
((val & 0x0f) * 50));
|
||
|
|
|
||
|
|
case 84: /* VRM 8.4 */
|
||
|
|
val &= 0x0f;
|
||
|
|
/* fall through */
|
||
|
|
default: /* VRM 8.2 */
|
||
|
|
return(val == 0x1f ? 0 :
|
||
|
|
val & 0x10 ? 5100 - (val) * 100 :
|
||
|
|
2050 - (val) * 50);
|
||
|
|
}
|
||
|
|
}
|