112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
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i2c-vid.h - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
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With assistance from Trent Piepho <xyzzy@speakeasy.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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This file contains common code for decoding VID pins.
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This file is #included in various chip drivers in this directory.
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As the user is unlikely to load more than one driver which
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includes this code we don't worry about the wasted space.
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Reference: VRM x.y DC-DC Converter Design Guidelines,
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available at http://developer.intel.com
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*/
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/*
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AMD Opteron processors don't follow the Intel VRM spec.
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I'm going to "make up" 2.4 as the VRM spec for the Opterons.
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No good reason just a mnemonic for the 24x Opteron processor
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series
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Opteron VID encoding is:
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00000 = 1.550 V
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00001 = 1.525 V
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. . . .
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11110 = 0.800 V
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11111 = 0.000 V (off)
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*/
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/*
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Legal val values 0x00 - 0x1f; except for VRD 10.0, 0x00 - 0x3f.
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vrm is the Intel VRM document version.
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Note: vrm version is scaled by 10 and the return value is scaled by 1000
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to avoid floating point in the kernel.
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*/
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int i2c_which_vrm(void);
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#define DEFAULT_VRM 82
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static inline int vid_from_reg(int val, int vrm)
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{
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int vid;
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switch(vrm) {
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case 0:
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return 0;
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case 100: /* VRD 10.0 */
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if((val & 0x1f) == 0x1f)
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return 0;
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if((val & 0x1f) <= 0x09 || val == 0x0a)
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vid = 10875 - (val & 0x1f) * 250;
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else
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vid = 18625 - (val & 0x1f) * 250;
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if(val & 0x20)
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vid -= 125;
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vid /= 10; /* only return 3 dec. places for now */
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return vid;
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case 24: /* Opteron processor */
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return(val == 0x1f ? 0 : 1550 - val * 25);
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case 91: /* VRM 9.1 */
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case 90: /* VRM 9.0 */
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return(val == 0x1f ? 0 :
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1850 - val * 25);
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case 85: /* VRM 8.5 */
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return((val & 0x10 ? 25 : 0) +
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((val & 0x0f) > 0x04 ? 2050 : 1250) -
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((val & 0x0f) * 50));
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case 84: /* VRM 8.4 */
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val &= 0x0f;
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/* fall through */
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default: /* VRM 8.2 */
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return(val == 0x1f ? 0 :
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val & 0x10 ? 5100 - (val) * 100 :
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2050 - (val) * 50);
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}
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}
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static inline int vid_to_reg(int val, int vrm)
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{
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switch (vrm) {
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case 91: /* VRM 9.1 */
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case 90: /* VRM 9.0 */
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return ((val >= 1100) && (val <= 1850) ?
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((18499 - val * 10) / 25 + 5) / 10 : -1);
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default:
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return -1;
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}
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}
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