cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fan.c (2704B)

      1/*
      2 * Copyright 2014 Martin Peres
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 * Authors: Martin Peres
     23 */
     24#include <subdev/bios.h>
     25#include <subdev/bios/bit.h>
     26#include <subdev/bios/fan.h>
     27
     28static u32
     29nvbios_fan_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
     30{
     31	struct bit_entry bit_P;
     32	u32 fan = 0;
     33
     34	if (!bit_entry(bios, 'P', &bit_P)) {
     35		if (bit_P.version == 2 && bit_P.length >= 0x5c)
     36			fan = nvbios_rd32(bios, bit_P.offset + 0x58);
     37
     38		if (fan) {
     39			*ver = nvbios_rd08(bios, fan + 0);
     40			switch (*ver) {
     41			case 0x10:
     42				*hdr = nvbios_rd08(bios, fan + 1);
     43				*len = nvbios_rd08(bios, fan + 2);
     44				*cnt = nvbios_rd08(bios, fan + 3);
     45				return fan;
     46			default:
     47				break;
     48			}
     49		}
     50	}
     51
     52	return 0;
     53}
     54
     55static u32
     56nvbios_fan_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
     57		 u8 *cnt, u8 *len)
     58{
     59	u32 data = nvbios_fan_table(bios, ver, hdr, cnt, len);
     60	if (data && idx < *cnt)
     61		return data + *hdr + (idx * (*len));
     62	return 0;
     63}
     64
     65u32
     66nvbios_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan)
     67{
     68	u8 ver, hdr, cnt, len;
     69
     70	u32 data = nvbios_fan_entry(bios, 0, &ver, &hdr, &cnt, &len);
     71	if (data) {
     72		u8 type = nvbios_rd08(bios, data + 0x00);
     73		switch (type) {
     74		case 0:
     75			fan->type = NVBIOS_THERM_FAN_TOGGLE;
     76			break;
     77		case 1:
     78		case 2:
     79			/* TODO: Understand the difference between the two! */
     80			fan->type = NVBIOS_THERM_FAN_PWM;
     81			break;
     82		default:
     83			fan->type = NVBIOS_THERM_FAN_UNK;
     84		}
     85
     86		fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
     87		fan->min_duty = nvbios_rd08(bios, data + 0x02);
     88		fan->max_duty = nvbios_rd08(bios, data + 0x03);
     89
     90		fan->pwm_freq = nvbios_rd32(bios, data + 0x0b) & 0xffffff;
     91	}
     92
     93	return data;
     94}