therm.c

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/*
 * Copyright 2012 Nouveau Community
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Martin Peres
 */

#include <subdev/bios.h>
#include <subdev/bios/bit.h>
#include <subdev/bios/therm.h>

static u16
therm_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
{
    struct bit_entry bit_P;
    u16 therm = 0;

    if (!bit_entry(bios, 'P', &bit_P)) {
        if (bit_P.version == 1)
            therm = nv_ro16(bios, bit_P.offset + 12);
        else if (bit_P.version == 2)
            therm = nv_ro16(bios, bit_P.offset + 16);
        else
            nv_error(bios,
                "unknown offset for thermal in BIT P %d\n",
                bit_P.version);
    }

    /* exit now if we haven't found the thermal table */
    if (!therm)
        return 0x0000;

    *ver = nv_ro08(bios, therm + 0);
    *hdr = nv_ro08(bios, therm + 1);
    *len = nv_ro08(bios, therm + 2);
    *cnt = nv_ro08(bios, therm + 3);

    return therm + nv_ro08(bios, therm + 1);
}

u16
nvbios_therm_entry(struct nouveau_bios *bios, int idx, u8 *ver, u8 *len)
{
    u8 hdr, cnt;
    u16 therm = therm_table(bios, ver, &hdr, len, &cnt);
    if (therm && idx < cnt)
        return therm + idx * *len;
    return 0x0000;
}

int
nvbios_therm_sensor_parse(struct nouveau_bios *bios,
              enum nvbios_therm_domain domain,
              struct nvbios_therm_sensor *sensor)
{
    s8 thrs_section, sensor_section, offset;
    u8 ver, len, i;
    u16 entry;

    /* we only support the core domain for now */
    if (domain != NVBIOS_THERM_DOMAIN_CORE)
        return -EINVAL;

    /* Read the entries from the table */
    thrs_section = 0;
    sensor_section = -1;
    i = 0;
    while ((entry = nvbios_therm_entry(bios, i++, &ver, &len))) {
        s16 value = nv_ro16(bios, entry + 1);

        switch (nv_ro08(bios, entry + 0)) {
        case 0x0:
            thrs_section = value;
            if (value > 0)
                return 0; /* we do not try to support ambient */
            break;
        case 0x01:
            sensor_section++;
            if (sensor_section == 0) {
                offset = ((s8) nv_ro08(bios, entry + 2)) / 2;
                sensor->offset_constant = offset;
            }
            break;

        case 0x04:
            if (thrs_section == 0) {
                sensor->thrs_critical.temp = (value & 0xff0) >> 4;
                sensor->thrs_critical.hysteresis = value & 0xf;
            }
            break;

        case 0x07:
            if (thrs_section == 0) {
                sensor->thrs_down_clock.temp = (value & 0xff0) >> 4;
                sensor->thrs_down_clock.hysteresis = value & 0xf;
            }
            break;

        case 0x08:
            if (thrs_section == 0) {
                sensor->thrs_fan_boost.temp = (value & 0xff0) >> 4;
                sensor->thrs_fan_boost.hysteresis = value & 0xf;
            }
            break;

        case 0x10:
            if (sensor_section == 0)
                sensor->offset_num = value;
            break;

        case 0x11:
            if (sensor_section == 0)
                sensor->offset_den = value;
            break;

        case 0x12:
            if (sensor_section == 0)
                sensor->slope_mult = value;
            break;

        case 0x13:
            if (sensor_section == 0)
                sensor->slope_div = value;
            break;
        case 0x32:
            if (thrs_section == 0) {
                sensor->thrs_shutdown.temp = (value & 0xff0) >> 4;
                sensor->thrs_shutdown.hysteresis = value & 0xf;
            }
            break;
        }
    }

    return 0;
}

int
nvbios_therm_fan_parse(struct nouveau_bios *bios,
              struct nvbios_therm_fan *fan)
{
    u8 ver, len, i;
    u16 entry;

    i = 0;
    while ((entry = nvbios_therm_entry(bios, i++, &ver, &len))) {
        s16 value = nv_ro16(bios, entry + 1);

        switch (nv_ro08(bios, entry + 0)) {
        case 0x22:
            fan->min_duty = value & 0xff;
            fan->max_duty = (value & 0xff00) >> 8;
            break;
        case 0x26:
            fan->pwm_freq = value;
            break;
        }
    }

    return 0;
}