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drm/nv50/therm: implement temperature reading 

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Martin Peres 2013-02-23 17:15:18 +01:00 committed by Ben Skeggs
parent 2f4573679a
commit ba366c25bc
1 changed files with 39 additions and 3 deletions
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42
drivers/gpu/drm/nouveau/core/subdev/therm/nv50.c
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@ -118,10 +118,36 @@ nv50_fan_pwm_clock(struct nouveau_therm *therm)
return pwm_clock;
}
int
static void
nv50_sensor_setup(struct nouveau_therm *therm)
{
nv_mask(therm, 0x20010, 0x40000000, 0x0);
mdelay(20); /* wait for the temperature to stabilize */
}
static int
nv50_temp_get(struct nouveau_therm *therm)
{
return nv_rd32(therm, 0x20400);
struct nouveau_therm_priv *priv = (void *)therm;
struct nvbios_therm_sensor *sensor = &priv->bios_sensor;
int core_temp;
core_temp = nv_rd32(therm, 0x20014) & 0x3fff;
/* if the slope or the offset is unset, do no use the sensor */
if (!sensor->slope_div || !sensor->slope_mult ||
!sensor->offset_num || !sensor->offset_den)
return -ENODEV;
core_temp = core_temp * sensor->slope_mult / sensor->slope_div;
core_temp = core_temp + sensor->offset_num / sensor->offset_den;
core_temp = core_temp + sensor->offset_constant - 8;
/* reserve negative temperatures for errors */
if (core_temp < 0)
core_temp = 0;
return core_temp;
}
static int
@ -149,13 +175,23 @@ nv50_therm_ctor(struct nouveau_object *parent,
return nouveau_therm_preinit(&priv->base.base);
}
static int
nv50_therm_init(struct nouveau_object *object)
{
struct nouveau_therm *therm = (void *)object;
nv50_sensor_setup(therm);
return _nouveau_therm_init(object);
}
struct nouveau_oclass
nv50_therm_oclass = {
.handle = NV_SUBDEV(THERM, 0x50),
.ofuncs = &(struct nouveau_ofuncs) {
.ctor = nv50_therm_ctor,
.dtor = _nouveau_therm_dtor,
.init = _nouveau_therm_init,
.init = nv50_therm_init,
.fini = _nouveau_therm_fini,
},
};