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thermal: brcmstb_thermal: Prepare to support a different process 

The driver is currently assuming that it is operating with a 28nm
process chip, which has a specific formula to convert temperature to a
code and vice versa. Update the code to support providing two key
values: offset and multiplier to derive the correct formulas.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200114190607.29339-3-f.fainelli@gmail.com
This commit is contained in:
Florian Fainelli 2020-01-14 11:06:03 -08:00 committed by Daniel Lezcano
parent e1ff6fc22f
commit 8bcda3257a
1 changed files with 33 additions and 14 deletions
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47
drivers/thermal/broadcom/brcmstb_thermal.c
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@ -102,18 +102,27 @@ static struct avs_tmon_trip avs_tmon_trips[] = {
},
};
struct brcmstb_thermal_params {
unsigned int offset;
unsigned int mult;
};
struct brcmstb_thermal_priv {
void __iomem *tmon_base;
struct device *dev;
struct thermal_zone_device *thermal;
/* Process specific thermal parameters used for calculations */
const struct brcmstb_thermal_params *temp_params;
};
/* Convert a HW code to a temperature reading (millidegree celsius) */
static inline int avs_tmon_code_to_temp(struct thermal_zone_device *tz,
static inline int avs_tmon_code_to_temp(struct brcmstb_thermal_priv *priv,
u32 code)
{
return (AVS_TMON_TEMP_OFFSET -
(int)((code & AVS_TMON_TEMP_MAX) * AVS_TMON_TEMP_SLOPE));
int offset = priv->temp_params->offset;
int mult = priv->temp_params->mult;
return (offset - (int)((code & AVS_TMON_TEMP_MASK) * mult));
}
/*
@ -122,21 +131,22 @@ static inline int avs_tmon_code_to_temp(struct thermal_zone_device *tz,
* @temp: temperature to convert
* @low: if true, round toward the low side
*/
static inline u32 avs_tmon_temp_to_code(struct thermal_zone_device *tz,
static inline u32 avs_tmon_temp_to_code(struct brcmstb_thermal_priv *priv,
int temp, bool low)
{
int offset = priv->temp_params->offset;
int mult = priv->temp_params->mult;
if (temp < AVS_TMON_TEMP_MIN)
return AVS_TMON_TEMP_MAX; /* Maximum code value */
if (temp >= AVS_TMON_TEMP_OFFSET)
if (temp >= offset)
return 0; /* Minimum code value */
if (low)
return (u32)(DIV_ROUND_UP(AVS_TMON_TEMP_OFFSET - temp,
AVS_TMON_TEMP_SLOPE));
return (u32)(DIV_ROUND_UP(offset - temp, mult));
else
return (u32)((AVS_TMON_TEMP_OFFSET - temp) /
AVS_TMON_TEMP_SLOPE);
return (u32)((offset - temp) / mult);
}
static int brcmstb_get_temp(void *data, int *temp)
@ -154,7 +164,7 @@ static int brcmstb_get_temp(void *data, int *temp)
val = (val & AVS_TMON_STATUS_data_msk) >> AVS_TMON_STATUS_data_shift;
t = avs_tmon_code_to_temp(priv->thermal, val);
t = avs_tmon_code_to_temp(priv, val);
if (t < 0)
*temp = 0;
else
@ -188,7 +198,7 @@ static int avs_tmon_get_trip_temp(struct brcmstb_thermal_priv *priv,
val &= trip->reg_msk;
val >>= trip->reg_shift;
return avs_tmon_code_to_temp(priv->thermal, val);
return avs_tmon_code_to_temp(priv, val);
}
static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
@ -201,7 +211,7 @@ static void avs_tmon_set_trip_temp(struct brcmstb_thermal_priv *priv,
dev_dbg(priv->dev, "set temp %d to %d\n", type, temp);
/* round toward low temp for the low interrupt */
val = avs_tmon_temp_to_code(priv->thermal, temp,
val = avs_tmon_temp_to_code(priv, temp,
type == TMON_TRIP_TYPE_LOW);
val <<= trip->reg_shift;
@ -218,7 +228,7 @@ static int avs_tmon_get_intr_temp(struct brcmstb_thermal_priv *priv)
u32 val;
val = __raw_readl(priv->tmon_base + AVS_TMON_TEMP_INT_CODE);
return avs_tmon_code_to_temp(priv->thermal, val);
return avs_tmon_code_to_temp(priv, val);
}
static irqreturn_t brcmstb_tmon_irq_thread(int irq, void *data)
@ -282,8 +292,13 @@ static const struct thermal_zone_of_device_ops of_ops = {
.set_trips = brcmstb_set_trips,
};
static const struct brcmstb_thermal_params brcmstb_28nm_params = {
.offset = 410040,
.mult = 487,
};
static const struct of_device_id brcmstb_thermal_id_table[] = {
{ .compatible = "brcm,avs-tmon" },
{ .compatible = "brcm,avs-tmon", .data = &brcmstb_28nm_params },
{},
};
MODULE_DEVICE_TABLE(of, brcmstb_thermal_id_table);
@ -299,6 +314,10 @@ static int brcmstb_thermal_probe(struct platform_device *pdev)
if (!priv)
return -ENOMEM;
priv->temp_params = of_device_get_match_data(&pdev->dev);
if (!priv->temp_params)
return -EINVAL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->tmon_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->tmon_base))