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Subject[PATCH v3 2/6] thermal: brcmstb_thermal: Prepare to support a different process
Date
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>
---
drivers/thermal/broadcom/brcmstb_thermal.c | 47 +++++++++++++++-------
1 file changed, 33 insertions(+), 14 deletions(-)

diff --git a/drivers/thermal/broadcom/brcmstb_thermal.c b/drivers/thermal/broadcom/brcmstb_thermal.c
index 680f1a070606..2d555e7b884a 100644
--- a/drivers/thermal/broadcom/brcmstb_thermal.c
+++ b/drivers/thermal/broadcom/brcmstb_thermal.c
@@ -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))
--
2.17.1
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