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thermal: rcar_gen3_thermal: Read calibration from hardware

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In production hardware the calibration values used to convert register
values to temperatures can be read from hardware. While pre-production
hardware still depends on pseudo values hard-coded in the driver.

Add support for reading out calibration values from hardware if it's
fused. The presence of fused calibration is indicated in the THSCP
register.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20211014103816.1939782-3-niklas.soderlund+renesas@ragnatech.se
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Niklas Söderlund 2021-10-14 12:38:16 +02:00 committed by Daniel Lezcano
parent b8aaf1415a
commit c3131bd558
1 changed files with 74 additions and 20 deletions
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94
drivers/thermal/rcar_gen3_thermal.c
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@ -34,6 +34,10 @@
#define REG_GEN3_THCODE1 0x50
#define REG_GEN3_THCODE2 0x54
#define REG_GEN3_THCODE3 0x58
#define REG_GEN3_PTAT1 0x5c
#define REG_GEN3_PTAT2 0x60
#define REG_GEN3_PTAT3 0x64
#define REG_GEN3_THSCP 0x68
/* IRQ{STR,MSK,EN} bits */
#define IRQ_TEMP1 BIT(0)
@ -55,6 +59,9 @@
#define THCTR_PONM BIT(6)
#define THCTR_THSST BIT(0)
/* THSCP bits */
#define THSCP_COR_PARA_VLD (BIT(15) | BIT(14))
#define CTEMP_MASK 0xFFF
#define MCELSIUS(temp) ((temp) * 1000)
@ -245,6 +252,64 @@ static const struct soc_device_attribute r8a7795es1[] = {
{ /* sentinel */ }
};
static bool rcar_gen3_thermal_read_fuses(struct rcar_gen3_thermal_priv *priv)
{
unsigned int i;
u32 thscp;
/* If fuses are not set, fallback to pseudo values. */
thscp = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_THSCP);
if ((thscp & THSCP_COR_PARA_VLD) != THSCP_COR_PARA_VLD) {
/* Default THCODE values in case FUSEs are not set. */
static const int thcodes[TSC_MAX_NUM][3] = {
{ 3397, 2800, 2221 },
{ 3393, 2795, 2216 },
{ 3389, 2805, 2237 },
{ 3415, 2694, 2195 },
{ 3356, 2724, 2244 },
};
priv->ptat[0] = 2631;
priv->ptat[1] = 1509;
priv->ptat[2] = 435;
for (i = 0; i < priv->num_tscs; i++) {
struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
tsc->thcode[0] = thcodes[i][0];
tsc->thcode[1] = thcodes[i][1];
tsc->thcode[2] = thcodes[i][2];
}
return false;
}
/*
* Set the pseudo calibration points with fused values.
* PTAT is shared between all TSCs but only fused for the first
* TSC while THCODEs are fused for each TSC.
*/
priv->ptat[0] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT1) &
GEN3_FUSE_MASK;
priv->ptat[1] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT2) &
GEN3_FUSE_MASK;
priv->ptat[2] = rcar_gen3_thermal_read(priv->tscs[0], REG_GEN3_PTAT3) &
GEN3_FUSE_MASK;
for (i = 0; i < priv->num_tscs; i++) {
struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
tsc->thcode[0] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE1) &
GEN3_FUSE_MASK;
tsc->thcode[1] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE2) &
GEN3_FUSE_MASK;
tsc->thcode[2] = rcar_gen3_thermal_read(tsc, REG_GEN3_THCODE3) &
GEN3_FUSE_MASK;
}
return true;
}
static void rcar_gen3_thermal_init_r8a7795es1(struct rcar_gen3_thermal_tsc *tsc)
{
rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_THBGR);
@ -393,16 +458,6 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
unsigned int i;
int ret;
/* Default THCODE values in case FUSEs are not set. */
/* TODO: Read values from hardware on supported platforms */
static const int thcodes[TSC_MAX_NUM][3] = {
{ 3397, 2800, 2221 },
{ 3393, 2795, 2216 },
{ 3389, 2805, 2237 },
{ 3415, 2694, 2195 },
{ 3356, 2724, 2244 },
};
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@ -411,10 +466,6 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
if (soc_device_match(r8a7795es1))
priv->thermal_init = rcar_gen3_thermal_init_r8a7795es1;
priv->ptat[0] = 2631;
priv->ptat[1] = 1509;
priv->ptat[2] = 435;
platform_set_drvdata(pdev, priv);
if (rcar_gen3_thermal_request_irqs(priv, pdev))
@ -442,11 +493,16 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
goto error_unregister;
}
tsc->thcode[0] = thcodes[i][0];
tsc->thcode[1] = thcodes[i][1];
tsc->thcode[2] = thcodes[i][2];
priv->tscs[i] = tsc;
}
priv->num_tscs = i;
if (!rcar_gen3_thermal_read_fuses(priv))
dev_info(dev, "No calibration values fused, fallback to driver values\n");
for (i = 0; i < priv->num_tscs; i++) {
struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
&rcar_gen3_tz_of_ops);
@ -476,8 +532,6 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
dev_info(dev, "TSC%u: Loaded %d trip points\n", i, ret);
}
priv->num_tscs = i;
if (!priv->num_tscs) {
ret = -ENODEV;
goto error_unregister;