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thermal: rcar: enable CPCTL to use hardware TSC deciding

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If CPCTL was 1 on R-Car thermal, the thermal comparator offset
is automatically decided by hardware.
And this CPCTL is the conditions which validate interrupt.
This patch enabled CPCTL.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Kuninori Morimoto 2013-01-31 09:03:11 +00:00 committed by Zhang Rui
parent 9dde8f8608
commit f8f53e1874
1 changed files with 24 additions and 63 deletions
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87
drivers/thermal/rcar_thermal.c
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@ -33,7 +33,7 @@
#define THSSR 0x30
/* THSCR */
#define CPTAP 0xf
#define CPCTL (1 << 12)
/* THSSR */
#define CTEMP 0x3f
@ -43,11 +43,11 @@ struct rcar_thermal_priv {
void __iomem *base;
struct device *dev;
spinlock_t lock;
u32 comp;
};
#define MCELSIUS(temp) ((temp) * 1000)
#define rcar_zone_to_priv(zone) ((zone)->devdata)
#define rcar_priv_to_dev(priv) ((priv)->dev)
/*
* basic functions
@ -103,79 +103,41 @@ static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
unsigned long *temp)
{
struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
int val, min, max, tmp;
struct device *dev = rcar_priv_to_dev(priv);
int i;
int ctemp, old, new;
tmp = -200; /* default */
while (1) {
if (priv->comp < 1 || priv->comp > 12) {
dev_err(priv->dev,
"THSSR invalid data (%d)\n", priv->comp);
priv->comp = 4; /* for next thermal */
return -EINVAL;
}
/*
* THS comparator offset and the reference temperature
*
* Comparator | reference | Temperature field
* offset | temperature | measurement
* | (degrees C) | (degrees C)
* -------------+---------------+-------------------
* 1 | -45 | -45 to -30
* 2 | -30 | -30 to -15
* 3 | -15 | -15 to 0
* 4 | 0 | 0 to +15
* 5 | +15 | +15 to +30
* 6 | +30 | +30 to +45
* 7 | +45 | +45 to +60
* 8 | +60 | +60 to +75
* 9 | +75 | +75 to +90
* 10 | +90 | +90 to +105
* 11 | +105 | +105 to +120
* 12 | +120 | +120 to +135
*/
/* calculate thermal limitation */
min = (priv->comp * 15) - 60;
max = min + 15;
/*
* TSC decides a value of CPTAP automatically,
* and this is the conditions which validate interrupt.
*/
rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
ctemp = 0;
old = ~0;
for (i = 0; i < 128; i++) {
/*
* we need to wait 300us after changing comparator offset
* to get stable temperature.
* see "Usage Notes" on datasheet
*/
rcar_thermal_bset(priv, THSCR, CPTAP, priv->comp);
udelay(300);
/* calculate current temperature */
val = rcar_thermal_read(priv, THSSR) & CTEMP;
val = (val * 5) - 65;
dev_dbg(priv->dev, "comp/min/max/val = %d/%d/%d/%d\n",
priv->comp, min, max, val);
/*
* If val is same as min/max, then,
* it should try again on next comparator.
* But the val might be correct temperature.
* Keep it on "tmp" and compare with next val.
*/
if (tmp == val)
break;
if (val <= min) {
tmp = min;
priv->comp--; /* try again */
} else if (val >= max) {
tmp = max;
priv->comp++; /* try again */
} else {
tmp = val;
new = rcar_thermal_read(priv, THSSR) & CTEMP;
if (new == old) {
ctemp = new;
break;
}
old = new;
}
*temp = MCELSIUS(tmp);
if (!ctemp) {
dev_err(dev, "thermal sensor was broken\n");
return -EINVAL;
}
*temp = MCELSIUS((ctemp * 5) - 65);
return 0;
}
@ -262,7 +224,6 @@ static int rcar_thermal_probe(struct platform_device *pdev)
return -ENOMEM;
}
priv->comp = 4; /* basic setup */
priv->dev = &pdev->dev;
spin_lock_init(&priv->lock);
priv->base = devm_ioremap_nocache(&pdev->dev,