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authorAdrian Alonso <aalonso@freescale.com>2015-09-02 13:54:22 -0500
committerStefano Babic <sbabic@denx.de>2015-09-13 10:11:54 +0200
commitd1aa6f2d58f7f27a890d26d0a1f1fc14aa81f127 (patch)
treebb39e8cc8ff7fcb4ae1180f67cc40e160e6afbf2 /drivers
parent648539c906bb3b039b503b9b6325076eff4d9e5d (diff)
thermal: imx: add imx7d soc thermal support
Add imx7 SoC thermal driver support Signed-off-by: Adrian Alonso <aalonso@freescale.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/thermal/imx_thermal.c90
1 files changed, 84 insertions, 6 deletions
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index d90874e5ec..ca35be837b 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -25,6 +25,9 @@
#define FACTOR1 15976
#define FACTOR2 4297157
#define MEASURE_FREQ 327
+#define TEMPERATURE_MIN -40
+#define TEMPERATURE_HOT 85
+#define TEMPERATURE_MAX 125
#define TEMPSENSE0_TEMP_CNT_SHIFT 8
#define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
@@ -41,7 +44,8 @@ struct thermal_data {
int maxc;
};
-static int read_cpu_temperature_mx6(struct udevice *dev)
+#if defined(CONFIG_MX6)
+static int read_cpu_temperature(struct udevice *dev)
{
int temperature;
unsigned int reg, n_meas;
@@ -123,21 +127,87 @@ static int read_cpu_temperature_mx6(struct udevice *dev)
return temperature;
}
+#elif defined(CONFIG_MX7)
+static int read_cpu_temperature(struct udevice *dev)
+{
+ unsigned int reg, tmp, start;
+ unsigned int raw_25c, te1;
+ int temperature;
+ unsigned int *priv = dev_get_priv(dev);
+ u32 fuse = *priv;
+ struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
+ ANATOP_BASE_ADDR;
+ /*
+ * fuse data layout:
+ * [31:21] sensor value @ 25C
+ * [20:18] hot temperature value
+ * [17:9] sensor value of room
+ * [8:0] sensor value of hot
+ */
+
+ raw_25c = fuse >> 21;
+ if (raw_25c == 0)
+ raw_25c = 25;
+
+ te1 = (fuse >> 9) & 0x1ff;
+
+ /*
+ * now we only use single measure, every time we read
+ * the temperature, we will power on/down anadig thermal
+ * module
+ */
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
+ writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);
+
+ /* write measure freq */
+ reg = readl(&ccm_anatop->tempsense1);
+ reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
+ reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
+ writel(reg, &ccm_anatop->tempsense1);
+
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);
+
+ start = get_timer(0);
+ /* Wait max 100ms */
+ do {
+ /*
+ * Since we can not rely on finish bit, use 1ms delay to get
+ * temperature. From RM, 17us is enough to get data, but
+ * to gurantee to get the data, delay 100ms here.
+ */
+ reg = readl(&ccm_anatop->tempsense1);
+ tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
+ >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
+ } while (get_timer(0) < (start + 100));
+
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
+
+ /* power down anatop thermal sensor */
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
+ writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);
+
+ /* Single point */
+ temperature = tmp - (te1 - raw_25c);
+
+ return temperature;
+}
+#endif
int imx_thermal_get_temp(struct udevice *dev, int *temp)
{
struct thermal_data *priv = dev_get_priv(dev);
int cpu_tmp = 0;
- if (is_soc_type(MXC_SOC_MX6))
- cpu_tmp = read_cpu_temperature_mx6(dev);
+ cpu_tmp = read_cpu_temperature(dev);
+
while (cpu_tmp >= priv->critical) {
printf("CPU Temperature (%dC) too close to max (%dC)",
cpu_tmp, priv->maxc);
puts(" waiting...\n");
udelay(5000000);
- if (is_soc_type(MXC_SOC_MX6))
- cpu_tmp = read_cpu_temperature_mx6(dev);
+ cpu_tmp = read_cpu_temperature(dev);
}
*temp = cpu_tmp;
@@ -162,9 +232,17 @@ static int imx_thermal_probe(struct udevice *dev)
if (is_soc_type(MXC_SOC_MX6)) {
/* Check for valid fuse */
if (fuse == 0 || fuse == ~0) {
- printf("CPU: Thermal invalid data, fuse: 0x%x\n", fuse);
+ printf("CPU: Thermal invalid data, fuse: 0x%x\n",
+ fuse);
return -EPERM;
}
+ } else if (is_soc_type(MXC_SOC_MX7)) {
+ /* No Calibration data in FUSE? */
+ if ((fuse & 0x3ffff) == 0)
+ return -EPERM;
+ /* We do not support 105C TE2 */
+ if (((fuse & 0x1c0000) >> 18) == 0x6)
+ return -EPERM;
}
/* set critical cooling temp */