thermal: imx: add imx7d soc thermal support

Add imx7 SoC thermal driver support

Signed-off-by: Adrian Alonso <aalonso@freescale.com>

diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index d90874e5ec7a7aa13b9f4885f9c74b9be493fabd..ca35be837bed0840e27e848c891f79a30890f7e9 100644 (file)
--- 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 */