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thermal: imx: add imx7d soc thermal support

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Add imx7 SoC thermal driver support

Signed-off-by: Adrian Alonso <aalonso@freescale.com>
This commit is contained in:
Adrian Alonso 2015-09-02 13:54:22 -05:00 • committed by Stefano Babic
parent 648539c906
commit d1aa6f2d58
1 changed files with 84 additions and 6 deletions
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90
drivers/thermal/imx_thermal.c
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@ -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 */