+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2014 Freescale Semiconductor, Inc.
* Author: Nitin Garg <nitin.garg@freescale.com>
* Ye Li <Ye.Li@freescale.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <fuse.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
+#include <asm/arch/sys_proto.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
+#include <linux/math64.h>
#include <thermal.h>
#include <imx_thermal.h>
-#define TEMPERATURE_MIN -40
-#define TEMPERATURE_HOT 80
-#define TEMPERATURE_MAX 125
+/* board will busyloop until this many degrees C below CPU max temperature */
+#define TEMPERATURE_HOT_DELTA 5 /* CPU maxT - 5C */
#define FACTOR0 10000000
-#define FACTOR1 15976
-#define FACTOR2 4297157
+#define FACTOR1 15423
+#define FACTOR2 4148468
+#define OFFSET 3580661
#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)
#define MISC0_REFTOP_SELBIASOFF (1 << 3)
#define TEMPSENSE1_MEASURE_FREQ 0xffff
+struct thermal_data {
+ unsigned int fuse;
+ int critical;
+ int minc;
+ int maxc;
+};
+
+#if defined(CONFIG_MX6)
static int read_cpu_temperature(struct udevice *dev)
{
int temperature;
unsigned int reg, n_meas;
const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs;
- unsigned int *priv = dev_get_priv(dev);
- u32 fuse = *priv;
+ struct thermal_data *priv = dev_get_priv(dev);
+ u32 fuse = priv->fuse;
int t1, n1;
- u32 c1, c2;
- u64 temp64;
+ s64 c1, c2;
+ s64 temp64;
+ s32 rem;
/*
* Sensor data layout:
* [31:20] - sensor value @ 25C
* We use universal formula now and only need sensor value @ 25C
- * slope = 0.4297157 - (0.0015976 * 25C fuse)
+ * slope = 0.4445388 - (0.0016549 * 25C fuse)
*/
n1 = fuse >> 20;
t1 = 25; /* t1 always 25C */
/*
* Derived from linear interpolation:
- * slope = 0.4297157 - (0.0015976 * 25C fuse)
+ * slope = 0.4445388 - (0.0016549 * 25C fuse)
* slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
- * (Nmeas - n1) / (Tmeas - t1) = slope
+ * offset = 3.580661
+ * offset = OFFSET / 1000000
+ * (Nmeas - n1) / (Tmeas - t1 - offset) = slope
* We want to reduce this down to the minimum computation necessary
* for each temperature read. Also, we want Tmeas in millicelsius
* and we don't want to lose precision from integer division. So...
- * Tmeas = (Nmeas - n1) / slope + t1
- * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
- * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
- * Let constant c1 = (-1000 / slope)
- * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
- * Let constant c2 = n1 *c1 + 1000 * t1
- * milli_Tmeas = c2 - Nmeas * c1
+ * Tmeas = (Nmeas - n1) / slope + t1 + offset
+ * milli_Tmeas = 1000000 * (Nmeas - n1) / slope + 1000000 * t1 + OFFSET
+ * milli_Tmeas = -1000000 * (n1 - Nmeas) / slope + 1000000 * t1 + OFFSET
+ * Let constant c1 = (-1000000 / slope)
+ * milli_Tmeas = (n1 - Nmeas) * c1 + 1000000 * t1 + OFFSET
+ * Let constant c2 = n1 *c1 + 1000000 * t1
+ * milli_Tmeas = (c2 - Nmeas * c1) + OFFSET
+ * Tmeas = ((c2 - Nmeas * c1) + OFFSET) / 1000000
*/
temp64 = FACTOR0;
- temp64 *= 1000;
- do_div(temp64, FACTOR1 * n1 - FACTOR2);
+ temp64 *= 1000000;
+ temp64 = div_s64_rem(temp64, FACTOR1 * n1 - FACTOR2, &rem);
c1 = temp64;
- c2 = n1 * c1 + 1000 * t1;
+ c2 = n1 * c1 + 1000000 * t1;
/*
* now we only use single measure, every time we read
>> TEMPSENSE0_TEMP_CNT_SHIFT;
writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
- /* milli_Tmeas = c2 - Nmeas * c1 */
- temperature = (c2 - n_meas * c1)/1000;
+ /* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */
+ temperature = div_s64_rem(c2 - n_meas * c1 + OFFSET, 1000000, &rem);
/* power down anatop thermal sensor */
writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
return temperature;
}
+#elif defined(CONFIG_MX7)
+static int read_cpu_temperature(struct udevice *dev)
+{
+ unsigned int reg, tmp;
+ 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);
+
+ if (soc_rev() >= CHIP_REV_1_1) {
+ while ((readl(&ccm_anatop->tempsense1) &
+ TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
+ ;
+ reg = readl(&ccm_anatop->tempsense1);
+ tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
+ >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
+ } else {
+ /*
+ * Since we can not rely on finish bit, use 10ms
+ * delay to get temperature. From RM, 17us is
+ * enough to get data, but to gurantee to get
+ * the data, delay 10ms here.
+ */
+ udelay(10000);
+ reg = readl(&ccm_anatop->tempsense1);
+ tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
+ >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
+ }
+
+ 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;
cpu_tmp = read_cpu_temperature(dev);
- while (cpu_tmp > TEMPERATURE_MIN && cpu_tmp < TEMPERATURE_MAX) {
- if (cpu_tmp >= TEMPERATURE_HOT) {
- printf("CPU Temperature is %d C, too hot to boot, waiting...\n",
- cpu_tmp);
- udelay(5000000);
- cpu_tmp = read_cpu_temperature(dev);
- } else {
- break;
- }
+
+ while (cpu_tmp >= priv->critical) {
+ printf("CPU Temperature (%dC) too close to max (%dC)",
+ cpu_tmp, priv->maxc);
+ puts(" waiting...\n");
+ udelay(5000000);
+ cpu_tmp = read_cpu_temperature(dev);
}
*temp = cpu_tmp;
unsigned int fuse = ~0;
const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
- unsigned int *priv = dev_get_priv(dev);
+ struct thermal_data *priv = dev_get_priv(dev);
/* Read Temperature calibration data fuse */
fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
- /* Check for valid fuse */
- if (fuse == 0 || fuse == ~0) {
- printf("CPU: Thermal invalid data, fuse: 0x%x\n", fuse);
- return -EPERM;
- } else {
- printf("CPU: Thermal calibration data: 0x%x\n", fuse);
+ if (is_soc_type(MXC_SOC_MX6)) {
+ /* Check for valid fuse */
+ if (fuse == 0 || fuse == ~0) {
+ debug("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;
}
- *priv = fuse;
+ /* set critical cooling temp */
+ get_cpu_temp_grade(&priv->minc, &priv->maxc);
+ priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
+ priv->fuse = fuse;
enable_thermal_clk();
.id = UCLASS_THERMAL,
.ops = &imx_thermal_ops,
.probe = imx_thermal_probe,
- .priv_auto_alloc_size = sizeof(unsigned int),
+ .priv_auto_alloc_size = sizeof(struct thermal_data),
.flags = DM_FLAG_PRE_RELOC,
};
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