drivers/thermal/imx_thermal.c

   1 /*
   2  * (C) Copyright 2014 Freescale Semiconductor, Inc.
   3  * Author: Nitin Garg <nitin.garg@freescale.com>
   4  *             Ye Li <Ye.Li@freescale.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <config.h>
  10 #include <common.h>
  11 #include <div64.h>
  12 #include <fuse.h>
  13 #include <asm/io.h>
  14 #include <asm/arch/clock.h>
  15 #include <asm/arch/sys_proto.h>
  16 #include <dm.h>
  17 #include <errno.h>
  18 #include <malloc.h>
  19 #include <linux/math64.h>
  20 #include <thermal.h>
  21 #include <imx_thermal.h>
  22
  23 /* board will busyloop until this many degrees C below CPU max temperature */
  24 #define TEMPERATURE_HOT_DELTA   5 /* CPU maxT - 5C */
  25 #define FACTOR0                 10000000
  26 #define FACTOR1                 15423
  27 #define FACTOR2                 4148468
  28 #define OFFSET                  3580661
  29 #define MEASURE_FREQ            327
  30 #define TEMPERATURE_MIN         -40
  31 #define TEMPERATURE_HOT         85
  32 #define TEMPERATURE_MAX         125
  33
  34 #define TEMPSENSE0_TEMP_CNT_SHIFT       8
  35 #define TEMPSENSE0_TEMP_CNT_MASK        (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
  36 #define TEMPSENSE0_FINISHED             (1 << 2)
  37 #define TEMPSENSE0_MEASURE_TEMP         (1 << 1)
  38 #define TEMPSENSE0_POWER_DOWN           (1 << 0)
  39 #define MISC0_REFTOP_SELBIASOFF         (1 << 3)
  40 #define TEMPSENSE1_MEASURE_FREQ         0xffff
  41
  42 struct thermal_data {
  43         unsigned int fuse;
  44         int critical;
  45         int minc;
  46         int maxc;
  47 };
  48
  49 #if defined(CONFIG_MX6)
  50 static int read_cpu_temperature(struct udevice *dev)
  51 {
  52         int temperature;
  53         unsigned int reg, n_meas;
  54         const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
  55         struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs;
  56         struct thermal_data *priv = dev_get_priv(dev);
  57         u32 fuse = priv->fuse;
  58         int t1, n1;
  59         s64 c1, c2;
  60         s64 temp64;
  61         s32 rem;
  62
  63         /*
  64          * Sensor data layout:
  65          *   [31:20] - sensor value @ 25C
  66          * We use universal formula now and only need sensor value @ 25C
  67          * slope = 0.4445388 - (0.0016549 * 25C fuse)
  68          */
  69         n1 = fuse >> 20;
  70         t1 = 25; /* t1 always 25C */
  71
  72         /*
  73          * Derived from linear interpolation:
  74          * slope = 0.4445388 - (0.0016549 * 25C fuse)
  75          * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
  76          * offset = 3.580661
  77          * offset = OFFSET / 1000000
  78          * (Nmeas - n1) / (Tmeas - t1 - offset) = slope
  79          * We want to reduce this down to the minimum computation necessary
  80          * for each temperature read.  Also, we want Tmeas in millicelsius
  81          * and we don't want to lose precision from integer division. So...
  82          * Tmeas = (Nmeas - n1) / slope + t1 + offset
  83          * milli_Tmeas = 1000000 * (Nmeas - n1) / slope + 1000000 * t1 + OFFSET
  84          * milli_Tmeas = -1000000 * (n1 - Nmeas) / slope + 1000000 * t1 + OFFSET
  85          * Let constant c1 = (-1000000 / slope)
  86          * milli_Tmeas = (n1 - Nmeas) * c1 + 1000000 * t1 + OFFSET
  87          * Let constant c2 = n1 *c1 + 1000000 * t1
  88          * milli_Tmeas = (c2 - Nmeas * c1) + OFFSET
  89          * Tmeas = ((c2 - Nmeas * c1) + OFFSET) / 1000000
  90          */
  91         temp64 = FACTOR0;
  92         temp64 *= 1000000;
  93         temp64 = div_s64_rem(temp64, FACTOR1 * n1 - FACTOR2, &rem);
  94         c1 = temp64;
  95         c2 = n1 * c1 + 1000000 * t1;
  96
  97         /*
  98          * now we only use single measure, every time we read
  99          * the temperature, we will power on/down anadig thermal
 100          * module
 101          */
 102         writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr);
 103         writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set);
 104
 105         /* setup measure freq */
 106         reg = readl(&anatop->tempsense1);
 107         reg &= ~TEMPSENSE1_MEASURE_FREQ;
 108         reg |= MEASURE_FREQ;
 109         writel(reg, &anatop->tempsense1);
 110
 111         /* start the measurement process */
 112         writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr);
 113         writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
 114         writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set);
 115
 116         /* make sure that the latest temp is valid */
 117         while ((readl(&anatop->tempsense0) &
 118                 TEMPSENSE0_FINISHED) == 0)
 119                 udelay(10000);
 120
 121         /* read temperature count */
 122         reg = readl(&anatop->tempsense0);
 123         n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK)
 124                 >> TEMPSENSE0_TEMP_CNT_SHIFT;
 125         writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
 126
 127         /* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */
 128         temperature = div_s64_rem(c2 - n_meas * c1 + OFFSET, 1000000, &rem);
 129
 130         /* power down anatop thermal sensor */
 131         writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
 132         writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr);
 133
 134         return temperature;
 135 }
 136 #elif defined(CONFIG_MX7)
 137 static int read_cpu_temperature(struct udevice *dev)
 138 {
 139         unsigned int reg, tmp;
 140         unsigned int raw_25c, te1;
 141         int temperature;
 142         unsigned int *priv = dev_get_priv(dev);
 143         u32 fuse = *priv;
 144         struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
 145                                                  ANATOP_BASE_ADDR;
 146         /*
 147          * fuse data layout:
 148          * [31:21] sensor value @ 25C
 149          * [20:18] hot temperature value
 150          * [17:9] sensor value of room
 151          * [8:0] sensor value of hot
 152          */
 153
 154         raw_25c = fuse >> 21;
 155         if (raw_25c == 0)
 156                 raw_25c = 25;
 157
 158         te1 = (fuse >> 9) & 0x1ff;
 159
 160         /*
 161          * now we only use single measure, every time we read
 162          * the temperature, we will power on/down anadig thermal
 163          * module
 164          */
 165         writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
 166         writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);
 167
 168         /* write measure freq */
 169         reg = readl(&ccm_anatop->tempsense1);
 170         reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
 171         reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
 172         writel(reg, &ccm_anatop->tempsense1);
 173
 174         writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
 175         writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
 176         writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);
 177
 178         if (soc_rev() >= CHIP_REV_1_1) {
 179                 while ((readl(&ccm_anatop->tempsense1) &
 180                        TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
 181                         ;
 182                 reg = readl(&ccm_anatop->tempsense1);
 183                 tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
 184                        >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
 185         } else {
 186                 /*
 187                  * Since we can not rely on finish bit, use 10ms
 188                  * delay to get temperature. From RM, 17us is
 189                  * enough to get data, but to gurantee to get
 190                  * the data, delay 10ms here.
 191                  */
 192                 udelay(10000);
 193                 reg = readl(&ccm_anatop->tempsense1);
 194                 tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
 195                        >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
 196         }
 197
 198         writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
 199
 200         /* power down anatop thermal sensor */
 201         writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
 202         writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);
 203
 204         /* Single point */
 205         temperature = tmp - (te1 - raw_25c);
 206
 207         return temperature;
 208 }
 209 #endif
 210
 211 int imx_thermal_get_temp(struct udevice *dev, int *temp)
 212 {
 213         struct thermal_data *priv = dev_get_priv(dev);
 214         int cpu_tmp = 0;
 215
 216         cpu_tmp = read_cpu_temperature(dev);
 217
 218         while (cpu_tmp >= priv->critical) {
 219                 printf("CPU Temperature (%dC) too close to max (%dC)",
 220                        cpu_tmp, priv->maxc);
 221                 puts(" waiting...\n");
 222                 udelay(5000000);
 223                 cpu_tmp = read_cpu_temperature(dev);
 224         }
 225
 226         *temp = cpu_tmp;
 227
 228         return 0;
 229 }
 230
 231 static const struct dm_thermal_ops imx_thermal_ops = {
 232         .get_temp       = imx_thermal_get_temp,
 233 };
 234
 235 static int imx_thermal_probe(struct udevice *dev)
 236 {
 237         unsigned int fuse = ~0;
 238
 239         const struct imx_thermal_plat *pdata = dev_get_platdata(dev);
 240         struct thermal_data *priv = dev_get_priv(dev);
 241
 242         /* Read Temperature calibration data fuse */
 243         fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
 244
 245         if (is_soc_type(MXC_SOC_MX6)) {
 246                 /* Check for valid fuse */
 247                 if (fuse == 0 || fuse == ~0) {
 248                         debug("CPU:   Thermal invalid data, fuse: 0x%x\n",
 249                                 fuse);
 250                         return -EPERM;
 251                 }
 252         } else if (is_soc_type(MXC_SOC_MX7)) {
 253                 /* No Calibration data in FUSE? */
 254                 if ((fuse & 0x3ffff) == 0)
 255                         return -EPERM;
 256                 /* We do not support 105C TE2 */
 257                 if (((fuse & 0x1c0000) >> 18) == 0x6)
 258                         return -EPERM;
 259         }
 260
 261         /* set critical cooling temp */
 262         get_cpu_temp_grade(&priv->minc, &priv->maxc);
 263         priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
 264         priv->fuse = fuse;
 265
 266         enable_thermal_clk();
 267
 268         return 0;
 269 }
 270
 271 U_BOOT_DRIVER(imx_thermal) = {
 272         .name   = "imx_thermal",
 273         .id     = UCLASS_THERMAL,
 274         .ops    = &imx_thermal_ops,
 275         .probe  = imx_thermal_probe,
 276         .priv_auto_alloc_size = sizeof(struct thermal_data),
 277         .flags  = DM_FLAG_PRE_RELOC,
 278 };