LXR uboot/drivers/thermal/imx

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2014 Freescale Semiconductor, Inc.
   4 * Author: Nitin Garg <nitin.garg@freescale.com>
   5 *             Ye Li <Ye.Li@freescale.com>
   6 */
   7
   8#include <config.h>
   9#include <common.h>
  10#include <div64.h>
  11#include <fuse.h>
  12#include <log.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/delay.h>
  20#include <linux/math64.h>
  21#include <thermal.h>
  22#include <imx_thermal.h>
  23
  24/* board will busyloop until this many degrees C below CPU max temperature */
  25#define TEMPERATURE_HOT_DELTA   5 /* CPU maxT - 5C */
  26#define FACTOR0                 10000000
  27#define FACTOR1                 15423
  28#define FACTOR2                 4148468
  29#define OFFSET                  3580661
  30#define MEASURE_FREQ            327
  31#define TEMPERATURE_MIN         -40
  32#define TEMPERATURE_HOT         85
  33#define TEMPERATURE_MAX         125
  34
  35#define TEMPSENSE0_TEMP_CNT_SHIFT       8
  36#define TEMPSENSE0_TEMP_CNT_MASK        (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
  37#define TEMPSENSE0_FINISHED             (1 << 2)
  38#define TEMPSENSE0_MEASURE_TEMP         (1 << 1)
  39#define TEMPSENSE0_POWER_DOWN           (1 << 0)
  40#define MISC0_REFTOP_SELBIASOFF         (1 << 3)
  41#define TEMPSENSE1_MEASURE_FREQ         0xffff
  42
  43struct thermal_data {
  44        unsigned int fuse;
  45        int critical;
  46        int minc;
  47        int maxc;
  48};
  49
  50#if defined(CONFIG_MX6)
  51static int read_cpu_temperature(struct udevice *dev)
  52{
  53        int temperature;
  54        unsigned int reg, n_meas;
  55        const struct imx_thermal_plat *pdata = dev_get_plat(dev);
  56        struct anatop_regs *anatop = (struct anatop_regs *)pdata->regs;
  57        struct thermal_data *priv = dev_get_priv(dev);
  58        u32 fuse = priv->fuse;
  59        int t1, n1;
  60        s64 c1, c2;
  61        s64 temp64;
  62        s32 rem;
  63
  64        /*
  65         * Sensor data layout:
  66         *   [31:20] - sensor value @ 25C
  67         * We use universal formula now and only need sensor value @ 25C
  68         * slope = 0.4445388 - (0.0016549 * 25C fuse)
  69         */
  70        n1 = fuse >> 20;
  71        t1 = 25; /* t1 always 25C */
  72
  73        /*
  74         * Derived from linear interpolation:
  75         * slope = 0.4445388 - (0.0016549 * 25C fuse)
  76         * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
  77         * offset = 3.580661
  78         * offset = OFFSET / 1000000
  79         * (Nmeas - n1) / (Tmeas - t1 - offset) = slope
  80         * We want to reduce this down to the minimum computation necessary
  81         * for each temperature read.  Also, we want Tmeas in millicelsius
  82         * and we don't want to lose precision from integer division. So...
  83         * Tmeas = (Nmeas - n1) / slope + t1 + offset
  84         * milli_Tmeas = 1000000 * (Nmeas - n1) / slope + 1000000 * t1 + OFFSET
  85         * milli_Tmeas = -1000000 * (n1 - Nmeas) / slope + 1000000 * t1 + OFFSET
  86         * Let constant c1 = (-1000000 / slope)
  87         * milli_Tmeas = (n1 - Nmeas) * c1 + 1000000 * t1 + OFFSET
  88         * Let constant c2 = n1 *c1 + 1000000 * t1
  89         * milli_Tmeas = (c2 - Nmeas * c1) + OFFSET
  90         * Tmeas = ((c2 - Nmeas * c1) + OFFSET) / 1000000
  91         */
  92        temp64 = FACTOR0;
  93        temp64 *= 1000000;
  94        temp64 = div_s64_rem(temp64, FACTOR1 * n1 - FACTOR2, &rem);
  95        c1 = temp64;
  96        c2 = n1 * c1 + 1000000 * t1;
  97
  98        /*
  99         * now we only use single measure, every time we read
 100         * the temperature, we will power on/down anadig thermal
 101         * module
 102         */
 103        writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_clr);
 104        writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_set);
 105
 106        /* setup measure freq */
 107        reg = readl(&anatop->tempsense1);
 108        reg &= ~TEMPSENSE1_MEASURE_FREQ;
 109        reg |= MEASURE_FREQ;
 110        writel(reg, &anatop->tempsense1);
 111
 112        /* start the measurement process */
 113        writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_clr);
 114        writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
 115        writel(TEMPSENSE0_MEASURE_TEMP, &anatop->tempsense0_set);
 116
 117        /* make sure that the latest temp is valid */
 118        while ((readl(&anatop->tempsense0) &
 119                TEMPSENSE0_FINISHED) == 0)
 120                udelay(10000);
 121
 122        /* read temperature count */
 123        reg = readl(&anatop->tempsense0);
 124        n_meas = (reg & TEMPSENSE0_TEMP_CNT_MASK)
 125                >> TEMPSENSE0_TEMP_CNT_SHIFT;
 126        writel(TEMPSENSE0_FINISHED, &anatop->tempsense0_clr);
 127
 128        /* Tmeas = (c2 - Nmeas * c1 + OFFSET) / 1000000 */
 129        temperature = div_s64_rem(c2 - n_meas * c1 + OFFSET, 1000000, &rem);
 130
 131        /* power down anatop thermal sensor */
 132        writel(TEMPSENSE0_POWER_DOWN, &anatop->tempsense0_set);
 133        writel(MISC0_REFTOP_SELBIASOFF, &anatop->ana_misc0_clr);
 134
 135        return temperature;
 136}
 137#elif defined(CONFIG_MX7)
 138static int read_cpu_temperature(struct udevice *dev)
 139{
 140        unsigned int reg, tmp;
 141        unsigned int raw_25c, te1;
 142        int temperature;
 143        unsigned int *priv = dev_get_priv(dev);
 144        u32 fuse = *priv;
 145        struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
 146                                                 ANATOP_BASE_ADDR;
 147        /*
 148         * fuse data layout:
 149         * [31:21] sensor value @ 25C
 150         * [20:18] hot temperature value
 151         * [17:9] sensor value of room
 152         * [8:0] sensor value of hot
 153         */
 154
 155        raw_25c = fuse >> 21;
 156        if (raw_25c == 0)
 157                raw_25c = 25;
 158
 159        te1 = (fuse >> 9) & 0x1ff;
 160
 161        /*
 162         * now we only use single measure, every time we read
 163         * the temperature, we will power on/down anadig thermal
 164         * module
 165         */
 166        writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
 167        writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);
 168
 169        /* write measure freq */
 170        reg = readl(&ccm_anatop->tempsense1);
 171        reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
 172        reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
 173        writel(reg, &ccm_anatop->tempsense1);
 174
 175        writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
 176        writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
 177        writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);
 178
 179        if (soc_rev() >= CHIP_REV_1_1) {
 180                while ((readl(&ccm_anatop->tempsense1) &
 181                       TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK) == 0)
 182                        ;
 183                reg = readl(&ccm_anatop->tempsense1);
 184                tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
 185                       >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
 186        } else {
 187                /*
 188                 * Since we can not rely on finish bit, use 10ms
 189                 * delay to get temperature. From RM, 17us is
 190                 * enough to get data, but to gurantee to get
 191                 * the data, delay 10ms here.
 192                 */
 193                udelay(10000);
 194                reg = readl(&ccm_anatop->tempsense1);
 195                tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
 196                       >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
 197        }
 198
 199        writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
 200
 201        /* power down anatop thermal sensor */
 202        writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
 203        writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);
 204
 205        /* Single point */
 206        temperature = tmp - (te1 - raw_25c);
 207
 208        return temperature;
 209}
 210#endif
 211
 212int imx_thermal_get_temp(struct udevice *dev, int *temp)
 213{
 214        struct thermal_data *priv = dev_get_priv(dev);
 215        int cpu_tmp = 0;
 216
 217        cpu_tmp = read_cpu_temperature(dev);
 218
 219        while (cpu_tmp >= priv->critical) {
 220                printf("CPU Temperature (%dC) too close to max (%dC)",
 221                       cpu_tmp, priv->maxc);
 222                puts(" waiting...\n");
 223                udelay(5000000);
 224                cpu_tmp = read_cpu_temperature(dev);
 225        }
 226
 227        *temp = cpu_tmp;
 228
 229        return 0;
 230}
 231
 232static const struct dm_thermal_ops imx_thermal_ops = {
 233        .get_temp       = imx_thermal_get_temp,
 234};
 235
 236static int imx_thermal_probe(struct udevice *dev)
 237{
 238        unsigned int fuse = ~0;
 239
 240        const struct imx_thermal_plat *pdata = dev_get_plat(dev);
 241        struct thermal_data *priv = dev_get_priv(dev);
 242
 243        /* Read Temperature calibration data fuse */
 244        fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
 245
 246        if (is_soc_type(MXC_SOC_MX6)) {
 247                /* Check for valid fuse */
 248                if (fuse == 0 || fuse == ~0) {
 249                        debug("CPU:   Thermal invalid data, fuse: 0x%x\n",
 250                                fuse);
 251                        return -EPERM;
 252                }
 253        } else if (is_soc_type(MXC_SOC_MX7)) {
 254                /* No Calibration data in FUSE? */
 255                if ((fuse & 0x3ffff) == 0)
 256                        return -EPERM;
 257                /* We do not support 105C TE2 */
 258                if (((fuse & 0x1c0000) >> 18) == 0x6)
 259                        return -EPERM;
 260        }
 261
 262        /* set critical cooling temp */
 263        get_cpu_temp_grade(&priv->minc, &priv->maxc);
 264        priv->critical = priv->maxc - TEMPERATURE_HOT_DELTA;
 265        priv->fuse = fuse;
 266
 267        enable_thermal_clk();
 268
 269        return 0;
 270}
 271
 272U_BOOT_DRIVER(imx_thermal) = {
 273        .name   = "imx_thermal",
 274        .id     = UCLASS_THERMAL,
 275        .ops    = &imx_thermal_ops,
 276        .probe  = imx_thermal_probe,
 277        .priv_auto      = sizeof(struct thermal_data),
 278        .flags  = DM_FLAG_PRE_RELOC,
 279};
 280