LXR uboot/drivers/power/exynos-tmu.c

   1/*
   2 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   3 *      http://www.samsung.com
   4 * Akshay Saraswat <akshay.s@samsung.com>
   5 *
   6 * EXYNOS - Thermal Management Unit
   7 *
   8 * See file CREDITS for list of people who contributed to this
   9 * project.
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License version 2 as
  13 * published by the Free Software Foundation.
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  17 * MA 02111-1307 USA
  18 */
  19
  20#include <common.h>
  21#include <errno.h>
  22#include <fdtdec.h>
  23#include <log.h>
  24#include <tmu.h>
  25#include <asm/arch/tmu.h>
  26#include <asm/arch/power.h>
  27
  28#define TRIMINFO_RELOAD         1
  29#define CORE_EN                 1
  30#define THERM_TRIP_EN           (1 << 12)
  31
  32#define INTEN_RISE0             1
  33#define INTEN_RISE1             (1 << 4)
  34#define INTEN_RISE2             (1 << 8)
  35#define INTEN_FALL0             (1 << 16)
  36#define INTEN_FALL1             (1 << 20)
  37#define INTEN_FALL2             (1 << 24)
  38
  39#define TRIM_INFO_MASK          0xff
  40
  41#define INTCLEAR_RISE0          1
  42#define INTCLEAR_RISE1          (1 << 4)
  43#define INTCLEAR_RISE2          (1 << 8)
  44#define INTCLEAR_FALL0          (1 << 16)
  45#define INTCLEAR_FALL1          (1 << 20)
  46#define INTCLEAR_FALL2          (1 << 24)
  47#define INTCLEARALL             (INTCLEAR_RISE0 | INTCLEAR_RISE1 | \
  48                                 INTCLEAR_RISE2 | INTCLEAR_FALL0 | \
  49                                 INTCLEAR_FALL1 | INTCLEAR_FALL2)
  50
  51/* Tmeperature threshold values for various thermal events */
  52struct temperature_params {
  53        /* minimum value in temperature code range */
  54        unsigned min_val;
  55        /* maximum value in temperature code range */
  56        unsigned max_val;
  57        /* temperature threshold to start warning */
  58        unsigned start_warning;
  59        /* temperature threshold CPU tripping */
  60        unsigned start_tripping;
  61        /* temperature threshold for HW tripping */
  62        unsigned hardware_tripping;
  63};
  64
  65/* Pre-defined values and thresholds for calibration of current temperature */
  66struct tmu_data {
  67        /* pre-defined temperature thresholds */
  68        struct temperature_params ts;
  69        /* pre-defined efuse range minimum value */
  70        unsigned efuse_min_value;
  71        /* pre-defined efuse value for temperature calibration */
  72        unsigned efuse_value;
  73        /* pre-defined efuse range maximum value */
  74        unsigned efuse_max_value;
  75        /* current temperature sensing slope */
  76        unsigned slope;
  77};
  78
  79/* TMU device specific details and status */
  80struct tmu_info {
  81        /* base Address for the TMU */
  82        struct exynos5_tmu_reg *tmu_base;
  83        /* mux Address for the TMU */
  84        int tmu_mux;
  85        /* pre-defined values for calibration and thresholds */
  86        struct tmu_data data;
  87        /* value required for triminfo_25 calibration */
  88        unsigned te1;
  89        /* value required for triminfo_85 calibration */
  90        unsigned te2;
  91        /* Value for measured data calibration */
  92        int dc_value;
  93        /* enum value indicating status of the TMU */
  94        int tmu_state;
  95};
  96
  97/* Global struct tmu_info variable to store init values */
  98static struct tmu_info gbl_info;
  99
 100/*
 101 * Get current temperature code from register,
 102 * then calculate and calibrate it's value
 103 * in degree celsius.
 104 *
 105 * @return      current temperature of the chip as sensed by TMU
 106 */
 107static int get_cur_temp(struct tmu_info *info)
 108{
 109        struct exynos5_tmu_reg *reg = info->tmu_base;
 110        ulong start;
 111        int cur_temp = 0;
 112
 113        /*
 114         * Temperature code range between min 25 and max 125.
 115         * May run more than once for first call as initial sensing
 116         * has not yet happened.
 117         */
 118        if (info->tmu_state == TMU_STATUS_NORMAL) {
 119                start = get_timer(0);
 120                do {
 121                        cur_temp = readl(&reg->current_temp) & 0xff;
 122                } while ((cur_temp == 0) || (get_timer(start) > 100));
 123        }
 124
 125        if (cur_temp == 0)
 126                return cur_temp;
 127
 128        /* Calibrate current temperature */
 129        cur_temp = cur_temp - info->te1 + info->dc_value;
 130
 131        return cur_temp;
 132}
 133
 134/*
 135 * Monitors status of the TMU device and exynos temperature
 136 *
 137 * @param temp  pointer to the current temperature value
 138 * @return      enum tmu_status_t value, code indicating event to execute
 139 */
 140enum tmu_status_t tmu_monitor(int *temp)
 141{
 142        int cur_temp;
 143        struct tmu_data *data = &gbl_info.data;
 144
 145        if (gbl_info.tmu_state == TMU_STATUS_INIT)
 146                return TMU_STATUS_INIT;
 147
 148        /* Read current temperature of the SOC */
 149        cur_temp = get_cur_temp(&gbl_info);
 150
 151        if (!cur_temp)
 152                goto out;
 153
 154        *temp = cur_temp;
 155
 156        /* Temperature code lies between min 25 and max 125 */
 157        if ((cur_temp >= data->ts.start_tripping) &&
 158            (cur_temp <= data->ts.max_val))
 159                return TMU_STATUS_TRIPPED;
 160
 161        if (cur_temp >= data->ts.start_warning)
 162                return TMU_STATUS_WARNING;
 163
 164        if ((cur_temp < data->ts.start_warning) &&
 165            (cur_temp >= data->ts.min_val))
 166                return TMU_STATUS_NORMAL;
 167
 168 out:
 169        /* Temperature code does not lie between min 25 and max 125 */
 170        gbl_info.tmu_state = TMU_STATUS_INIT;
 171        debug("EXYNOS_TMU: Thermal reading failed\n");
 172        return TMU_STATUS_INIT;
 173}
 174
 175/*
 176 * Get TMU specific pre-defined values from FDT
 177 *
 178 * @param info  pointer to the tmu_info struct
 179 * @param blob  FDT blob
 180 * @return      int value, 0 for success
 181 */
 182static int get_tmu_fdt_values(struct tmu_info *info, const void *blob)
 183{
 184#if CONFIG_IS_ENABLED(OF_CONTROL)
 185        fdt_addr_t addr;
 186        int node;
 187        int error = 0;
 188
 189        /* Get the node from FDT for TMU */
 190        node = fdtdec_next_compatible(blob, 0,
 191                                      COMPAT_SAMSUNG_EXYNOS_TMU);
 192        if (node < 0) {
 193                debug("EXYNOS_TMU: No node for tmu in device tree\n");
 194                return -ENODEV;
 195        }
 196
 197        /*
 198         * Get the pre-defined TMU specific values from FDT.
 199         * All of these are expected to be correct otherwise
 200         * miscalculation of register values in tmu_setup_parameters
 201         * may result in misleading current temperature.
 202         */
 203        addr = fdtdec_get_addr(blob, node, "reg");
 204        if (addr == FDT_ADDR_T_NONE) {
 205                debug("%s: Missing tmu-base\n", __func__);
 206                return -ENODEV;
 207        }
 208        info->tmu_base = (struct exynos5_tmu_reg *)addr;
 209
 210        /* Optional field. */
 211        info->tmu_mux = fdtdec_get_int(blob,
 212                                node, "samsung,mux", -1);
 213        /* Take default value as per the user manual b(110) */
 214        if (info->tmu_mux == -1)
 215                info->tmu_mux = 0x6;
 216
 217        info->data.ts.min_val = fdtdec_get_int(blob,
 218                                node, "samsung,min-temp", -1);
 219        error |= (info->data.ts.min_val == -1);
 220        info->data.ts.max_val = fdtdec_get_int(blob,
 221                                node, "samsung,max-temp", -1);
 222        error |= (info->data.ts.max_val == -1);
 223        info->data.ts.start_warning = fdtdec_get_int(blob,
 224                                node, "samsung,start-warning", -1);
 225        error |= (info->data.ts.start_warning == -1);
 226        info->data.ts.start_tripping = fdtdec_get_int(blob,
 227                                node, "samsung,start-tripping", -1);
 228        error |= (info->data.ts.start_tripping == -1);
 229        info->data.ts.hardware_tripping = fdtdec_get_int(blob,
 230                                node, "samsung,hw-tripping", -1);
 231        error |= (info->data.ts.hardware_tripping == -1);
 232        info->data.efuse_min_value = fdtdec_get_int(blob,
 233                                node, "samsung,efuse-min-value", -1);
 234        error |= (info->data.efuse_min_value == -1);
 235        info->data.efuse_value = fdtdec_get_int(blob,
 236                                node, "samsung,efuse-value", -1);
 237        error |= (info->data.efuse_value == -1);
 238        info->data.efuse_max_value = fdtdec_get_int(blob,
 239                                node, "samsung,efuse-max-value", -1);
 240        error |= (info->data.efuse_max_value == -1);
 241        info->data.slope = fdtdec_get_int(blob,
 242                                node, "samsung,slope", -1);
 243        error |= (info->data.slope == -1);
 244        info->dc_value = fdtdec_get_int(blob,
 245                                node, "samsung,dc-value", -1);
 246        error |= (info->dc_value == -1);
 247
 248        if (error) {
 249                debug("fail to get tmu node properties\n");
 250                return -EINVAL;
 251        }
 252#else
 253        /* Non DT support may never be added. Just in case  */
 254        return -ENODEV;
 255#endif
 256
 257        return 0;
 258}
 259
 260/*
 261 * Calibrate and calculate threshold values and
 262 * enable interrupt levels
 263 *
 264 * @param       info pointer to the tmu_info struct
 265 */
 266static void tmu_setup_parameters(struct tmu_info *info)
 267{
 268        unsigned te_code, con;
 269        unsigned warning_code, trip_code, hwtrip_code;
 270        unsigned cooling_temp;
 271        unsigned rising_value;
 272        struct tmu_data *data = &info->data;
 273        struct exynos5_tmu_reg *reg = info->tmu_base;
 274
 275        /* Must reload for reading efuse value from triminfo register */
 276        writel(TRIMINFO_RELOAD, &reg->triminfo_control);
 277
 278        /* Get the compensation parameter */
 279        te_code = readl(&reg->triminfo);
 280        info->te1 = te_code & TRIM_INFO_MASK;
 281        info->te2 = ((te_code >> 8) & TRIM_INFO_MASK);
 282
 283        if ((data->efuse_min_value > info->te1) ||
 284                        (info->te1 > data->efuse_max_value)
 285                        ||  (info->te2 != 0))
 286                info->te1 = data->efuse_value;
 287
 288        /* Get RISING & FALLING Threshold value */
 289        warning_code = data->ts.start_warning
 290                        + info->te1 - info->dc_value;
 291        trip_code = data->ts.start_tripping
 292                        + info->te1 - info->dc_value;
 293        hwtrip_code = data->ts.hardware_tripping
 294                        + info->te1 - info->dc_value;
 295
 296        cooling_temp = 0;
 297
 298        rising_value = ((warning_code << 8) |
 299                        (trip_code << 16) |
 300                        (hwtrip_code << 24));
 301
 302        /* Set interrupt level */
 303        writel(rising_value, &reg->threshold_temp_rise);
 304        writel(cooling_temp, &reg->threshold_temp_fall);
 305
 306        /*
 307         * Init TMU control tuning parameters
 308         * [28:24] VREF - Voltage reference
 309         * [15:13] THERM_TRIP_MODE - Tripping mode
 310         * [12] THERM_TRIP_EN - Thermal tripping enable
 311         * [11:8] BUF_SLOPE_SEL - Gain of amplifier
 312         * [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin
 313         */
 314        writel(data->slope, &reg->tmu_control);
 315
 316        writel(INTCLEARALL, &reg->intclear);
 317
 318        /* TMU core enable */
 319        con = readl(&reg->tmu_control);
 320        con |= THERM_TRIP_EN | CORE_EN | (info->tmu_mux << 20);
 321
 322        writel(con, &reg->tmu_control);
 323
 324        /* Enable HW thermal trip */
 325        set_hw_thermal_trip();
 326
 327        /* LEV1 LEV2 interrupt enable */
 328        writel(INTEN_RISE1 | INTEN_RISE2, &reg->inten);
 329}
 330
 331/*
 332 * Initialize TMU device
 333 *
 334 * @param blob  FDT blob
 335 * @return      int value, 0 for success
 336 */
 337int tmu_init(const void *blob)
 338{
 339        gbl_info.tmu_state = TMU_STATUS_INIT;
 340        if (get_tmu_fdt_values(&gbl_info, blob) < 0)
 341                goto ret;
 342
 343        tmu_setup_parameters(&gbl_info);
 344        gbl_info.tmu_state = TMU_STATUS_NORMAL;
 345ret:
 346        return gbl_info.tmu_state;
 347}
 348