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