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 */ 51 struct 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 */ 65 struct 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 */ 79 struct 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 */ 97 static 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 */ 106 static 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(®->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 */ 139 enum 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 */ 181 static int get_tmu_fdt_values(struct tmu_info *info, const void *blob) 182 { 183 #if CONFIG_IS_ENABLED(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 */ 265 static 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, ®->triminfo_control); 276 277 /* Get the compensation parameter */ 278 te_code = readl(®->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, ®->threshold_temp_rise); 303 writel(cooling_temp, ®->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, ®->tmu_control); 314 315 writel(INTCLEARALL, ®->intclear); 316 317 /* TMU core enable */ 318 con = readl(®->tmu_control); 319 con |= THERM_TRIP_EN | CORE_EN | (info->tmu_mux << 20); 320 321 writel(con, ®->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, ®->inten); 328 } 329 330 /* 331 * Initialize TMU device 332 * 333 * @param blob FDT blob 334 * @return int value, 0 for success 335 */ 336 int 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; 344 ret: 345 return gbl_info.tmu_state; 346 } 347