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 int min_val; 54 /* maximum value in temperature code range */ 55 unsigned int max_val; 56 /* temperature threshold to start warning */ 57 unsigned int start_warning; 58 /* temperature threshold CPU tripping */ 59 unsigned int start_tripping; 60 /* temperature threshold for HW tripping */ 61 unsigned int 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 int efuse_min_value; 70 /* pre-defined efuse value for temperature calibration */ 71 unsigned int efuse_value; 72 /* pre-defined efuse range maximum value */ 73 unsigned int efuse_max_value; 74 /* current temperature sensing slope */ 75 unsigned int slope; 76 }; 77 78 /* TMU device specific details and status */ 79 struct tmu_info { 80 /* base Address for the TMU */ 81 unsigned tmu_base; 82 /* pre-defined values for calibration and thresholds */ 83 struct tmu_data data; 84 /* value required for triminfo_25 calibration */ 85 unsigned int te1; 86 /* value required for triminfo_85 calibration */ 87 unsigned int te2; 88 /* Value for measured data calibration */ 89 int dc_value; 90 /* enum value indicating status of the TMU */ 91 int tmu_state; 92 }; 93 94 /* Global struct tmu_info variable to store init values */ 95 static struct tmu_info gbl_info; 96 97 /* 98 * Get current temperature code from register, 99 * then calculate and calibrate it's value 100 * in degree celsius. 101 * 102 * @return current temperature of the chip as sensed by TMU 103 */ 104 static int get_cur_temp(struct tmu_info *info) 105 { 106 int cur_temp; 107 struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base; 108 109 /* 110 * Temperature code range between min 25 and max 125. 111 * May run more than once for first call as initial sensing 112 * has not yet happened. 113 */ 114 do { 115 cur_temp = readl(®->current_temp) & 0xff; 116 } while (cur_temp == 0 && info->tmu_state == TMU_STATUS_NORMAL); 117 118 /* Calibrate current temperature */ 119 cur_temp = cur_temp - info->te1 + info->dc_value; 120 121 return cur_temp; 122 } 123 124 /* 125 * Monitors status of the TMU device and exynos temperature 126 * 127 * @param temp pointer to the current temperature value 128 * @return enum tmu_status_t value, code indicating event to execute 129 */ 130 enum tmu_status_t tmu_monitor(int *temp) 131 { 132 int cur_temp; 133 struct tmu_data *data = &gbl_info.data; 134 135 if (gbl_info.tmu_state == TMU_STATUS_INIT) 136 return TMU_STATUS_INIT; 137 138 /* Read current temperature of the SOC */ 139 cur_temp = get_cur_temp(&gbl_info); 140 *temp = cur_temp; 141 142 /* Temperature code lies between min 25 and max 125 */ 143 if (cur_temp >= data->ts.start_tripping && 144 cur_temp <= data->ts.max_val) { 145 return TMU_STATUS_TRIPPED; 146 } else if (cur_temp >= data->ts.start_warning) { 147 return TMU_STATUS_WARNING; 148 } else if (cur_temp < data->ts.start_warning && 149 cur_temp >= data->ts.min_val) { 150 return TMU_STATUS_NORMAL; 151 } else { 152 /* Temperature code does not lie between min 25 and max 125 */ 153 gbl_info.tmu_state = TMU_STATUS_INIT; 154 debug("EXYNOS_TMU: Thermal reading failed\n"); 155 return TMU_STATUS_INIT; 156 } 157 } 158 159 /* 160 * Get TMU specific pre-defined values from FDT 161 * 162 * @param info pointer to the tmu_info struct 163 * @param blob FDT blob 164 * @return int value, 0 for success 165 */ 166 static int get_tmu_fdt_values(struct tmu_info *info, const void *blob) 167 { 168 #ifdef CONFIG_OF_CONTROL 169 int node; 170 int error = 0; 171 172 /* Get the node from FDT for TMU */ 173 node = fdtdec_next_compatible(blob, 0, 174 COMPAT_SAMSUNG_EXYNOS_TMU); 175 if (node < 0) { 176 debug("EXYNOS_TMU: No node for tmu in device tree\n"); 177 return -1; 178 } 179 180 /* 181 * Get the pre-defined TMU specific values from FDT. 182 * All of these are expected to be correct otherwise 183 * miscalculation of register values in tmu_setup_parameters 184 * may result in misleading current temperature. 185 */ 186 info->tmu_base = fdtdec_get_addr(blob, node, "reg"); 187 if (info->tmu_base == FDT_ADDR_T_NONE) { 188 debug("%s: Missing tmu-base\n", __func__); 189 return -1; 190 } 191 info->data.ts.min_val = fdtdec_get_int(blob, 192 node, "samsung,min-temp", -1); 193 error |= info->data.ts.min_val; 194 info->data.ts.max_val = fdtdec_get_int(blob, 195 node, "samsung,max-temp", -1); 196 error |= info->data.ts.max_val; 197 info->data.ts.start_warning = fdtdec_get_int(blob, 198 node, "samsung,start-warning", -1); 199 error |= info->data.ts.start_warning; 200 info->data.ts.start_tripping = fdtdec_get_int(blob, 201 node, "samsung,start-tripping", -1); 202 error |= info->data.ts.start_tripping; 203 info->data.ts.hardware_tripping = fdtdec_get_int(blob, 204 node, "samsung,hw-tripping", -1); 205 error |= info->data.ts.hardware_tripping; 206 info->data.efuse_min_value = fdtdec_get_int(blob, 207 node, "samsung,efuse-min-value", -1); 208 error |= info->data.efuse_min_value; 209 info->data.efuse_value = fdtdec_get_int(blob, 210 node, "samsung,efuse-value", -1); 211 error |= info->data.efuse_value; 212 info->data.efuse_max_value = fdtdec_get_int(blob, 213 node, "samsung,efuse-max-value", -1); 214 error |= info->data.efuse_max_value; 215 info->data.slope = fdtdec_get_int(blob, 216 node, "samsung,slope", -1); 217 error |= info->data.slope; 218 info->dc_value = fdtdec_get_int(blob, 219 node, "samsung,dc-value", -1); 220 error |= info->dc_value; 221 222 if (error == -1) { 223 debug("fail to get tmu node properties\n"); 224 return -1; 225 } 226 #endif 227 228 return 0; 229 } 230 231 /* 232 * Calibrate and calculate threshold values and 233 * enable interrupt levels 234 * 235 * @param info pointer to the tmu_info struct 236 */ 237 static void tmu_setup_parameters(struct tmu_info *info) 238 { 239 unsigned int te_code, con; 240 unsigned int warning_code, trip_code, hwtrip_code; 241 unsigned int cooling_temp; 242 unsigned int rising_value; 243 struct tmu_data *data = &info->data; 244 struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base; 245 246 /* Must reload for reading efuse value from triminfo register */ 247 writel(TRIMINFO_RELOAD, ®->triminfo_control); 248 249 /* Get the compensation parameter */ 250 te_code = readl(®->triminfo); 251 info->te1 = te_code & TRIM_INFO_MASK; 252 info->te2 = ((te_code >> 8) & TRIM_INFO_MASK); 253 254 if ((data->efuse_min_value > info->te1) || 255 (info->te1 > data->efuse_max_value) 256 || (info->te2 != 0)) 257 info->te1 = data->efuse_value; 258 259 /* Get RISING & FALLING Threshold value */ 260 warning_code = data->ts.start_warning 261 + info->te1 - info->dc_value; 262 trip_code = data->ts.start_tripping 263 + info->te1 - info->dc_value; 264 hwtrip_code = data->ts.hardware_tripping 265 + info->te1 - info->dc_value; 266 267 cooling_temp = 0; 268 269 rising_value = ((warning_code << 8) | 270 (trip_code << 16) | 271 (hwtrip_code << 24)); 272 273 /* Set interrupt level */ 274 writel(rising_value, ®->threshold_temp_rise); 275 writel(cooling_temp, ®->threshold_temp_fall); 276 277 /* 278 * Init TMU control tuning parameters 279 * [28:24] VREF - Voltage reference 280 * [15:13] THERM_TRIP_MODE - Tripping mode 281 * [12] THERM_TRIP_EN - Thermal tripping enable 282 * [11:8] BUF_SLOPE_SEL - Gain of amplifier 283 * [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin 284 */ 285 writel(data->slope, ®->tmu_control); 286 287 writel(INTCLEARALL, ®->intclear); 288 289 /* TMU core enable */ 290 con = readl(®->tmu_control); 291 con |= THERM_TRIP_EN | CORE_EN; 292 293 writel(con, ®->tmu_control); 294 295 /* Enable HW thermal trip */ 296 set_hw_thermal_trip(); 297 298 /* LEV1 LEV2 interrupt enable */ 299 writel(INTEN_RISE1 | INTEN_RISE2, ®->inten); 300 } 301 302 /* 303 * Initialize TMU device 304 * 305 * @param blob FDT blob 306 * @return int value, 0 for success 307 */ 308 int tmu_init(const void *blob) 309 { 310 gbl_info.tmu_state = TMU_STATUS_INIT; 311 if (get_tmu_fdt_values(&gbl_info, blob) < 0) 312 goto ret; 313 314 tmu_setup_parameters(&gbl_info); 315 gbl_info.tmu_state = TMU_STATUS_NORMAL; 316 ret: 317 318 return gbl_info.tmu_state; 319 } 320