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 26 #define TRIMINFO_RELOAD 1 27 #define CORE_EN 1 28 29 #define INTEN_RISE0 1 30 #define INTEN_RISE1 (1 << 4) 31 #define INTEN_RISE2 (1 << 8) 32 #define INTEN_FALL0 (1 << 16) 33 #define INTEN_FALL1 (1 << 20) 34 #define INTEN_FALL2 (1 << 24) 35 36 #define TRIM_INFO_MASK 0xff 37 38 #define INTCLEAR_RISE0 1 39 #define INTCLEAR_RISE1 (1 << 4) 40 #define INTCLEAR_RISE2 (1 << 8) 41 #define INTCLEAR_FALL0 (1 << 16) 42 #define INTCLEAR_FALL1 (1 << 20) 43 #define INTCLEAR_FALL2 (1 << 24) 44 #define INTCLEARALL (INTCLEAR_RISE0 | INTCLEAR_RISE1 | \ 45 INTCLEAR_RISE2 | INTCLEAR_FALL0 | \ 46 INTCLEAR_FALL1 | INTCLEAR_FALL2) 47 48 /* Tmeperature threshold values for various thermal events */ 49 struct temperature_params { 50 /* minimum value in temperature code range */ 51 unsigned int min_val; 52 /* maximum value in temperature code range */ 53 unsigned int max_val; 54 /* temperature threshold to start warning */ 55 unsigned int start_warning; 56 /* temperature threshold CPU tripping */ 57 unsigned int start_tripping; 58 }; 59 60 /* Pre-defined values and thresholds for calibration of current temperature */ 61 struct tmu_data { 62 /* pre-defined temperature thresholds */ 63 struct temperature_params ts; 64 /* pre-defined efuse range minimum value */ 65 unsigned int efuse_min_value; 66 /* pre-defined efuse value for temperature calibration */ 67 unsigned int efuse_value; 68 /* pre-defined efuse range maximum value */ 69 unsigned int efuse_max_value; 70 /* current temperature sensing slope */ 71 unsigned int slope; 72 }; 73 74 /* TMU device specific details and status */ 75 struct tmu_info { 76 /* base Address for the TMU */ 77 unsigned tmu_base; 78 /* pre-defined values for calibration and thresholds */ 79 struct tmu_data data; 80 /* value required for triminfo_25 calibration */ 81 unsigned int te1; 82 /* value required for triminfo_85 calibration */ 83 unsigned int te2; 84 /* Value for measured data calibration */ 85 int dc_value; 86 /* enum value indicating status of the TMU */ 87 int tmu_state; 88 }; 89 90 /* Global struct tmu_info variable to store init values */ 91 static struct tmu_info gbl_info; 92 93 /* 94 * Get current temperature code from register, 95 * then calculate and calibrate it's value 96 * in degree celsius. 97 * 98 * @return current temperature of the chip as sensed by TMU 99 */ 100 static int get_cur_temp(struct tmu_info *info) 101 { 102 int cur_temp; 103 struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base; 104 105 /* 106 * Temperature code range between min 25 and max 125. 107 * May run more than once for first call as initial sensing 108 * has not yet happened. 109 */ 110 do { 111 cur_temp = readl(®->current_temp) & 0xff; 112 } while (cur_temp == 0 && info->tmu_state == TMU_STATUS_NORMAL); 113 114 /* Calibrate current temperature */ 115 cur_temp = cur_temp - info->te1 + info->dc_value; 116 117 return cur_temp; 118 } 119 120 /* 121 * Monitors status of the TMU device and exynos temperature 122 * 123 * @param temp pointer to the current temperature value 124 * @return enum tmu_status_t value, code indicating event to execute 125 */ 126 enum tmu_status_t tmu_monitor(int *temp) 127 { 128 int cur_temp; 129 struct tmu_data *data = &gbl_info.data; 130 131 if (gbl_info.tmu_state == TMU_STATUS_INIT) 132 return TMU_STATUS_INIT; 133 134 /* Read current temperature of the SOC */ 135 cur_temp = get_cur_temp(&gbl_info); 136 *temp = cur_temp; 137 138 /* Temperature code lies between min 25 and max 125 */ 139 if (cur_temp >= data->ts.start_tripping && 140 cur_temp <= data->ts.max_val) { 141 return TMU_STATUS_TRIPPED; 142 } else if (cur_temp >= data->ts.start_warning) { 143 return TMU_STATUS_WARNING; 144 } else if (cur_temp < data->ts.start_warning && 145 cur_temp >= data->ts.min_val) { 146 return TMU_STATUS_NORMAL; 147 } else { 148 /* Temperature code does not lie between min 25 and max 125 */ 149 gbl_info.tmu_state = TMU_STATUS_INIT; 150 debug("EXYNOS_TMU: Thermal reading failed\n"); 151 return TMU_STATUS_INIT; 152 } 153 } 154 155 /* 156 * Get TMU specific pre-defined values from FDT 157 * 158 * @param info pointer to the tmu_info struct 159 * @param blob FDT blob 160 * @return int value, 0 for success 161 */ 162 static int get_tmu_fdt_values(struct tmu_info *info, const void *blob) 163 { 164 #ifdef CONFIG_OF_CONTROL 165 int node; 166 int error = 0; 167 168 /* Get the node from FDT for TMU */ 169 node = fdtdec_next_compatible(blob, 0, 170 COMPAT_SAMSUNG_EXYNOS_TMU); 171 if (node < 0) { 172 debug("EXYNOS_TMU: No node for tmu in device tree\n"); 173 return -1; 174 } 175 176 /* 177 * Get the pre-defined TMU specific values from FDT. 178 * All of these are expected to be correct otherwise 179 * miscalculation of register values in tmu_setup_parameters 180 * may result in misleading current temperature. 181 */ 182 info->tmu_base = fdtdec_get_addr(blob, node, "reg"); 183 if (info->tmu_base == FDT_ADDR_T_NONE) { 184 debug("%s: Missing tmu-base\n", __func__); 185 return -1; 186 } 187 info->data.ts.min_val = fdtdec_get_int(blob, 188 node, "samsung,min-temp", -1); 189 error |= info->data.ts.min_val; 190 info->data.ts.max_val = fdtdec_get_int(blob, 191 node, "samsung,max-temp", -1); 192 error |= info->data.ts.max_val; 193 info->data.ts.start_warning = fdtdec_get_int(blob, 194 node, "samsung,start-warning", -1); 195 error |= info->data.ts.start_warning; 196 info->data.ts.start_tripping = fdtdec_get_int(blob, 197 node, "samsung,start-tripping", -1); 198 error |= info->data.ts.start_tripping; 199 info->data.efuse_min_value = fdtdec_get_int(blob, 200 node, "samsung,efuse-min-value", -1); 201 error |= info->data.efuse_min_value; 202 info->data.efuse_value = fdtdec_get_int(blob, 203 node, "samsung,efuse-value", -1); 204 error |= info->data.efuse_value; 205 info->data.efuse_max_value = fdtdec_get_int(blob, 206 node, "samsung,efuse-max-value", -1); 207 error |= info->data.efuse_max_value; 208 info->data.slope = fdtdec_get_int(blob, 209 node, "samsung,slope", -1); 210 error |= info->data.slope; 211 info->dc_value = fdtdec_get_int(blob, 212 node, "samsung,dc-value", -1); 213 error |= info->dc_value; 214 215 if (error == -1) { 216 debug("fail to get tmu node properties\n"); 217 return -1; 218 } 219 #endif 220 221 return 0; 222 } 223 224 /* 225 * Calibrate and calculate threshold values and 226 * enable interrupt levels 227 * 228 * @param info pointer to the tmu_info struct 229 */ 230 static void tmu_setup_parameters(struct tmu_info *info) 231 { 232 unsigned int te_code, con; 233 unsigned int warning_code, trip_code; 234 unsigned int cooling_temp; 235 unsigned int rising_value; 236 struct tmu_data *data = &info->data; 237 struct exynos5_tmu_reg *reg = (struct exynos5_tmu_reg *)info->tmu_base; 238 239 /* Must reload for reading efuse value from triminfo register */ 240 writel(TRIMINFO_RELOAD, ®->triminfo_control); 241 242 /* Get the compensation parameter */ 243 te_code = readl(®->triminfo); 244 info->te1 = te_code & TRIM_INFO_MASK; 245 info->te2 = ((te_code >> 8) & TRIM_INFO_MASK); 246 247 if ((data->efuse_min_value > info->te1) || 248 (info->te1 > data->efuse_max_value) 249 || (info->te2 != 0)) 250 info->te1 = data->efuse_value; 251 252 /* Get RISING & FALLING Threshold value */ 253 warning_code = data->ts.start_warning 254 + info->te1 - info->dc_value; 255 trip_code = data->ts.start_tripping 256 + info->te1 - info->dc_value; 257 cooling_temp = 0; 258 259 rising_value = ((warning_code << 8) | (trip_code << 16)); 260 261 /* Set interrupt level */ 262 writel(rising_value, ®->threshold_temp_rise); 263 writel(cooling_temp, ®->threshold_temp_fall); 264 265 /* 266 * Init TMU control tuning parameters 267 * [28:24] VREF - Voltage reference 268 * [15:13] THERM_TRIP_MODE - Tripping mode 269 * [12] THERM_TRIP_EN - Thermal tripping enable 270 * [11:8] BUF_SLOPE_SEL - Gain of amplifier 271 * [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin 272 */ 273 writel(data->slope, ®->tmu_control); 274 275 writel(INTCLEARALL, ®->intclear); 276 277 /* TMU core enable */ 278 con = readl(®->tmu_control); 279 con |= CORE_EN; 280 281 writel(con, ®->tmu_control); 282 283 /* LEV0 LEV1 LEV2 interrupt enable */ 284 writel(INTEN_RISE0 | INTEN_RISE1 | INTEN_RISE2, ®->inten); 285 } 286 287 /* 288 * Initialize TMU device 289 * 290 * @param blob FDT blob 291 * @return int value, 0 for success 292 */ 293 int tmu_init(const void *blob) 294 { 295 gbl_info.tmu_state = TMU_STATUS_INIT; 296 if (get_tmu_fdt_values(&gbl_info, blob) < 0) 297 goto ret; 298 299 tmu_setup_parameters(&gbl_info); 300 gbl_info.tmu_state = TMU_STATUS_NORMAL; 301 ret: 302 303 return gbl_info.tmu_state; 304 } 305