2 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com
4 * Akshay Saraswat <akshay.s@samsung.com>
6 * EXYNOS - Thermal Management Unit
8 * See file CREDITS for list of people who contributed to this
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,
24 #include <asm/arch/tmu.h>
25 #include <asm/arch/power.h>
27 #define TRIMINFO_RELOAD 1
29 #define THERM_TRIP_EN (1 << 12)
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)
38 #define TRIM_INFO_MASK 0xff
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)
50 /* Tmeperature threshold values for various thermal events */
51 struct temperature_params {
52 /* minimum value in temperature code range */
54 /* maximum value in temperature code range */
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;
64 /* Pre-defined values and thresholds for calibration of current temperature */
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 */
72 /* pre-defined efuse range maximum value */
73 unsigned efuse_max_value;
74 /* current temperature sensing slope */
78 /* TMU device specific details and status */
80 /* base Address for the TMU */
81 struct exynos5_tmu_reg *tmu_base;
82 /* pre-defined values for calibration and thresholds */
84 /* value required for triminfo_25 calibration */
86 /* value required for triminfo_85 calibration */
88 /* Value for measured data calibration */
90 /* enum value indicating status of the TMU */
94 /* Global struct tmu_info variable to store init values */
95 static struct tmu_info gbl_info;
98 * Get current temperature code from register,
99 * then calculate and calibrate it's value
102 * @return current temperature of the chip as sensed by TMU
104 static int get_cur_temp(struct tmu_info *info)
106 struct exynos5_tmu_reg *reg = info->tmu_base;
111 * Temperature code range between min 25 and max 125.
112 * May run more than once for first call as initial sensing
113 * has not yet happened.
115 if (info->tmu_state == TMU_STATUS_NORMAL) {
116 start = get_timer(0);
118 cur_temp = readl(®->current_temp) & 0xff;
119 } while ((cur_temp == 0) || (get_timer(start) > 100));
125 /* Calibrate current temperature */
126 cur_temp = cur_temp - info->te1 + info->dc_value;
132 * Monitors status of the TMU device and exynos temperature
134 * @param temp pointer to the current temperature value
135 * @return enum tmu_status_t value, code indicating event to execute
137 enum tmu_status_t tmu_monitor(int *temp)
140 struct tmu_data *data = &gbl_info.data;
142 if (gbl_info.tmu_state == TMU_STATUS_INIT)
143 return TMU_STATUS_INIT;
145 /* Read current temperature of the SOC */
146 cur_temp = get_cur_temp(&gbl_info);
153 /* Temperature code lies between min 25 and max 125 */
154 if ((cur_temp >= data->ts.start_tripping) &&
155 (cur_temp <= data->ts.max_val))
156 return TMU_STATUS_TRIPPED;
158 if (cur_temp >= data->ts.start_warning)
159 return TMU_STATUS_WARNING;
161 if ((cur_temp < data->ts.start_warning) &&
162 (cur_temp >= data->ts.min_val))
163 return TMU_STATUS_NORMAL;
166 /* Temperature code does not lie between min 25 and max 125 */
167 gbl_info.tmu_state = TMU_STATUS_INIT;
168 debug("EXYNOS_TMU: Thermal reading failed\n");
169 return TMU_STATUS_INIT;
173 * Get TMU specific pre-defined values from FDT
175 * @param info pointer to the tmu_info struct
176 * @param blob FDT blob
177 * @return int value, 0 for success
179 static int get_tmu_fdt_values(struct tmu_info *info, const void *blob)
181 #ifdef CONFIG_OF_CONTROL
186 /* Get the node from FDT for TMU */
187 node = fdtdec_next_compatible(blob, 0,
188 COMPAT_SAMSUNG_EXYNOS_TMU);
190 debug("EXYNOS_TMU: No node for tmu in device tree\n");
195 * Get the pre-defined TMU specific values from FDT.
196 * All of these are expected to be correct otherwise
197 * miscalculation of register values in tmu_setup_parameters
198 * may result in misleading current temperature.
200 addr = fdtdec_get_addr(blob, node, "reg");
201 if (addr == FDT_ADDR_T_NONE) {
202 debug("%s: Missing tmu-base\n", __func__);
205 info->tmu_base = (struct exynos5_tmu_reg *)addr;
207 info->data.ts.min_val = fdtdec_get_int(blob,
208 node, "samsung,min-temp", -1);
209 error |= (info->data.ts.min_val == -1);
210 info->data.ts.max_val = fdtdec_get_int(blob,
211 node, "samsung,max-temp", -1);
212 error |= (info->data.ts.max_val == -1);
213 info->data.ts.start_warning = fdtdec_get_int(blob,
214 node, "samsung,start-warning", -1);
215 error |= (info->data.ts.start_warning == -1);
216 info->data.ts.start_tripping = fdtdec_get_int(blob,
217 node, "samsung,start-tripping", -1);
218 error |= (info->data.ts.start_tripping == -1);
219 info->data.ts.hardware_tripping = fdtdec_get_int(blob,
220 node, "samsung,hw-tripping", -1);
221 error |= (info->data.ts.hardware_tripping == -1);
222 info->data.efuse_min_value = fdtdec_get_int(blob,
223 node, "samsung,efuse-min-value", -1);
224 error |= (info->data.efuse_min_value == -1);
225 info->data.efuse_value = fdtdec_get_int(blob,
226 node, "samsung,efuse-value", -1);
227 error |= (info->data.efuse_value == -1);
228 info->data.efuse_max_value = fdtdec_get_int(blob,
229 node, "samsung,efuse-max-value", -1);
230 error |= (info->data.efuse_max_value == -1);
231 info->data.slope = fdtdec_get_int(blob,
232 node, "samsung,slope", -1);
233 error |= (info->data.slope == -1);
234 info->dc_value = fdtdec_get_int(blob,
235 node, "samsung,dc-value", -1);
236 error |= (info->dc_value == -1);
239 debug("fail to get tmu node properties\n");
243 /* Non DT support may never be added. Just in case */
251 * Calibrate and calculate threshold values and
252 * enable interrupt levels
254 * @param info pointer to the tmu_info struct
256 static void tmu_setup_parameters(struct tmu_info *info)
258 unsigned te_code, con;
259 unsigned warning_code, trip_code, hwtrip_code;
260 unsigned cooling_temp;
261 unsigned rising_value;
262 struct tmu_data *data = &info->data;
263 struct exynos5_tmu_reg *reg = info->tmu_base;
265 /* Must reload for reading efuse value from triminfo register */
266 writel(TRIMINFO_RELOAD, ®->triminfo_control);
268 /* Get the compensation parameter */
269 te_code = readl(®->triminfo);
270 info->te1 = te_code & TRIM_INFO_MASK;
271 info->te2 = ((te_code >> 8) & TRIM_INFO_MASK);
273 if ((data->efuse_min_value > info->te1) ||
274 (info->te1 > data->efuse_max_value)
276 info->te1 = data->efuse_value;
278 /* Get RISING & FALLING Threshold value */
279 warning_code = data->ts.start_warning
280 + info->te1 - info->dc_value;
281 trip_code = data->ts.start_tripping
282 + info->te1 - info->dc_value;
283 hwtrip_code = data->ts.hardware_tripping
284 + info->te1 - info->dc_value;
288 rising_value = ((warning_code << 8) |
290 (hwtrip_code << 24));
292 /* Set interrupt level */
293 writel(rising_value, ®->threshold_temp_rise);
294 writel(cooling_temp, ®->threshold_temp_fall);
297 * Init TMU control tuning parameters
298 * [28:24] VREF - Voltage reference
299 * [15:13] THERM_TRIP_MODE - Tripping mode
300 * [12] THERM_TRIP_EN - Thermal tripping enable
301 * [11:8] BUF_SLOPE_SEL - Gain of amplifier
302 * [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin
304 writel(data->slope, ®->tmu_control);
306 writel(INTCLEARALL, ®->intclear);
308 /* TMU core enable */
309 con = readl(®->tmu_control);
310 con |= THERM_TRIP_EN | CORE_EN;
312 writel(con, ®->tmu_control);
314 /* Enable HW thermal trip */
315 set_hw_thermal_trip();
317 /* LEV1 LEV2 interrupt enable */
318 writel(INTEN_RISE1 | INTEN_RISE2, ®->inten);
322 * Initialize TMU device
324 * @param blob FDT blob
325 * @return int value, 0 for success
327 int tmu_init(const void *blob)
329 gbl_info.tmu_state = TMU_STATUS_INIT;
330 if (get_tmu_fdt_values(&gbl_info, blob) < 0)
333 tmu_setup_parameters(&gbl_info);
334 gbl_info.tmu_state = TMU_STATUS_NORMAL;
336 return gbl_info.tmu_state;