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 */
get_cur_temp(struct tmu_info * info)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 */
tmu_monitor(int * temp)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 */
get_tmu_fdt_values(struct tmu_info * info,const void * blob)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 -ENODEV;
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 -ENODEV;
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 -EINVAL;
250 }
251 #else
252 /* Non DT support may never be added. Just in case */
253 return -ENODEV;
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 */
tmu_setup_parameters(struct tmu_info * info)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 */
tmu_init(const void * blob)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