summaryrefslogtreecommitdiff
path: root/drivers/power/exynos-tmu.c
blob: 4fba7b527c6b8be96ede822692f4ae771ae26d84 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
/*
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *      http://www.samsung.com
 * Akshay Saraswat <akshay.s@samsung.com>
 *
 * EXYNOS - Thermal Management Unit
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <errno.h>
#include <fdtdec.h>
#include <log.h>
#include <tmu.h>
#include <asm/arch/tmu.h>
#include <asm/arch/power.h>

#define TRIMINFO_RELOAD		1
#define CORE_EN			1
#define THERM_TRIP_EN		(1 << 12)

#define INTEN_RISE0		1
#define INTEN_RISE1		(1 << 4)
#define INTEN_RISE2		(1 << 8)
#define INTEN_FALL0		(1 << 16)
#define INTEN_FALL1		(1 << 20)
#define INTEN_FALL2		(1 << 24)

#define TRIM_INFO_MASK		0xff

#define INTCLEAR_RISE0		1
#define INTCLEAR_RISE1		(1 << 4)
#define INTCLEAR_RISE2		(1 << 8)
#define INTCLEAR_FALL0		(1 << 16)
#define INTCLEAR_FALL1		(1 << 20)
#define INTCLEAR_FALL2		(1 << 24)
#define INTCLEARALL		(INTCLEAR_RISE0 | INTCLEAR_RISE1 | \
				 INTCLEAR_RISE2 | INTCLEAR_FALL0 | \
				 INTCLEAR_FALL1 | INTCLEAR_FALL2)

/* Tmeperature threshold values for various thermal events */
struct temperature_params {
	/* minimum value in temperature code range */
	unsigned min_val;
	/* maximum value in temperature code range */
	unsigned max_val;
	/* temperature threshold to start warning */
	unsigned start_warning;
	/* temperature threshold CPU tripping */
	unsigned start_tripping;
	/* temperature threshold for HW tripping */
	unsigned hardware_tripping;
};

/* Pre-defined values and thresholds for calibration of current temperature */
struct tmu_data {
	/* pre-defined temperature thresholds */
	struct temperature_params ts;
	/* pre-defined efuse range minimum value */
	unsigned efuse_min_value;
	/* pre-defined efuse value for temperature calibration */
	unsigned efuse_value;
	/* pre-defined efuse range maximum value */
	unsigned efuse_max_value;
	/* current temperature sensing slope */
	unsigned slope;
};

/* TMU device specific details and status */
struct tmu_info {
	/* base Address for the TMU */
	struct exynos5_tmu_reg *tmu_base;
	/* mux Address for the TMU */
	int tmu_mux;
	/* pre-defined values for calibration and thresholds */
	struct tmu_data data;
	/* value required for triminfo_25 calibration */
	unsigned te1;
	/* value required for triminfo_85 calibration */
	unsigned te2;
	/* Value for measured data calibration */
	int dc_value;
	/* enum value indicating status of the TMU */
	int tmu_state;
};

/* Global struct tmu_info variable to store init values */
static struct tmu_info gbl_info;

/*
 * Get current temperature code from register,
 * then calculate and calibrate it's value
 * in degree celsius.
 *
 * @return	current temperature of the chip as sensed by TMU
 */
static int get_cur_temp(struct tmu_info *info)
{
	struct exynos5_tmu_reg *reg = info->tmu_base;
	ulong start;
	int cur_temp = 0;

	/*
	 * Temperature code range between min 25 and max 125.
	 * May run more than once for first call as initial sensing
	 * has not yet happened.
	 */
	if (info->tmu_state == TMU_STATUS_NORMAL) {
		start = get_timer(0);
		do {
			cur_temp = readl(&reg->current_temp) & 0xff;
		} while ((cur_temp == 0) || (get_timer(start) > 100));
	}

	if (cur_temp == 0)
		return cur_temp;

	/* Calibrate current temperature */
	cur_temp = cur_temp - info->te1 + info->dc_value;

	return cur_temp;
}

/*
 * Monitors status of the TMU device and exynos temperature
 *
 * @param temp	pointer to the current temperature value
 * @return	enum tmu_status_t value, code indicating event to execute
 */
enum tmu_status_t tmu_monitor(int *temp)
{
	int cur_temp;
	struct tmu_data *data = &gbl_info.data;

	if (gbl_info.tmu_state == TMU_STATUS_INIT)
		return TMU_STATUS_INIT;

	/* Read current temperature of the SOC */
	cur_temp = get_cur_temp(&gbl_info);

	if (!cur_temp)
		goto out;

	*temp = cur_temp;

	/* Temperature code lies between min 25 and max 125 */
	if ((cur_temp >= data->ts.start_tripping) &&
	    (cur_temp <= data->ts.max_val))
		return TMU_STATUS_TRIPPED;

	if (cur_temp >= data->ts.start_warning)
		return TMU_STATUS_WARNING;

	if ((cur_temp < data->ts.start_warning) &&
	    (cur_temp >= data->ts.min_val))
		return TMU_STATUS_NORMAL;

 out:
	/* Temperature code does not lie between min 25 and max 125 */
	gbl_info.tmu_state = TMU_STATUS_INIT;
	debug("EXYNOS_TMU: Thermal reading failed\n");
	return TMU_STATUS_INIT;
}

/*
 * Get TMU specific pre-defined values from FDT
 *
 * @param info	pointer to the tmu_info struct
 * @param blob  FDT blob
 * @return	int value, 0 for success
 */
static int get_tmu_fdt_values(struct tmu_info *info, const void *blob)
{
#if CONFIG_IS_ENABLED(OF_CONTROL)
	fdt_addr_t addr;
	int node;
	int error = 0;

	/* Get the node from FDT for TMU */
	node = fdtdec_next_compatible(blob, 0,
				      COMPAT_SAMSUNG_EXYNOS_TMU);
	if (node < 0) {
		debug("EXYNOS_TMU: No node for tmu in device tree\n");
		return -ENODEV;
	}

	/*
	 * Get the pre-defined TMU specific values from FDT.
	 * All of these are expected to be correct otherwise
	 * miscalculation of register values in tmu_setup_parameters
	 * may result in misleading current temperature.
	 */
	addr = fdtdec_get_addr(blob, node, "reg");
	if (addr == FDT_ADDR_T_NONE) {
		debug("%s: Missing tmu-base\n", __func__);
		return -ENODEV;
	}
	info->tmu_base = (struct exynos5_tmu_reg *)addr;

	/* Optional field. */
	info->tmu_mux = fdtdec_get_int(blob,
				node, "samsung,mux", -1);
	/* Take default value as per the user manual b(110) */
	if (info->tmu_mux == -1)
		info->tmu_mux = 0x6;

	info->data.ts.min_val = fdtdec_get_int(blob,
				node, "samsung,min-temp", -1);
	error |= (info->data.ts.min_val == -1);
	info->data.ts.max_val = fdtdec_get_int(blob,
				node, "samsung,max-temp", -1);
	error |= (info->data.ts.max_val == -1);
	info->data.ts.start_warning = fdtdec_get_int(blob,
				node, "samsung,start-warning", -1);
	error |= (info->data.ts.start_warning == -1);
	info->data.ts.start_tripping = fdtdec_get_int(blob,
				node, "samsung,start-tripping", -1);
	error |= (info->data.ts.start_tripping == -1);
	info->data.ts.hardware_tripping = fdtdec_get_int(blob,
				node, "samsung,hw-tripping", -1);
	error |= (info->data.ts.hardware_tripping == -1);
	info->data.efuse_min_value = fdtdec_get_int(blob,
				node, "samsung,efuse-min-value", -1);
	error |= (info->data.efuse_min_value == -1);
	info->data.efuse_value = fdtdec_get_int(blob,
				node, "samsung,efuse-value", -1);
	error |= (info->data.efuse_value == -1);
	info->data.efuse_max_value = fdtdec_get_int(blob,
				node, "samsung,efuse-max-value", -1);
	error |= (info->data.efuse_max_value == -1);
	info->data.slope = fdtdec_get_int(blob,
				node, "samsung,slope", -1);
	error |= (info->data.slope == -1);
	info->dc_value = fdtdec_get_int(blob,
				node, "samsung,dc-value", -1);
	error |= (info->dc_value == -1);

	if (error) {
		debug("fail to get tmu node properties\n");
		return -EINVAL;
	}
#else
	/* Non DT support may never be added. Just in case  */
	return -ENODEV;
#endif

	return 0;
}

/*
 * Calibrate and calculate threshold values and
 * enable interrupt levels
 *
 * @param	info pointer to the tmu_info struct
 */
static void tmu_setup_parameters(struct tmu_info *info)
{
	unsigned te_code, con;
	unsigned warning_code, trip_code, hwtrip_code;
	unsigned cooling_temp;
	unsigned rising_value;
	struct tmu_data *data = &info->data;
	struct exynos5_tmu_reg *reg = info->tmu_base;

	/* Must reload for reading efuse value from triminfo register */
	writel(TRIMINFO_RELOAD, &reg->triminfo_control);

	/* Get the compensation parameter */
	te_code = readl(&reg->triminfo);
	info->te1 = te_code & TRIM_INFO_MASK;
	info->te2 = ((te_code >> 8) & TRIM_INFO_MASK);

	if ((data->efuse_min_value > info->te1) ||
			(info->te1 > data->efuse_max_value)
			||  (info->te2 != 0))
		info->te1 = data->efuse_value;

	/* Get RISING & FALLING Threshold value */
	warning_code = data->ts.start_warning
			+ info->te1 - info->dc_value;
	trip_code = data->ts.start_tripping
			+ info->te1 - info->dc_value;
	hwtrip_code = data->ts.hardware_tripping
			+ info->te1 - info->dc_value;

	cooling_temp = 0;

	rising_value = ((warning_code << 8) |
			(trip_code << 16) |
			(hwtrip_code << 24));

	/* Set interrupt level */
	writel(rising_value, &reg->threshold_temp_rise);
	writel(cooling_temp, &reg->threshold_temp_fall);

	/*
	 * Init TMU control tuning parameters
	 * [28:24] VREF - Voltage reference
	 * [15:13] THERM_TRIP_MODE - Tripping mode
	 * [12] THERM_TRIP_EN - Thermal tripping enable
	 * [11:8] BUF_SLOPE_SEL - Gain of amplifier
	 * [6] THERM_TRIP_BY_TQ_EN - Tripping by TQ pin
	 */
	writel(data->slope, &reg->tmu_control);

	writel(INTCLEARALL, &reg->intclear);

	/* TMU core enable */
	con = readl(&reg->tmu_control);
	con |= THERM_TRIP_EN | CORE_EN | (info->tmu_mux << 20);

	writel(con, &reg->tmu_control);

	/* Enable HW thermal trip */
	set_hw_thermal_trip();

	/* LEV1 LEV2 interrupt enable */
	writel(INTEN_RISE1 | INTEN_RISE2, &reg->inten);
}

/*
 * Initialize TMU device
 *
 * @param blob  FDT blob
 * @return	int value, 0 for success
 */
int tmu_init(const void *blob)
{
	gbl_info.tmu_state = TMU_STATUS_INIT;
	if (get_tmu_fdt_values(&gbl_info, blob) < 0)
		goto ret;

	tmu_setup_parameters(&gbl_info);
	gbl_info.tmu_state = TMU_STATUS_NORMAL;
ret:
	return gbl_info.tmu_state;
}