summaryrefslogtreecommitdiff
path: root/drivers/thermal/intel/intel_pch_thermal.c
blob: f5be2c389351a9f2f1262677fec40ebaa4a52ad0 (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
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
// SPDX-License-Identifier: GPL-2.0-only
/* intel_pch_thermal.c - Intel PCH Thermal driver
 *
 * Copyright (c) 2015, Intel Corporation.
 *
 * Authors:
 *     Tushar Dave <tushar.n.dave@intel.com>
 */

#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/thermal.h>
#include <linux/types.h>
#include <linux/units.h>

/* Intel PCH thermal Device IDs */
#define PCH_THERMAL_DID_HSW_1	0x9C24 /* Haswell PCH */
#define PCH_THERMAL_DID_HSW_2	0x8C24 /* Haswell PCH */
#define PCH_THERMAL_DID_WPT	0x9CA4 /* Wildcat Point */
#define PCH_THERMAL_DID_SKL	0x9D31 /* Skylake PCH */
#define PCH_THERMAL_DID_SKL_H	0xA131 /* Skylake PCH 100 series */
#define PCH_THERMAL_DID_CNL	0x9Df9 /* CNL PCH */
#define PCH_THERMAL_DID_CNL_H	0xA379 /* CNL-H PCH */
#define PCH_THERMAL_DID_CNL_LP	0x02F9 /* CNL-LP PCH */
#define PCH_THERMAL_DID_CML_H	0X06F9 /* CML-H PCH */
#define PCH_THERMAL_DID_LWB	0xA1B1 /* Lewisburg PCH */
#define PCH_THERMAL_DID_WBG	0x8D24 /* Wellsburg PCH */

/* Wildcat Point-LP  PCH Thermal registers */
#define WPT_TEMP	0x0000	/* Temperature */
#define WPT_TSC	0x04	/* Thermal Sensor Control */
#define WPT_TSS	0x06	/* Thermal Sensor Status */
#define WPT_TSEL	0x08	/* Thermal Sensor Enable and Lock */
#define WPT_TSREL	0x0A	/* Thermal Sensor Report Enable and Lock */
#define WPT_TSMIC	0x0C	/* Thermal Sensor SMI Control */
#define WPT_CTT	0x0010	/* Catastrophic Trip Point */
#define WPT_TSPM	0x001C	/* Thermal Sensor Power Management */
#define WPT_TAHV	0x0014	/* Thermal Alert High Value */
#define WPT_TALV	0x0018	/* Thermal Alert Low Value */
#define WPT_TL		0x00000040	/* Throttle Value */
#define WPT_PHL	0x0060	/* PCH Hot Level */
#define WPT_PHLC	0x62	/* PHL Control */
#define WPT_TAS	0x80	/* Thermal Alert Status */
#define WPT_TSPIEN	0x82	/* PCI Interrupt Event Enables */
#define WPT_TSGPEN	0x84	/* General Purpose Event Enables */

/*  Wildcat Point-LP  PCH Thermal Register bit definitions */
#define WPT_TEMP_TSR	0x01ff	/* Temp TS Reading */
#define WPT_TSC_CPDE	0x01	/* Catastrophic Power-Down Enable */
#define WPT_TSS_TSDSS	0x10	/* Thermal Sensor Dynamic Shutdown Status */
#define WPT_TSS_GPES	0x08	/* GPE status */
#define WPT_TSEL_ETS	0x01    /* Enable TS */
#define WPT_TSEL_PLDB	0x80	/* TSEL Policy Lock-Down Bit */
#define WPT_TL_TOL	0x000001FF	/* T0 Level */
#define WPT_TL_T1L	0x1ff00000	/* T1 Level */
#define WPT_TL_TTEN	0x20000000	/* TT Enable */

/* Resolution of 1/2 degree C and an offset of -50C */
#define PCH_TEMP_OFFSET	(-50)
#define GET_WPT_TEMP(x)	((x) * MILLIDEGREE_PER_DEGREE / 2 + WPT_TEMP_OFFSET)
#define WPT_TEMP_OFFSET	(PCH_TEMP_OFFSET * MILLIDEGREE_PER_DEGREE)
#define GET_PCH_TEMP(x)	(((x) / 2) + PCH_TEMP_OFFSET)

#define PCH_MAX_TRIPS 3 /* critical, hot, passive */

/* Amount of time for each cooling delay, 100ms by default for now */
static unsigned int delay_timeout = 100;
module_param(delay_timeout, int, 0644);
MODULE_PARM_DESC(delay_timeout, "amount of time delay for each iteration.");

/* Number of iterations for cooling delay, 600 counts by default for now */
static unsigned int delay_cnt = 600;
module_param(delay_cnt, int, 0644);
MODULE_PARM_DESC(delay_cnt, "total number of iterations for time delay.");

static char driver_name[] = "Intel PCH thermal driver";

struct pch_thermal_device {
	void __iomem *hw_base;
	struct pci_dev *pdev;
	struct thermal_zone_device *tzd;
	bool bios_enabled;
};

#ifdef CONFIG_ACPI
/*
 * On some platforms, there is a companion ACPI device, which adds
 * passive trip temperature using _PSV method. There is no specific
 * passive temperature setting in MMIO interface of this PCI device.
 */
static int pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
				     struct thermal_trip *trip)
{
	struct acpi_device *adev;
	int temp;

	adev = ACPI_COMPANION(&ptd->pdev->dev);
	if (!adev)
		return 0;

	if (thermal_acpi_passive_trip_temp(adev, &temp) || temp <= 0)
		return 0;

	trip->type = THERMAL_TRIP_PASSIVE;
	trip->temperature = temp;
	return 1;
}
#else
static int pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
				     struct thermal_trip *trip)
{
	return 0;
}
#endif

static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
{
	struct pch_thermal_device *ptd = thermal_zone_device_priv(tzd);

	*temp = GET_WPT_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));
	return 0;
}

static void pch_critical(struct thermal_zone_device *tzd)
{
	dev_dbg(thermal_zone_device(tzd), "%s: critical temperature reached\n",
		thermal_zone_device_type(tzd));
}

static const struct thermal_zone_device_ops tzd_ops = {
	.get_temp = pch_thermal_get_temp,
	.critical = pch_critical,
};

enum pch_board_ids {
	PCH_BOARD_HSW = 0,
	PCH_BOARD_WPT,
	PCH_BOARD_SKL,
	PCH_BOARD_CNL,
	PCH_BOARD_CML,
	PCH_BOARD_LWB,
	PCH_BOARD_WBG,
};

static const char *board_names[] = {
	[PCH_BOARD_HSW] = "pch_haswell",
	[PCH_BOARD_WPT] = "pch_wildcat_point",
	[PCH_BOARD_SKL] = "pch_skylake",
	[PCH_BOARD_CNL] = "pch_cannonlake",
	[PCH_BOARD_CML] = "pch_cometlake",
	[PCH_BOARD_LWB] = "pch_lewisburg",
	[PCH_BOARD_WBG] = "pch_wellsburg",
};

static int intel_pch_thermal_probe(struct pci_dev *pdev,
				   const struct pci_device_id *id)
{
	struct thermal_trip ptd_trips[PCH_MAX_TRIPS] = { 0 };
	enum pch_board_ids board_id = id->driver_data;
	struct pch_thermal_device *ptd;
	int nr_trips = 0;
	u16 trip_temp;
	u8 tsel;
	int err;

	ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
	if (!ptd)
		return -ENOMEM;

	pci_set_drvdata(pdev, ptd);
	ptd->pdev = pdev;

	err = pci_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "failed to enable pci device\n");
		return err;
	}

	err = pci_request_regions(pdev, driver_name);
	if (err) {
		dev_err(&pdev->dev, "failed to request pci region\n");
		goto error_disable;
	}

	ptd->hw_base = pci_ioremap_bar(pdev, 0);
	if (!ptd->hw_base) {
		err = -ENOMEM;
		dev_err(&pdev->dev, "failed to map mem base\n");
		goto error_release;
	}

	/* Check if BIOS has already enabled thermal sensor */
	if (WPT_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL)) {
		ptd->bios_enabled = true;
		goto read_trips;
	}

	tsel = readb(ptd->hw_base + WPT_TSEL);
	/*
	 * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
	 * If so, thermal sensor cannot enable. Bail out.
	 */
	if (tsel & WPT_TSEL_PLDB) {
		dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
		err = -ENODEV;
		goto error_cleanup;
	}

	writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
	if (!(WPT_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL))) {
		dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
		err = -ENODEV;
		goto error_cleanup;
	}

read_trips:
	trip_temp = readw(ptd->hw_base + WPT_CTT);
	trip_temp &= 0x1FF;
	if (trip_temp) {
		ptd_trips[nr_trips].temperature = GET_WPT_TEMP(trip_temp);
		ptd_trips[nr_trips++].type = THERMAL_TRIP_CRITICAL;
	}

	trip_temp = readw(ptd->hw_base + WPT_PHL);
	trip_temp &= 0x1FF;
	if (trip_temp) {
		ptd_trips[nr_trips].temperature = GET_WPT_TEMP(trip_temp);
		ptd_trips[nr_trips++].type = THERMAL_TRIP_HOT;
	}

	nr_trips += pch_wpt_add_acpi_psv_trip(ptd, &ptd_trips[nr_trips]);

	ptd->tzd = thermal_zone_device_register_with_trips(board_names[board_id],
							   ptd_trips, nr_trips,
							   ptd, &tzd_ops,
							   NULL, 0, 0);
	if (IS_ERR(ptd->tzd)) {
		dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
			board_names[board_id]);
		err = PTR_ERR(ptd->tzd);
		goto error_cleanup;
	}
	err = thermal_zone_device_enable(ptd->tzd);
	if (err)
		goto err_unregister;

	return 0;

err_unregister:
	thermal_zone_device_unregister(ptd->tzd);
error_cleanup:
	iounmap(ptd->hw_base);
error_release:
	pci_release_regions(pdev);
error_disable:
	pci_disable_device(pdev);
	dev_err(&pdev->dev, "pci device failed to probe\n");
	return err;
}

static void intel_pch_thermal_remove(struct pci_dev *pdev)
{
	struct pch_thermal_device *ptd = pci_get_drvdata(pdev);

	thermal_zone_device_unregister(ptd->tzd);
	iounmap(ptd->hw_base);
	pci_set_drvdata(pdev, NULL);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
}

static int intel_pch_thermal_suspend_noirq(struct device *device)
{
	struct pch_thermal_device *ptd = dev_get_drvdata(device);
	u16 pch_thr_temp, pch_cur_temp;
	int pch_delay_cnt = 0;
	u8 tsel;

	/* Shutdown the thermal sensor if it is not enabled by BIOS */
	if (!ptd->bios_enabled) {
		tsel = readb(ptd->hw_base + WPT_TSEL);
		writeb(tsel & 0xFE, ptd->hw_base + WPT_TSEL);
		return 0;
	}

	/* Do not check temperature if it is not s2idle */
	if (pm_suspend_via_firmware())
		return 0;

	/* Get the PCH temperature threshold value */
	pch_thr_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TSPM));

	/* Get the PCH current temperature value */
	pch_cur_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));

	/*
	 * If current PCH temperature is higher than configured PCH threshold
	 * value, run some delay loop with sleep to let the current temperature
	 * go down below the threshold value which helps to allow system enter
	 * lower power S0ix suspend state. Even after delay loop if PCH current
	 * temperature stays above threshold, notify the warning message
	 * which helps to indentify the reason why S0ix entry was rejected.
	 */
	while (pch_delay_cnt < delay_cnt) {
		if (pch_cur_temp < pch_thr_temp)
			break;

		if (pm_wakeup_pending()) {
			dev_warn(&ptd->pdev->dev, "Wakeup event detected, abort cooling\n");
			return 0;
		}

		pch_delay_cnt++;
		dev_dbg(&ptd->pdev->dev,
			"CPU-PCH current temp [%dC] higher than the threshold temp [%dC], sleep %d times for %d ms duration\n",
			pch_cur_temp, pch_thr_temp, pch_delay_cnt, delay_timeout);
		msleep(delay_timeout);
		/* Read the PCH current temperature for next cycle. */
		pch_cur_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));
	}

	if (pch_cur_temp >= pch_thr_temp)
		dev_warn(&ptd->pdev->dev,
			"CPU-PCH is hot [%dC] after %d ms delay. S0ix might fail\n",
			pch_cur_temp, pch_delay_cnt * delay_timeout);
	else {
		if (pch_delay_cnt)
			dev_info(&ptd->pdev->dev,
				"CPU-PCH is cool [%dC] after %d ms delay\n",
				pch_cur_temp, pch_delay_cnt * delay_timeout);
		else
			dev_info(&ptd->pdev->dev,
				"CPU-PCH is cool [%dC]\n",
				pch_cur_temp);
	}

	return 0;
}

static int intel_pch_thermal_resume(struct device *device)
{
	struct pch_thermal_device *ptd = dev_get_drvdata(device);
	u8 tsel;

	if (ptd->bios_enabled)
		return 0;

	tsel = readb(ptd->hw_base + WPT_TSEL);

	writeb(tsel | WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);

	return 0;
}

static const struct pci_device_id intel_pch_thermal_id[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_1),
		.driver_data = PCH_BOARD_HSW, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_2),
		.driver_data = PCH_BOARD_HSW, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT),
		.driver_data = PCH_BOARD_WPT, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL),
		.driver_data = PCH_BOARD_SKL, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL_H),
		.driver_data = PCH_BOARD_SKL, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CNL),
		.driver_data = PCH_BOARD_CNL, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CNL_H),
		.driver_data = PCH_BOARD_CNL, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CNL_LP),
		.driver_data = PCH_BOARD_CNL, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CML_H),
		.driver_data = PCH_BOARD_CML, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_LWB),
		.driver_data = PCH_BOARD_LWB, },
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WBG),
		.driver_data = PCH_BOARD_WBG, },
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);

static const struct dev_pm_ops intel_pch_pm_ops = {
	.suspend_noirq = intel_pch_thermal_suspend_noirq,
	.resume = intel_pch_thermal_resume,
};

static struct pci_driver intel_pch_thermal_driver = {
	.name		= "intel_pch_thermal",
	.id_table	= intel_pch_thermal_id,
	.probe		= intel_pch_thermal_probe,
	.remove		= intel_pch_thermal_remove,
	.driver.pm	= &intel_pch_pm_ops,
};

module_pci_driver(intel_pch_thermal_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel PCH Thermal driver");