1 // SPDX-License-Identifier: GPL-2.0-only
2 /* intel_pch_thermal.c - Intel PCH Thermal driver
3 *
4 * Copyright (c) 2015, Intel Corporation.
5 *
6 * Authors:
7 * Tushar Dave <tushar.n.dave@intel.com>
8 */
9
10 #include <linux/acpi.h>
11 #include <linux/delay.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/pci.h>
15 #include <linux/pm.h>
16 #include <linux/suspend.h>
17 #include <linux/thermal.h>
18 #include <linux/types.h>
19 #include <linux/units.h>
20
21 /* Intel PCH thermal Device IDs */
22 #define PCH_THERMAL_DID_HSW_1 0x9C24 /* Haswell PCH */
23 #define PCH_THERMAL_DID_HSW_2 0x8C24 /* Haswell PCH */
24 #define PCH_THERMAL_DID_WPT 0x9CA4 /* Wildcat Point */
25 #define PCH_THERMAL_DID_SKL 0x9D31 /* Skylake PCH */
26 #define PCH_THERMAL_DID_SKL_H 0xA131 /* Skylake PCH 100 series */
27 #define PCH_THERMAL_DID_CNL 0x9Df9 /* CNL PCH */
28 #define PCH_THERMAL_DID_CNL_H 0xA379 /* CNL-H PCH */
29 #define PCH_THERMAL_DID_CNL_LP 0x02F9 /* CNL-LP PCH */
30 #define PCH_THERMAL_DID_CML_H 0X06F9 /* CML-H PCH */
31 #define PCH_THERMAL_DID_LWB 0xA1B1 /* Lewisburg PCH */
32
33 /* Wildcat Point-LP PCH Thermal registers */
34 #define WPT_TEMP 0x0000 /* Temperature */
35 #define WPT_TSC 0x04 /* Thermal Sensor Control */
36 #define WPT_TSS 0x06 /* Thermal Sensor Status */
37 #define WPT_TSEL 0x08 /* Thermal Sensor Enable and Lock */
38 #define WPT_TSREL 0x0A /* Thermal Sensor Report Enable and Lock */
39 #define WPT_TSMIC 0x0C /* Thermal Sensor SMI Control */
40 #define WPT_CTT 0x0010 /* Catastrophic Trip Point */
41 #define WPT_TSPM 0x001C /* Thermal Sensor Power Management */
42 #define WPT_TAHV 0x0014 /* Thermal Alert High Value */
43 #define WPT_TALV 0x0018 /* Thermal Alert Low Value */
44 #define WPT_TL 0x00000040 /* Throttle Value */
45 #define WPT_PHL 0x0060 /* PCH Hot Level */
46 #define WPT_PHLC 0x62 /* PHL Control */
47 #define WPT_TAS 0x80 /* Thermal Alert Status */
48 #define WPT_TSPIEN 0x82 /* PCI Interrupt Event Enables */
49 #define WPT_TSGPEN 0x84 /* General Purpose Event Enables */
50
51 /* Wildcat Point-LP PCH Thermal Register bit definitions */
52 #define WPT_TEMP_TSR 0x01ff /* Temp TS Reading */
53 #define WPT_TSC_CPDE 0x01 /* Catastrophic Power-Down Enable */
54 #define WPT_TSS_TSDSS 0x10 /* Thermal Sensor Dynamic Shutdown Status */
55 #define WPT_TSS_GPES 0x08 /* GPE status */
56 #define WPT_TSEL_ETS 0x01 /* Enable TS */
57 #define WPT_TSEL_PLDB 0x80 /* TSEL Policy Lock-Down Bit */
58 #define WPT_TL_TOL 0x000001FF /* T0 Level */
59 #define WPT_TL_T1L 0x1ff00000 /* T1 Level */
60 #define WPT_TL_TTEN 0x20000000 /* TT Enable */
61
62 /* Resolution of 1/2 degree C and an offset of -50C */
63 #define PCH_TEMP_OFFSET (-50)
64 #define GET_WPT_TEMP(x) ((x) * MILLIDEGREE_PER_DEGREE / 2 + WPT_TEMP_OFFSET)
65 #define WPT_TEMP_OFFSET (PCH_TEMP_OFFSET * MILLIDEGREE_PER_DEGREE)
66 #define GET_PCH_TEMP(x) (((x) / 2) + PCH_TEMP_OFFSET)
67
68 /* Amount of time for each cooling delay, 100ms by default for now */
69 static unsigned int delay_timeout = 100;
70 module_param(delay_timeout, int, 0644);
71 MODULE_PARM_DESC(delay_timeout, "amount of time delay for each iteration.");
72
73 /* Number of iterations for cooling delay, 600 counts by default for now */
74 static unsigned int delay_cnt = 600;
75 module_param(delay_cnt, int, 0644);
76 MODULE_PARM_DESC(delay_cnt, "total number of iterations for time delay.");
77
78 static char driver_name[] = "Intel PCH thermal driver";
79
80 struct pch_thermal_device {
81 void __iomem *hw_base;
82 const struct pch_dev_ops *ops;
83 struct pci_dev *pdev;
84 struct thermal_zone_device *tzd;
85 int crt_trip_id;
86 unsigned long crt_temp;
87 int hot_trip_id;
88 unsigned long hot_temp;
89 int psv_trip_id;
90 unsigned long psv_temp;
91 bool bios_enabled;
92 };
93
94 #ifdef CONFIG_ACPI
95
96 /*
97 * On some platforms, there is a companion ACPI device, which adds
98 * passive trip temperature using _PSV method. There is no specific
99 * passive temperature setting in MMIO interface of this PCI device.
100 */
pch_wpt_add_acpi_psv_trip(struct pch_thermal_device * ptd,int * nr_trips)101 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
102 int *nr_trips)
103 {
104 struct acpi_device *adev;
105
106 ptd->psv_trip_id = -1;
107
108 adev = ACPI_COMPANION(&ptd->pdev->dev);
109 if (adev) {
110 unsigned long long r;
111 acpi_status status;
112
113 status = acpi_evaluate_integer(adev->handle, "_PSV", NULL,
114 &r);
115 if (ACPI_SUCCESS(status)) {
116 unsigned long trip_temp;
117
118 trip_temp = deci_kelvin_to_millicelsius(r);
119 if (trip_temp) {
120 ptd->psv_temp = trip_temp;
121 ptd->psv_trip_id = *nr_trips;
122 ++(*nr_trips);
123 }
124 }
125 }
126 }
127 #else
pch_wpt_add_acpi_psv_trip(struct pch_thermal_device * ptd,int * nr_trips)128 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
129 int *nr_trips)
130 {
131 ptd->psv_trip_id = -1;
132
133 }
134 #endif
135
pch_wpt_init(struct pch_thermal_device * ptd,int * nr_trips)136 static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
137 {
138 u8 tsel;
139 u16 trip_temp;
140
141 *nr_trips = 0;
142
143 /* Check if BIOS has already enabled thermal sensor */
144 if (WPT_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL)) {
145 ptd->bios_enabled = true;
146 goto read_trips;
147 }
148
149 tsel = readb(ptd->hw_base + WPT_TSEL);
150 /*
151 * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
152 * If so, thermal sensor cannot enable. Bail out.
153 */
154 if (tsel & WPT_TSEL_PLDB) {
155 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
156 return -ENODEV;
157 }
158
159 writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
160 if (!(WPT_TSEL_ETS & readb(ptd->hw_base + WPT_TSEL))) {
161 dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
162 return -ENODEV;
163 }
164
165 read_trips:
166 ptd->crt_trip_id = -1;
167 trip_temp = readw(ptd->hw_base + WPT_CTT);
168 trip_temp &= 0x1FF;
169 if (trip_temp) {
170 ptd->crt_temp = GET_WPT_TEMP(trip_temp);
171 ptd->crt_trip_id = 0;
172 ++(*nr_trips);
173 }
174
175 ptd->hot_trip_id = -1;
176 trip_temp = readw(ptd->hw_base + WPT_PHL);
177 trip_temp &= 0x1FF;
178 if (trip_temp) {
179 ptd->hot_temp = GET_WPT_TEMP(trip_temp);
180 ptd->hot_trip_id = *nr_trips;
181 ++(*nr_trips);
182 }
183
184 pch_wpt_add_acpi_psv_trip(ptd, nr_trips);
185
186 return 0;
187 }
188
pch_wpt_get_temp(struct pch_thermal_device * ptd,int * temp)189 static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp)
190 {
191 *temp = GET_WPT_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));
192
193 return 0;
194 }
195
196 /* Cool the PCH when it's overheat in .suspend_noirq phase */
pch_wpt_suspend(struct pch_thermal_device * ptd)197 static int pch_wpt_suspend(struct pch_thermal_device *ptd)
198 {
199 u8 tsel;
200 int pch_delay_cnt = 0;
201 u16 pch_thr_temp, pch_cur_temp;
202
203 /* Shutdown the thermal sensor if it is not enabled by BIOS */
204 if (!ptd->bios_enabled) {
205 tsel = readb(ptd->hw_base + WPT_TSEL);
206 writeb(tsel & 0xFE, ptd->hw_base + WPT_TSEL);
207 return 0;
208 }
209
210 /* Do not check temperature if it is not a S0ix capable platform */
211 #ifdef CONFIG_ACPI
212 if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
213 return 0;
214 #else
215 return 0;
216 #endif
217
218 /* Do not check temperature if it is not s2idle */
219 if (pm_suspend_via_firmware())
220 return 0;
221
222 /* Get the PCH temperature threshold value */
223 pch_thr_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TSPM));
224
225 /* Get the PCH current temperature value */
226 pch_cur_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));
227
228 /*
229 * If current PCH temperature is higher than configured PCH threshold
230 * value, run some delay loop with sleep to let the current temperature
231 * go down below the threshold value which helps to allow system enter
232 * lower power S0ix suspend state. Even after delay loop if PCH current
233 * temperature stays above threshold, notify the warning message
234 * which helps to indentify the reason why S0ix entry was rejected.
235 */
236 while (pch_delay_cnt < delay_cnt) {
237 if (pch_cur_temp < pch_thr_temp)
238 break;
239
240 if (pm_wakeup_pending()) {
241 dev_warn(&ptd->pdev->dev, "Wakeup event detected, abort cooling\n");
242 return 0;
243 }
244
245 pch_delay_cnt++;
246 dev_dbg(&ptd->pdev->dev,
247 "CPU-PCH current temp [%dC] higher than the threshold temp [%dC], sleep %d times for %d ms duration\n",
248 pch_cur_temp, pch_thr_temp, pch_delay_cnt, delay_timeout);
249 msleep(delay_timeout);
250 /* Read the PCH current temperature for next cycle. */
251 pch_cur_temp = GET_PCH_TEMP(WPT_TEMP_TSR & readw(ptd->hw_base + WPT_TEMP));
252 }
253
254 if (pch_cur_temp >= pch_thr_temp)
255 dev_warn(&ptd->pdev->dev,
256 "CPU-PCH is hot [%dC] after %d ms delay. S0ix might fail\n",
257 pch_cur_temp, pch_delay_cnt * delay_timeout);
258 else {
259 if (pch_delay_cnt)
260 dev_info(&ptd->pdev->dev,
261 "CPU-PCH is cool [%dC] after %d ms delay\n",
262 pch_cur_temp, pch_delay_cnt * delay_timeout);
263 else
264 dev_info(&ptd->pdev->dev,
265 "CPU-PCH is cool [%dC]\n",
266 pch_cur_temp);
267 }
268
269 return 0;
270 }
271
pch_wpt_resume(struct pch_thermal_device * ptd)272 static int pch_wpt_resume(struct pch_thermal_device *ptd)
273 {
274 u8 tsel;
275
276 if (ptd->bios_enabled)
277 return 0;
278
279 tsel = readb(ptd->hw_base + WPT_TSEL);
280
281 writeb(tsel | WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
282
283 return 0;
284 }
285
286 struct pch_dev_ops {
287 int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
288 int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
289 int (*suspend)(struct pch_thermal_device *ptd);
290 int (*resume)(struct pch_thermal_device *ptd);
291 };
292
293
294 /* dev ops for Wildcat Point */
295 static const struct pch_dev_ops pch_dev_ops_wpt = {
296 .hw_init = pch_wpt_init,
297 .get_temp = pch_wpt_get_temp,
298 .suspend = pch_wpt_suspend,
299 .resume = pch_wpt_resume,
300 };
301
pch_thermal_get_temp(struct thermal_zone_device * tzd,int * temp)302 static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
303 {
304 struct pch_thermal_device *ptd = tzd->devdata;
305
306 return ptd->ops->get_temp(ptd, temp);
307 }
308
pch_get_trip_type(struct thermal_zone_device * tzd,int trip,enum thermal_trip_type * type)309 static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
310 enum thermal_trip_type *type)
311 {
312 struct pch_thermal_device *ptd = tzd->devdata;
313
314 if (ptd->crt_trip_id == trip)
315 *type = THERMAL_TRIP_CRITICAL;
316 else if (ptd->hot_trip_id == trip)
317 *type = THERMAL_TRIP_HOT;
318 else if (ptd->psv_trip_id == trip)
319 *type = THERMAL_TRIP_PASSIVE;
320 else
321 return -EINVAL;
322
323 return 0;
324 }
325
pch_get_trip_temp(struct thermal_zone_device * tzd,int trip,int * temp)326 static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
327 {
328 struct pch_thermal_device *ptd = tzd->devdata;
329
330 if (ptd->crt_trip_id == trip)
331 *temp = ptd->crt_temp;
332 else if (ptd->hot_trip_id == trip)
333 *temp = ptd->hot_temp;
334 else if (ptd->psv_trip_id == trip)
335 *temp = ptd->psv_temp;
336 else
337 return -EINVAL;
338
339 return 0;
340 }
341
pch_critical(struct thermal_zone_device * tzd)342 static void pch_critical(struct thermal_zone_device *tzd)
343 {
344 dev_dbg(&tzd->device, "%s: critical temperature reached\n", tzd->type);
345 }
346
347 static struct thermal_zone_device_ops tzd_ops = {
348 .get_temp = pch_thermal_get_temp,
349 .get_trip_type = pch_get_trip_type,
350 .get_trip_temp = pch_get_trip_temp,
351 .critical = pch_critical,
352 };
353
354 enum board_ids {
355 board_hsw,
356 board_wpt,
357 board_skl,
358 board_cnl,
359 board_cml,
360 board_lwb,
361 };
362
363 static const struct board_info {
364 const char *name;
365 const struct pch_dev_ops *ops;
366 } board_info[] = {
367 [board_hsw] = {
368 .name = "pch_haswell",
369 .ops = &pch_dev_ops_wpt,
370 },
371 [board_wpt] = {
372 .name = "pch_wildcat_point",
373 .ops = &pch_dev_ops_wpt,
374 },
375 [board_skl] = {
376 .name = "pch_skylake",
377 .ops = &pch_dev_ops_wpt,
378 },
379 [board_cnl] = {
380 .name = "pch_cannonlake",
381 .ops = &pch_dev_ops_wpt,
382 },
383 [board_cml] = {
384 .name = "pch_cometlake",
385 .ops = &pch_dev_ops_wpt,
386 },
387 [board_lwb] = {
388 .name = "pch_lewisburg",
389 .ops = &pch_dev_ops_wpt,
390 },
391 };
392
intel_pch_thermal_probe(struct pci_dev * pdev,const struct pci_device_id * id)393 static int intel_pch_thermal_probe(struct pci_dev *pdev,
394 const struct pci_device_id *id)
395 {
396 enum board_ids board_id = id->driver_data;
397 const struct board_info *bi = &board_info[board_id];
398 struct pch_thermal_device *ptd;
399 int err;
400 int nr_trips;
401
402 ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
403 if (!ptd)
404 return -ENOMEM;
405
406 ptd->ops = bi->ops;
407
408 pci_set_drvdata(pdev, ptd);
409 ptd->pdev = pdev;
410
411 err = pci_enable_device(pdev);
412 if (err) {
413 dev_err(&pdev->dev, "failed to enable pci device\n");
414 return err;
415 }
416
417 err = pci_request_regions(pdev, driver_name);
418 if (err) {
419 dev_err(&pdev->dev, "failed to request pci region\n");
420 goto error_disable;
421 }
422
423 ptd->hw_base = pci_ioremap_bar(pdev, 0);
424 if (!ptd->hw_base) {
425 err = -ENOMEM;
426 dev_err(&pdev->dev, "failed to map mem base\n");
427 goto error_release;
428 }
429
430 err = ptd->ops->hw_init(ptd, &nr_trips);
431 if (err)
432 goto error_cleanup;
433
434 ptd->tzd = thermal_zone_device_register(bi->name, nr_trips, 0, ptd,
435 &tzd_ops, NULL, 0, 0);
436 if (IS_ERR(ptd->tzd)) {
437 dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
438 bi->name);
439 err = PTR_ERR(ptd->tzd);
440 goto error_cleanup;
441 }
442 err = thermal_zone_device_enable(ptd->tzd);
443 if (err)
444 goto err_unregister;
445
446 return 0;
447
448 err_unregister:
449 thermal_zone_device_unregister(ptd->tzd);
450 error_cleanup:
451 iounmap(ptd->hw_base);
452 error_release:
453 pci_release_regions(pdev);
454 error_disable:
455 pci_disable_device(pdev);
456 dev_err(&pdev->dev, "pci device failed to probe\n");
457 return err;
458 }
459
intel_pch_thermal_remove(struct pci_dev * pdev)460 static void intel_pch_thermal_remove(struct pci_dev *pdev)
461 {
462 struct pch_thermal_device *ptd = pci_get_drvdata(pdev);
463
464 thermal_zone_device_unregister(ptd->tzd);
465 iounmap(ptd->hw_base);
466 pci_set_drvdata(pdev, NULL);
467 pci_release_regions(pdev);
468 pci_disable_device(pdev);
469 }
470
intel_pch_thermal_suspend_noirq(struct device * device)471 static int intel_pch_thermal_suspend_noirq(struct device *device)
472 {
473 struct pch_thermal_device *ptd = dev_get_drvdata(device);
474
475 return ptd->ops->suspend(ptd);
476 }
477
intel_pch_thermal_resume(struct device * device)478 static int intel_pch_thermal_resume(struct device *device)
479 {
480 struct pch_thermal_device *ptd = dev_get_drvdata(device);
481
482 return ptd->ops->resume(ptd);
483 }
484
485 static const struct pci_device_id intel_pch_thermal_id[] = {
486 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_1),
487 .driver_data = board_hsw, },
488 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_HSW_2),
489 .driver_data = board_hsw, },
490 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT),
491 .driver_data = board_wpt, },
492 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL),
493 .driver_data = board_skl, },
494 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_SKL_H),
495 .driver_data = board_skl, },
496 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CNL),
497 .driver_data = board_cnl, },
498 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CNL_H),
499 .driver_data = board_cnl, },
500 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CNL_LP),
501 .driver_data = board_cnl, },
502 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_CML_H),
503 .driver_data = board_cml, },
504 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_LWB),
505 .driver_data = board_lwb, },
506 { 0, },
507 };
508 MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);
509
510 static const struct dev_pm_ops intel_pch_pm_ops = {
511 .suspend_noirq = intel_pch_thermal_suspend_noirq,
512 .resume = intel_pch_thermal_resume,
513 };
514
515 static struct pci_driver intel_pch_thermal_driver = {
516 .name = "intel_pch_thermal",
517 .id_table = intel_pch_thermal_id,
518 .probe = intel_pch_thermal_probe,
519 .remove = intel_pch_thermal_remove,
520 .driver.pm = &intel_pch_pm_ops,
521 };
522
523 module_pci_driver(intel_pch_thermal_driver);
524
525 MODULE_LICENSE("GPL v2");
526 MODULE_DESCRIPTION("Intel PCH Thermal driver");
527