xref: /linux/drivers/thermal/intel/intel_quark_dts_thermal.c (revision 66e72a01b60ae6950ddbb3585fdc1424d303e14b)
1 /*
2  * intel_quark_dts_thermal.c
3  *
4  * This file is provided under a dual BSD/GPLv2 license.  When using or
5  * redistributing this file, you may do so under either license.
6  *
7  * GPL LICENSE SUMMARY
8  *
9  * Copyright(c) 2015 Intel Corporation.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of version 2 of the GNU General Public License as
13  * published by the Free Software Foundation.
14  *
15  * This program is distributed in the hope that it will be useful, but
16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * Contact Information:
21  *  Ong Boon Leong <boon.leong.ong@intel.com>
22  *  Intel Malaysia, Penang
23  *
24  * BSD LICENSE
25  *
26  * Copyright(c) 2015 Intel Corporation.
27  *
28  * Redistribution and use in source and binary forms, with or without
29  * modification, are permitted provided that the following conditions
30  * are met:
31  *
32  *   * Redistributions of source code must retain the above copyright
33  *     notice, this list of conditions and the following disclaimer.
34  *   * Redistributions in binary form must reproduce the above copyright
35  *     notice, this list of conditions and the following disclaimer in
36  *     the documentation and/or other materials provided with the
37  *     distribution.
38  *   * Neither the name of Intel Corporation nor the names of its
39  *     contributors may be used to endorse or promote products derived
40  *     from this software without specific prior written permission.
41  *
42  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
43  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
44  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
45  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
46  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
47  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
48  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
49  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
50  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
51  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
52  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
53  *
54  * Quark DTS thermal driver is implemented by referencing
55  * intel_soc_dts_thermal.c.
56  */
57 
58 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
59 
60 #include <linux/module.h>
61 #include <linux/slab.h>
62 #include <linux/interrupt.h>
63 #include <linux/thermal.h>
64 #include <asm/cpu_device_id.h>
65 #include <asm/iosf_mbi.h>
66 
67 /* DTS reset is programmed via QRK_MBI_UNIT_SOC */
68 #define QRK_DTS_REG_OFFSET_RESET	0x34
69 #define QRK_DTS_RESET_BIT		BIT(0)
70 
71 /* DTS enable is programmed via QRK_MBI_UNIT_RMU */
72 #define QRK_DTS_REG_OFFSET_ENABLE	0xB0
73 #define QRK_DTS_ENABLE_BIT		BIT(15)
74 
75 /* Temperature Register is read via QRK_MBI_UNIT_RMU */
76 #define QRK_DTS_REG_OFFSET_TEMP		0xB1
77 #define QRK_DTS_MASK_TEMP		0xFF
78 #define QRK_DTS_OFFSET_TEMP		0
79 #define QRK_DTS_OFFSET_REL_TEMP		16
80 #define QRK_DTS_TEMP_BASE		50
81 
82 /* Programmable Trip Point Register is configured via QRK_MBI_UNIT_RMU */
83 #define QRK_DTS_REG_OFFSET_PTPS		0xB2
84 #define QRK_DTS_MASK_TP_THRES		0xFF
85 #define QRK_DTS_SHIFT_TP		8
86 #define QRK_DTS_ID_TP_CRITICAL		0
87 #define QRK_DTS_ID_TP_HOT		1
88 #define QRK_DTS_SAFE_TP_THRES		105
89 
90 /* Thermal Sensor Register Lock */
91 #define QRK_DTS_REG_OFFSET_LOCK		0x71
92 #define QRK_DTS_LOCK_BIT		BIT(5)
93 
94 /* Quark DTS has 2 trip points: hot & catastrophic */
95 #define QRK_MAX_DTS_TRIPS	2
96 
97 #define DEFAULT_POLL_DELAY	2000
98 
99 struct soc_sensor_entry {
100 	bool locked;
101 	u32 store_ptps;
102 	u32 store_dts_enable;
103 	struct thermal_zone_device *tzone;
104 };
105 
106 static struct soc_sensor_entry *soc_dts;
107 
108 static int polling_delay = DEFAULT_POLL_DELAY;
109 module_param(polling_delay, int, 0644);
110 MODULE_PARM_DESC(polling_delay,
111 	"Polling interval for checking trip points (in milliseconds)");
112 
113 static DEFINE_MUTEX(dts_update_mutex);
114 
115 static int soc_dts_enable(struct thermal_zone_device *tzd)
116 {
117 	u32 out;
118 	struct soc_sensor_entry *aux_entry = thermal_zone_device_priv(tzd);
119 	int ret;
120 
121 	ret = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
122 			    QRK_DTS_REG_OFFSET_ENABLE, &out);
123 	if (ret)
124 		return ret;
125 
126 	if (out & QRK_DTS_ENABLE_BIT)
127 		return 0;
128 
129 	if (!aux_entry->locked) {
130 		out |= QRK_DTS_ENABLE_BIT;
131 		ret = iosf_mbi_write(QRK_MBI_UNIT_RMU, MBI_REG_WRITE,
132 				     QRK_DTS_REG_OFFSET_ENABLE, out);
133 		if (ret)
134 			return ret;
135 	} else {
136 		pr_info("DTS is locked. Cannot enable DTS\n");
137 		ret = -EPERM;
138 	}
139 
140 	return ret;
141 }
142 
143 static int soc_dts_disable(struct thermal_zone_device *tzd)
144 {
145 	u32 out;
146 	struct soc_sensor_entry *aux_entry = thermal_zone_device_priv(tzd);
147 	int ret;
148 
149 	ret = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
150 			    QRK_DTS_REG_OFFSET_ENABLE, &out);
151 	if (ret)
152 		return ret;
153 
154 	if (!(out & QRK_DTS_ENABLE_BIT))
155 		return 0;
156 
157 	if (!aux_entry->locked) {
158 		out &= ~QRK_DTS_ENABLE_BIT;
159 		ret = iosf_mbi_write(QRK_MBI_UNIT_RMU, MBI_REG_WRITE,
160 				     QRK_DTS_REG_OFFSET_ENABLE, out);
161 
162 		if (ret)
163 			return ret;
164 	} else {
165 		pr_info("DTS is locked. Cannot disable DTS\n");
166 		ret = -EPERM;
167 	}
168 
169 	return ret;
170 }
171 
172 static int get_trip_temp(int trip)
173 {
174 	int status, temp;
175 	u32 out;
176 
177 	mutex_lock(&dts_update_mutex);
178 	status = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
179 			       QRK_DTS_REG_OFFSET_PTPS, &out);
180 	mutex_unlock(&dts_update_mutex);
181 
182 	if (status)
183 		return THERMAL_TEMP_INVALID;
184 
185 	/*
186 	 * Thermal Sensor Programmable Trip Point Register has 8-bit
187 	 * fields for critical (catastrophic) and hot set trip point
188 	 * thresholds. The threshold value is always offset by its
189 	 * temperature base (50 degree Celsius).
190 	 */
191 	temp = (out >> (trip * QRK_DTS_SHIFT_TP)) & QRK_DTS_MASK_TP_THRES;
192 	temp -= QRK_DTS_TEMP_BASE;
193 
194 	return temp;
195 }
196 
197 static int update_trip_temp(struct soc_sensor_entry *aux_entry,
198 				int trip_index, int temp)
199 {
200 	u32 out;
201 	u32 temp_out;
202 	u32 store_ptps;
203 	int ret;
204 
205 	mutex_lock(&dts_update_mutex);
206 	if (aux_entry->locked) {
207 		ret = -EPERM;
208 		goto failed;
209 	}
210 
211 	ret = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
212 			    QRK_DTS_REG_OFFSET_PTPS, &store_ptps);
213 	if (ret)
214 		goto failed;
215 
216 	/*
217 	 * Protection against unsafe trip point thresdhold value.
218 	 * As Quark X1000 data-sheet does not provide any recommendation
219 	 * regarding the safe trip point threshold value to use, we choose
220 	 * the safe value according to the threshold value set by UEFI BIOS.
221 	 */
222 	if (temp > QRK_DTS_SAFE_TP_THRES)
223 		temp = QRK_DTS_SAFE_TP_THRES;
224 
225 	/*
226 	 * Thermal Sensor Programmable Trip Point Register has 8-bit
227 	 * fields for critical (catastrophic) and hot set trip point
228 	 * thresholds. The threshold value is always offset by its
229 	 * temperature base (50 degree Celsius).
230 	 */
231 	temp_out = temp + QRK_DTS_TEMP_BASE;
232 	out = (store_ptps & ~(QRK_DTS_MASK_TP_THRES <<
233 		(trip_index * QRK_DTS_SHIFT_TP)));
234 	out |= (temp_out & QRK_DTS_MASK_TP_THRES) <<
235 		(trip_index * QRK_DTS_SHIFT_TP);
236 
237 	ret = iosf_mbi_write(QRK_MBI_UNIT_RMU, MBI_REG_WRITE,
238 			     QRK_DTS_REG_OFFSET_PTPS, out);
239 
240 failed:
241 	mutex_unlock(&dts_update_mutex);
242 	return ret;
243 }
244 
245 static inline int sys_set_trip_temp(struct thermal_zone_device *tzd,
246 				    const struct thermal_trip *trip,
247 				    int temp)
248 {
249 	unsigned int trip_index;
250 
251 	switch (trip->type) {
252 	case THERMAL_TRIP_HOT:
253 		trip_index = QRK_DTS_ID_TP_HOT;
254 		break;
255 
256 	case THERMAL_TRIP_CRITICAL:
257 		trip_index = QRK_DTS_ID_TP_CRITICAL;
258 		break;
259 
260 	default:
261 		return -EINVAL;
262 	}
263 
264 	return update_trip_temp(thermal_zone_device_priv(tzd), trip_index, temp);
265 }
266 
267 static int sys_get_curr_temp(struct thermal_zone_device *tzd,
268 				int *temp)
269 {
270 	u32 out;
271 	int ret;
272 
273 	mutex_lock(&dts_update_mutex);
274 	ret = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
275 			    QRK_DTS_REG_OFFSET_TEMP, &out);
276 	mutex_unlock(&dts_update_mutex);
277 
278 	if (ret)
279 		return ret;
280 
281 	/*
282 	 * Thermal Sensor Temperature Register has 8-bit field
283 	 * for temperature value (offset by temperature base
284 	 * 50 degree Celsius).
285 	 */
286 	out = (out >> QRK_DTS_OFFSET_TEMP) & QRK_DTS_MASK_TEMP;
287 	*temp = out - QRK_DTS_TEMP_BASE;
288 
289 	return 0;
290 }
291 
292 static int sys_change_mode(struct thermal_zone_device *tzd,
293 			   enum thermal_device_mode mode)
294 {
295 	int ret;
296 
297 	mutex_lock(&dts_update_mutex);
298 	if (mode == THERMAL_DEVICE_ENABLED)
299 		ret = soc_dts_enable(tzd);
300 	else
301 		ret = soc_dts_disable(tzd);
302 	mutex_unlock(&dts_update_mutex);
303 
304 	return ret;
305 }
306 
307 static const struct thermal_zone_device_ops tzone_ops = {
308 	.get_temp = sys_get_curr_temp,
309 	.set_trip_temp = sys_set_trip_temp,
310 	.change_mode = sys_change_mode,
311 };
312 
313 static void free_soc_dts(struct soc_sensor_entry *aux_entry)
314 {
315 	if (aux_entry) {
316 		if (!aux_entry->locked) {
317 			mutex_lock(&dts_update_mutex);
318 			iosf_mbi_write(QRK_MBI_UNIT_RMU, MBI_REG_WRITE,
319 				       QRK_DTS_REG_OFFSET_ENABLE,
320 				       aux_entry->store_dts_enable);
321 
322 			iosf_mbi_write(QRK_MBI_UNIT_RMU, MBI_REG_WRITE,
323 				       QRK_DTS_REG_OFFSET_PTPS,
324 				       aux_entry->store_ptps);
325 			mutex_unlock(&dts_update_mutex);
326 		}
327 		thermal_zone_device_unregister(aux_entry->tzone);
328 		kfree(aux_entry);
329 	}
330 }
331 
332 static struct soc_sensor_entry *alloc_soc_dts(void)
333 {
334 	struct thermal_trip trips[QRK_MAX_DTS_TRIPS] = { 0 };
335 	struct soc_sensor_entry *aux_entry;
336 	int err;
337 	u32 out;
338 
339 	aux_entry = kzalloc(sizeof(*aux_entry), GFP_KERNEL);
340 	if (!aux_entry) {
341 		err = -ENOMEM;
342 		return ERR_PTR(-ENOMEM);
343 	}
344 
345 	/* Check if DTS register is locked */
346 	err = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
347 			    QRK_DTS_REG_OFFSET_LOCK, &out);
348 	if (err)
349 		goto err_ret;
350 
351 	aux_entry->locked = !!(out & QRK_DTS_LOCK_BIT);
352 
353 	/* Store DTS default state if DTS registers are not locked */
354 	if (!aux_entry->locked) {
355 		/* Store DTS default enable for restore on exit */
356 		err = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
357 				    QRK_DTS_REG_OFFSET_ENABLE,
358 				    &aux_entry->store_dts_enable);
359 		if (err)
360 			goto err_ret;
361 
362 		/* Store DTS default PTPS register for restore on exit */
363 		err = iosf_mbi_read(QRK_MBI_UNIT_RMU, MBI_REG_READ,
364 				    QRK_DTS_REG_OFFSET_PTPS,
365 				    &aux_entry->store_ptps);
366 		if (err)
367 			goto err_ret;
368 
369 		trips[QRK_DTS_ID_TP_CRITICAL].flags |= THERMAL_TRIP_FLAG_RW_TEMP;
370 		trips[QRK_DTS_ID_TP_HOT].flags |= THERMAL_TRIP_FLAG_RW_TEMP;
371 	}
372 
373 	trips[QRK_DTS_ID_TP_CRITICAL].temperature = get_trip_temp(QRK_DTS_ID_TP_CRITICAL);
374 	trips[QRK_DTS_ID_TP_CRITICAL].type = THERMAL_TRIP_CRITICAL;
375 
376 	trips[QRK_DTS_ID_TP_HOT].temperature = get_trip_temp(QRK_DTS_ID_TP_HOT);
377 	trips[QRK_DTS_ID_TP_HOT].type = THERMAL_TRIP_HOT;
378 
379 	aux_entry->tzone = thermal_zone_device_register_with_trips("quark_dts",
380 								   trips,
381 								   QRK_MAX_DTS_TRIPS,
382 								   aux_entry,
383 								   &tzone_ops,
384 								   NULL, 0, polling_delay);
385 	if (IS_ERR(aux_entry->tzone)) {
386 		err = PTR_ERR(aux_entry->tzone);
387 		goto err_ret;
388 	}
389 
390 	err = thermal_zone_device_enable(aux_entry->tzone);
391 	if (err)
392 		goto err_aux_status;
393 
394 	return aux_entry;
395 
396 err_aux_status:
397 	thermal_zone_device_unregister(aux_entry->tzone);
398 err_ret:
399 	kfree(aux_entry);
400 	return ERR_PTR(err);
401 }
402 
403 static const struct x86_cpu_id qrk_thermal_ids[] __initconst  = {
404 	X86_MATCH_VENDOR_FAM_MODEL(INTEL, 5, INTEL_FAM5_QUARK_X1000, NULL),
405 	{}
406 };
407 MODULE_DEVICE_TABLE(x86cpu, qrk_thermal_ids);
408 
409 static int __init intel_quark_thermal_init(void)
410 {
411 	if (!x86_match_cpu(qrk_thermal_ids) || !iosf_mbi_available())
412 		return -ENODEV;
413 
414 	soc_dts = alloc_soc_dts();
415 	if (IS_ERR(soc_dts))
416 		return PTR_ERR(soc_dts);
417 
418 	return 0;
419 }
420 
421 static void __exit intel_quark_thermal_exit(void)
422 {
423 	free_soc_dts(soc_dts);
424 }
425 
426 module_init(intel_quark_thermal_init)
427 module_exit(intel_quark_thermal_exit)
428 
429 MODULE_DESCRIPTION("Intel Quark DTS Thermal Driver");
430 MODULE_AUTHOR("Ong Boon Leong <boon.leong.ong@intel.com>");
431 MODULE_LICENSE("Dual BSD/GPL");
432