2 * intel_quark_dts_thermal.c
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.
9 * Copyright(c) 2015 Intel Corporation.
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.
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.
20 * Contact Information:
21 * Ong Boon Leong <boon.leong.ong@intel.com>
22 * Intel Malaysia, Penang
26 * Copyright(c) 2015 Intel Corporation.
28 * Redistribution and use in source and binary forms, with or without
29 * modification, are permitted provided that the following conditions
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
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.
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.
54 * Quark DTS thermal driver is implemented by referencing
55 * intel_soc_dts_thermal.c.
58 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
67 #define X86_FAMILY_QUARK 0x5
68 #define X86_MODEL_QUARK_X1000 0x9
70 /* DTS reset is programmed via QRK_MBI_UNIT_SOC */
71 #define QRK_DTS_REG_OFFSET_RESET 0x34
72 #define QRK_DTS_RESET_BIT BIT(0)
74 /* DTS enable is programmed via QRK_MBI_UNIT_RMU */
75 #define QRK_DTS_REG_OFFSET_ENABLE 0xB0
76 #define QRK_DTS_ENABLE_BIT BIT(15)
78 /* Temperature Register is read via QRK_MBI_UNIT_RMU */
79 #define QRK_DTS_REG_OFFSET_TEMP 0xB1
80 #define QRK_DTS_MASK_TEMP 0xFF
81 #define QRK_DTS_OFFSET_TEMP 0
82 #define QRK_DTS_OFFSET_REL_TEMP 16
83 #define QRK_DTS_TEMP_BASE 50
85 /* Programmable Trip Point Register is configured via QRK_MBI_UNIT_RMU */
86 #define QRK_DTS_REG_OFFSET_PTPS 0xB2
87 #define QRK_DTS_MASK_TP_THRES 0xFF
88 #define QRK_DTS_SHIFT_TP 8
89 #define QRK_DTS_ID_TP_CRITICAL 0
90 #define QRK_DTS_SAFE_TP_THRES 105
92 /* Thermal Sensor Register Lock */
93 #define QRK_DTS_REG_OFFSET_LOCK 0x71
94 #define QRK_DTS_LOCK_BIT BIT(5)
96 /* Quark DTS has 2 trip points: hot & catastrophic */
97 #define QRK_MAX_DTS_TRIPS 2
98 /* If DTS not locked, all trip points are configurable */
99 #define QRK_DTS_WR_MASK_SET 0x3
100 /* If DTS locked, all trip points are not configurable */
101 #define QRK_DTS_WR_MASK_CLR 0
103 #define DEFAULT_POLL_DELAY 2000
105 struct soc_sensor_entry {
108 u32 store_dts_enable;
109 enum thermal_device_mode mode;
110 struct thermal_zone_device *tzone;
113 static struct soc_sensor_entry *soc_dts;
115 static int polling_delay = DEFAULT_POLL_DELAY;
116 module_param(polling_delay, int, 0644);
117 MODULE_PARM_DESC(polling_delay,
118 "Polling interval for checking trip points (in milliseconds)");
120 static DEFINE_MUTEX(dts_update_mutex);
122 static int soc_dts_enable(struct thermal_zone_device *tzd)
125 struct soc_sensor_entry *aux_entry = tzd->devdata;
128 ret = iosf_mbi_read(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_READ,
129 QRK_DTS_REG_OFFSET_ENABLE, &out);
133 if (out & QRK_DTS_ENABLE_BIT) {
134 aux_entry->mode = THERMAL_DEVICE_ENABLED;
138 if (!aux_entry->locked) {
139 out |= QRK_DTS_ENABLE_BIT;
140 ret = iosf_mbi_write(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_WRITE,
141 QRK_DTS_REG_OFFSET_ENABLE, out);
145 aux_entry->mode = THERMAL_DEVICE_ENABLED;
147 aux_entry->mode = THERMAL_DEVICE_DISABLED;
148 pr_info("DTS is locked. Cannot enable DTS\n");
155 static int soc_dts_disable(struct thermal_zone_device *tzd)
158 struct soc_sensor_entry *aux_entry = tzd->devdata;
161 ret = iosf_mbi_read(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_READ,
162 QRK_DTS_REG_OFFSET_ENABLE, &out);
166 if (!(out & QRK_DTS_ENABLE_BIT)) {
167 aux_entry->mode = THERMAL_DEVICE_DISABLED;
171 if (!aux_entry->locked) {
172 out &= ~QRK_DTS_ENABLE_BIT;
173 ret = iosf_mbi_write(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_WRITE,
174 QRK_DTS_REG_OFFSET_ENABLE, out);
179 aux_entry->mode = THERMAL_DEVICE_DISABLED;
181 aux_entry->mode = THERMAL_DEVICE_ENABLED;
182 pr_info("DTS is locked. Cannot disable DTS\n");
189 static int _get_trip_temp(int trip, int *temp)
194 mutex_lock(&dts_update_mutex);
195 status = iosf_mbi_read(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_READ,
196 QRK_DTS_REG_OFFSET_PTPS, &out);
197 mutex_unlock(&dts_update_mutex);
203 * Thermal Sensor Programmable Trip Point Register has 8-bit
204 * fields for critical (catastrophic) and hot set trip point
205 * thresholds. The threshold value is always offset by its
206 * temperature base (50 degree Celsius).
208 *temp = (out >> (trip * QRK_DTS_SHIFT_TP)) & QRK_DTS_MASK_TP_THRES;
209 *temp -= QRK_DTS_TEMP_BASE;
214 static inline int sys_get_trip_temp(struct thermal_zone_device *tzd,
217 return _get_trip_temp(trip, temp);
220 static inline int sys_get_crit_temp(struct thermal_zone_device *tzd, int *temp)
222 return _get_trip_temp(QRK_DTS_ID_TP_CRITICAL, temp);
225 static int update_trip_temp(struct soc_sensor_entry *aux_entry,
233 mutex_lock(&dts_update_mutex);
234 if (aux_entry->locked) {
239 ret = iosf_mbi_read(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_READ,
240 QRK_DTS_REG_OFFSET_PTPS, &store_ptps);
245 * Protection against unsafe trip point thresdhold value.
246 * As Quark X1000 data-sheet does not provide any recommendation
247 * regarding the safe trip point threshold value to use, we choose
248 * the safe value according to the threshold value set by UEFI BIOS.
250 if (temp > QRK_DTS_SAFE_TP_THRES)
251 temp = QRK_DTS_SAFE_TP_THRES;
254 * Thermal Sensor Programmable Trip Point Register has 8-bit
255 * fields for critical (catastrophic) and hot set trip point
256 * thresholds. The threshold value is always offset by its
257 * temperature base (50 degree Celsius).
259 temp_out = temp + QRK_DTS_TEMP_BASE;
260 out = (store_ptps & ~(QRK_DTS_MASK_TP_THRES <<
261 (trip * QRK_DTS_SHIFT_TP)));
262 out |= (temp_out & QRK_DTS_MASK_TP_THRES) <<
263 (trip * QRK_DTS_SHIFT_TP);
265 ret = iosf_mbi_write(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_WRITE,
266 QRK_DTS_REG_OFFSET_PTPS, out);
269 mutex_unlock(&dts_update_mutex);
273 static inline int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip,
276 return update_trip_temp(tzd->devdata, trip, temp);
279 static int sys_get_trip_type(struct thermal_zone_device *thermal,
280 int trip, enum thermal_trip_type *type)
283 *type = THERMAL_TRIP_HOT;
285 *type = THERMAL_TRIP_CRITICAL;
290 static int sys_get_curr_temp(struct thermal_zone_device *tzd,
296 mutex_lock(&dts_update_mutex);
297 ret = iosf_mbi_read(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_READ,
298 QRK_DTS_REG_OFFSET_TEMP, &out);
299 mutex_unlock(&dts_update_mutex);
305 * Thermal Sensor Temperature Register has 8-bit field
306 * for temperature value (offset by temperature base
307 * 50 degree Celsius).
309 out = (out >> QRK_DTS_OFFSET_TEMP) & QRK_DTS_MASK_TEMP;
310 *temp = out - QRK_DTS_TEMP_BASE;
315 static int sys_get_mode(struct thermal_zone_device *tzd,
316 enum thermal_device_mode *mode)
318 struct soc_sensor_entry *aux_entry = tzd->devdata;
319 *mode = aux_entry->mode;
323 static int sys_set_mode(struct thermal_zone_device *tzd,
324 enum thermal_device_mode mode)
328 mutex_lock(&dts_update_mutex);
329 if (mode == THERMAL_DEVICE_ENABLED)
330 ret = soc_dts_enable(tzd);
332 ret = soc_dts_disable(tzd);
333 mutex_unlock(&dts_update_mutex);
338 static struct thermal_zone_device_ops tzone_ops = {
339 .get_temp = sys_get_curr_temp,
340 .get_trip_temp = sys_get_trip_temp,
341 .get_trip_type = sys_get_trip_type,
342 .set_trip_temp = sys_set_trip_temp,
343 .get_crit_temp = sys_get_crit_temp,
344 .get_mode = sys_get_mode,
345 .set_mode = sys_set_mode,
348 static void free_soc_dts(struct soc_sensor_entry *aux_entry)
351 if (!aux_entry->locked) {
352 mutex_lock(&dts_update_mutex);
353 iosf_mbi_write(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_WRITE,
354 QRK_DTS_REG_OFFSET_ENABLE,
355 aux_entry->store_dts_enable);
357 iosf_mbi_write(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_WRITE,
358 QRK_DTS_REG_OFFSET_PTPS,
359 aux_entry->store_ptps);
360 mutex_unlock(&dts_update_mutex);
362 thermal_zone_device_unregister(aux_entry->tzone);
367 static struct soc_sensor_entry *alloc_soc_dts(void)
369 struct soc_sensor_entry *aux_entry;
374 aux_entry = kzalloc(sizeof(*aux_entry), GFP_KERNEL);
377 return ERR_PTR(-ENOMEM);
380 /* Check if DTS register is locked */
381 err = iosf_mbi_read(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_READ,
382 QRK_DTS_REG_OFFSET_LOCK,
387 if (out & QRK_DTS_LOCK_BIT) {
388 aux_entry->locked = true;
389 wr_mask = QRK_DTS_WR_MASK_CLR;
391 aux_entry->locked = false;
392 wr_mask = QRK_DTS_WR_MASK_SET;
395 /* Store DTS default state if DTS registers are not locked */
396 if (!aux_entry->locked) {
397 /* Store DTS default enable for restore on exit */
398 err = iosf_mbi_read(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_READ,
399 QRK_DTS_REG_OFFSET_ENABLE,
400 &aux_entry->store_dts_enable);
404 /* Store DTS default PTPS register for restore on exit */
405 err = iosf_mbi_read(QRK_MBI_UNIT_RMU, QRK_MBI_RMU_READ,
406 QRK_DTS_REG_OFFSET_PTPS,
407 &aux_entry->store_ptps);
412 aux_entry->tzone = thermal_zone_device_register("quark_dts",
415 aux_entry, &tzone_ops, NULL, 0, polling_delay);
416 if (IS_ERR(aux_entry->tzone)) {
417 err = PTR_ERR(aux_entry->tzone);
421 mutex_lock(&dts_update_mutex);
422 err = soc_dts_enable(aux_entry->tzone);
423 mutex_unlock(&dts_update_mutex);
430 thermal_zone_device_unregister(aux_entry->tzone);
436 static const struct x86_cpu_id qrk_thermal_ids[] __initconst = {
437 { X86_VENDOR_INTEL, X86_FAMILY_QUARK, X86_MODEL_QUARK_X1000 },
440 MODULE_DEVICE_TABLE(x86cpu, qrk_thermal_ids);
442 static int __init intel_quark_thermal_init(void)
446 if (!x86_match_cpu(qrk_thermal_ids) || !iosf_mbi_available())
449 soc_dts = alloc_soc_dts();
450 if (IS_ERR(soc_dts)) {
451 err = PTR_ERR(soc_dts);
458 free_soc_dts(soc_dts);
462 static void __exit intel_quark_thermal_exit(void)
464 free_soc_dts(soc_dts);
467 module_init(intel_quark_thermal_init)
468 module_exit(intel_quark_thermal_exit)
470 MODULE_DESCRIPTION("Intel Quark DTS Thermal Driver");
471 MODULE_AUTHOR("Ong Boon Leong <boon.leong.ong@intel.com>");
472 MODULE_LICENSE("Dual BSD/GPL");