3 * Copyright (c) 2015, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/interrupt.h>
21 #include <asm/iosf_mbi.h>
22 #include "intel_soc_dts_iosf.h"
24 #define SOC_DTS_OFFSET_ENABLE 0xB0
25 #define SOC_DTS_OFFSET_TEMP 0xB1
27 #define SOC_DTS_OFFSET_PTPS 0xB2
28 #define SOC_DTS_OFFSET_PTTS 0xB3
29 #define SOC_DTS_OFFSET_PTTSS 0xB4
30 #define SOC_DTS_OFFSET_PTMC 0x80
31 #define SOC_DTS_TE_AUX0 0xB5
32 #define SOC_DTS_TE_AUX1 0xB6
34 #define SOC_DTS_AUX0_ENABLE_BIT BIT(0)
35 #define SOC_DTS_AUX1_ENABLE_BIT BIT(1)
36 #define SOC_DTS_CPU_MODULE0_ENABLE_BIT BIT(16)
37 #define SOC_DTS_CPU_MODULE1_ENABLE_BIT BIT(17)
38 #define SOC_DTS_TE_SCI_ENABLE BIT(9)
39 #define SOC_DTS_TE_SMI_ENABLE BIT(10)
40 #define SOC_DTS_TE_MSI_ENABLE BIT(11)
41 #define SOC_DTS_TE_APICA_ENABLE BIT(14)
42 #define SOC_DTS_PTMC_APIC_DEASSERT_BIT BIT(4)
44 /* DTS encoding for TJ MAX temperature */
45 #define SOC_DTS_TJMAX_ENCODING 0x7F
47 /* Only 2 out of 4 is allowed for OSPM */
48 #define SOC_MAX_DTS_TRIPS 2
50 /* Mask for two trips in status bits */
51 #define SOC_DTS_TRIP_MASK 0x03
54 #define SOC_MAX_DTS_SENSORS 2
56 static int get_tj_max(u32 *tj_max)
62 err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
66 val = (eax >> 16) & 0xff;
82 static int sys_get_trip_temp(struct thermal_zone_device *tzd, int trip,
87 struct intel_soc_dts_sensor_entry *dts;
88 struct intel_soc_dts_sensors *sensors;
91 sensors = dts->sensors;
92 mutex_lock(&sensors->dts_update_lock);
93 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
94 SOC_DTS_OFFSET_PTPS, &out);
95 mutex_unlock(&sensors->dts_update_lock);
99 out = (out >> (trip * 8)) & SOC_DTS_TJMAX_ENCODING;
103 *temp = sensors->tj_max - out * 1000;
108 static int update_trip_temp(struct intel_soc_dts_sensor_entry *dts,
109 int thres_index, int temp,
110 enum thermal_trip_type trip_type)
119 u32 int_enable_bit = SOC_DTS_TE_APICA_ENABLE;
120 struct intel_soc_dts_sensors *sensors = dts->sensors;
122 if (sensors->intr_type == INTEL_SOC_DTS_INTERRUPT_MSI)
123 int_enable_bit |= SOC_DTS_TE_MSI_ENABLE;
125 temp_out = (sensors->tj_max - temp) / 1000;
127 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
128 SOC_DTS_OFFSET_PTPS, &store_ptps);
132 out = (store_ptps & ~(0xFF << (thres_index * 8)));
133 out |= (temp_out & 0xFF) << (thres_index * 8);
134 status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
135 SOC_DTS_OFFSET_PTPS, out);
139 pr_debug("update_trip_temp PTPS = %x\n", out);
140 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
141 SOC_DTS_OFFSET_PTMC, &out);
143 goto err_restore_ptps;
147 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
148 SOC_DTS_TE_AUX0 + thres_index,
151 goto err_restore_ptmc;
153 store_te_out = te_out;
154 /* Enable for CPU module 0 and module 1 */
155 out |= (SOC_DTS_CPU_MODULE0_ENABLE_BIT |
156 SOC_DTS_CPU_MODULE1_ENABLE_BIT);
159 out |= SOC_DTS_AUX1_ENABLE_BIT;
161 out |= SOC_DTS_AUX0_ENABLE_BIT;
162 te_out |= int_enable_bit;
165 out &= ~SOC_DTS_AUX1_ENABLE_BIT;
167 out &= ~SOC_DTS_AUX0_ENABLE_BIT;
168 te_out &= ~int_enable_bit;
170 status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
171 SOC_DTS_OFFSET_PTMC, out);
173 goto err_restore_te_out;
175 status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
176 SOC_DTS_TE_AUX0 + thres_index,
179 goto err_restore_te_out;
181 dts->trip_types[thres_index] = trip_type;
185 iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
186 SOC_DTS_OFFSET_PTMC, store_te_out);
188 iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
189 SOC_DTS_OFFSET_PTMC, store_ptmc);
191 iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
192 SOC_DTS_OFFSET_PTPS, store_ptps);
193 /* Nothing we can do if restore fails */
198 static int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip,
201 struct intel_soc_dts_sensor_entry *dts = tzd->devdata;
202 struct intel_soc_dts_sensors *sensors = dts->sensors;
205 if (temp > sensors->tj_max)
208 mutex_lock(&sensors->dts_update_lock);
209 status = update_trip_temp(tzd->devdata, trip, temp,
210 dts->trip_types[trip]);
211 mutex_unlock(&sensors->dts_update_lock);
216 static int sys_get_trip_type(struct thermal_zone_device *tzd,
217 int trip, enum thermal_trip_type *type)
219 struct intel_soc_dts_sensor_entry *dts;
223 *type = dts->trip_types[trip];
228 static int sys_get_curr_temp(struct thermal_zone_device *tzd,
233 struct intel_soc_dts_sensor_entry *dts;
234 struct intel_soc_dts_sensors *sensors;
237 sensors = dts->sensors;
238 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
239 SOC_DTS_OFFSET_TEMP, &out);
243 out = (out & dts->temp_mask) >> dts->temp_shift;
244 out -= SOC_DTS_TJMAX_ENCODING;
245 *temp = sensors->tj_max - out * 1000;
250 static struct thermal_zone_device_ops tzone_ops = {
251 .get_temp = sys_get_curr_temp,
252 .get_trip_temp = sys_get_trip_temp,
253 .get_trip_type = sys_get_trip_type,
254 .set_trip_temp = sys_set_trip_temp,
257 static int soc_dts_enable(int id)
262 ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
263 SOC_DTS_OFFSET_ENABLE, &out);
267 if (!(out & BIT(id))) {
269 ret = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
270 SOC_DTS_OFFSET_ENABLE, out);
278 static void remove_dts_thermal_zone(struct intel_soc_dts_sensor_entry *dts)
281 iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
282 SOC_DTS_OFFSET_ENABLE, dts->store_status);
283 thermal_zone_device_unregister(dts->tzone);
287 static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
288 bool notification_support, int trip_cnt,
289 int read_only_trip_cnt)
298 /* Store status to restor on exit */
299 ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
300 SOC_DTS_OFFSET_ENABLE, &dts->store_status);
305 dts->temp_mask = 0x00FF << (id * 8);
306 dts->temp_shift = id * 8;
307 if (notification_support) {
308 trip_count = min(SOC_MAX_DTS_TRIPS, trip_cnt);
309 trip_mask = BIT(trip_count - read_only_trip_cnt) - 1;
312 /* Check if the writable trip we provide is not used by BIOS */
313 ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
314 SOC_DTS_OFFSET_PTPS, &store_ptps);
318 for (i = 0; i < trip_count; ++i) {
319 if (trip_mask & BIT(i))
320 if (store_ptps & (0xff << (i * 8)))
321 trip_mask &= ~BIT(i);
324 dts->trip_mask = trip_mask;
325 dts->trip_count = trip_count;
326 snprintf(name, sizeof(name), "soc_dts%d", id);
327 dts->tzone = thermal_zone_device_register(name,
332 if (IS_ERR(dts->tzone)) {
333 ret = PTR_ERR(dts->tzone);
337 ret = soc_dts_enable(id);
343 thermal_zone_device_unregister(dts->tzone);
348 int intel_soc_dts_iosf_add_read_only_critical_trip(
349 struct intel_soc_dts_sensors *sensors, int critical_offset)
353 for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
354 for (j = 0; j < sensors->soc_dts[i].trip_count; ++j) {
355 if (!(sensors->soc_dts[i].trip_mask & BIT(j))) {
356 return update_trip_temp(&sensors->soc_dts[i], j,
357 sensors->tj_max - critical_offset,
358 THERMAL_TRIP_CRITICAL);
365 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_add_read_only_critical_trip);
367 void intel_soc_dts_iosf_interrupt_handler(struct intel_soc_dts_sensors *sensors)
374 spin_lock_irqsave(&sensors->intr_notify_lock, flags);
376 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
377 SOC_DTS_OFFSET_PTMC, &ptmc_out);
378 ptmc_out |= SOC_DTS_PTMC_APIC_DEASSERT_BIT;
379 status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
380 SOC_DTS_OFFSET_PTMC, ptmc_out);
382 status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
383 SOC_DTS_OFFSET_PTTSS, &sticky_out);
384 pr_debug("status %d PTTSS %x\n", status, sticky_out);
385 if (sticky_out & SOC_DTS_TRIP_MASK) {
387 /* reset sticky bit */
388 status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
389 SOC_DTS_OFFSET_PTTSS, sticky_out);
390 spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
392 for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
393 pr_debug("TZD update for zone %d\n", i);
394 thermal_zone_device_update(sensors->soc_dts[i].tzone,
395 THERMAL_EVENT_UNSPECIFIED);
398 spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
400 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_interrupt_handler);
402 struct intel_soc_dts_sensors *intel_soc_dts_iosf_init(
403 enum intel_soc_dts_interrupt_type intr_type, int trip_count,
404 int read_only_trip_count)
406 struct intel_soc_dts_sensors *sensors;
412 if (!iosf_mbi_available())
413 return ERR_PTR(-ENODEV);
415 if (!trip_count || read_only_trip_count > trip_count)
416 return ERR_PTR(-EINVAL);
418 if (get_tj_max(&tj_max))
419 return ERR_PTR(-EINVAL);
421 sensors = kzalloc(sizeof(*sensors), GFP_KERNEL);
423 return ERR_PTR(-ENOMEM);
425 spin_lock_init(&sensors->intr_notify_lock);
426 mutex_init(&sensors->dts_update_lock);
427 sensors->intr_type = intr_type;
428 sensors->tj_max = tj_max;
429 if (intr_type == INTEL_SOC_DTS_INTERRUPT_NONE)
430 notification = false;
433 for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
434 sensors->soc_dts[i].sensors = sensors;
435 ret = add_dts_thermal_zone(i, &sensors->soc_dts[i],
436 notification, trip_count,
437 read_only_trip_count);
442 for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
443 ret = update_trip_temp(&sensors->soc_dts[i], 0, 0,
444 THERMAL_TRIP_PASSIVE);
446 goto err_remove_zone;
448 ret = update_trip_temp(&sensors->soc_dts[i], 1, 0,
449 THERMAL_TRIP_PASSIVE);
451 goto err_remove_zone;
456 for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i)
457 remove_dts_thermal_zone(&sensors->soc_dts[i]);
463 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_init);
465 void intel_soc_dts_iosf_exit(struct intel_soc_dts_sensors *sensors)
469 for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
470 update_trip_temp(&sensors->soc_dts[i], 0, 0, 0);
471 update_trip_temp(&sensors->soc_dts[i], 1, 0, 0);
472 remove_dts_thermal_zone(&sensors->soc_dts[i]);
476 EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_exit);
478 MODULE_LICENSE("GPL v2");