1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * intel_soc_dts_iosf.c
  4 * Copyright (c) 2015, Intel Corporation.
  5 */
  6
  7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8
  9#include <linux/bitops.h>
 10#include <linux/intel_tcc.h>
 11#include <linux/module.h>
 12#include <linux/slab.h>
 13#include <linux/interrupt.h>
 14#include <asm/iosf_mbi.h>
 15#include "intel_soc_dts_iosf.h"
 16
 17#define SOC_DTS_OFFSET_ENABLE		0xB0
 18#define SOC_DTS_OFFSET_TEMP		0xB1
 19
 20#define SOC_DTS_OFFSET_PTPS		0xB2
 21#define SOC_DTS_OFFSET_PTTS		0xB3
 22#define SOC_DTS_OFFSET_PTTSS		0xB4
 23#define SOC_DTS_OFFSET_PTMC		0x80
 24#define SOC_DTS_TE_AUX0			0xB5
 25#define SOC_DTS_TE_AUX1			0xB6
 26
 27#define SOC_DTS_AUX0_ENABLE_BIT		BIT(0)
 28#define SOC_DTS_AUX1_ENABLE_BIT		BIT(1)
 29#define SOC_DTS_CPU_MODULE0_ENABLE_BIT	BIT(16)
 30#define SOC_DTS_CPU_MODULE1_ENABLE_BIT	BIT(17)
 31#define SOC_DTS_TE_SCI_ENABLE		BIT(9)
 32#define SOC_DTS_TE_SMI_ENABLE		BIT(10)
 33#define SOC_DTS_TE_MSI_ENABLE		BIT(11)
 34#define SOC_DTS_TE_APICA_ENABLE		BIT(14)
 35#define SOC_DTS_PTMC_APIC_DEASSERT_BIT	BIT(4)
 36
 37/* DTS encoding for TJ MAX temperature */
 38#define SOC_DTS_TJMAX_ENCODING		0x7F
 39
 40/* Mask for two trips in status bits */
 41#define SOC_DTS_TRIP_MASK		0x03
 42
 43static int update_trip_temp(struct intel_soc_dts_sensors *sensors,
 44			    int thres_index, int temp)
 45{
 46	int status;
 47	u32 temp_out;
 48	u32 out;
 49	unsigned long update_ptps;
 50	u32 store_ptps;
 51	u32 store_ptmc;
 52	u32 store_te_out;
 53	u32 te_out;
 54	u32 int_enable_bit = SOC_DTS_TE_APICA_ENABLE;
 55
 56	if (sensors->intr_type == INTEL_SOC_DTS_INTERRUPT_MSI)
 57		int_enable_bit |= SOC_DTS_TE_MSI_ENABLE;
 58
 59	temp_out = (sensors->tj_max - temp) / 1000;
 60
 61	status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 62			       SOC_DTS_OFFSET_PTPS, &store_ptps);
 63	if (status)
 64		return status;
 65
 66	update_ptps = store_ptps;
 67	bitmap_set_value8(&update_ptps, temp_out & 0xFF, thres_index * 8);
 68	out = update_ptps;
 69
 70	status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
 71				SOC_DTS_OFFSET_PTPS, out);
 72	if (status)
 73		return status;
 74
 75	pr_debug("update_trip_temp PTPS = %x\n", out);
 76	status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 77			       SOC_DTS_OFFSET_PTMC, &out);
 78	if (status)
 79		goto err_restore_ptps;
 80
 81	store_ptmc = out;
 82
 83	status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
 84			       SOC_DTS_TE_AUX0 + thres_index,
 85			       &te_out);
 86	if (status)
 87		goto err_restore_ptmc;
 88
 89	store_te_out = te_out;
 90	/* Enable for CPU module 0 and module 1 */
 91	out |= (SOC_DTS_CPU_MODULE0_ENABLE_BIT |
 92					SOC_DTS_CPU_MODULE1_ENABLE_BIT);
 93	if (temp) {
 94		if (thres_index)
 95			out |= SOC_DTS_AUX1_ENABLE_BIT;
 96		else
 97			out |= SOC_DTS_AUX0_ENABLE_BIT;
 98		te_out |= int_enable_bit;
 99	} else {
100		if (thres_index)
101			out &= ~SOC_DTS_AUX1_ENABLE_BIT;
102		else
103			out &= ~SOC_DTS_AUX0_ENABLE_BIT;
104		te_out &= ~int_enable_bit;
105	}
106	status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
107				SOC_DTS_OFFSET_PTMC, out);
108	if (status)
109		goto err_restore_te_out;
110
111	status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
112				SOC_DTS_TE_AUX0 + thres_index,
113				te_out);
114	if (status)
115		goto err_restore_te_out;
116
117	return 0;
118err_restore_te_out:
119	iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
120		       SOC_DTS_OFFSET_PTMC, store_te_out);
121err_restore_ptmc:
122	iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
123		       SOC_DTS_OFFSET_PTMC, store_ptmc);
124err_restore_ptps:
125	iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
126		       SOC_DTS_OFFSET_PTPS, store_ptps);
127	/* Nothing we can do if restore fails */
128
129	return status;
130}
131
132static int sys_set_trip_temp(struct thermal_zone_device *tzd,
133			     const struct thermal_trip *trip,
134			     int temp)
135{
136	struct intel_soc_dts_sensor_entry *dts = thermal_zone_device_priv(tzd);
137	struct intel_soc_dts_sensors *sensors = dts->sensors;
138	unsigned int trip_index = THERMAL_TRIP_PRIV_TO_INT(trip->priv);
139	int status;
140
141	if (temp > sensors->tj_max)
142		return -EINVAL;
143
144	mutex_lock(&sensors->dts_update_lock);
145	status = update_trip_temp(sensors, trip_index, temp);
146	mutex_unlock(&sensors->dts_update_lock);
147
148	return status;
149}
150
151static int sys_get_curr_temp(struct thermal_zone_device *tzd,
152			     int *temp)
153{
154	int status;
155	u32 out;
156	struct intel_soc_dts_sensor_entry *dts = thermal_zone_device_priv(tzd);
157	struct intel_soc_dts_sensors *sensors;
158	unsigned long raw;
159
160	sensors = dts->sensors;
161	status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
162			       SOC_DTS_OFFSET_TEMP, &out);
163	if (status)
164		return status;
165
166	raw = out;
167	out = bitmap_get_value8(&raw, dts->id * 8) - SOC_DTS_TJMAX_ENCODING;
168	*temp = sensors->tj_max - out * 1000;
169
170	return 0;
171}
172
173static const struct thermal_zone_device_ops tzone_ops = {
174	.get_temp = sys_get_curr_temp,
175	.set_trip_temp = sys_set_trip_temp,
176};
177
178static int soc_dts_enable(int id)
179{
180	u32 out;
181	int ret;
182
183	ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
184			    SOC_DTS_OFFSET_ENABLE, &out);
185	if (ret)
186		return ret;
187
188	if (!(out & BIT(id))) {
189		out |= BIT(id);
190		ret = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
191				     SOC_DTS_OFFSET_ENABLE, out);
192		if (ret)
193			return ret;
194	}
195
196	return ret;
197}
198
199static void remove_dts_thermal_zone(struct intel_soc_dts_sensor_entry *dts)
200{
201	iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
202		       SOC_DTS_OFFSET_ENABLE, dts->store_status);
203	thermal_zone_device_unregister(dts->tzone);
204}
205
206static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
207				struct thermal_trip *trips)
208{
209	char name[10];
210	u32 store_ptps;
211	int ret;
212
213	/* Store status to restor on exit */
214	ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
215			    SOC_DTS_OFFSET_ENABLE, &dts->store_status);
216	if (ret)
217		goto err_ret;
218
219	dts->id = id;
220
221	/* Check if the writable trip we provide is not used by BIOS */
222	ret = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
223			    SOC_DTS_OFFSET_PTPS, &store_ptps);
224	if (!ret) {
225		int i;
226
227		for (i = 0; i <= 1; i++) {
228			if (store_ptps & (0xFFU << i * 8))
229				trips[i].flags &= ~THERMAL_TRIP_FLAG_RW_TEMP;
230		}
231	}
232	snprintf(name, sizeof(name), "soc_dts%d", id);
233	dts->tzone = thermal_zone_device_register_with_trips(name, trips,
234							     SOC_MAX_DTS_TRIPS,
235							     dts, &tzone_ops,
236							     NULL, 0, 0);
237	if (IS_ERR(dts->tzone)) {
238		ret = PTR_ERR(dts->tzone);
239		goto err_ret;
240	}
241	ret = thermal_zone_device_enable(dts->tzone);
242	if (ret)
243		goto err_enable;
244
245	ret = soc_dts_enable(id);
246	if (ret)
247		goto err_enable;
248
249	return 0;
250err_enable:
251	thermal_zone_device_unregister(dts->tzone);
252err_ret:
253	return ret;
254}
255
256void intel_soc_dts_iosf_interrupt_handler(struct intel_soc_dts_sensors *sensors)
257{
258	u32 sticky_out;
259	int status;
260	u32 ptmc_out;
261	unsigned long flags;
262
263	spin_lock_irqsave(&sensors->intr_notify_lock, flags);
264
265	status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
266			       SOC_DTS_OFFSET_PTMC, &ptmc_out);
267	ptmc_out |= SOC_DTS_PTMC_APIC_DEASSERT_BIT;
268	status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
269				SOC_DTS_OFFSET_PTMC, ptmc_out);
270
271	status = iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_REG_READ,
272			       SOC_DTS_OFFSET_PTTSS, &sticky_out);
273	pr_debug("status %d PTTSS %x\n", status, sticky_out);
274	if (sticky_out & SOC_DTS_TRIP_MASK) {
275		int i;
276		/* reset sticky bit */
277		status = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE,
278					SOC_DTS_OFFSET_PTTSS, sticky_out);
279		spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
280
281		for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
282			pr_debug("TZD update for zone %d\n", i);
283			thermal_zone_device_update(sensors->soc_dts[i].tzone,
284						   THERMAL_EVENT_UNSPECIFIED);
285		}
286	} else
287		spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
288}
289EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_interrupt_handler);
290
291static void dts_trips_reset(struct intel_soc_dts_sensors *sensors, int dts_index)
292{
293	update_trip_temp(sensors, 0, 0);
294	update_trip_temp(sensors, 1, 0);
295}
296
297static void set_trip(struct thermal_trip *trip, enum thermal_trip_type type,
298		     u8 flags, int temp, unsigned int index)
299{
300	trip->type = type;
301	trip->flags = flags;
302	trip->temperature = temp;
303	trip->priv = THERMAL_INT_TO_TRIP_PRIV(index);
304}
305
306struct intel_soc_dts_sensors *
307intel_soc_dts_iosf_init(enum intel_soc_dts_interrupt_type intr_type,
308			bool critical_trip, int crit_offset)
309{
310	struct thermal_trip trips[SOC_MAX_DTS_SENSORS][SOC_MAX_DTS_TRIPS] = { 0 };
311	struct intel_soc_dts_sensors *sensors;
312	int tj_max;
313	int ret;
314	int i;
315
316	if (!iosf_mbi_available())
317		return ERR_PTR(-ENODEV);
318
319	tj_max = intel_tcc_get_tjmax(-1);
320	if (tj_max < 0)
321		return ERR_PTR(tj_max);
322
323	sensors = kzalloc(sizeof(*sensors), GFP_KERNEL);
324	if (!sensors)
325		return ERR_PTR(-ENOMEM);
326
327	spin_lock_init(&sensors->intr_notify_lock);
328	mutex_init(&sensors->dts_update_lock);
329	sensors->intr_type = intr_type;
330	sensors->tj_max = tj_max * 1000;
331
332	for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
333		int temp;
334
335		sensors->soc_dts[i].sensors = sensors;
336
337		set_trip(&trips[i][0], THERMAL_TRIP_PASSIVE,
338			 THERMAL_TRIP_FLAG_RW_TEMP, 0, 0);
339
340		ret = update_trip_temp(sensors, 0, 0);
341		if (ret)
342			goto err_reset_trips;
343
344		if (critical_trip) {
345			temp = sensors->tj_max - crit_offset;
346			set_trip(&trips[i][1], THERMAL_TRIP_CRITICAL, 0, temp, 1);
347		} else {
348			set_trip(&trips[i][1], THERMAL_TRIP_PASSIVE,
349				 THERMAL_TRIP_FLAG_RW_TEMP, 0, 1);
350			temp = 0;
351		}
352
353		ret = update_trip_temp(sensors, 1, temp);
354		if (ret)
355			goto err_reset_trips;
356	}
357
358	for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
359		ret = add_dts_thermal_zone(i, &sensors->soc_dts[i], trips[i]);
360		if (ret)
361			goto err_remove_zone;
362	}
363
364	return sensors;
365
366err_remove_zone:
367	for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i)
368		remove_dts_thermal_zone(&sensors->soc_dts[i]);
369
370err_reset_trips:
371	for (i = 0; i < SOC_MAX_DTS_SENSORS; i++)
372		dts_trips_reset(sensors, i);
373
374	kfree(sensors);
375	return ERR_PTR(ret);
376}
377EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_init);
378
379void intel_soc_dts_iosf_exit(struct intel_soc_dts_sensors *sensors)
380{
381	int i;
382
383	for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
384		remove_dts_thermal_zone(&sensors->soc_dts[i]);
385		dts_trips_reset(sensors, i);
386	}
387	kfree(sensors);
388}
389EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_exit);
390
391MODULE_IMPORT_NS("INTEL_TCC");
392MODULE_LICENSE("GPL v2");
393MODULE_DESCRIPTION("SoC DTS driver using side band interface");