1 // SPDX-License-Identifier: GPL-2.0
3 * uniphier_thermal.c - Socionext UniPhier thermal driver
4 * Copyright 2014 Panasonic Corporation
5 * Copyright 2016-2017 Socionext Inc.
7 * Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
10 #include <linux/bitops.h>
11 #include <linux/interrupt.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/module.h>
15 #include <linux/of_device.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/thermal.h>
20 #include "thermal_core.h"
24 * addresses are the offset from .block_base
26 #define PVTCTLEN 0x0000
27 #define PVTCTLEN_EN BIT(0)
29 #define PVTCTLMODE 0x0004
30 #define PVTCTLMODE_MASK 0xf
31 #define PVTCTLMODE_TEMPMON 0x5
33 #define EMONREPEAT 0x0040
34 #define EMONREPEAT_ENDLESS BIT(24)
35 #define EMONREPEAT_PERIOD GENMASK(3, 0)
36 #define EMONREPEAT_PERIOD_1000000 0x9
40 * addresses are the offset from .map_base
42 #define PVTCTLSEL 0x0900
43 #define PVTCTLSEL_MASK GENMASK(2, 0)
44 #define PVTCTLSEL_MONITOR 0
46 #define SETALERT0 0x0910
47 #define SETALERT1 0x0914
48 #define SETALERT2 0x0918
49 #define SETALERT_TEMP_OVF (GENMASK(7, 0) << 16)
50 #define SETALERT_TEMP_OVF_VALUE(val) (((val) & GENMASK(7, 0)) << 16)
51 #define SETALERT_EN BIT(0)
53 #define PMALERTINTCTL 0x0920
54 #define PMALERTINTCTL_CLR(ch) BIT(4 * (ch) + 2)
55 #define PMALERTINTCTL_SET(ch) BIT(4 * (ch) + 1)
56 #define PMALERTINTCTL_EN(ch) BIT(4 * (ch) + 0)
57 #define PMALERTINTCTL_MASK (GENMASK(10, 8) | GENMASK(6, 4) | \
63 #define TMODCOEF 0x0e5c
65 #define TMODSETUP0_EN BIT(30)
66 #define TMODSETUP0_VAL(val) (((val) & GENMASK(13, 0)) << 16)
67 #define TMODSETUP1_EN BIT(15)
68 #define TMODSETUP1_VAL(val) ((val) & GENMASK(14, 0))
70 /* SoC critical temperature */
71 #define CRITICAL_TEMP_LIMIT (120 * 1000)
73 /* Max # of alert channels */
74 #define ALERT_CH_NUM 3
76 /* SoC specific thermal sensor data */
77 struct uniphier_tm_soc_data {
83 struct uniphier_tm_dev {
84 struct regmap *regmap;
86 bool alert_en[ALERT_CH_NUM];
87 struct thermal_zone_device *tz_dev;
88 const struct uniphier_tm_soc_data *data;
91 static int uniphier_tm_initialize_sensor(struct uniphier_tm_dev *tdev)
93 struct regmap *map = tdev->regmap;
99 regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
103 * Since SoC has a calibrated value that was set in advance,
104 * TMODCOEF shows non-zero and PVT refers the value internally.
106 * If TMODCOEF shows zero, the boards don't have the calibrated
107 * value, and the driver has to set default value from DT.
109 ret = regmap_read(map, tdev->data->map_base + TMODCOEF, &val);
113 /* look for the default values in DT */
114 ret = of_property_read_u32_array(tdev->dev->of_node,
115 "socionext,tmod-calibration",
117 ARRAY_SIZE(tmod_calib));
121 regmap_write(map, tdev->data->tmod_setup_addr,
122 TMODSETUP0_EN | TMODSETUP0_VAL(tmod_calib[0]) |
123 TMODSETUP1_EN | TMODSETUP1_VAL(tmod_calib[1]));
126 /* select temperature mode */
127 regmap_write_bits(map, tdev->data->block_base + PVTCTLMODE,
128 PVTCTLMODE_MASK, PVTCTLMODE_TEMPMON);
130 /* set monitoring period */
131 regmap_write_bits(map, tdev->data->block_base + EMONREPEAT,
132 EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD,
133 EMONREPEAT_ENDLESS | EMONREPEAT_PERIOD_1000000);
135 /* set monitor mode */
136 regmap_write_bits(map, tdev->data->map_base + PVTCTLSEL,
137 PVTCTLSEL_MASK, PVTCTLSEL_MONITOR);
142 static void uniphier_tm_set_alert(struct uniphier_tm_dev *tdev, u32 ch,
145 struct regmap *map = tdev->regmap;
147 /* set alert temperature */
148 regmap_write_bits(map, tdev->data->map_base + SETALERT0 + (ch << 2),
149 SETALERT_EN | SETALERT_TEMP_OVF,
151 SETALERT_TEMP_OVF_VALUE(temp / 1000));
154 static void uniphier_tm_enable_sensor(struct uniphier_tm_dev *tdev)
156 struct regmap *map = tdev->regmap;
160 for (i = 0; i < ALERT_CH_NUM; i++)
161 if (tdev->alert_en[i])
162 bits |= PMALERTINTCTL_EN(i);
164 /* enable alert interrupt */
165 regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
166 PMALERTINTCTL_MASK, bits);
169 regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
170 PVTCTLEN_EN, PVTCTLEN_EN);
172 usleep_range(700, 1500); /* The spec note says at least 700us */
175 static void uniphier_tm_disable_sensor(struct uniphier_tm_dev *tdev)
177 struct regmap *map = tdev->regmap;
179 /* disable alert interrupt */
180 regmap_write_bits(map, tdev->data->map_base + PMALERTINTCTL,
181 PMALERTINTCTL_MASK, 0);
184 regmap_write_bits(map, tdev->data->block_base + PVTCTLEN,
187 usleep_range(1000, 2000); /* The spec note says at least 1ms */
190 static int uniphier_tm_get_temp(void *data, int *out_temp)
192 struct uniphier_tm_dev *tdev = data;
193 struct regmap *map = tdev->regmap;
197 ret = regmap_read(map, tdev->data->map_base + TMOD, &temp);
201 /* MSB of the TMOD field is a sign bit */
202 *out_temp = sign_extend32(temp, TMOD_WIDTH - 1) * 1000;
207 static const struct thermal_zone_of_device_ops uniphier_of_thermal_ops = {
208 .get_temp = uniphier_tm_get_temp,
211 static void uniphier_tm_irq_clear(struct uniphier_tm_dev *tdev)
213 u32 mask = 0, bits = 0;
216 for (i = 0; i < ALERT_CH_NUM; i++) {
217 mask |= (PMALERTINTCTL_CLR(i) | PMALERTINTCTL_SET(i));
218 bits |= PMALERTINTCTL_CLR(i);
221 /* clear alert interrupt */
222 regmap_write_bits(tdev->regmap,
223 tdev->data->map_base + PMALERTINTCTL, mask, bits);
226 static irqreturn_t uniphier_tm_alarm_irq(int irq, void *_tdev)
228 struct uniphier_tm_dev *tdev = _tdev;
230 disable_irq_nosync(irq);
231 uniphier_tm_irq_clear(tdev);
233 return IRQ_WAKE_THREAD;
236 static irqreturn_t uniphier_tm_alarm_irq_thread(int irq, void *_tdev)
238 struct uniphier_tm_dev *tdev = _tdev;
240 thermal_zone_device_update(tdev->tz_dev, THERMAL_EVENT_UNSPECIFIED);
245 static int uniphier_tm_probe(struct platform_device *pdev)
247 struct device *dev = &pdev->dev;
248 struct regmap *regmap;
249 struct device_node *parent;
250 struct uniphier_tm_dev *tdev;
251 const struct thermal_trip *trips;
252 int i, ret, irq, ntrips, crit_temp = INT_MAX;
254 tdev = devm_kzalloc(dev, sizeof(*tdev), GFP_KERNEL);
259 tdev->data = of_device_get_match_data(dev);
260 if (WARN_ON(!tdev->data))
263 irq = platform_get_irq(pdev, 0);
267 /* get regmap from syscon node */
268 parent = of_get_parent(dev->of_node); /* parent should be syscon node */
269 regmap = syscon_node_to_regmap(parent);
271 if (IS_ERR(regmap)) {
272 dev_err(dev, "failed to get regmap (error %ld)\n",
274 return PTR_ERR(regmap);
276 tdev->regmap = regmap;
278 ret = uniphier_tm_initialize_sensor(tdev);
280 dev_err(dev, "failed to initialize sensor\n");
284 ret = devm_request_threaded_irq(dev, irq, uniphier_tm_alarm_irq,
285 uniphier_tm_alarm_irq_thread,
290 platform_set_drvdata(pdev, tdev);
292 tdev->tz_dev = devm_thermal_zone_of_sensor_register(dev, 0, tdev,
293 &uniphier_of_thermal_ops);
294 if (IS_ERR(tdev->tz_dev)) {
295 dev_err(dev, "failed to register sensor device\n");
296 return PTR_ERR(tdev->tz_dev);
299 /* get trip points */
300 trips = of_thermal_get_trip_points(tdev->tz_dev);
301 ntrips = of_thermal_get_ntrips(tdev->tz_dev);
302 if (ntrips > ALERT_CH_NUM) {
303 dev_err(dev, "thermal zone has too many trips\n");
307 /* set alert temperatures */
308 for (i = 0; i < ntrips; i++) {
309 if (trips[i].type == THERMAL_TRIP_CRITICAL &&
310 trips[i].temperature < crit_temp)
311 crit_temp = trips[i].temperature;
312 uniphier_tm_set_alert(tdev, i, trips[i].temperature);
313 tdev->alert_en[i] = true;
315 if (crit_temp > CRITICAL_TEMP_LIMIT) {
316 dev_err(dev, "critical trip is over limit(>%d), or not set\n",
317 CRITICAL_TEMP_LIMIT);
321 uniphier_tm_enable_sensor(tdev);
326 static int uniphier_tm_remove(struct platform_device *pdev)
328 struct uniphier_tm_dev *tdev = platform_get_drvdata(pdev);
331 uniphier_tm_disable_sensor(tdev);
336 static const struct uniphier_tm_soc_data uniphier_pxs2_tm_data = {
338 .block_base = 0xe000,
339 .tmod_setup_addr = 0xe904,
342 static const struct uniphier_tm_soc_data uniphier_ld20_tm_data = {
344 .block_base = 0xe800,
345 .tmod_setup_addr = 0xe938,
348 static const struct of_device_id uniphier_tm_dt_ids[] = {
350 .compatible = "socionext,uniphier-pxs2-thermal",
351 .data = &uniphier_pxs2_tm_data,
354 .compatible = "socionext,uniphier-ld20-thermal",
355 .data = &uniphier_ld20_tm_data,
358 .compatible = "socionext,uniphier-pxs3-thermal",
359 .data = &uniphier_ld20_tm_data,
363 MODULE_DEVICE_TABLE(of, uniphier_tm_dt_ids);
365 static struct platform_driver uniphier_tm_driver = {
366 .probe = uniphier_tm_probe,
367 .remove = uniphier_tm_remove,
369 .name = "uniphier-thermal",
370 .of_match_table = uniphier_tm_dt_ids,
373 module_platform_driver(uniphier_tm_driver);
375 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
376 MODULE_DESCRIPTION("UniPhier thermal driver");
377 MODULE_LICENSE("GPL v2");