Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-2.6-microblaze.git] / drivers / thermal / rcar_gen3_thermal.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  R-Car Gen3 THS thermal sensor driver
4  *  Based on rcar_thermal.c and work from Hien Dang and Khiem Nguyen.
5  *
6  * Copyright (C) 2016 Renesas Electronics Corporation.
7  * Copyright (C) 2016 Sang Engineering
8  */
9 #include <linux/delay.h>
10 #include <linux/err.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/of_device.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/sys_soc.h>
18 #include <linux/thermal.h>
19
20 #include "thermal_core.h"
21 #include "thermal_hwmon.h"
22
23 /* Register offsets */
24 #define REG_GEN3_IRQSTR         0x04
25 #define REG_GEN3_IRQMSK         0x08
26 #define REG_GEN3_IRQCTL         0x0C
27 #define REG_GEN3_IRQEN          0x10
28 #define REG_GEN3_IRQTEMP1       0x14
29 #define REG_GEN3_IRQTEMP2       0x18
30 #define REG_GEN3_IRQTEMP3       0x1C
31 #define REG_GEN3_CTSR           0x20
32 #define REG_GEN3_THCTR          0x20
33 #define REG_GEN3_TEMP           0x28
34 #define REG_GEN3_THCODE1        0x50
35 #define REG_GEN3_THCODE2        0x54
36 #define REG_GEN3_THCODE3        0x58
37
38 /* IRQ{STR,MSK,EN} bits */
39 #define IRQ_TEMP1               BIT(0)
40 #define IRQ_TEMP2               BIT(1)
41 #define IRQ_TEMP3               BIT(2)
42 #define IRQ_TEMPD1              BIT(3)
43 #define IRQ_TEMPD2              BIT(4)
44 #define IRQ_TEMPD3              BIT(5)
45
46 /* CTSR bits */
47 #define CTSR_PONM       BIT(8)
48 #define CTSR_AOUT       BIT(7)
49 #define CTSR_THBGR      BIT(5)
50 #define CTSR_VMEN       BIT(4)
51 #define CTSR_VMST       BIT(1)
52 #define CTSR_THSST      BIT(0)
53
54 /* THCTR bits */
55 #define THCTR_PONM      BIT(6)
56 #define THCTR_THSST     BIT(0)
57
58 #define CTEMP_MASK      0xFFF
59
60 #define MCELSIUS(temp)  ((temp) * 1000)
61 #define GEN3_FUSE_MASK  0xFFF
62
63 #define TSC_MAX_NUM     4
64
65 /* default THCODE values if FUSEs are missing */
66 static const int thcodes[TSC_MAX_NUM][3] = {
67         { 3397, 2800, 2221 },
68         { 3393, 2795, 2216 },
69         { 3389, 2805, 2237 },
70         { 3415, 2694, 2195 },
71 };
72
73 /* Structure for thermal temperature calculation */
74 struct equation_coefs {
75         int a1;
76         int b1;
77         int a2;
78         int b2;
79 };
80
81 struct rcar_gen3_thermal_tsc {
82         void __iomem *base;
83         struct thermal_zone_device *zone;
84         struct equation_coefs coef;
85         int tj_t;
86         int id; /* thermal channel id */
87 };
88
89 struct rcar_gen3_thermal_priv {
90         struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
91         unsigned int num_tscs;
92         void (*thermal_init)(struct rcar_gen3_thermal_tsc *tsc);
93 };
94
95 static inline u32 rcar_gen3_thermal_read(struct rcar_gen3_thermal_tsc *tsc,
96                                          u32 reg)
97 {
98         return ioread32(tsc->base + reg);
99 }
100
101 static inline void rcar_gen3_thermal_write(struct rcar_gen3_thermal_tsc *tsc,
102                                            u32 reg, u32 data)
103 {
104         iowrite32(data, tsc->base + reg);
105 }
106
107 /*
108  * Linear approximation for temperature
109  *
110  * [reg] = [temp] * a + b => [temp] = ([reg] - b) / a
111  *
112  * The constants a and b are calculated using two triplets of int values PTAT
113  * and THCODE. PTAT and THCODE can either be read from hardware or use hard
114  * coded values from driver. The formula to calculate a and b are taken from
115  * BSP and sparsely documented and understood.
116  *
117  * Examining the linear formula and the formula used to calculate constants a
118  * and b while knowing that the span for PTAT and THCODE values are between
119  * 0x000 and 0xfff the largest integer possible is 0xfff * 0xfff == 0xffe001.
120  * Integer also needs to be signed so that leaves 7 bits for binary
121  * fixed point scaling.
122  */
123
124 #define FIXPT_SHIFT 7
125 #define FIXPT_INT(_x) ((_x) << FIXPT_SHIFT)
126 #define INT_FIXPT(_x) ((_x) >> FIXPT_SHIFT)
127 #define FIXPT_DIV(_a, _b) DIV_ROUND_CLOSEST(((_a) << FIXPT_SHIFT), (_b))
128 #define FIXPT_TO_MCELSIUS(_x) ((_x) * 1000 >> FIXPT_SHIFT)
129
130 #define RCAR3_THERMAL_GRAN 500 /* mili Celsius */
131
132 /* no idea where these constants come from */
133 #define TJ_3 -41
134
135 static void rcar_gen3_thermal_calc_coefs(struct rcar_gen3_thermal_tsc *tsc,
136                                          int *ptat, const int *thcode,
137                                          int ths_tj_1)
138 {
139         /* TODO: Find documentation and document constant calculation formula */
140
141         /*
142          * Division is not scaled in BSP and if scaled it might overflow
143          * the dividend (4095 * 4095 << 14 > INT_MAX) so keep it unscaled
144          */
145         tsc->tj_t = (FIXPT_INT((ptat[1] - ptat[2]) * 157)
146                      / (ptat[0] - ptat[2])) + FIXPT_INT(TJ_3);
147
148         tsc->coef.a1 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[2]),
149                                  tsc->tj_t - FIXPT_INT(TJ_3));
150         tsc->coef.b1 = FIXPT_INT(thcode[2]) - tsc->coef.a1 * TJ_3;
151
152         tsc->coef.a2 = FIXPT_DIV(FIXPT_INT(thcode[1] - thcode[0]),
153                                  tsc->tj_t - FIXPT_INT(ths_tj_1));
154         tsc->coef.b2 = FIXPT_INT(thcode[0]) - tsc->coef.a2 * ths_tj_1;
155 }
156
157 static int rcar_gen3_thermal_round(int temp)
158 {
159         int result, round_offs;
160
161         round_offs = temp >= 0 ? RCAR3_THERMAL_GRAN / 2 :
162                 -RCAR3_THERMAL_GRAN / 2;
163         result = (temp + round_offs) / RCAR3_THERMAL_GRAN;
164         return result * RCAR3_THERMAL_GRAN;
165 }
166
167 static int rcar_gen3_thermal_get_temp(void *devdata, int *temp)
168 {
169         struct rcar_gen3_thermal_tsc *tsc = devdata;
170         int mcelsius, val;
171         int reg;
172
173         /* Read register and convert to mili Celsius */
174         reg = rcar_gen3_thermal_read(tsc, REG_GEN3_TEMP) & CTEMP_MASK;
175
176         if (reg <= thcodes[tsc->id][1])
177                 val = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b1,
178                                 tsc->coef.a1);
179         else
180                 val = FIXPT_DIV(FIXPT_INT(reg) - tsc->coef.b2,
181                                 tsc->coef.a2);
182         mcelsius = FIXPT_TO_MCELSIUS(val);
183
184         /* Guaranteed operating range is -40C to 125C. */
185
186         /* Round value to device granularity setting */
187         *temp = rcar_gen3_thermal_round(mcelsius);
188
189         return 0;
190 }
191
192 static const struct thermal_zone_of_device_ops rcar_gen3_tz_of_ops = {
193         .get_temp       = rcar_gen3_thermal_get_temp,
194 };
195
196 static const struct soc_device_attribute r8a7795es1[] = {
197         { .soc_id = "r8a7795", .revision = "ES1.*" },
198         { /* sentinel */ }
199 };
200
201 static void rcar_gen3_thermal_init_r8a7795es1(struct rcar_gen3_thermal_tsc *tsc)
202 {
203         rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,  CTSR_THBGR);
204         rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,  0x0);
205
206         usleep_range(1000, 2000);
207
208         rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR, CTSR_PONM);
209
210         rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0x3F);
211         rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
212
213         rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
214                                 CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN);
215
216         usleep_range(100, 200);
217
218         rcar_gen3_thermal_write(tsc, REG_GEN3_CTSR,
219                                 CTSR_PONM | CTSR_AOUT | CTSR_THBGR | CTSR_VMEN |
220                                 CTSR_VMST | CTSR_THSST);
221
222         usleep_range(1000, 2000);
223 }
224
225 static void rcar_gen3_thermal_init(struct rcar_gen3_thermal_tsc *tsc)
226 {
227         u32 reg_val;
228
229         reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
230         reg_val &= ~THCTR_PONM;
231         rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
232
233         usleep_range(1000, 2000);
234
235         rcar_gen3_thermal_write(tsc, REG_GEN3_IRQCTL, 0);
236         rcar_gen3_thermal_write(tsc, REG_GEN3_IRQMSK, 0);
237
238         reg_val = rcar_gen3_thermal_read(tsc, REG_GEN3_THCTR);
239         reg_val |= THCTR_THSST;
240         rcar_gen3_thermal_write(tsc, REG_GEN3_THCTR, reg_val);
241
242         usleep_range(1000, 2000);
243 }
244
245 static const int rcar_gen3_ths_tj_1 = 126;
246 static const int rcar_gen3_ths_tj_1_m3_w = 116;
247 static const struct of_device_id rcar_gen3_thermal_dt_ids[] = {
248         {
249                 .compatible = "renesas,r8a774a1-thermal",
250                 .data = &rcar_gen3_ths_tj_1_m3_w,
251         },
252         {
253                 .compatible = "renesas,r8a774b1-thermal",
254                 .data = &rcar_gen3_ths_tj_1,
255         },
256         {
257                 .compatible = "renesas,r8a774e1-thermal",
258                 .data = &rcar_gen3_ths_tj_1,
259         },
260         {
261                 .compatible = "renesas,r8a7795-thermal",
262                 .data = &rcar_gen3_ths_tj_1,
263         },
264         {
265                 .compatible = "renesas,r8a7796-thermal",
266                 .data = &rcar_gen3_ths_tj_1_m3_w,
267         },
268         {
269                 .compatible = "renesas,r8a77961-thermal",
270                 .data = &rcar_gen3_ths_tj_1_m3_w,
271         },
272         {
273                 .compatible = "renesas,r8a77965-thermal",
274                 .data = &rcar_gen3_ths_tj_1,
275         },
276         {
277                 .compatible = "renesas,r8a77980-thermal",
278                 .data = &rcar_gen3_ths_tj_1,
279         },
280         {
281                 .compatible = "renesas,r8a779a0-thermal",
282                 .data = &rcar_gen3_ths_tj_1,
283         },
284         {},
285 };
286 MODULE_DEVICE_TABLE(of, rcar_gen3_thermal_dt_ids);
287
288 static int rcar_gen3_thermal_remove(struct platform_device *pdev)
289 {
290         struct device *dev = &pdev->dev;
291
292         pm_runtime_put(dev);
293         pm_runtime_disable(dev);
294
295         return 0;
296 }
297
298 static void rcar_gen3_hwmon_action(void *data)
299 {
300         struct thermal_zone_device *zone = data;
301
302         thermal_remove_hwmon_sysfs(zone);
303 }
304
305 static int rcar_gen3_thermal_probe(struct platform_device *pdev)
306 {
307         struct rcar_gen3_thermal_priv *priv;
308         struct device *dev = &pdev->dev;
309         const int *rcar_gen3_ths_tj_1 = of_device_get_match_data(dev);
310         struct resource *res;
311         struct thermal_zone_device *zone;
312         int ret, i;
313
314         /* default values if FUSEs are missing */
315         /* TODO: Read values from hardware on supported platforms */
316         int ptat[3] = { 2631, 1509, 435 };
317
318         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
319         if (!priv)
320                 return -ENOMEM;
321
322         priv->thermal_init = rcar_gen3_thermal_init;
323         if (soc_device_match(r8a7795es1))
324                 priv->thermal_init = rcar_gen3_thermal_init_r8a7795es1;
325
326         platform_set_drvdata(pdev, priv);
327
328         pm_runtime_enable(dev);
329         pm_runtime_get_sync(dev);
330
331         for (i = 0; i < TSC_MAX_NUM; i++) {
332                 struct rcar_gen3_thermal_tsc *tsc;
333
334                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
335                 if (!res)
336                         break;
337
338                 tsc = devm_kzalloc(dev, sizeof(*tsc), GFP_KERNEL);
339                 if (!tsc) {
340                         ret = -ENOMEM;
341                         goto error_unregister;
342                 }
343
344                 tsc->base = devm_ioremap_resource(dev, res);
345                 if (IS_ERR(tsc->base)) {
346                         ret = PTR_ERR(tsc->base);
347                         goto error_unregister;
348                 }
349                 tsc->id = i;
350
351                 priv->tscs[i] = tsc;
352
353                 priv->thermal_init(tsc);
354                 rcar_gen3_thermal_calc_coefs(tsc, ptat, thcodes[i],
355                                              *rcar_gen3_ths_tj_1);
356
357                 zone = devm_thermal_zone_of_sensor_register(dev, i, tsc,
358                                                             &rcar_gen3_tz_of_ops);
359                 if (IS_ERR(zone)) {
360                         dev_err(dev, "Can't register thermal zone\n");
361                         ret = PTR_ERR(zone);
362                         goto error_unregister;
363                 }
364                 tsc->zone = zone;
365
366                 tsc->zone->tzp->no_hwmon = false;
367                 ret = thermal_add_hwmon_sysfs(tsc->zone);
368                 if (ret)
369                         goto error_unregister;
370
371                 ret = devm_add_action_or_reset(dev, rcar_gen3_hwmon_action, zone);
372                 if (ret)
373                         goto error_unregister;
374
375                 ret = of_thermal_get_ntrips(tsc->zone);
376                 if (ret < 0)
377                         goto error_unregister;
378
379                 dev_info(dev, "TSC%d: Loaded %d trip points\n", i, ret);
380         }
381
382         priv->num_tscs = i;
383
384         if (!priv->num_tscs) {
385                 ret = -ENODEV;
386                 goto error_unregister;
387         }
388
389         return 0;
390
391 error_unregister:
392         rcar_gen3_thermal_remove(pdev);
393
394         return ret;
395 }
396
397 static int __maybe_unused rcar_gen3_thermal_resume(struct device *dev)
398 {
399         struct rcar_gen3_thermal_priv *priv = dev_get_drvdata(dev);
400         unsigned int i;
401
402         for (i = 0; i < priv->num_tscs; i++) {
403                 struct rcar_gen3_thermal_tsc *tsc = priv->tscs[i];
404
405                 priv->thermal_init(tsc);
406         }
407
408         return 0;
409 }
410
411 static SIMPLE_DEV_PM_OPS(rcar_gen3_thermal_pm_ops, NULL,
412                          rcar_gen3_thermal_resume);
413
414 static struct platform_driver rcar_gen3_thermal_driver = {
415         .driver = {
416                 .name   = "rcar_gen3_thermal",
417                 .pm = &rcar_gen3_thermal_pm_ops,
418                 .of_match_table = rcar_gen3_thermal_dt_ids,
419         },
420         .probe          = rcar_gen3_thermal_probe,
421         .remove         = rcar_gen3_thermal_remove,
422 };
423 module_platform_driver(rcar_gen3_thermal_driver);
424
425 MODULE_LICENSE("GPL v2");
426 MODULE_DESCRIPTION("R-Car Gen3 THS thermal sensor driver");
427 MODULE_AUTHOR("Wolfram Sang <wsa+renesas@sang-engineering.com>");