Commit | Line | Data |
---|---|---|
1e426ffd KM |
1 | /* |
2 | * R-Car THS/TSC thermal sensor driver | |
3 | * | |
4 | * Copyright (C) 2012 Renesas Solutions Corp. | |
5 | * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
19 | */ | |
20 | #include <linux/delay.h> | |
21 | #include <linux/err.h> | |
e0a5172e KM |
22 | #include <linux/irq.h> |
23 | #include <linux/interrupt.h> | |
1e426ffd KM |
24 | #include <linux/io.h> |
25 | #include <linux/module.h> | |
26 | #include <linux/platform_device.h> | |
51d45d25 | 27 | #include <linux/pm_runtime.h> |
d2a73e22 | 28 | #include <linux/reboot.h> |
1e426ffd KM |
29 | #include <linux/slab.h> |
30 | #include <linux/spinlock.h> | |
31 | #include <linux/thermal.h> | |
32 | ||
d2a73e22 | 33 | #define IDLE_INTERVAL 5000 |
34 | ||
e0a5172e KM |
35 | #define COMMON_STR 0x00 |
36 | #define COMMON_ENR 0x04 | |
37 | #define COMMON_INTMSK 0x0c | |
38 | ||
39 | #define REG_POSNEG 0x20 | |
40 | #define REG_FILONOFF 0x28 | |
e9137a58 KM |
41 | #define REG_THSCR 0x2c |
42 | #define REG_THSSR 0x30 | |
e0a5172e | 43 | #define REG_INTCTRL 0x34 |
1e426ffd KM |
44 | |
45 | /* THSCR */ | |
f8f53e18 | 46 | #define CPCTL (1 << 12) |
1e426ffd KM |
47 | |
48 | /* THSSR */ | |
49 | #define CTEMP 0x3f | |
50 | ||
3676d1dd KM |
51 | struct rcar_thermal_common { |
52 | void __iomem *base; | |
53 | struct device *dev; | |
54 | struct list_head head; | |
e0a5172e | 55 | spinlock_t lock; |
3676d1dd | 56 | }; |
1e426ffd KM |
57 | |
58 | struct rcar_thermal_priv { | |
59 | void __iomem *base; | |
3676d1dd KM |
60 | struct rcar_thermal_common *common; |
61 | struct thermal_zone_device *zone; | |
e0a5172e | 62 | struct delayed_work work; |
b2bbc6a2 | 63 | struct mutex lock; |
3676d1dd | 64 | struct list_head list; |
e0a5172e | 65 | int id; |
913015c6 | 66 | u32 ctemp; |
1e426ffd KM |
67 | }; |
68 | ||
3676d1dd KM |
69 | #define rcar_thermal_for_each_priv(pos, common) \ |
70 | list_for_each_entry(pos, &common->head, list) | |
71 | ||
c499703e | 72 | #define MCELSIUS(temp) ((temp) * 1000) |
9dde8f86 | 73 | #define rcar_zone_to_priv(zone) ((zone)->devdata) |
3676d1dd KM |
74 | #define rcar_priv_to_dev(priv) ((priv)->common->dev) |
75 | #define rcar_has_irq_support(priv) ((priv)->common->base) | |
e0a5172e KM |
76 | #define rcar_id_to_shift(priv) ((priv)->id * 8) |
77 | ||
ca1e4558 KM |
78 | static const struct of_device_id rcar_thermal_dt_ids[] = { |
79 | { .compatible = "renesas,rcar-thermal", }, | |
80 | {}, | |
81 | }; | |
82 | MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids); | |
83 | ||
1e426ffd KM |
84 | /* |
85 | * basic functions | |
86 | */ | |
e9137a58 KM |
87 | #define rcar_thermal_common_read(c, r) \ |
88 | _rcar_thermal_common_read(c, COMMON_ ##r) | |
89 | static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common, | |
90 | u32 reg) | |
91 | { | |
92 | return ioread32(common->base + reg); | |
93 | } | |
94 | ||
95 | #define rcar_thermal_common_write(c, r, d) \ | |
96 | _rcar_thermal_common_write(c, COMMON_ ##r, d) | |
97 | static void _rcar_thermal_common_write(struct rcar_thermal_common *common, | |
98 | u32 reg, u32 data) | |
99 | { | |
100 | iowrite32(data, common->base + reg); | |
101 | } | |
102 | ||
103 | #define rcar_thermal_common_bset(c, r, m, d) \ | |
104 | _rcar_thermal_common_bset(c, COMMON_ ##r, m, d) | |
105 | static void _rcar_thermal_common_bset(struct rcar_thermal_common *common, | |
106 | u32 reg, u32 mask, u32 data) | |
107 | { | |
108 | u32 val; | |
109 | ||
110 | val = ioread32(common->base + reg); | |
111 | val &= ~mask; | |
112 | val |= (data & mask); | |
113 | iowrite32(val, common->base + reg); | |
114 | } | |
e9137a58 KM |
115 | |
116 | #define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r) | |
117 | static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg) | |
1e426ffd | 118 | { |
b2bbc6a2 | 119 | return ioread32(priv->base + reg); |
1e426ffd KM |
120 | } |
121 | ||
e9137a58 KM |
122 | #define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d) |
123 | static void _rcar_thermal_write(struct rcar_thermal_priv *priv, | |
124 | u32 reg, u32 data) | |
1e426ffd | 125 | { |
1e426ffd | 126 | iowrite32(data, priv->base + reg); |
1e426ffd | 127 | } |
1e426ffd | 128 | |
e9137a58 KM |
129 | #define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d) |
130 | static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg, | |
131 | u32 mask, u32 data) | |
1e426ffd | 132 | { |
1e426ffd KM |
133 | u32 val; |
134 | ||
1e426ffd KM |
135 | val = ioread32(priv->base + reg); |
136 | val &= ~mask; | |
137 | val |= (data & mask); | |
138 | iowrite32(val, priv->base + reg); | |
1e426ffd KM |
139 | } |
140 | ||
141 | /* | |
142 | * zone device functions | |
143 | */ | |
e0a5172e | 144 | static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv) |
1e426ffd | 145 | { |
f8f53e18 KM |
146 | struct device *dev = rcar_priv_to_dev(priv); |
147 | int i; | |
913015c6 | 148 | u32 ctemp, old, new; |
f0e68fc3 | 149 | int ret = -EINVAL; |
f8f53e18 | 150 | |
b2bbc6a2 KM |
151 | mutex_lock(&priv->lock); |
152 | ||
f8f53e18 KM |
153 | /* |
154 | * TSC decides a value of CPTAP automatically, | |
155 | * and this is the conditions which validate interrupt. | |
156 | */ | |
157 | rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL); | |
158 | ||
159 | ctemp = 0; | |
160 | old = ~0; | |
161 | for (i = 0; i < 128; i++) { | |
1e426ffd KM |
162 | /* |
163 | * we need to wait 300us after changing comparator offset | |
164 | * to get stable temperature. | |
165 | * see "Usage Notes" on datasheet | |
166 | */ | |
1e426ffd KM |
167 | udelay(300); |
168 | ||
f8f53e18 KM |
169 | new = rcar_thermal_read(priv, THSSR) & CTEMP; |
170 | if (new == old) { | |
171 | ctemp = new; | |
1e426ffd KM |
172 | break; |
173 | } | |
f8f53e18 | 174 | old = new; |
1e426ffd KM |
175 | } |
176 | ||
f8f53e18 KM |
177 | if (!ctemp) { |
178 | dev_err(dev, "thermal sensor was broken\n"); | |
f0e68fc3 | 179 | goto err_out_unlock; |
f8f53e18 KM |
180 | } |
181 | ||
e0a5172e KM |
182 | /* |
183 | * enable IRQ | |
184 | */ | |
185 | if (rcar_has_irq_support(priv)) { | |
186 | rcar_thermal_write(priv, FILONOFF, 0); | |
187 | ||
188 | /* enable Rising/Falling edge interrupt */ | |
189 | rcar_thermal_write(priv, POSNEG, 0x1); | |
190 | rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) | | |
191 | ((ctemp - 1) << 0))); | |
192 | } | |
193 | ||
194 | dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp); | |
195 | ||
196 | priv->ctemp = ctemp; | |
f0e68fc3 WY |
197 | ret = 0; |
198 | err_out_unlock: | |
b2bbc6a2 | 199 | mutex_unlock(&priv->lock); |
f0e68fc3 | 200 | return ret; |
1e426ffd KM |
201 | } |
202 | ||
17e8351a | 203 | static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp) |
e0a5172e KM |
204 | { |
205 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
5440c40b | 206 | int tmp; |
a1ade565 | 207 | int ret; |
e0a5172e | 208 | |
a1ade565 KM |
209 | ret = rcar_thermal_update_temp(priv); |
210 | if (ret < 0) | |
211 | return ret; | |
e0a5172e KM |
212 | |
213 | mutex_lock(&priv->lock); | |
5440c40b | 214 | tmp = MCELSIUS((priv->ctemp * 5) - 65); |
e0a5172e KM |
215 | mutex_unlock(&priv->lock); |
216 | ||
5440c40b KM |
217 | if ((tmp < MCELSIUS(-45)) || (tmp > MCELSIUS(125))) { |
218 | struct device *dev = rcar_priv_to_dev(priv); | |
219 | ||
220 | dev_err(dev, "it couldn't measure temperature correctly\n"); | |
221 | return -EIO; | |
222 | } | |
223 | ||
224 | *temp = tmp; | |
225 | ||
e0a5172e KM |
226 | return 0; |
227 | } | |
228 | ||
d2a73e22 | 229 | static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone, |
230 | int trip, enum thermal_trip_type *type) | |
231 | { | |
232 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
3676d1dd | 233 | struct device *dev = rcar_priv_to_dev(priv); |
d2a73e22 | 234 | |
235 | /* see rcar_thermal_get_temp() */ | |
236 | switch (trip) { | |
237 | case 0: /* +90 <= temp */ | |
238 | *type = THERMAL_TRIP_CRITICAL; | |
239 | break; | |
240 | default: | |
3676d1dd | 241 | dev_err(dev, "rcar driver trip error\n"); |
d2a73e22 | 242 | return -EINVAL; |
243 | } | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone, | |
17e8351a | 249 | int trip, int *temp) |
d2a73e22 | 250 | { |
251 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
3676d1dd | 252 | struct device *dev = rcar_priv_to_dev(priv); |
d2a73e22 | 253 | |
254 | /* see rcar_thermal_get_temp() */ | |
255 | switch (trip) { | |
256 | case 0: /* +90 <= temp */ | |
257 | *temp = MCELSIUS(90); | |
258 | break; | |
259 | default: | |
3676d1dd | 260 | dev_err(dev, "rcar driver trip error\n"); |
d2a73e22 | 261 | return -EINVAL; |
262 | } | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | static int rcar_thermal_notify(struct thermal_zone_device *zone, | |
268 | int trip, enum thermal_trip_type type) | |
269 | { | |
270 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
3676d1dd | 271 | struct device *dev = rcar_priv_to_dev(priv); |
d2a73e22 | 272 | |
273 | switch (type) { | |
274 | case THERMAL_TRIP_CRITICAL: | |
275 | /* FIXME */ | |
3676d1dd | 276 | dev_warn(dev, "Thermal reached to critical temperature\n"); |
d2a73e22 | 277 | break; |
278 | default: | |
279 | break; | |
280 | } | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
1e426ffd | 285 | static struct thermal_zone_device_ops rcar_thermal_zone_ops = { |
d2a73e22 | 286 | .get_temp = rcar_thermal_get_temp, |
287 | .get_trip_type = rcar_thermal_get_trip_type, | |
288 | .get_trip_temp = rcar_thermal_get_trip_temp, | |
289 | .notify = rcar_thermal_notify, | |
1e426ffd KM |
290 | }; |
291 | ||
e0a5172e KM |
292 | /* |
293 | * interrupt | |
294 | */ | |
295 | #define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1) | |
296 | #define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0) | |
297 | static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable) | |
298 | { | |
299 | struct rcar_thermal_common *common = priv->common; | |
300 | unsigned long flags; | |
301 | u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */ | |
302 | ||
ffbcdf8a KM |
303 | if (!rcar_has_irq_support(priv)) |
304 | return; | |
305 | ||
e0a5172e KM |
306 | spin_lock_irqsave(&common->lock, flags); |
307 | ||
308 | rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask); | |
309 | ||
310 | spin_unlock_irqrestore(&common->lock, flags); | |
311 | } | |
312 | ||
313 | static void rcar_thermal_work(struct work_struct *work) | |
314 | { | |
315 | struct rcar_thermal_priv *priv; | |
17e8351a | 316 | int cctemp, nctemp; |
a1ade565 | 317 | int ret; |
e0a5172e KM |
318 | |
319 | priv = container_of(work, struct rcar_thermal_priv, work.work); | |
320 | ||
9477165e | 321 | rcar_thermal_get_temp(priv->zone, &cctemp); |
a1ade565 KM |
322 | ret = rcar_thermal_update_temp(priv); |
323 | if (ret < 0) | |
324 | return; | |
325 | ||
e0a5172e | 326 | rcar_thermal_irq_enable(priv); |
9477165e PT |
327 | |
328 | rcar_thermal_get_temp(priv->zone, &nctemp); | |
329 | if (nctemp != cctemp) | |
330 | thermal_zone_device_update(priv->zone); | |
e0a5172e KM |
331 | } |
332 | ||
333 | static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status) | |
334 | { | |
335 | struct device *dev = rcar_priv_to_dev(priv); | |
336 | ||
337 | status = (status >> rcar_id_to_shift(priv)) & 0x3; | |
338 | ||
206c0cba | 339 | if (status) { |
e0a5172e KM |
340 | dev_dbg(dev, "thermal%d %s%s\n", |
341 | priv->id, | |
342 | (status & 0x2) ? "Rising " : "", | |
343 | (status & 0x1) ? "Falling" : ""); | |
344 | } | |
345 | ||
346 | return status; | |
347 | } | |
348 | ||
349 | static irqreturn_t rcar_thermal_irq(int irq, void *data) | |
350 | { | |
351 | struct rcar_thermal_common *common = data; | |
352 | struct rcar_thermal_priv *priv; | |
353 | unsigned long flags; | |
354 | u32 status, mask; | |
355 | ||
356 | spin_lock_irqsave(&common->lock, flags); | |
357 | ||
358 | mask = rcar_thermal_common_read(common, INTMSK); | |
359 | status = rcar_thermal_common_read(common, STR); | |
360 | rcar_thermal_common_write(common, STR, 0x000F0F0F & mask); | |
361 | ||
362 | spin_unlock_irqrestore(&common->lock, flags); | |
363 | ||
364 | status = status & ~mask; | |
365 | ||
366 | /* | |
367 | * check the status | |
368 | */ | |
369 | rcar_thermal_for_each_priv(priv, common) { | |
370 | if (rcar_thermal_had_changed(priv, status)) { | |
371 | rcar_thermal_irq_disable(priv); | |
372 | schedule_delayed_work(&priv->work, | |
373 | msecs_to_jiffies(300)); | |
374 | } | |
375 | } | |
376 | ||
377 | return IRQ_HANDLED; | |
378 | } | |
379 | ||
1e426ffd KM |
380 | /* |
381 | * platform functions | |
382 | */ | |
84f0e490 KM |
383 | static int rcar_thermal_remove(struct platform_device *pdev) |
384 | { | |
385 | struct rcar_thermal_common *common = platform_get_drvdata(pdev); | |
386 | struct device *dev = &pdev->dev; | |
387 | struct rcar_thermal_priv *priv; | |
388 | ||
389 | rcar_thermal_for_each_priv(priv, common) { | |
ffbcdf8a | 390 | rcar_thermal_irq_disable(priv); |
84f0e490 KM |
391 | thermal_zone_device_unregister(priv->zone); |
392 | } | |
393 | ||
394 | pm_runtime_put(dev); | |
395 | pm_runtime_disable(dev); | |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
1e426ffd KM |
400 | static int rcar_thermal_probe(struct platform_device *pdev) |
401 | { | |
3676d1dd | 402 | struct rcar_thermal_common *common; |
1e426ffd | 403 | struct rcar_thermal_priv *priv; |
3676d1dd KM |
404 | struct device *dev = &pdev->dev; |
405 | struct resource *res, *irq; | |
406 | int mres = 0; | |
407 | int i; | |
fb84d990 | 408 | int ret = -ENODEV; |
e0a5172e | 409 | int idle = IDLE_INTERVAL; |
11313746 | 410 | u32 enr_bits = 0; |
1e426ffd | 411 | |
3676d1dd | 412 | common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL); |
b0a60d88 | 413 | if (!common) |
1e426ffd | 414 | return -ENOMEM; |
1e426ffd | 415 | |
84f0e490 KM |
416 | platform_set_drvdata(pdev, common); |
417 | ||
3676d1dd | 418 | INIT_LIST_HEAD(&common->head); |
e0a5172e | 419 | spin_lock_init(&common->lock); |
3676d1dd KM |
420 | common->dev = dev; |
421 | ||
51d45d25 KM |
422 | pm_runtime_enable(dev); |
423 | pm_runtime_get_sync(dev); | |
424 | ||
3676d1dd KM |
425 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
426 | if (irq) { | |
427 | /* | |
428 | * platform has IRQ support. | |
ee853add | 429 | * Then, driver uses common registers |
3676d1dd KM |
430 | * rcar_has_irq_support() will be enabled |
431 | */ | |
c28f692c | 432 | res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); |
5095526f SK |
433 | common->base = devm_ioremap_resource(dev, res); |
434 | if (IS_ERR(common->base)) | |
435 | return PTR_ERR(common->base); | |
e0a5172e | 436 | |
6fe495e0 | 437 | idle = 0; /* polling delay is not needed */ |
1e426ffd KM |
438 | } |
439 | ||
3676d1dd KM |
440 | for (i = 0;; i++) { |
441 | res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); | |
442 | if (!res) | |
443 | break; | |
444 | ||
445 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
446 | if (!priv) { | |
1dc20828 KM |
447 | ret = -ENOMEM; |
448 | goto error_unregister; | |
3676d1dd KM |
449 | } |
450 | ||
5095526f | 451 | priv->base = devm_ioremap_resource(dev, res); |
1dc20828 KM |
452 | if (IS_ERR(priv->base)) { |
453 | ret = PTR_ERR(priv->base); | |
454 | goto error_unregister; | |
455 | } | |
3676d1dd KM |
456 | |
457 | priv->common = common; | |
e0a5172e | 458 | priv->id = i; |
3676d1dd KM |
459 | mutex_init(&priv->lock); |
460 | INIT_LIST_HEAD(&priv->list); | |
e0a5172e | 461 | INIT_DELAYED_WORK(&priv->work, rcar_thermal_work); |
a1ade565 KM |
462 | ret = rcar_thermal_update_temp(priv); |
463 | if (ret < 0) | |
464 | goto error_unregister; | |
3676d1dd KM |
465 | |
466 | priv->zone = thermal_zone_device_register("rcar_thermal", | |
467 | 1, 0, priv, | |
468 | &rcar_thermal_zone_ops, NULL, 0, | |
e0a5172e | 469 | idle); |
3676d1dd KM |
470 | if (IS_ERR(priv->zone)) { |
471 | dev_err(dev, "can't register thermal zone\n"); | |
fb84d990 | 472 | ret = PTR_ERR(priv->zone); |
3676d1dd KM |
473 | goto error_unregister; |
474 | } | |
475 | ||
ffbcdf8a | 476 | rcar_thermal_irq_enable(priv); |
1dc20828 KM |
477 | |
478 | list_move_tail(&priv->list, &common->head); | |
11313746 YS |
479 | |
480 | /* update ENR bits */ | |
481 | enr_bits |= 3 << (i * 8); | |
1e426ffd KM |
482 | } |
483 | ||
11313746 | 484 | /* enable temperature comparation */ |
0b37a83a GU |
485 | if (irq) { |
486 | ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0, | |
487 | dev_name(dev), common); | |
488 | if (ret) { | |
489 | dev_err(dev, "irq request failed\n "); | |
490 | goto error_unregister; | |
491 | } | |
492 | ||
11313746 | 493 | rcar_thermal_common_write(common, ENR, enr_bits); |
0b37a83a | 494 | } |
11313746 | 495 | |
3db46c93 | 496 | dev_info(dev, "%d sensor probed\n", i); |
1e426ffd KM |
497 | |
498 | return 0; | |
3676d1dd KM |
499 | |
500 | error_unregister: | |
84f0e490 | 501 | rcar_thermal_remove(pdev); |
51d45d25 | 502 | |
fb84d990 | 503 | return ret; |
1e426ffd KM |
504 | } |
505 | ||
1e426ffd KM |
506 | static struct platform_driver rcar_thermal_driver = { |
507 | .driver = { | |
508 | .name = "rcar_thermal", | |
76cc1887 | 509 | .of_match_table = rcar_thermal_dt_ids, |
1e426ffd KM |
510 | }, |
511 | .probe = rcar_thermal_probe, | |
512 | .remove = rcar_thermal_remove, | |
513 | }; | |
514 | module_platform_driver(rcar_thermal_driver); | |
515 | ||
516 | MODULE_LICENSE("GPL"); | |
517 | MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver"); | |
518 | MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); |