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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 | ||
78 | #ifdef DEBUG | |
79 | # define rcar_force_update_temp(priv) 1 | |
80 | #else | |
81 | # define rcar_force_update_temp(priv) 0 | |
82 | #endif | |
c499703e | 83 | |
ca1e4558 KM |
84 | static const struct of_device_id rcar_thermal_dt_ids[] = { |
85 | { .compatible = "renesas,rcar-thermal", }, | |
86 | {}, | |
87 | }; | |
88 | MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids); | |
89 | ||
1e426ffd KM |
90 | /* |
91 | * basic functions | |
92 | */ | |
e9137a58 KM |
93 | #define rcar_thermal_common_read(c, r) \ |
94 | _rcar_thermal_common_read(c, COMMON_ ##r) | |
95 | static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common, | |
96 | u32 reg) | |
97 | { | |
98 | return ioread32(common->base + reg); | |
99 | } | |
100 | ||
101 | #define rcar_thermal_common_write(c, r, d) \ | |
102 | _rcar_thermal_common_write(c, COMMON_ ##r, d) | |
103 | static void _rcar_thermal_common_write(struct rcar_thermal_common *common, | |
104 | u32 reg, u32 data) | |
105 | { | |
106 | iowrite32(data, common->base + reg); | |
107 | } | |
108 | ||
109 | #define rcar_thermal_common_bset(c, r, m, d) \ | |
110 | _rcar_thermal_common_bset(c, COMMON_ ##r, m, d) | |
111 | static void _rcar_thermal_common_bset(struct rcar_thermal_common *common, | |
112 | u32 reg, u32 mask, u32 data) | |
113 | { | |
114 | u32 val; | |
115 | ||
116 | val = ioread32(common->base + reg); | |
117 | val &= ~mask; | |
118 | val |= (data & mask); | |
119 | iowrite32(val, common->base + reg); | |
120 | } | |
e9137a58 KM |
121 | |
122 | #define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r) | |
123 | static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg) | |
1e426ffd | 124 | { |
b2bbc6a2 | 125 | return ioread32(priv->base + reg); |
1e426ffd KM |
126 | } |
127 | ||
e9137a58 KM |
128 | #define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d) |
129 | static void _rcar_thermal_write(struct rcar_thermal_priv *priv, | |
130 | u32 reg, u32 data) | |
1e426ffd | 131 | { |
1e426ffd | 132 | iowrite32(data, priv->base + reg); |
1e426ffd | 133 | } |
1e426ffd | 134 | |
e9137a58 KM |
135 | #define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d) |
136 | static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg, | |
137 | u32 mask, u32 data) | |
1e426ffd | 138 | { |
1e426ffd KM |
139 | u32 val; |
140 | ||
1e426ffd KM |
141 | val = ioread32(priv->base + reg); |
142 | val &= ~mask; | |
143 | val |= (data & mask); | |
144 | iowrite32(val, priv->base + reg); | |
1e426ffd KM |
145 | } |
146 | ||
147 | /* | |
148 | * zone device functions | |
149 | */ | |
e0a5172e | 150 | static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv) |
1e426ffd | 151 | { |
f8f53e18 KM |
152 | struct device *dev = rcar_priv_to_dev(priv); |
153 | int i; | |
913015c6 | 154 | u32 ctemp, old, new; |
f0e68fc3 | 155 | int ret = -EINVAL; |
f8f53e18 | 156 | |
b2bbc6a2 KM |
157 | mutex_lock(&priv->lock); |
158 | ||
f8f53e18 KM |
159 | /* |
160 | * TSC decides a value of CPTAP automatically, | |
161 | * and this is the conditions which validate interrupt. | |
162 | */ | |
163 | rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL); | |
164 | ||
165 | ctemp = 0; | |
166 | old = ~0; | |
167 | for (i = 0; i < 128; i++) { | |
1e426ffd KM |
168 | /* |
169 | * we need to wait 300us after changing comparator offset | |
170 | * to get stable temperature. | |
171 | * see "Usage Notes" on datasheet | |
172 | */ | |
1e426ffd KM |
173 | udelay(300); |
174 | ||
f8f53e18 KM |
175 | new = rcar_thermal_read(priv, THSSR) & CTEMP; |
176 | if (new == old) { | |
177 | ctemp = new; | |
1e426ffd KM |
178 | break; |
179 | } | |
f8f53e18 | 180 | old = new; |
1e426ffd KM |
181 | } |
182 | ||
f8f53e18 KM |
183 | if (!ctemp) { |
184 | dev_err(dev, "thermal sensor was broken\n"); | |
f0e68fc3 | 185 | goto err_out_unlock; |
f8f53e18 KM |
186 | } |
187 | ||
e0a5172e KM |
188 | /* |
189 | * enable IRQ | |
190 | */ | |
191 | if (rcar_has_irq_support(priv)) { | |
192 | rcar_thermal_write(priv, FILONOFF, 0); | |
193 | ||
194 | /* enable Rising/Falling edge interrupt */ | |
195 | rcar_thermal_write(priv, POSNEG, 0x1); | |
196 | rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) | | |
197 | ((ctemp - 1) << 0))); | |
198 | } | |
199 | ||
200 | dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp); | |
201 | ||
202 | priv->ctemp = ctemp; | |
f0e68fc3 WY |
203 | ret = 0; |
204 | err_out_unlock: | |
b2bbc6a2 | 205 | mutex_unlock(&priv->lock); |
f0e68fc3 | 206 | return ret; |
1e426ffd KM |
207 | } |
208 | ||
17e8351a | 209 | static int rcar_thermal_get_temp(struct thermal_zone_device *zone, int *temp) |
e0a5172e KM |
210 | { |
211 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
212 | ||
213 | if (!rcar_has_irq_support(priv) || rcar_force_update_temp(priv)) | |
214 | rcar_thermal_update_temp(priv); | |
215 | ||
216 | mutex_lock(&priv->lock); | |
217 | *temp = MCELSIUS((priv->ctemp * 5) - 65); | |
218 | mutex_unlock(&priv->lock); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
d2a73e22 | 223 | static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone, |
224 | int trip, enum thermal_trip_type *type) | |
225 | { | |
226 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
3676d1dd | 227 | struct device *dev = rcar_priv_to_dev(priv); |
d2a73e22 | 228 | |
229 | /* see rcar_thermal_get_temp() */ | |
230 | switch (trip) { | |
231 | case 0: /* +90 <= temp */ | |
232 | *type = THERMAL_TRIP_CRITICAL; | |
233 | break; | |
234 | default: | |
3676d1dd | 235 | dev_err(dev, "rcar driver trip error\n"); |
d2a73e22 | 236 | return -EINVAL; |
237 | } | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone, | |
17e8351a | 243 | int trip, int *temp) |
d2a73e22 | 244 | { |
245 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
3676d1dd | 246 | struct device *dev = rcar_priv_to_dev(priv); |
d2a73e22 | 247 | |
248 | /* see rcar_thermal_get_temp() */ | |
249 | switch (trip) { | |
250 | case 0: /* +90 <= temp */ | |
251 | *temp = MCELSIUS(90); | |
252 | break; | |
253 | default: | |
3676d1dd | 254 | dev_err(dev, "rcar driver trip error\n"); |
d2a73e22 | 255 | return -EINVAL; |
256 | } | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static int rcar_thermal_notify(struct thermal_zone_device *zone, | |
262 | int trip, enum thermal_trip_type type) | |
263 | { | |
264 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
3676d1dd | 265 | struct device *dev = rcar_priv_to_dev(priv); |
d2a73e22 | 266 | |
267 | switch (type) { | |
268 | case THERMAL_TRIP_CRITICAL: | |
269 | /* FIXME */ | |
3676d1dd | 270 | dev_warn(dev, "Thermal reached to critical temperature\n"); |
d2a73e22 | 271 | break; |
272 | default: | |
273 | break; | |
274 | } | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
1e426ffd | 279 | static struct thermal_zone_device_ops rcar_thermal_zone_ops = { |
d2a73e22 | 280 | .get_temp = rcar_thermal_get_temp, |
281 | .get_trip_type = rcar_thermal_get_trip_type, | |
282 | .get_trip_temp = rcar_thermal_get_trip_temp, | |
283 | .notify = rcar_thermal_notify, | |
1e426ffd KM |
284 | }; |
285 | ||
e0a5172e KM |
286 | /* |
287 | * interrupt | |
288 | */ | |
289 | #define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1) | |
290 | #define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0) | |
291 | static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable) | |
292 | { | |
293 | struct rcar_thermal_common *common = priv->common; | |
294 | unsigned long flags; | |
295 | u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */ | |
296 | ||
297 | spin_lock_irqsave(&common->lock, flags); | |
298 | ||
299 | rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask); | |
300 | ||
301 | spin_unlock_irqrestore(&common->lock, flags); | |
302 | } | |
303 | ||
304 | static void rcar_thermal_work(struct work_struct *work) | |
305 | { | |
306 | struct rcar_thermal_priv *priv; | |
17e8351a | 307 | int cctemp, nctemp; |
e0a5172e KM |
308 | |
309 | priv = container_of(work, struct rcar_thermal_priv, work.work); | |
310 | ||
9477165e | 311 | rcar_thermal_get_temp(priv->zone, &cctemp); |
e0a5172e KM |
312 | rcar_thermal_update_temp(priv); |
313 | rcar_thermal_irq_enable(priv); | |
9477165e PT |
314 | |
315 | rcar_thermal_get_temp(priv->zone, &nctemp); | |
316 | if (nctemp != cctemp) | |
317 | thermal_zone_device_update(priv->zone); | |
e0a5172e KM |
318 | } |
319 | ||
320 | static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status) | |
321 | { | |
322 | struct device *dev = rcar_priv_to_dev(priv); | |
323 | ||
324 | status = (status >> rcar_id_to_shift(priv)) & 0x3; | |
325 | ||
206c0cba | 326 | if (status) { |
e0a5172e KM |
327 | dev_dbg(dev, "thermal%d %s%s\n", |
328 | priv->id, | |
329 | (status & 0x2) ? "Rising " : "", | |
330 | (status & 0x1) ? "Falling" : ""); | |
331 | } | |
332 | ||
333 | return status; | |
334 | } | |
335 | ||
336 | static irqreturn_t rcar_thermal_irq(int irq, void *data) | |
337 | { | |
338 | struct rcar_thermal_common *common = data; | |
339 | struct rcar_thermal_priv *priv; | |
340 | unsigned long flags; | |
341 | u32 status, mask; | |
342 | ||
343 | spin_lock_irqsave(&common->lock, flags); | |
344 | ||
345 | mask = rcar_thermal_common_read(common, INTMSK); | |
346 | status = rcar_thermal_common_read(common, STR); | |
347 | rcar_thermal_common_write(common, STR, 0x000F0F0F & mask); | |
348 | ||
349 | spin_unlock_irqrestore(&common->lock, flags); | |
350 | ||
351 | status = status & ~mask; | |
352 | ||
353 | /* | |
354 | * check the status | |
355 | */ | |
356 | rcar_thermal_for_each_priv(priv, common) { | |
357 | if (rcar_thermal_had_changed(priv, status)) { | |
358 | rcar_thermal_irq_disable(priv); | |
359 | schedule_delayed_work(&priv->work, | |
360 | msecs_to_jiffies(300)); | |
361 | } | |
362 | } | |
363 | ||
364 | return IRQ_HANDLED; | |
365 | } | |
366 | ||
1e426ffd KM |
367 | /* |
368 | * platform functions | |
369 | */ | |
84f0e490 KM |
370 | static int rcar_thermal_remove(struct platform_device *pdev) |
371 | { | |
372 | struct rcar_thermal_common *common = platform_get_drvdata(pdev); | |
373 | struct device *dev = &pdev->dev; | |
374 | struct rcar_thermal_priv *priv; | |
375 | ||
376 | rcar_thermal_for_each_priv(priv, common) { | |
377 | if (rcar_has_irq_support(priv)) | |
378 | rcar_thermal_irq_disable(priv); | |
379 | thermal_zone_device_unregister(priv->zone); | |
380 | } | |
381 | ||
382 | pm_runtime_put(dev); | |
383 | pm_runtime_disable(dev); | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
1e426ffd KM |
388 | static int rcar_thermal_probe(struct platform_device *pdev) |
389 | { | |
3676d1dd | 390 | struct rcar_thermal_common *common; |
1e426ffd | 391 | struct rcar_thermal_priv *priv; |
3676d1dd KM |
392 | struct device *dev = &pdev->dev; |
393 | struct resource *res, *irq; | |
394 | int mres = 0; | |
395 | int i; | |
fb84d990 | 396 | int ret = -ENODEV; |
e0a5172e | 397 | int idle = IDLE_INTERVAL; |
11313746 | 398 | u32 enr_bits = 0; |
1e426ffd | 399 | |
3676d1dd | 400 | common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL); |
b0a60d88 | 401 | if (!common) |
1e426ffd | 402 | return -ENOMEM; |
1e426ffd | 403 | |
84f0e490 KM |
404 | platform_set_drvdata(pdev, common); |
405 | ||
3676d1dd | 406 | INIT_LIST_HEAD(&common->head); |
e0a5172e | 407 | spin_lock_init(&common->lock); |
3676d1dd KM |
408 | common->dev = dev; |
409 | ||
51d45d25 KM |
410 | pm_runtime_enable(dev); |
411 | pm_runtime_get_sync(dev); | |
412 | ||
3676d1dd KM |
413 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
414 | if (irq) { | |
415 | /* | |
416 | * platform has IRQ support. | |
ee853add | 417 | * Then, driver uses common registers |
3676d1dd KM |
418 | * rcar_has_irq_support() will be enabled |
419 | */ | |
c28f692c | 420 | res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); |
5095526f SK |
421 | common->base = devm_ioremap_resource(dev, res); |
422 | if (IS_ERR(common->base)) | |
423 | return PTR_ERR(common->base); | |
e0a5172e | 424 | |
6fe495e0 | 425 | idle = 0; /* polling delay is not needed */ |
1e426ffd KM |
426 | } |
427 | ||
3676d1dd KM |
428 | for (i = 0;; i++) { |
429 | res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); | |
430 | if (!res) | |
431 | break; | |
432 | ||
433 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
434 | if (!priv) { | |
1dc20828 KM |
435 | ret = -ENOMEM; |
436 | goto error_unregister; | |
3676d1dd KM |
437 | } |
438 | ||
5095526f | 439 | priv->base = devm_ioremap_resource(dev, res); |
1dc20828 KM |
440 | if (IS_ERR(priv->base)) { |
441 | ret = PTR_ERR(priv->base); | |
442 | goto error_unregister; | |
443 | } | |
3676d1dd KM |
444 | |
445 | priv->common = common; | |
e0a5172e | 446 | priv->id = i; |
3676d1dd KM |
447 | mutex_init(&priv->lock); |
448 | INIT_LIST_HEAD(&priv->list); | |
e0a5172e KM |
449 | INIT_DELAYED_WORK(&priv->work, rcar_thermal_work); |
450 | rcar_thermal_update_temp(priv); | |
3676d1dd KM |
451 | |
452 | priv->zone = thermal_zone_device_register("rcar_thermal", | |
453 | 1, 0, priv, | |
454 | &rcar_thermal_zone_ops, NULL, 0, | |
e0a5172e | 455 | idle); |
3676d1dd KM |
456 | if (IS_ERR(priv->zone)) { |
457 | dev_err(dev, "can't register thermal zone\n"); | |
fb84d990 | 458 | ret = PTR_ERR(priv->zone); |
3676d1dd KM |
459 | goto error_unregister; |
460 | } | |
461 | ||
e0a5172e KM |
462 | if (rcar_has_irq_support(priv)) |
463 | rcar_thermal_irq_enable(priv); | |
1dc20828 KM |
464 | |
465 | list_move_tail(&priv->list, &common->head); | |
11313746 YS |
466 | |
467 | /* update ENR bits */ | |
468 | enr_bits |= 3 << (i * 8); | |
1e426ffd KM |
469 | } |
470 | ||
11313746 | 471 | /* enable temperature comparation */ |
0b37a83a GU |
472 | if (irq) { |
473 | ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0, | |
474 | dev_name(dev), common); | |
475 | if (ret) { | |
476 | dev_err(dev, "irq request failed\n "); | |
477 | goto error_unregister; | |
478 | } | |
479 | ||
11313746 | 480 | rcar_thermal_common_write(common, ENR, enr_bits); |
0b37a83a | 481 | } |
11313746 | 482 | |
3db46c93 | 483 | dev_info(dev, "%d sensor probed\n", i); |
1e426ffd KM |
484 | |
485 | return 0; | |
3676d1dd KM |
486 | |
487 | error_unregister: | |
84f0e490 | 488 | rcar_thermal_remove(pdev); |
51d45d25 | 489 | |
fb84d990 | 490 | return ret; |
1e426ffd KM |
491 | } |
492 | ||
1e426ffd KM |
493 | static struct platform_driver rcar_thermal_driver = { |
494 | .driver = { | |
495 | .name = "rcar_thermal", | |
76cc1887 | 496 | .of_match_table = rcar_thermal_dt_ids, |
1e426ffd KM |
497 | }, |
498 | .probe = rcar_thermal_probe, | |
499 | .remove = rcar_thermal_remove, | |
500 | }; | |
501 | module_platform_driver(rcar_thermal_driver); | |
502 | ||
503 | MODULE_LICENSE("GPL"); | |
504 | MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver"); | |
505 | MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); |