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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> | |
22 | #include <linux/irq.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/reboot.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/thermal.h> | |
31 | ||
32 | #define IDLE_INTERVAL 5000 | |
33 | ||
34 | #define COMMON_STR 0x00 | |
35 | #define COMMON_ENR 0x04 | |
36 | #define COMMON_INTMSK 0x0c | |
37 | ||
38 | #define REG_POSNEG 0x20 | |
39 | #define REG_FILONOFF 0x28 | |
40 | #define REG_THSCR 0x2c | |
41 | #define REG_THSSR 0x30 | |
42 | #define REG_INTCTRL 0x34 | |
43 | ||
44 | /* THSCR */ | |
45 | #define CPCTL (1 << 12) | |
46 | ||
47 | /* THSSR */ | |
48 | #define CTEMP 0x3f | |
49 | ||
50 | struct rcar_thermal_common { | |
51 | void __iomem *base; | |
52 | struct device *dev; | |
53 | struct list_head head; | |
54 | spinlock_t lock; | |
55 | }; | |
56 | ||
57 | struct rcar_thermal_priv { | |
58 | void __iomem *base; | |
59 | struct rcar_thermal_common *common; | |
60 | struct thermal_zone_device *zone; | |
61 | struct delayed_work work; | |
62 | struct mutex lock; | |
63 | struct list_head list; | |
64 | int id; | |
65 | int ctemp; | |
66 | }; | |
67 | ||
68 | #define rcar_thermal_for_each_priv(pos, common) \ | |
69 | list_for_each_entry(pos, &common->head, list) | |
70 | ||
71 | #define MCELSIUS(temp) ((temp) * 1000) | |
72 | #define rcar_zone_to_priv(zone) ((zone)->devdata) | |
73 | #define rcar_priv_to_dev(priv) ((priv)->common->dev) | |
74 | #define rcar_has_irq_support(priv) ((priv)->common->base) | |
75 | #define rcar_id_to_shift(priv) ((priv)->id * 8) | |
76 | ||
77 | #ifdef DEBUG | |
78 | # define rcar_force_update_temp(priv) 1 | |
79 | #else | |
80 | # define rcar_force_update_temp(priv) 0 | |
81 | #endif | |
82 | ||
83 | /* | |
84 | * basic functions | |
85 | */ | |
86 | #define rcar_thermal_common_read(c, r) \ | |
87 | _rcar_thermal_common_read(c, COMMON_ ##r) | |
88 | static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common, | |
89 | u32 reg) | |
90 | { | |
91 | return ioread32(common->base + reg); | |
92 | } | |
93 | ||
94 | #define rcar_thermal_common_write(c, r, d) \ | |
95 | _rcar_thermal_common_write(c, COMMON_ ##r, d) | |
96 | static void _rcar_thermal_common_write(struct rcar_thermal_common *common, | |
97 | u32 reg, u32 data) | |
98 | { | |
99 | iowrite32(data, common->base + reg); | |
100 | } | |
101 | ||
102 | #define rcar_thermal_common_bset(c, r, m, d) \ | |
103 | _rcar_thermal_common_bset(c, COMMON_ ##r, m, d) | |
104 | static void _rcar_thermal_common_bset(struct rcar_thermal_common *common, | |
105 | u32 reg, u32 mask, u32 data) | |
106 | { | |
107 | u32 val; | |
108 | ||
109 | val = ioread32(common->base + reg); | |
110 | val &= ~mask; | |
111 | val |= (data & mask); | |
112 | iowrite32(val, common->base + reg); | |
113 | } | |
114 | ||
115 | #define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r) | |
116 | static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg) | |
117 | { | |
118 | return ioread32(priv->base + reg); | |
119 | } | |
120 | ||
121 | #define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d) | |
122 | static void _rcar_thermal_write(struct rcar_thermal_priv *priv, | |
123 | u32 reg, u32 data) | |
124 | { | |
125 | iowrite32(data, priv->base + reg); | |
126 | } | |
127 | ||
128 | #define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d) | |
129 | static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg, | |
130 | u32 mask, u32 data) | |
131 | { | |
132 | u32 val; | |
133 | ||
134 | val = ioread32(priv->base + reg); | |
135 | val &= ~mask; | |
136 | val |= (data & mask); | |
137 | iowrite32(val, priv->base + reg); | |
138 | } | |
139 | ||
140 | /* | |
141 | * zone device functions | |
142 | */ | |
143 | static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv) | |
144 | { | |
145 | struct device *dev = rcar_priv_to_dev(priv); | |
146 | int i; | |
147 | int ctemp, old, new; | |
148 | ||
149 | mutex_lock(&priv->lock); | |
150 | ||
151 | /* | |
152 | * TSC decides a value of CPTAP automatically, | |
153 | * and this is the conditions which validate interrupt. | |
154 | */ | |
155 | rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL); | |
156 | ||
157 | ctemp = 0; | |
158 | old = ~0; | |
159 | for (i = 0; i < 128; i++) { | |
160 | /* | |
161 | * we need to wait 300us after changing comparator offset | |
162 | * to get stable temperature. | |
163 | * see "Usage Notes" on datasheet | |
164 | */ | |
165 | udelay(300); | |
166 | ||
167 | new = rcar_thermal_read(priv, THSSR) & CTEMP; | |
168 | if (new == old) { | |
169 | ctemp = new; | |
170 | break; | |
171 | } | |
172 | old = new; | |
173 | } | |
174 | ||
175 | if (!ctemp) { | |
176 | dev_err(dev, "thermal sensor was broken\n"); | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | /* | |
181 | * enable IRQ | |
182 | */ | |
183 | if (rcar_has_irq_support(priv)) { | |
184 | rcar_thermal_write(priv, FILONOFF, 0); | |
185 | ||
186 | /* enable Rising/Falling edge interrupt */ | |
187 | rcar_thermal_write(priv, POSNEG, 0x1); | |
188 | rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) | | |
189 | ((ctemp - 1) << 0))); | |
190 | } | |
191 | ||
192 | dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp); | |
193 | ||
194 | priv->ctemp = ctemp; | |
195 | ||
196 | mutex_unlock(&priv->lock); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static int rcar_thermal_get_temp(struct thermal_zone_device *zone, | |
202 | unsigned long *temp) | |
203 | { | |
204 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
205 | ||
206 | if (!rcar_has_irq_support(priv) || rcar_force_update_temp(priv)) | |
207 | rcar_thermal_update_temp(priv); | |
208 | ||
209 | mutex_lock(&priv->lock); | |
210 | *temp = MCELSIUS((priv->ctemp * 5) - 65); | |
211 | mutex_unlock(&priv->lock); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone, | |
217 | int trip, enum thermal_trip_type *type) | |
218 | { | |
219 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
220 | struct device *dev = rcar_priv_to_dev(priv); | |
221 | ||
222 | /* see rcar_thermal_get_temp() */ | |
223 | switch (trip) { | |
224 | case 0: /* +90 <= temp */ | |
225 | *type = THERMAL_TRIP_CRITICAL; | |
226 | break; | |
227 | default: | |
228 | dev_err(dev, "rcar driver trip error\n"); | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone, | |
236 | int trip, unsigned long *temp) | |
237 | { | |
238 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
239 | struct device *dev = rcar_priv_to_dev(priv); | |
240 | ||
241 | /* see rcar_thermal_get_temp() */ | |
242 | switch (trip) { | |
243 | case 0: /* +90 <= temp */ | |
244 | *temp = MCELSIUS(90); | |
245 | break; | |
246 | default: | |
247 | dev_err(dev, "rcar driver trip error\n"); | |
248 | return -EINVAL; | |
249 | } | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static int rcar_thermal_notify(struct thermal_zone_device *zone, | |
255 | int trip, enum thermal_trip_type type) | |
256 | { | |
257 | struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone); | |
258 | struct device *dev = rcar_priv_to_dev(priv); | |
259 | ||
260 | switch (type) { | |
261 | case THERMAL_TRIP_CRITICAL: | |
262 | /* FIXME */ | |
263 | dev_warn(dev, "Thermal reached to critical temperature\n"); | |
264 | break; | |
265 | default: | |
266 | break; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static struct thermal_zone_device_ops rcar_thermal_zone_ops = { | |
273 | .get_temp = rcar_thermal_get_temp, | |
274 | .get_trip_type = rcar_thermal_get_trip_type, | |
275 | .get_trip_temp = rcar_thermal_get_trip_temp, | |
276 | .notify = rcar_thermal_notify, | |
277 | }; | |
278 | ||
279 | /* | |
280 | * interrupt | |
281 | */ | |
282 | #define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1) | |
283 | #define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0) | |
284 | static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable) | |
285 | { | |
286 | struct rcar_thermal_common *common = priv->common; | |
287 | unsigned long flags; | |
288 | u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */ | |
289 | ||
290 | spin_lock_irqsave(&common->lock, flags); | |
291 | ||
292 | rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask); | |
293 | ||
294 | spin_unlock_irqrestore(&common->lock, flags); | |
295 | } | |
296 | ||
297 | static void rcar_thermal_work(struct work_struct *work) | |
298 | { | |
299 | struct rcar_thermal_priv *priv; | |
300 | ||
301 | priv = container_of(work, struct rcar_thermal_priv, work.work); | |
302 | ||
303 | rcar_thermal_update_temp(priv); | |
304 | rcar_thermal_irq_enable(priv); | |
305 | thermal_zone_device_update(priv->zone); | |
306 | } | |
307 | ||
308 | static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status) | |
309 | { | |
310 | struct device *dev = rcar_priv_to_dev(priv); | |
311 | ||
312 | status = (status >> rcar_id_to_shift(priv)) & 0x3; | |
313 | ||
314 | if (status & 0x3) { | |
315 | dev_dbg(dev, "thermal%d %s%s\n", | |
316 | priv->id, | |
317 | (status & 0x2) ? "Rising " : "", | |
318 | (status & 0x1) ? "Falling" : ""); | |
319 | } | |
320 | ||
321 | return status; | |
322 | } | |
323 | ||
324 | static irqreturn_t rcar_thermal_irq(int irq, void *data) | |
325 | { | |
326 | struct rcar_thermal_common *common = data; | |
327 | struct rcar_thermal_priv *priv; | |
328 | unsigned long flags; | |
329 | u32 status, mask; | |
330 | ||
331 | spin_lock_irqsave(&common->lock, flags); | |
332 | ||
333 | mask = rcar_thermal_common_read(common, INTMSK); | |
334 | status = rcar_thermal_common_read(common, STR); | |
335 | rcar_thermal_common_write(common, STR, 0x000F0F0F & mask); | |
336 | ||
337 | spin_unlock_irqrestore(&common->lock, flags); | |
338 | ||
339 | status = status & ~mask; | |
340 | ||
341 | /* | |
342 | * check the status | |
343 | */ | |
344 | rcar_thermal_for_each_priv(priv, common) { | |
345 | if (rcar_thermal_had_changed(priv, status)) { | |
346 | rcar_thermal_irq_disable(priv); | |
347 | schedule_delayed_work(&priv->work, | |
348 | msecs_to_jiffies(300)); | |
349 | } | |
350 | } | |
351 | ||
352 | return IRQ_HANDLED; | |
353 | } | |
354 | ||
355 | /* | |
356 | * platform functions | |
357 | */ | |
358 | static int rcar_thermal_probe(struct platform_device *pdev) | |
359 | { | |
360 | struct rcar_thermal_common *common; | |
361 | struct rcar_thermal_priv *priv; | |
362 | struct device *dev = &pdev->dev; | |
363 | struct resource *res, *irq; | |
364 | int mres = 0; | |
365 | int i; | |
366 | int idle = IDLE_INTERVAL; | |
367 | ||
368 | common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL); | |
369 | if (!common) { | |
370 | dev_err(dev, "Could not allocate common\n"); | |
371 | return -ENOMEM; | |
372 | } | |
373 | ||
374 | INIT_LIST_HEAD(&common->head); | |
375 | spin_lock_init(&common->lock); | |
376 | common->dev = dev; | |
377 | ||
378 | irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); | |
379 | if (irq) { | |
380 | int ret; | |
381 | ||
382 | /* | |
383 | * platform has IRQ support. | |
384 | * Then, drier use common register | |
385 | */ | |
386 | res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); | |
387 | if (!res) { | |
388 | dev_err(dev, "Could not get platform resource\n"); | |
389 | return -ENODEV; | |
390 | } | |
391 | ||
392 | ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0, | |
393 | dev_name(dev), common); | |
394 | if (ret) { | |
395 | dev_err(dev, "irq request failed\n "); | |
396 | return ret; | |
397 | } | |
398 | ||
399 | /* | |
400 | * rcar_has_irq_support() will be enabled | |
401 | */ | |
402 | common->base = devm_request_and_ioremap(dev, res); | |
403 | if (!common->base) { | |
404 | dev_err(dev, "Unable to ioremap thermal register\n"); | |
405 | return -ENOMEM; | |
406 | } | |
407 | ||
408 | /* enable temperature comparation */ | |
409 | rcar_thermal_common_write(common, ENR, 0x00030303); | |
410 | ||
411 | idle = 0; /* polling delaye is not needed */ | |
412 | } | |
413 | ||
414 | for (i = 0;; i++) { | |
415 | res = platform_get_resource(pdev, IORESOURCE_MEM, mres++); | |
416 | if (!res) | |
417 | break; | |
418 | ||
419 | priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); | |
420 | if (!priv) { | |
421 | dev_err(dev, "Could not allocate priv\n"); | |
422 | return -ENOMEM; | |
423 | } | |
424 | ||
425 | priv->base = devm_request_and_ioremap(dev, res); | |
426 | if (!priv->base) { | |
427 | dev_err(dev, "Unable to ioremap priv register\n"); | |
428 | return -ENOMEM; | |
429 | } | |
430 | ||
431 | priv->common = common; | |
432 | priv->id = i; | |
433 | mutex_init(&priv->lock); | |
434 | INIT_LIST_HEAD(&priv->list); | |
435 | INIT_DELAYED_WORK(&priv->work, rcar_thermal_work); | |
436 | rcar_thermal_update_temp(priv); | |
437 | ||
438 | priv->zone = thermal_zone_device_register("rcar_thermal", | |
439 | 1, 0, priv, | |
440 | &rcar_thermal_zone_ops, NULL, 0, | |
441 | idle); | |
442 | if (IS_ERR(priv->zone)) { | |
443 | dev_err(dev, "can't register thermal zone\n"); | |
444 | goto error_unregister; | |
445 | } | |
446 | ||
447 | list_move_tail(&priv->list, &common->head); | |
448 | ||
449 | if (rcar_has_irq_support(priv)) | |
450 | rcar_thermal_irq_enable(priv); | |
451 | } | |
452 | ||
453 | platform_set_drvdata(pdev, common); | |
454 | ||
455 | dev_info(dev, "%d sensor proved\n", i); | |
456 | ||
457 | return 0; | |
458 | ||
459 | error_unregister: | |
460 | rcar_thermal_for_each_priv(priv, common) | |
461 | thermal_zone_device_unregister(priv->zone); | |
462 | ||
463 | return -ENODEV; | |
464 | } | |
465 | ||
466 | static int rcar_thermal_remove(struct platform_device *pdev) | |
467 | { | |
468 | struct rcar_thermal_common *common = platform_get_drvdata(pdev); | |
469 | struct rcar_thermal_priv *priv; | |
470 | ||
471 | rcar_thermal_for_each_priv(priv, common) | |
472 | thermal_zone_device_unregister(priv->zone); | |
473 | ||
474 | platform_set_drvdata(pdev, NULL); | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
479 | static const struct of_device_id rcar_thermal_dt_ids[] __devinitconst = { | |
480 | { .compatible = "renesas,rcar-thermal", }, | |
481 | {}, | |
482 | }; | |
483 | MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids); | |
484 | ||
485 | static struct platform_driver rcar_thermal_driver = { | |
486 | .driver = { | |
487 | .name = "rcar_thermal", | |
488 | .of_match_table = rcar_thermal_dt_ids, | |
489 | }, | |
490 | .probe = rcar_thermal_probe, | |
491 | .remove = rcar_thermal_remove, | |
492 | }; | |
493 | module_platform_driver(rcar_thermal_driver); | |
494 | ||
495 | MODULE_LICENSE("GPL"); | |
496 | MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver"); | |
497 | MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>"); |