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1032fbfd BJ |
1 | /* |
2 | * Copyright (C) ST-Ericsson SA 2010 | |
3 | * | |
4 | * License Terms: GNU General Public License v2 | |
5 | * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson | |
6 | * Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson | |
7 | * | |
8 | * Power domain regulators on DB8500 | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/platform_device.h> | |
1032fbfd BJ |
16 | #include <linux/mfd/db8500-prcmu.h> |
17 | #include <linux/regulator/driver.h> | |
18 | #include <linux/regulator/machine.h> | |
19 | #include <linux/regulator/db8500-prcmu.h> | |
20 | ||
21 | /* | |
22 | * power state reference count | |
23 | */ | |
24 | static int power_state_active_cnt; /* will initialize to zero */ | |
25 | static DEFINE_SPINLOCK(power_state_active_lock); | |
26 | ||
27 | static void power_state_active_enable(void) | |
28 | { | |
29 | unsigned long flags; | |
30 | ||
31 | spin_lock_irqsave(&power_state_active_lock, flags); | |
32 | power_state_active_cnt++; | |
33 | spin_unlock_irqrestore(&power_state_active_lock, flags); | |
34 | } | |
35 | ||
36 | static int power_state_active_disable(void) | |
37 | { | |
38 | int ret = 0; | |
39 | unsigned long flags; | |
40 | ||
41 | spin_lock_irqsave(&power_state_active_lock, flags); | |
42 | if (power_state_active_cnt <= 0) { | |
43 | pr_err("power state: unbalanced enable/disable calls\n"); | |
44 | ret = -EINVAL; | |
45 | goto out; | |
46 | } | |
47 | ||
48 | power_state_active_cnt--; | |
49 | out: | |
50 | spin_unlock_irqrestore(&power_state_active_lock, flags); | |
51 | return ret; | |
52 | } | |
53 | ||
54 | /* | |
55 | * Exported interface for CPUIdle only. This function is called when interrupts | |
56 | * are turned off. Hence, no locking. | |
57 | */ | |
58 | int power_state_active_is_enabled(void) | |
59 | { | |
60 | return (power_state_active_cnt > 0); | |
61 | } | |
62 | ||
63 | /** | |
64 | * struct db8500_regulator_info - db8500 regulator information | |
65 | * @dev: device pointer | |
66 | * @desc: regulator description | |
67 | * @rdev: regulator device pointer | |
68 | * @is_enabled: status of the regulator | |
69 | * @epod_id: id for EPOD (power domain) | |
70 | * @is_ramret: RAM retention switch for EPOD (power domain) | |
71 | * @operating_point: operating point (only for vape, to be removed) | |
72 | * | |
73 | */ | |
74 | struct db8500_regulator_info { | |
75 | struct device *dev; | |
76 | struct regulator_desc desc; | |
77 | struct regulator_dev *rdev; | |
78 | bool is_enabled; | |
79 | u16 epod_id; | |
80 | bool is_ramret; | |
81 | bool exclude_from_power_state; | |
82 | unsigned int operating_point; | |
83 | }; | |
84 | ||
85 | static int db8500_regulator_enable(struct regulator_dev *rdev) | |
86 | { | |
87 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
88 | ||
89 | if (info == NULL) | |
90 | return -EINVAL; | |
91 | ||
92 | dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n", | |
93 | info->desc.name); | |
94 | ||
95 | info->is_enabled = true; | |
96 | if (!info->exclude_from_power_state) | |
97 | power_state_active_enable(); | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static int db8500_regulator_disable(struct regulator_dev *rdev) | |
103 | { | |
104 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
105 | int ret = 0; | |
106 | ||
107 | if (info == NULL) | |
108 | return -EINVAL; | |
109 | ||
110 | dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n", | |
111 | info->desc.name); | |
112 | ||
113 | info->is_enabled = false; | |
114 | if (!info->exclude_from_power_state) | |
115 | ret = power_state_active_disable(); | |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
120 | static int db8500_regulator_is_enabled(struct regulator_dev *rdev) | |
121 | { | |
122 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
123 | ||
124 | if (info == NULL) | |
125 | return -EINVAL; | |
126 | ||
127 | dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):" | |
128 | " %i\n", info->desc.name, info->is_enabled); | |
129 | ||
130 | return info->is_enabled; | |
131 | } | |
132 | ||
133 | /* db8500 regulator operations */ | |
134 | static struct regulator_ops db8500_regulator_ops = { | |
135 | .enable = db8500_regulator_enable, | |
136 | .disable = db8500_regulator_disable, | |
137 | .is_enabled = db8500_regulator_is_enabled, | |
138 | }; | |
139 | ||
140 | /* | |
141 | * EPOD control | |
142 | */ | |
143 | static bool epod_on[NUM_EPOD_ID]; | |
144 | static bool epod_ramret[NUM_EPOD_ID]; | |
145 | ||
146 | static int enable_epod(u16 epod_id, bool ramret) | |
147 | { | |
148 | int ret; | |
149 | ||
150 | if (ramret) { | |
151 | if (!epod_on[epod_id]) { | |
152 | ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET); | |
153 | if (ret < 0) | |
154 | return ret; | |
155 | } | |
156 | epod_ramret[epod_id] = true; | |
157 | } else { | |
158 | ret = prcmu_set_epod(epod_id, EPOD_STATE_ON); | |
159 | if (ret < 0) | |
160 | return ret; | |
161 | epod_on[epod_id] = true; | |
162 | } | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static int disable_epod(u16 epod_id, bool ramret) | |
168 | { | |
169 | int ret; | |
170 | ||
171 | if (ramret) { | |
172 | if (!epod_on[epod_id]) { | |
173 | ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF); | |
174 | if (ret < 0) | |
175 | return ret; | |
176 | } | |
177 | epod_ramret[epod_id] = false; | |
178 | } else { | |
179 | if (epod_ramret[epod_id]) { | |
180 | ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET); | |
181 | if (ret < 0) | |
182 | return ret; | |
183 | } else { | |
184 | ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF); | |
185 | if (ret < 0) | |
186 | return ret; | |
187 | } | |
188 | epod_on[epod_id] = false; | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | /* | |
195 | * Regulator switch | |
196 | */ | |
197 | static int db8500_regulator_switch_enable(struct regulator_dev *rdev) | |
198 | { | |
199 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
200 | int ret; | |
201 | ||
202 | if (info == NULL) | |
203 | return -EINVAL; | |
204 | ||
205 | dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n", | |
206 | info->desc.name); | |
207 | ||
208 | ret = enable_epod(info->epod_id, info->is_ramret); | |
209 | if (ret < 0) { | |
210 | dev_err(rdev_get_dev(rdev), | |
211 | "regulator-switch-%s-enable: prcmu call failed\n", | |
212 | info->desc.name); | |
213 | goto out; | |
214 | } | |
215 | ||
216 | info->is_enabled = true; | |
217 | out: | |
218 | return ret; | |
219 | } | |
220 | ||
221 | static int db8500_regulator_switch_disable(struct regulator_dev *rdev) | |
222 | { | |
223 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
224 | int ret; | |
225 | ||
226 | if (info == NULL) | |
227 | return -EINVAL; | |
228 | ||
229 | dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n", | |
230 | info->desc.name); | |
231 | ||
232 | ret = disable_epod(info->epod_id, info->is_ramret); | |
233 | if (ret < 0) { | |
234 | dev_err(rdev_get_dev(rdev), | |
235 | "regulator_switch-%s-disable: prcmu call failed\n", | |
236 | info->desc.name); | |
237 | goto out; | |
238 | } | |
239 | ||
240 | info->is_enabled = 0; | |
241 | out: | |
242 | return ret; | |
243 | } | |
244 | ||
245 | static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev) | |
246 | { | |
247 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
248 | ||
249 | if (info == NULL) | |
250 | return -EINVAL; | |
251 | ||
252 | dev_vdbg(rdev_get_dev(rdev), | |
253 | "regulator-switch-%s-is_enabled (is_enabled): %i\n", | |
254 | info->desc.name, info->is_enabled); | |
255 | ||
256 | return info->is_enabled; | |
257 | } | |
258 | ||
259 | static struct regulator_ops db8500_regulator_switch_ops = { | |
260 | .enable = db8500_regulator_switch_enable, | |
261 | .disable = db8500_regulator_switch_disable, | |
262 | .is_enabled = db8500_regulator_switch_is_enabled, | |
263 | }; | |
264 | ||
265 | /* | |
266 | * Regulator information | |
267 | */ | |
268 | static struct db8500_regulator_info | |
269 | db8500_regulator_info[DB8500_NUM_REGULATORS] = { | |
270 | [DB8500_REGULATOR_VAPE] = { | |
271 | .desc = { | |
272 | .name = "db8500-vape", | |
273 | .id = DB8500_REGULATOR_VAPE, | |
274 | .ops = &db8500_regulator_ops, | |
275 | .type = REGULATOR_VOLTAGE, | |
276 | .owner = THIS_MODULE, | |
277 | }, | |
278 | }, | |
279 | [DB8500_REGULATOR_VARM] = { | |
280 | .desc = { | |
281 | .name = "db8500-varm", | |
282 | .id = DB8500_REGULATOR_VARM, | |
283 | .ops = &db8500_regulator_ops, | |
284 | .type = REGULATOR_VOLTAGE, | |
285 | .owner = THIS_MODULE, | |
286 | }, | |
287 | }, | |
288 | [DB8500_REGULATOR_VMODEM] = { | |
289 | .desc = { | |
290 | .name = "db8500-vmodem", | |
291 | .id = DB8500_REGULATOR_VMODEM, | |
292 | .ops = &db8500_regulator_ops, | |
293 | .type = REGULATOR_VOLTAGE, | |
294 | .owner = THIS_MODULE, | |
295 | }, | |
296 | }, | |
297 | [DB8500_REGULATOR_VPLL] = { | |
298 | .desc = { | |
299 | .name = "db8500-vpll", | |
300 | .id = DB8500_REGULATOR_VPLL, | |
301 | .ops = &db8500_regulator_ops, | |
302 | .type = REGULATOR_VOLTAGE, | |
303 | .owner = THIS_MODULE, | |
304 | }, | |
305 | }, | |
306 | [DB8500_REGULATOR_VSMPS1] = { | |
307 | .desc = { | |
308 | .name = "db8500-vsmps1", | |
309 | .id = DB8500_REGULATOR_VSMPS1, | |
310 | .ops = &db8500_regulator_ops, | |
311 | .type = REGULATOR_VOLTAGE, | |
312 | .owner = THIS_MODULE, | |
313 | }, | |
314 | }, | |
315 | [DB8500_REGULATOR_VSMPS2] = { | |
316 | .desc = { | |
317 | .name = "db8500-vsmps2", | |
318 | .id = DB8500_REGULATOR_VSMPS2, | |
319 | .ops = &db8500_regulator_ops, | |
320 | .type = REGULATOR_VOLTAGE, | |
321 | .owner = THIS_MODULE, | |
322 | }, | |
323 | .exclude_from_power_state = true, | |
324 | }, | |
325 | [DB8500_REGULATOR_VSMPS3] = { | |
326 | .desc = { | |
327 | .name = "db8500-vsmps3", | |
328 | .id = DB8500_REGULATOR_VSMPS3, | |
329 | .ops = &db8500_regulator_ops, | |
330 | .type = REGULATOR_VOLTAGE, | |
331 | .owner = THIS_MODULE, | |
332 | }, | |
333 | }, | |
334 | [DB8500_REGULATOR_VRF1] = { | |
335 | .desc = { | |
336 | .name = "db8500-vrf1", | |
337 | .id = DB8500_REGULATOR_VRF1, | |
338 | .ops = &db8500_regulator_ops, | |
339 | .type = REGULATOR_VOLTAGE, | |
340 | .owner = THIS_MODULE, | |
341 | }, | |
342 | }, | |
343 | [DB8500_REGULATOR_SWITCH_SVAMMDSP] = { | |
344 | .desc = { | |
345 | .name = "db8500-sva-mmdsp", | |
346 | .id = DB8500_REGULATOR_SWITCH_SVAMMDSP, | |
347 | .ops = &db8500_regulator_switch_ops, | |
348 | .type = REGULATOR_VOLTAGE, | |
349 | .owner = THIS_MODULE, | |
350 | }, | |
351 | .epod_id = EPOD_ID_SVAMMDSP, | |
352 | }, | |
353 | [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = { | |
354 | .desc = { | |
355 | .name = "db8500-sva-mmdsp-ret", | |
356 | .id = DB8500_REGULATOR_SWITCH_SVAMMDSPRET, | |
357 | .ops = &db8500_regulator_switch_ops, | |
358 | .type = REGULATOR_VOLTAGE, | |
359 | .owner = THIS_MODULE, | |
360 | }, | |
361 | .epod_id = EPOD_ID_SVAMMDSP, | |
362 | .is_ramret = true, | |
363 | }, | |
364 | [DB8500_REGULATOR_SWITCH_SVAPIPE] = { | |
365 | .desc = { | |
366 | .name = "db8500-sva-pipe", | |
367 | .id = DB8500_REGULATOR_SWITCH_SVAPIPE, | |
368 | .ops = &db8500_regulator_switch_ops, | |
369 | .type = REGULATOR_VOLTAGE, | |
370 | .owner = THIS_MODULE, | |
371 | }, | |
372 | .epod_id = EPOD_ID_SVAPIPE, | |
373 | }, | |
374 | [DB8500_REGULATOR_SWITCH_SIAMMDSP] = { | |
375 | .desc = { | |
376 | .name = "db8500-sia-mmdsp", | |
377 | .id = DB8500_REGULATOR_SWITCH_SIAMMDSP, | |
378 | .ops = &db8500_regulator_switch_ops, | |
379 | .type = REGULATOR_VOLTAGE, | |
380 | .owner = THIS_MODULE, | |
381 | }, | |
382 | .epod_id = EPOD_ID_SIAMMDSP, | |
383 | }, | |
384 | [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = { | |
385 | .desc = { | |
386 | .name = "db8500-sia-mmdsp-ret", | |
387 | .id = DB8500_REGULATOR_SWITCH_SIAMMDSPRET, | |
388 | .ops = &db8500_regulator_switch_ops, | |
389 | .type = REGULATOR_VOLTAGE, | |
390 | .owner = THIS_MODULE, | |
391 | }, | |
392 | .epod_id = EPOD_ID_SIAMMDSP, | |
393 | .is_ramret = true, | |
394 | }, | |
395 | [DB8500_REGULATOR_SWITCH_SIAPIPE] = { | |
396 | .desc = { | |
397 | .name = "db8500-sia-pipe", | |
398 | .id = DB8500_REGULATOR_SWITCH_SIAPIPE, | |
399 | .ops = &db8500_regulator_switch_ops, | |
400 | .type = REGULATOR_VOLTAGE, | |
401 | .owner = THIS_MODULE, | |
402 | }, | |
403 | .epod_id = EPOD_ID_SIAPIPE, | |
404 | }, | |
405 | [DB8500_REGULATOR_SWITCH_SGA] = { | |
406 | .desc = { | |
407 | .name = "db8500-sga", | |
408 | .id = DB8500_REGULATOR_SWITCH_SGA, | |
409 | .ops = &db8500_regulator_switch_ops, | |
410 | .type = REGULATOR_VOLTAGE, | |
411 | .owner = THIS_MODULE, | |
412 | }, | |
413 | .epod_id = EPOD_ID_SGA, | |
414 | }, | |
415 | [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = { | |
416 | .desc = { | |
417 | .name = "db8500-b2r2-mcde", | |
418 | .id = DB8500_REGULATOR_SWITCH_B2R2_MCDE, | |
419 | .ops = &db8500_regulator_switch_ops, | |
420 | .type = REGULATOR_VOLTAGE, | |
421 | .owner = THIS_MODULE, | |
422 | }, | |
423 | .epod_id = EPOD_ID_B2R2_MCDE, | |
424 | }, | |
425 | [DB8500_REGULATOR_SWITCH_ESRAM12] = { | |
426 | .desc = { | |
427 | .name = "db8500-esram12", | |
428 | .id = DB8500_REGULATOR_SWITCH_ESRAM12, | |
429 | .ops = &db8500_regulator_switch_ops, | |
430 | .type = REGULATOR_VOLTAGE, | |
431 | .owner = THIS_MODULE, | |
432 | }, | |
433 | .epod_id = EPOD_ID_ESRAM12, | |
434 | .is_enabled = true, | |
435 | }, | |
436 | [DB8500_REGULATOR_SWITCH_ESRAM12RET] = { | |
437 | .desc = { | |
438 | .name = "db8500-esram12-ret", | |
439 | .id = DB8500_REGULATOR_SWITCH_ESRAM12RET, | |
440 | .ops = &db8500_regulator_switch_ops, | |
441 | .type = REGULATOR_VOLTAGE, | |
442 | .owner = THIS_MODULE, | |
443 | }, | |
444 | .epod_id = EPOD_ID_ESRAM12, | |
445 | .is_ramret = true, | |
446 | }, | |
447 | [DB8500_REGULATOR_SWITCH_ESRAM34] = { | |
448 | .desc = { | |
449 | .name = "db8500-esram34", | |
450 | .id = DB8500_REGULATOR_SWITCH_ESRAM34, | |
451 | .ops = &db8500_regulator_switch_ops, | |
452 | .type = REGULATOR_VOLTAGE, | |
453 | .owner = THIS_MODULE, | |
454 | }, | |
455 | .epod_id = EPOD_ID_ESRAM34, | |
456 | .is_enabled = true, | |
457 | }, | |
458 | [DB8500_REGULATOR_SWITCH_ESRAM34RET] = { | |
459 | .desc = { | |
460 | .name = "db8500-esram34-ret", | |
461 | .id = DB8500_REGULATOR_SWITCH_ESRAM34RET, | |
462 | .ops = &db8500_regulator_switch_ops, | |
463 | .type = REGULATOR_VOLTAGE, | |
464 | .owner = THIS_MODULE, | |
465 | }, | |
466 | .epod_id = EPOD_ID_ESRAM34, | |
467 | .is_ramret = true, | |
468 | }, | |
469 | }; | |
470 | ||
471 | static int __devinit db8500_regulator_probe(struct platform_device *pdev) | |
472 | { | |
17cf8b42 SO |
473 | struct regulator_init_data *db8500_init_data = |
474 | dev_get_platdata(&pdev->dev); | |
1032fbfd BJ |
475 | int i, err; |
476 | ||
477 | /* register all regulators */ | |
478 | for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) { | |
479 | struct db8500_regulator_info *info; | |
480 | struct regulator_init_data *init_data = &db8500_init_data[i]; | |
481 | ||
482 | /* assign per-regulator data */ | |
483 | info = &db8500_regulator_info[i]; | |
484 | info->dev = &pdev->dev; | |
485 | ||
486 | /* register with the regulator framework */ | |
487 | info->rdev = regulator_register(&info->desc, &pdev->dev, | |
488 | init_data, info); | |
489 | if (IS_ERR(info->rdev)) { | |
490 | err = PTR_ERR(info->rdev); | |
491 | dev_err(&pdev->dev, "failed to register %s: err %i\n", | |
492 | info->desc.name, err); | |
493 | ||
494 | /* if failing, unregister all earlier regulators */ | |
495 | i--; | |
496 | while (i >= 0) { | |
497 | info = &db8500_regulator_info[i]; | |
498 | regulator_unregister(info->rdev); | |
499 | i--; | |
500 | } | |
501 | return err; | |
502 | } | |
503 | ||
504 | dev_dbg(rdev_get_dev(info->rdev), | |
505 | "regulator-%s-probed\n", info->desc.name); | |
506 | } | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | static int __exit db8500_regulator_remove(struct platform_device *pdev) | |
512 | { | |
513 | int i; | |
514 | ||
515 | for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) { | |
516 | struct db8500_regulator_info *info; | |
517 | info = &db8500_regulator_info[i]; | |
518 | ||
519 | dev_vdbg(rdev_get_dev(info->rdev), | |
520 | "regulator-%s-remove\n", info->desc.name); | |
521 | ||
522 | regulator_unregister(info->rdev); | |
523 | } | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | static struct platform_driver db8500_regulator_driver = { | |
529 | .driver = { | |
530 | .name = "db8500-prcmu-regulators", | |
531 | .owner = THIS_MODULE, | |
532 | }, | |
533 | .probe = db8500_regulator_probe, | |
534 | .remove = __exit_p(db8500_regulator_remove), | |
535 | }; | |
536 | ||
537 | static int __init db8500_regulator_init(void) | |
538 | { | |
539 | int ret; | |
540 | ||
541 | ret = platform_driver_register(&db8500_regulator_driver); | |
542 | if (ret < 0) | |
543 | return -ENODEV; | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | static void __exit db8500_regulator_exit(void) | |
549 | { | |
550 | platform_driver_unregister(&db8500_regulator_driver); | |
551 | } | |
552 | ||
553 | arch_initcall(db8500_regulator_init); | |
554 | module_exit(db8500_regulator_exit); | |
555 | ||
556 | MODULE_AUTHOR("STMicroelectronics/ST-Ericsson"); | |
557 | MODULE_DESCRIPTION("DB8500 regulator driver"); | |
558 | MODULE_LICENSE("GPL v2"); |