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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> | |
73180f85 | 16 | #include <linux/mfd/dbx500-prcmu.h> |
1032fbfd BJ |
17 | #include <linux/regulator/driver.h> |
18 | #include <linux/regulator/machine.h> | |
19 | #include <linux/regulator/db8500-prcmu.h> | |
65602c32 | 20 | #include <linux/module.h> |
1032fbfd BJ |
21 | |
22 | /* | |
23 | * power state reference count | |
24 | */ | |
25 | static int power_state_active_cnt; /* will initialize to zero */ | |
26 | static DEFINE_SPINLOCK(power_state_active_lock); | |
27 | ||
28 | static void power_state_active_enable(void) | |
29 | { | |
30 | unsigned long flags; | |
31 | ||
32 | spin_lock_irqsave(&power_state_active_lock, flags); | |
33 | power_state_active_cnt++; | |
34 | spin_unlock_irqrestore(&power_state_active_lock, flags); | |
35 | } | |
36 | ||
37 | static int power_state_active_disable(void) | |
38 | { | |
39 | int ret = 0; | |
40 | unsigned long flags; | |
41 | ||
42 | spin_lock_irqsave(&power_state_active_lock, flags); | |
43 | if (power_state_active_cnt <= 0) { | |
44 | pr_err("power state: unbalanced enable/disable calls\n"); | |
45 | ret = -EINVAL; | |
46 | goto out; | |
47 | } | |
48 | ||
49 | power_state_active_cnt--; | |
50 | out: | |
51 | spin_unlock_irqrestore(&power_state_active_lock, flags); | |
52 | return ret; | |
53 | } | |
54 | ||
55 | /* | |
56 | * Exported interface for CPUIdle only. This function is called when interrupts | |
57 | * are turned off. Hence, no locking. | |
58 | */ | |
59 | int power_state_active_is_enabled(void) | |
60 | { | |
61 | return (power_state_active_cnt > 0); | |
62 | } | |
63 | ||
64 | /** | |
65 | * struct db8500_regulator_info - db8500 regulator information | |
66 | * @dev: device pointer | |
67 | * @desc: regulator description | |
68 | * @rdev: regulator device pointer | |
69 | * @is_enabled: status of the regulator | |
70 | * @epod_id: id for EPOD (power domain) | |
71 | * @is_ramret: RAM retention switch for EPOD (power domain) | |
72 | * @operating_point: operating point (only for vape, to be removed) | |
73 | * | |
74 | */ | |
75 | struct db8500_regulator_info { | |
76 | struct device *dev; | |
77 | struct regulator_desc desc; | |
78 | struct regulator_dev *rdev; | |
79 | bool is_enabled; | |
80 | u16 epod_id; | |
81 | bool is_ramret; | |
82 | bool exclude_from_power_state; | |
83 | unsigned int operating_point; | |
84 | }; | |
85 | ||
86 | static int db8500_regulator_enable(struct regulator_dev *rdev) | |
87 | { | |
88 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
89 | ||
90 | if (info == NULL) | |
91 | return -EINVAL; | |
92 | ||
93 | dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n", | |
94 | info->desc.name); | |
95 | ||
96 | info->is_enabled = true; | |
97 | if (!info->exclude_from_power_state) | |
98 | power_state_active_enable(); | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static int db8500_regulator_disable(struct regulator_dev *rdev) | |
104 | { | |
105 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
106 | int ret = 0; | |
107 | ||
108 | if (info == NULL) | |
109 | return -EINVAL; | |
110 | ||
111 | dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n", | |
112 | info->desc.name); | |
113 | ||
114 | info->is_enabled = false; | |
115 | if (!info->exclude_from_power_state) | |
116 | ret = power_state_active_disable(); | |
117 | ||
118 | return ret; | |
119 | } | |
120 | ||
121 | static int db8500_regulator_is_enabled(struct regulator_dev *rdev) | |
122 | { | |
123 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
124 | ||
125 | if (info == NULL) | |
126 | return -EINVAL; | |
127 | ||
128 | dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):" | |
129 | " %i\n", info->desc.name, info->is_enabled); | |
130 | ||
131 | return info->is_enabled; | |
132 | } | |
133 | ||
134 | /* db8500 regulator operations */ | |
135 | static struct regulator_ops db8500_regulator_ops = { | |
136 | .enable = db8500_regulator_enable, | |
137 | .disable = db8500_regulator_disable, | |
138 | .is_enabled = db8500_regulator_is_enabled, | |
139 | }; | |
140 | ||
141 | /* | |
142 | * EPOD control | |
143 | */ | |
144 | static bool epod_on[NUM_EPOD_ID]; | |
145 | static bool epod_ramret[NUM_EPOD_ID]; | |
146 | ||
147 | static int enable_epod(u16 epod_id, bool ramret) | |
148 | { | |
149 | int ret; | |
150 | ||
151 | if (ramret) { | |
152 | if (!epod_on[epod_id]) { | |
153 | ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET); | |
154 | if (ret < 0) | |
155 | return ret; | |
156 | } | |
157 | epod_ramret[epod_id] = true; | |
158 | } else { | |
159 | ret = prcmu_set_epod(epod_id, EPOD_STATE_ON); | |
160 | if (ret < 0) | |
161 | return ret; | |
162 | epod_on[epod_id] = true; | |
163 | } | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static int disable_epod(u16 epod_id, bool ramret) | |
169 | { | |
170 | int ret; | |
171 | ||
172 | if (ramret) { | |
173 | if (!epod_on[epod_id]) { | |
174 | ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF); | |
175 | if (ret < 0) | |
176 | return ret; | |
177 | } | |
178 | epod_ramret[epod_id] = false; | |
179 | } else { | |
180 | if (epod_ramret[epod_id]) { | |
181 | ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET); | |
182 | if (ret < 0) | |
183 | return ret; | |
184 | } else { | |
185 | ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF); | |
186 | if (ret < 0) | |
187 | return ret; | |
188 | } | |
189 | epod_on[epod_id] = false; | |
190 | } | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | /* | |
196 | * Regulator switch | |
197 | */ | |
198 | static int db8500_regulator_switch_enable(struct regulator_dev *rdev) | |
199 | { | |
200 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
201 | int ret; | |
202 | ||
203 | if (info == NULL) | |
204 | return -EINVAL; | |
205 | ||
206 | dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n", | |
207 | info->desc.name); | |
208 | ||
209 | ret = enable_epod(info->epod_id, info->is_ramret); | |
210 | if (ret < 0) { | |
211 | dev_err(rdev_get_dev(rdev), | |
212 | "regulator-switch-%s-enable: prcmu call failed\n", | |
213 | info->desc.name); | |
214 | goto out; | |
215 | } | |
216 | ||
217 | info->is_enabled = true; | |
218 | out: | |
219 | return ret; | |
220 | } | |
221 | ||
222 | static int db8500_regulator_switch_disable(struct regulator_dev *rdev) | |
223 | { | |
224 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
225 | int ret; | |
226 | ||
227 | if (info == NULL) | |
228 | return -EINVAL; | |
229 | ||
230 | dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n", | |
231 | info->desc.name); | |
232 | ||
233 | ret = disable_epod(info->epod_id, info->is_ramret); | |
234 | if (ret < 0) { | |
235 | dev_err(rdev_get_dev(rdev), | |
236 | "regulator_switch-%s-disable: prcmu call failed\n", | |
237 | info->desc.name); | |
238 | goto out; | |
239 | } | |
240 | ||
241 | info->is_enabled = 0; | |
242 | out: | |
243 | return ret; | |
244 | } | |
245 | ||
246 | static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev) | |
247 | { | |
248 | struct db8500_regulator_info *info = rdev_get_drvdata(rdev); | |
249 | ||
250 | if (info == NULL) | |
251 | return -EINVAL; | |
252 | ||
253 | dev_vdbg(rdev_get_dev(rdev), | |
254 | "regulator-switch-%s-is_enabled (is_enabled): %i\n", | |
255 | info->desc.name, info->is_enabled); | |
256 | ||
257 | return info->is_enabled; | |
258 | } | |
259 | ||
260 | static struct regulator_ops db8500_regulator_switch_ops = { | |
261 | .enable = db8500_regulator_switch_enable, | |
262 | .disable = db8500_regulator_switch_disable, | |
263 | .is_enabled = db8500_regulator_switch_is_enabled, | |
264 | }; | |
265 | ||
266 | /* | |
267 | * Regulator information | |
268 | */ | |
269 | static struct db8500_regulator_info | |
90609503 | 270 | db8500_regulator_info[DB8500_NUM_REGULATORS] = { |
1032fbfd BJ |
271 | [DB8500_REGULATOR_VAPE] = { |
272 | .desc = { | |
273 | .name = "db8500-vape", | |
274 | .id = DB8500_REGULATOR_VAPE, | |
275 | .ops = &db8500_regulator_ops, | |
276 | .type = REGULATOR_VOLTAGE, | |
277 | .owner = THIS_MODULE, | |
278 | }, | |
279 | }, | |
280 | [DB8500_REGULATOR_VARM] = { | |
281 | .desc = { | |
282 | .name = "db8500-varm", | |
283 | .id = DB8500_REGULATOR_VARM, | |
284 | .ops = &db8500_regulator_ops, | |
285 | .type = REGULATOR_VOLTAGE, | |
286 | .owner = THIS_MODULE, | |
287 | }, | |
288 | }, | |
289 | [DB8500_REGULATOR_VMODEM] = { | |
290 | .desc = { | |
291 | .name = "db8500-vmodem", | |
292 | .id = DB8500_REGULATOR_VMODEM, | |
293 | .ops = &db8500_regulator_ops, | |
294 | .type = REGULATOR_VOLTAGE, | |
295 | .owner = THIS_MODULE, | |
296 | }, | |
297 | }, | |
298 | [DB8500_REGULATOR_VPLL] = { | |
299 | .desc = { | |
300 | .name = "db8500-vpll", | |
301 | .id = DB8500_REGULATOR_VPLL, | |
302 | .ops = &db8500_regulator_ops, | |
303 | .type = REGULATOR_VOLTAGE, | |
304 | .owner = THIS_MODULE, | |
305 | }, | |
306 | }, | |
307 | [DB8500_REGULATOR_VSMPS1] = { | |
308 | .desc = { | |
309 | .name = "db8500-vsmps1", | |
310 | .id = DB8500_REGULATOR_VSMPS1, | |
311 | .ops = &db8500_regulator_ops, | |
312 | .type = REGULATOR_VOLTAGE, | |
313 | .owner = THIS_MODULE, | |
314 | }, | |
315 | }, | |
316 | [DB8500_REGULATOR_VSMPS2] = { | |
317 | .desc = { | |
318 | .name = "db8500-vsmps2", | |
319 | .id = DB8500_REGULATOR_VSMPS2, | |
320 | .ops = &db8500_regulator_ops, | |
321 | .type = REGULATOR_VOLTAGE, | |
322 | .owner = THIS_MODULE, | |
323 | }, | |
324 | .exclude_from_power_state = true, | |
325 | }, | |
326 | [DB8500_REGULATOR_VSMPS3] = { | |
327 | .desc = { | |
328 | .name = "db8500-vsmps3", | |
329 | .id = DB8500_REGULATOR_VSMPS3, | |
330 | .ops = &db8500_regulator_ops, | |
331 | .type = REGULATOR_VOLTAGE, | |
332 | .owner = THIS_MODULE, | |
333 | }, | |
334 | }, | |
335 | [DB8500_REGULATOR_VRF1] = { | |
336 | .desc = { | |
337 | .name = "db8500-vrf1", | |
338 | .id = DB8500_REGULATOR_VRF1, | |
339 | .ops = &db8500_regulator_ops, | |
340 | .type = REGULATOR_VOLTAGE, | |
341 | .owner = THIS_MODULE, | |
342 | }, | |
343 | }, | |
344 | [DB8500_REGULATOR_SWITCH_SVAMMDSP] = { | |
345 | .desc = { | |
346 | .name = "db8500-sva-mmdsp", | |
347 | .id = DB8500_REGULATOR_SWITCH_SVAMMDSP, | |
348 | .ops = &db8500_regulator_switch_ops, | |
349 | .type = REGULATOR_VOLTAGE, | |
350 | .owner = THIS_MODULE, | |
351 | }, | |
352 | .epod_id = EPOD_ID_SVAMMDSP, | |
353 | }, | |
354 | [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = { | |
355 | .desc = { | |
356 | .name = "db8500-sva-mmdsp-ret", | |
357 | .id = DB8500_REGULATOR_SWITCH_SVAMMDSPRET, | |
358 | .ops = &db8500_regulator_switch_ops, | |
359 | .type = REGULATOR_VOLTAGE, | |
360 | .owner = THIS_MODULE, | |
361 | }, | |
362 | .epod_id = EPOD_ID_SVAMMDSP, | |
363 | .is_ramret = true, | |
364 | }, | |
365 | [DB8500_REGULATOR_SWITCH_SVAPIPE] = { | |
366 | .desc = { | |
367 | .name = "db8500-sva-pipe", | |
368 | .id = DB8500_REGULATOR_SWITCH_SVAPIPE, | |
369 | .ops = &db8500_regulator_switch_ops, | |
370 | .type = REGULATOR_VOLTAGE, | |
371 | .owner = THIS_MODULE, | |
372 | }, | |
373 | .epod_id = EPOD_ID_SVAPIPE, | |
374 | }, | |
375 | [DB8500_REGULATOR_SWITCH_SIAMMDSP] = { | |
376 | .desc = { | |
377 | .name = "db8500-sia-mmdsp", | |
378 | .id = DB8500_REGULATOR_SWITCH_SIAMMDSP, | |
379 | .ops = &db8500_regulator_switch_ops, | |
380 | .type = REGULATOR_VOLTAGE, | |
381 | .owner = THIS_MODULE, | |
382 | }, | |
383 | .epod_id = EPOD_ID_SIAMMDSP, | |
384 | }, | |
385 | [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = { | |
386 | .desc = { | |
387 | .name = "db8500-sia-mmdsp-ret", | |
388 | .id = DB8500_REGULATOR_SWITCH_SIAMMDSPRET, | |
389 | .ops = &db8500_regulator_switch_ops, | |
390 | .type = REGULATOR_VOLTAGE, | |
391 | .owner = THIS_MODULE, | |
392 | }, | |
393 | .epod_id = EPOD_ID_SIAMMDSP, | |
394 | .is_ramret = true, | |
395 | }, | |
396 | [DB8500_REGULATOR_SWITCH_SIAPIPE] = { | |
397 | .desc = { | |
398 | .name = "db8500-sia-pipe", | |
399 | .id = DB8500_REGULATOR_SWITCH_SIAPIPE, | |
400 | .ops = &db8500_regulator_switch_ops, | |
401 | .type = REGULATOR_VOLTAGE, | |
402 | .owner = THIS_MODULE, | |
403 | }, | |
404 | .epod_id = EPOD_ID_SIAPIPE, | |
405 | }, | |
406 | [DB8500_REGULATOR_SWITCH_SGA] = { | |
407 | .desc = { | |
408 | .name = "db8500-sga", | |
409 | .id = DB8500_REGULATOR_SWITCH_SGA, | |
410 | .ops = &db8500_regulator_switch_ops, | |
411 | .type = REGULATOR_VOLTAGE, | |
412 | .owner = THIS_MODULE, | |
413 | }, | |
414 | .epod_id = EPOD_ID_SGA, | |
415 | }, | |
416 | [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = { | |
417 | .desc = { | |
418 | .name = "db8500-b2r2-mcde", | |
419 | .id = DB8500_REGULATOR_SWITCH_B2R2_MCDE, | |
420 | .ops = &db8500_regulator_switch_ops, | |
421 | .type = REGULATOR_VOLTAGE, | |
422 | .owner = THIS_MODULE, | |
423 | }, | |
424 | .epod_id = EPOD_ID_B2R2_MCDE, | |
425 | }, | |
426 | [DB8500_REGULATOR_SWITCH_ESRAM12] = { | |
427 | .desc = { | |
428 | .name = "db8500-esram12", | |
429 | .id = DB8500_REGULATOR_SWITCH_ESRAM12, | |
430 | .ops = &db8500_regulator_switch_ops, | |
431 | .type = REGULATOR_VOLTAGE, | |
432 | .owner = THIS_MODULE, | |
433 | }, | |
434 | .epod_id = EPOD_ID_ESRAM12, | |
435 | .is_enabled = true, | |
436 | }, | |
437 | [DB8500_REGULATOR_SWITCH_ESRAM12RET] = { | |
438 | .desc = { | |
439 | .name = "db8500-esram12-ret", | |
440 | .id = DB8500_REGULATOR_SWITCH_ESRAM12RET, | |
441 | .ops = &db8500_regulator_switch_ops, | |
442 | .type = REGULATOR_VOLTAGE, | |
443 | .owner = THIS_MODULE, | |
444 | }, | |
445 | .epod_id = EPOD_ID_ESRAM12, | |
446 | .is_ramret = true, | |
447 | }, | |
448 | [DB8500_REGULATOR_SWITCH_ESRAM34] = { | |
449 | .desc = { | |
450 | .name = "db8500-esram34", | |
451 | .id = DB8500_REGULATOR_SWITCH_ESRAM34, | |
452 | .ops = &db8500_regulator_switch_ops, | |
453 | .type = REGULATOR_VOLTAGE, | |
454 | .owner = THIS_MODULE, | |
455 | }, | |
456 | .epod_id = EPOD_ID_ESRAM34, | |
457 | .is_enabled = true, | |
458 | }, | |
459 | [DB8500_REGULATOR_SWITCH_ESRAM34RET] = { | |
460 | .desc = { | |
461 | .name = "db8500-esram34-ret", | |
462 | .id = DB8500_REGULATOR_SWITCH_ESRAM34RET, | |
463 | .ops = &db8500_regulator_switch_ops, | |
464 | .type = REGULATOR_VOLTAGE, | |
465 | .owner = THIS_MODULE, | |
466 | }, | |
467 | .epod_id = EPOD_ID_ESRAM34, | |
468 | .is_ramret = true, | |
469 | }, | |
470 | }; | |
471 | ||
472 | static int __devinit db8500_regulator_probe(struct platform_device *pdev) | |
473 | { | |
17cf8b42 SO |
474 | struct regulator_init_data *db8500_init_data = |
475 | dev_get_platdata(&pdev->dev); | |
1032fbfd BJ |
476 | int i, err; |
477 | ||
478 | /* register all regulators */ | |
479 | for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) { | |
480 | struct db8500_regulator_info *info; | |
481 | struct regulator_init_data *init_data = &db8500_init_data[i]; | |
482 | ||
483 | /* assign per-regulator data */ | |
484 | info = &db8500_regulator_info[i]; | |
485 | info->dev = &pdev->dev; | |
486 | ||
487 | /* register with the regulator framework */ | |
488 | info->rdev = regulator_register(&info->desc, &pdev->dev, | |
489 | init_data, info); | |
490 | if (IS_ERR(info->rdev)) { | |
491 | err = PTR_ERR(info->rdev); | |
492 | dev_err(&pdev->dev, "failed to register %s: err %i\n", | |
493 | info->desc.name, err); | |
494 | ||
495 | /* if failing, unregister all earlier regulators */ | |
90609503 | 496 | while (--i >= 0) { |
1032fbfd BJ |
497 | info = &db8500_regulator_info[i]; |
498 | regulator_unregister(info->rdev); | |
1032fbfd BJ |
499 | } |
500 | return err; | |
501 | } | |
502 | ||
503 | dev_dbg(rdev_get_dev(info->rdev), | |
504 | "regulator-%s-probed\n", info->desc.name); | |
505 | } | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | static int __exit db8500_regulator_remove(struct platform_device *pdev) | |
511 | { | |
512 | int i; | |
513 | ||
514 | for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) { | |
515 | struct db8500_regulator_info *info; | |
516 | info = &db8500_regulator_info[i]; | |
517 | ||
518 | dev_vdbg(rdev_get_dev(info->rdev), | |
519 | "regulator-%s-remove\n", info->desc.name); | |
520 | ||
521 | regulator_unregister(info->rdev); | |
522 | } | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | static struct platform_driver db8500_regulator_driver = { | |
528 | .driver = { | |
529 | .name = "db8500-prcmu-regulators", | |
530 | .owner = THIS_MODULE, | |
531 | }, | |
532 | .probe = db8500_regulator_probe, | |
533 | .remove = __exit_p(db8500_regulator_remove), | |
534 | }; | |
535 | ||
536 | static int __init db8500_regulator_init(void) | |
537 | { | |
90609503 | 538 | return platform_driver_register(&db8500_regulator_driver); |
1032fbfd BJ |
539 | } |
540 | ||
541 | static void __exit db8500_regulator_exit(void) | |
542 | { | |
543 | platform_driver_unregister(&db8500_regulator_driver); | |
544 | } | |
545 | ||
546 | arch_initcall(db8500_regulator_init); | |
547 | module_exit(db8500_regulator_exit); | |
548 | ||
549 | MODULE_AUTHOR("STMicroelectronics/ST-Ericsson"); | |
550 | MODULE_DESCRIPTION("DB8500 regulator driver"); | |
551 | MODULE_LICENSE("GPL v2"); |