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path: root/drivers/regulator/db8500-prcmu.c
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Diffstat (limited to 'drivers/regulator/db8500-prcmu.c')
-rw-r--r--drivers/regulator/db8500-prcmu.c558
1 files changed, 558 insertions, 0 deletions
diff --git a/drivers/regulator/db8500-prcmu.c b/drivers/regulator/db8500-prcmu.c
new file mode 100644
index 000000000000..e5f7b8fe51f4
--- /dev/null
+++ b/drivers/regulator/db8500-prcmu.c
@@ -0,0 +1,558 @@
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>
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 */
24static int power_state_active_cnt; /* will initialize to zero */
25static DEFINE_SPINLOCK(power_state_active_lock);
26
27static 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
36static 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--;
49out:
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 */
58int 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 */
74struct 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
85static 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
102static 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
120static 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 */
134static 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 */
143static bool epod_on[NUM_EPOD_ID];
144static bool epod_ramret[NUM_EPOD_ID];
145
146static 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
167static 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 */
197static 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;
217out:
218 return ret;
219}
220
221static 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;
241out:
242 return ret;
243}
244
245static 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
259static 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 */
268static 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
471static int __devinit db8500_regulator_probe(struct platform_device *pdev)
472{
473 struct regulator_init_data *db8500_init_data =
474 dev_get_platdata(&pdev->dev);
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
511static 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
528static 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
537static 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
548static void __exit db8500_regulator_exit(void)
549{
550 platform_driver_unregister(&db8500_regulator_driver);
551}
552
553arch_initcall(db8500_regulator_init);
554module_exit(db8500_regulator_exit);
555
556MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
557MODULE_DESCRIPTION("DB8500 regulator driver");
558MODULE_LICENSE("GPL v2");
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