Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

Linux/drivers/regulator/db8500-prcmu.c

  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/dbx500-prcmu.h>
 17 #include <linux/regulator/driver.h>
 18 #include <linux/regulator/machine.h>
 19 #include <linux/regulator/db8500-prcmu.h>
 20 #include <linux/regulator/of_regulator.h>
 21 #include <linux/of.h>
 22 #include <linux/module.h>
 23 #include "dbx500-prcmu.h"
 24 
 25 static int db8500_regulator_enable(struct regulator_dev *rdev)
 26 {
 27         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
 28 
 29         if (info == NULL)
 30                 return -EINVAL;
 31 
 32         dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n",
 33                 info->desc.name);
 34 
 35         if (!info->is_enabled) {
 36                 info->is_enabled = true;
 37                 if (!info->exclude_from_power_state)
 38                         power_state_active_enable();
 39         }
 40 
 41         return 0;
 42 }
 43 
 44 static int db8500_regulator_disable(struct regulator_dev *rdev)
 45 {
 46         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
 47         int ret = 0;
 48 
 49         if (info == NULL)
 50                 return -EINVAL;
 51 
 52         dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n",
 53                 info->desc.name);
 54 
 55         if (info->is_enabled) {
 56                 info->is_enabled = false;
 57                 if (!info->exclude_from_power_state)
 58                         ret = power_state_active_disable();
 59         }
 60 
 61         return ret;
 62 }
 63 
 64 static int db8500_regulator_is_enabled(struct regulator_dev *rdev)
 65 {
 66         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
 67 
 68         if (info == NULL)
 69                 return -EINVAL;
 70 
 71         dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):"
 72                 " %i\n", info->desc.name, info->is_enabled);
 73 
 74         return info->is_enabled;
 75 }
 76 
 77 /* db8500 regulator operations */
 78 static struct regulator_ops db8500_regulator_ops = {
 79         .enable                 = db8500_regulator_enable,
 80         .disable                = db8500_regulator_disable,
 81         .is_enabled             = db8500_regulator_is_enabled,
 82 };
 83 
 84 /*
 85  * EPOD control
 86  */
 87 static bool epod_on[NUM_EPOD_ID];
 88 static bool epod_ramret[NUM_EPOD_ID];
 89 
 90 static int enable_epod(u16 epod_id, bool ramret)
 91 {
 92         int ret;
 93 
 94         if (ramret) {
 95                 if (!epod_on[epod_id]) {
 96                         ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
 97                         if (ret < 0)
 98                                 return ret;
 99                 }
100                 epod_ramret[epod_id] = true;
101         } else {
102                 ret = prcmu_set_epod(epod_id, EPOD_STATE_ON);
103                 if (ret < 0)
104                         return ret;
105                 epod_on[epod_id] = true;
106         }
107 
108         return 0;
109 }
110 
111 static int disable_epod(u16 epod_id, bool ramret)
112 {
113         int ret;
114 
115         if (ramret) {
116                 if (!epod_on[epod_id]) {
117                         ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
118                         if (ret < 0)
119                                 return ret;
120                 }
121                 epod_ramret[epod_id] = false;
122         } else {
123                 if (epod_ramret[epod_id]) {
124                         ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
125                         if (ret < 0)
126                                 return ret;
127                 } else {
128                         ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
129                         if (ret < 0)
130                                 return ret;
131                 }
132                 epod_on[epod_id] = false;
133         }
134 
135         return 0;
136 }
137 
138 /*
139  * Regulator switch
140  */
141 static int db8500_regulator_switch_enable(struct regulator_dev *rdev)
142 {
143         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
144         int ret;
145 
146         if (info == NULL)
147                 return -EINVAL;
148 
149         dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n",
150                 info->desc.name);
151 
152         ret = enable_epod(info->epod_id, info->is_ramret);
153         if (ret < 0) {
154                 dev_err(rdev_get_dev(rdev),
155                         "regulator-switch-%s-enable: prcmu call failed\n",
156                         info->desc.name);
157                 goto out;
158         }
159 
160         info->is_enabled = true;
161 out:
162         return ret;
163 }
164 
165 static int db8500_regulator_switch_disable(struct regulator_dev *rdev)
166 {
167         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
168         int ret;
169 
170         if (info == NULL)
171                 return -EINVAL;
172 
173         dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n",
174                 info->desc.name);
175 
176         ret = disable_epod(info->epod_id, info->is_ramret);
177         if (ret < 0) {
178                 dev_err(rdev_get_dev(rdev),
179                         "regulator_switch-%s-disable: prcmu call failed\n",
180                         info->desc.name);
181                 goto out;
182         }
183 
184         info->is_enabled = 0;
185 out:
186         return ret;
187 }
188 
189 static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev)
190 {
191         struct dbx500_regulator_info *info = rdev_get_drvdata(rdev);
192 
193         if (info == NULL)
194                 return -EINVAL;
195 
196         dev_vdbg(rdev_get_dev(rdev),
197                 "regulator-switch-%s-is_enabled (is_enabled): %i\n",
198                 info->desc.name, info->is_enabled);
199 
200         return info->is_enabled;
201 }
202 
203 static struct regulator_ops db8500_regulator_switch_ops = {
204         .enable                 = db8500_regulator_switch_enable,
205         .disable                = db8500_regulator_switch_disable,
206         .is_enabled             = db8500_regulator_switch_is_enabled,
207 };
208 
209 /*
210  * Regulator information
211  */
212 static struct dbx500_regulator_info
213 dbx500_regulator_info[DB8500_NUM_REGULATORS] = {
214         [DB8500_REGULATOR_VAPE] = {
215                 .desc = {
216                         .name   = "db8500-vape",
217                         .id     = DB8500_REGULATOR_VAPE,
218                         .ops    = &db8500_regulator_ops,
219                         .type   = REGULATOR_VOLTAGE,
220                         .owner  = THIS_MODULE,
221                 },
222         },
223         [DB8500_REGULATOR_VARM] = {
224                 .desc = {
225                         .name   = "db8500-varm",
226                         .id     = DB8500_REGULATOR_VARM,
227                         .ops    = &db8500_regulator_ops,
228                         .type   = REGULATOR_VOLTAGE,
229                         .owner  = THIS_MODULE,
230                 },
231         },
232         [DB8500_REGULATOR_VMODEM] = {
233                 .desc = {
234                         .name   = "db8500-vmodem",
235                         .id     = DB8500_REGULATOR_VMODEM,
236                         .ops    = &db8500_regulator_ops,
237                         .type   = REGULATOR_VOLTAGE,
238                         .owner  = THIS_MODULE,
239                 },
240         },
241         [DB8500_REGULATOR_VPLL] = {
242                 .desc = {
243                         .name   = "db8500-vpll",
244                         .id     = DB8500_REGULATOR_VPLL,
245                         .ops    = &db8500_regulator_ops,
246                         .type   = REGULATOR_VOLTAGE,
247                         .owner  = THIS_MODULE,
248                 },
249         },
250         [DB8500_REGULATOR_VSMPS1] = {
251                 .desc = {
252                         .name   = "db8500-vsmps1",
253                         .id     = DB8500_REGULATOR_VSMPS1,
254                         .ops    = &db8500_regulator_ops,
255                         .type   = REGULATOR_VOLTAGE,
256                         .owner  = THIS_MODULE,
257                 },
258         },
259         [DB8500_REGULATOR_VSMPS2] = {
260                 .desc = {
261                         .name   = "db8500-vsmps2",
262                         .id     = DB8500_REGULATOR_VSMPS2,
263                         .ops    = &db8500_regulator_ops,
264                         .type   = REGULATOR_VOLTAGE,
265                         .owner  = THIS_MODULE,
266                 },
267                 .exclude_from_power_state = true,
268         },
269         [DB8500_REGULATOR_VSMPS3] = {
270                 .desc = {
271                         .name   = "db8500-vsmps3",
272                         .id     = DB8500_REGULATOR_VSMPS3,
273                         .ops    = &db8500_regulator_ops,
274                         .type   = REGULATOR_VOLTAGE,
275                         .owner  = THIS_MODULE,
276                 },
277         },
278         [DB8500_REGULATOR_VRF1] = {
279                 .desc = {
280                         .name   = "db8500-vrf1",
281                         .id     = DB8500_REGULATOR_VRF1,
282                         .ops    = &db8500_regulator_ops,
283                         .type   = REGULATOR_VOLTAGE,
284                         .owner  = THIS_MODULE,
285                 },
286         },
287         [DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
288                 .desc = {
289                         .name   = "db8500-sva-mmdsp",
290                         .id     = DB8500_REGULATOR_SWITCH_SVAMMDSP,
291                         .ops    = &db8500_regulator_switch_ops,
292                         .type   = REGULATOR_VOLTAGE,
293                         .owner  = THIS_MODULE,
294                 },
295                 .epod_id = EPOD_ID_SVAMMDSP,
296         },
297         [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
298                 .desc = {
299                         .name   = "db8500-sva-mmdsp-ret",
300                         .id     = DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
301                         .ops    = &db8500_regulator_switch_ops,
302                         .type   = REGULATOR_VOLTAGE,
303                         .owner  = THIS_MODULE,
304                 },
305                 .epod_id = EPOD_ID_SVAMMDSP,
306                 .is_ramret = true,
307         },
308         [DB8500_REGULATOR_SWITCH_SVAPIPE] = {
309                 .desc = {
310                         .name   = "db8500-sva-pipe",
311                         .id     = DB8500_REGULATOR_SWITCH_SVAPIPE,
312                         .ops    = &db8500_regulator_switch_ops,
313                         .type   = REGULATOR_VOLTAGE,
314                         .owner  = THIS_MODULE,
315                 },
316                 .epod_id = EPOD_ID_SVAPIPE,
317         },
318         [DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
319                 .desc = {
320                         .name   = "db8500-sia-mmdsp",
321                         .id     = DB8500_REGULATOR_SWITCH_SIAMMDSP,
322                         .ops    = &db8500_regulator_switch_ops,
323                         .type   = REGULATOR_VOLTAGE,
324                         .owner  = THIS_MODULE,
325                 },
326                 .epod_id = EPOD_ID_SIAMMDSP,
327         },
328         [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
329                 .desc = {
330                         .name   = "db8500-sia-mmdsp-ret",
331                         .id     = DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
332                         .ops    = &db8500_regulator_switch_ops,
333                         .type   = REGULATOR_VOLTAGE,
334                         .owner  = THIS_MODULE,
335                 },
336                 .epod_id = EPOD_ID_SIAMMDSP,
337                 .is_ramret = true,
338         },
339         [DB8500_REGULATOR_SWITCH_SIAPIPE] = {
340                 .desc = {
341                         .name   = "db8500-sia-pipe",
342                         .id     = DB8500_REGULATOR_SWITCH_SIAPIPE,
343                         .ops    = &db8500_regulator_switch_ops,
344                         .type   = REGULATOR_VOLTAGE,
345                         .owner  = THIS_MODULE,
346                 },
347                 .epod_id = EPOD_ID_SIAPIPE,
348         },
349         [DB8500_REGULATOR_SWITCH_SGA] = {
350                 .desc = {
351                         .name   = "db8500-sga",
352                         .id     = DB8500_REGULATOR_SWITCH_SGA,
353                         .ops    = &db8500_regulator_switch_ops,
354                         .type   = REGULATOR_VOLTAGE,
355                         .owner  = THIS_MODULE,
356                 },
357                 .epod_id = EPOD_ID_SGA,
358         },
359         [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
360                 .desc = {
361                         .name   = "db8500-b2r2-mcde",
362                         .id     = DB8500_REGULATOR_SWITCH_B2R2_MCDE,
363                         .ops    = &db8500_regulator_switch_ops,
364                         .type   = REGULATOR_VOLTAGE,
365                         .owner  = THIS_MODULE,
366                 },
367                 .epod_id = EPOD_ID_B2R2_MCDE,
368         },
369         [DB8500_REGULATOR_SWITCH_ESRAM12] = {
370                 .desc = {
371                         .name   = "db8500-esram12",
372                         .id     = DB8500_REGULATOR_SWITCH_ESRAM12,
373                         .ops    = &db8500_regulator_switch_ops,
374                         .type   = REGULATOR_VOLTAGE,
375                         .owner  = THIS_MODULE,
376                 },
377                 .epod_id        = EPOD_ID_ESRAM12,
378                 .is_enabled     = true,
379         },
380         [DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
381                 .desc = {
382                         .name   = "db8500-esram12-ret",
383                         .id     = DB8500_REGULATOR_SWITCH_ESRAM12RET,
384                         .ops    = &db8500_regulator_switch_ops,
385                         .type   = REGULATOR_VOLTAGE,
386                         .owner  = THIS_MODULE,
387                 },
388                 .epod_id = EPOD_ID_ESRAM12,
389                 .is_ramret = true,
390         },
391         [DB8500_REGULATOR_SWITCH_ESRAM34] = {
392                 .desc = {
393                         .name   = "db8500-esram34",
394                         .id     = DB8500_REGULATOR_SWITCH_ESRAM34,
395                         .ops    = &db8500_regulator_switch_ops,
396                         .type   = REGULATOR_VOLTAGE,
397                         .owner  = THIS_MODULE,
398                 },
399                 .epod_id        = EPOD_ID_ESRAM34,
400                 .is_enabled     = true,
401         },
402         [DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
403                 .desc = {
404                         .name   = "db8500-esram34-ret",
405                         .id     = DB8500_REGULATOR_SWITCH_ESRAM34RET,
406                         .ops    = &db8500_regulator_switch_ops,
407                         .type   = REGULATOR_VOLTAGE,
408                         .owner  = THIS_MODULE,
409                 },
410                 .epod_id = EPOD_ID_ESRAM34,
411                 .is_ramret = true,
412         },
413 };
414 
415 static int db8500_regulator_register(struct platform_device *pdev,
416                                         struct regulator_init_data *init_data,
417                                         int id,
418                                         struct device_node *np)
419 {
420         struct dbx500_regulator_info *info;
421         struct regulator_config config = { };
422         int err;
423 
424         /* assign per-regulator data */
425         info = &dbx500_regulator_info[id];
426         info->dev = &pdev->dev;
427 
428         config.dev = &pdev->dev;
429         config.init_data = init_data;
430         config.driver_data = info;
431         config.of_node = np;
432 
433         /* register with the regulator framework */
434         info->rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
435         if (IS_ERR(info->rdev)) {
436                 err = PTR_ERR(info->rdev);
437                 dev_err(&pdev->dev, "failed to register %s: err %i\n",
438                         info->desc.name, err);
439                 return err;
440         }
441 
442         dev_dbg(rdev_get_dev(info->rdev),
443                 "regulator-%s-probed\n", info->desc.name);
444 
445         return 0;
446 }
447 
448 static struct of_regulator_match db8500_regulator_matches[] = {
449         { .name = "db8500_vape",          .driver_data = (void *) DB8500_REGULATOR_VAPE, },
450         { .name = "db8500_varm",          .driver_data = (void *) DB8500_REGULATOR_VARM, },
451         { .name = "db8500_vmodem",        .driver_data = (void *) DB8500_REGULATOR_VMODEM, },
452         { .name = "db8500_vpll",          .driver_data = (void *) DB8500_REGULATOR_VPLL, },
453         { .name = "db8500_vsmps1",        .driver_data = (void *) DB8500_REGULATOR_VSMPS1, },
454         { .name = "db8500_vsmps2",        .driver_data = (void *) DB8500_REGULATOR_VSMPS2, },
455         { .name = "db8500_vsmps3",        .driver_data = (void *) DB8500_REGULATOR_VSMPS3, },
456         { .name = "db8500_vrf1",          .driver_data = (void *) DB8500_REGULATOR_VRF1, },
457         { .name = "db8500_sva_mmdsp",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAMMDSP, },
458         { .name = "db8500_sva_mmdsp_ret", .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAMMDSPRET, },
459         { .name = "db8500_sva_pipe",      .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAPIPE, },
460         { .name = "db8500_sia_mmdsp",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAMMDSP, },
461         { .name = "db8500_sia_mmdsp_ret", .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAMMDSPRET, },
462         { .name = "db8500_sia_pipe",      .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAPIPE, },
463         { .name = "db8500_sga",           .driver_data = (void *) DB8500_REGULATOR_SWITCH_SGA, },
464         { .name = "db8500_b2r2_mcde",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_B2R2_MCDE, },
465         { .name = "db8500_esram12",       .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM12, },
466         { .name = "db8500_esram12_ret",   .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM12RET, },
467         { .name = "db8500_esram34",       .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM34, },
468         { .name = "db8500_esram34_ret",   .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM34RET, },
469 };
470 
471 static int
472 db8500_regulator_of_probe(struct platform_device *pdev,
473                         struct device_node *np)
474 {
475         int i, err;
476 
477         for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
478                 err = db8500_regulator_register(
479                         pdev, db8500_regulator_matches[i].init_data,
480                         i, db8500_regulator_matches[i].of_node);
481                 if (err)
482                         return err;
483         }
484 
485         return 0;
486 }
487 
488 static int db8500_regulator_probe(struct platform_device *pdev)
489 {
490         struct regulator_init_data *db8500_init_data =
491                                         dev_get_platdata(&pdev->dev);
492         struct device_node *np = pdev->dev.of_node;
493         int i, err;
494 
495         /* register all regulators */
496         if (np) {
497                 err = of_regulator_match(&pdev->dev, np,
498                                         db8500_regulator_matches,
499                                         ARRAY_SIZE(db8500_regulator_matches));
500                 if (err < 0) {
501                         dev_err(&pdev->dev,
502                                 "Error parsing regulator init data: %d\n", err);
503                         return err;
504                 }
505 
506                 err = db8500_regulator_of_probe(pdev, np);
507                 if (err)
508                         return err;
509         } else {
510                 for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
511                         err = db8500_regulator_register(pdev,
512                                                         &db8500_init_data[i],
513                                                         i, NULL);
514                         if (err)
515                                 return err;
516                 }
517         }
518 
519         err = ux500_regulator_debug_init(pdev,
520                                          dbx500_regulator_info,
521                                          ARRAY_SIZE(dbx500_regulator_info));
522         return 0;
523 }
524 
525 static int db8500_regulator_remove(struct platform_device *pdev)
526 {
527         ux500_regulator_debug_exit();
528 
529         return 0;
530 }
531 
532 static struct platform_driver db8500_regulator_driver = {
533         .driver = {
534                 .name = "db8500-prcmu-regulators",
535                 .owner = THIS_MODULE,
536         },
537         .probe = db8500_regulator_probe,
538         .remove = db8500_regulator_remove,
539 };
540 
541 static int __init db8500_regulator_init(void)
542 {
543         return platform_driver_register(&db8500_regulator_driver);
544 }
545 
546 static void __exit db8500_regulator_exit(void)
547 {
548         platform_driver_unregister(&db8500_regulator_driver);
549 }
550 
551 arch_initcall(db8500_regulator_init);
552 module_exit(db8500_regulator_exit);
553 
554 MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
555 MODULE_DESCRIPTION("DB8500 regulator driver");
556 MODULE_LICENSE("GPL v2");
557 

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