2 * Copyright (C) ST-Ericsson SA 2010
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
8 * Power domain regulators on DB8500
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>
22 * power state reference count
24 static int power_state_active_cnt; /* will initialize to zero */
25 static DEFINE_SPINLOCK(power_state_active_lock);
27 static void power_state_active_enable(void)
31 spin_lock_irqsave(&power_state_active_lock, flags);
32 power_state_active_cnt++;
33 spin_unlock_irqrestore(&power_state_active_lock, flags);
36 static int power_state_active_disable(void)
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");
48 power_state_active_cnt--;
50 spin_unlock_irqrestore(&power_state_active_lock, flags);
55 * Exported interface for CPUIdle only. This function is called when interrupts
56 * are turned off. Hence, no locking.
58 int power_state_active_is_enabled(void)
60 return (power_state_active_cnt > 0);
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)
74 struct db8500_regulator_info {
76 struct regulator_desc desc;
77 struct regulator_dev *rdev;
81 bool exclude_from_power_state;
82 unsigned int operating_point;
85 static int db8500_regulator_enable(struct regulator_dev *rdev)
87 struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
92 dev_vdbg(rdev_get_dev(rdev), "regulator-%s-enable\n",
95 info->is_enabled = true;
96 if (!info->exclude_from_power_state)
97 power_state_active_enable();
102 static int db8500_regulator_disable(struct regulator_dev *rdev)
104 struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
110 dev_vdbg(rdev_get_dev(rdev), "regulator-%s-disable\n",
113 info->is_enabled = false;
114 if (!info->exclude_from_power_state)
115 ret = power_state_active_disable();
120 static int db8500_regulator_is_enabled(struct regulator_dev *rdev)
122 struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
127 dev_vdbg(rdev_get_dev(rdev), "regulator-%s-is_enabled (is_enabled):"
128 " %i\n", info->desc.name, info->is_enabled);
130 return info->is_enabled;
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,
143 static bool epod_on[NUM_EPOD_ID];
144 static bool epod_ramret[NUM_EPOD_ID];
146 static int enable_epod(u16 epod_id, bool ramret)
151 if (!epod_on[epod_id]) {
152 ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
156 epod_ramret[epod_id] = true;
158 ret = prcmu_set_epod(epod_id, EPOD_STATE_ON);
161 epod_on[epod_id] = true;
167 static int disable_epod(u16 epod_id, bool ramret)
172 if (!epod_on[epod_id]) {
173 ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
177 epod_ramret[epod_id] = false;
179 if (epod_ramret[epod_id]) {
180 ret = prcmu_set_epod(epod_id, EPOD_STATE_RAMRET);
184 ret = prcmu_set_epod(epod_id, EPOD_STATE_OFF);
188 epod_on[epod_id] = false;
197 static int db8500_regulator_switch_enable(struct regulator_dev *rdev)
199 struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
205 dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-enable\n",
208 ret = enable_epod(info->epod_id, info->is_ramret);
210 dev_err(rdev_get_dev(rdev),
211 "regulator-switch-%s-enable: prcmu call failed\n",
216 info->is_enabled = true;
221 static int db8500_regulator_switch_disable(struct regulator_dev *rdev)
223 struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
229 dev_vdbg(rdev_get_dev(rdev), "regulator-switch-%s-disable\n",
232 ret = disable_epod(info->epod_id, info->is_ramret);
234 dev_err(rdev_get_dev(rdev),
235 "regulator_switch-%s-disable: prcmu call failed\n",
240 info->is_enabled = 0;
245 static int db8500_regulator_switch_is_enabled(struct regulator_dev *rdev)
247 struct db8500_regulator_info *info = rdev_get_drvdata(rdev);
252 dev_vdbg(rdev_get_dev(rdev),
253 "regulator-switch-%s-is_enabled (is_enabled): %i\n",
254 info->desc.name, info->is_enabled);
256 return info->is_enabled;
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,
266 * Regulator information
268 static struct db8500_regulator_info
269 db8500_regulator_info[DB8500_NUM_REGULATORS] = {
270 [DB8500_REGULATOR_VAPE] = {
272 .name = "db8500-vape",
273 .id = DB8500_REGULATOR_VAPE,
274 .ops = &db8500_regulator_ops,
275 .type = REGULATOR_VOLTAGE,
276 .owner = THIS_MODULE,
279 [DB8500_REGULATOR_VARM] = {
281 .name = "db8500-varm",
282 .id = DB8500_REGULATOR_VARM,
283 .ops = &db8500_regulator_ops,
284 .type = REGULATOR_VOLTAGE,
285 .owner = THIS_MODULE,
288 [DB8500_REGULATOR_VMODEM] = {
290 .name = "db8500-vmodem",
291 .id = DB8500_REGULATOR_VMODEM,
292 .ops = &db8500_regulator_ops,
293 .type = REGULATOR_VOLTAGE,
294 .owner = THIS_MODULE,
297 [DB8500_REGULATOR_VPLL] = {
299 .name = "db8500-vpll",
300 .id = DB8500_REGULATOR_VPLL,
301 .ops = &db8500_regulator_ops,
302 .type = REGULATOR_VOLTAGE,
303 .owner = THIS_MODULE,
306 [DB8500_REGULATOR_VSMPS1] = {
308 .name = "db8500-vsmps1",
309 .id = DB8500_REGULATOR_VSMPS1,
310 .ops = &db8500_regulator_ops,
311 .type = REGULATOR_VOLTAGE,
312 .owner = THIS_MODULE,
315 [DB8500_REGULATOR_VSMPS2] = {
317 .name = "db8500-vsmps2",
318 .id = DB8500_REGULATOR_VSMPS2,
319 .ops = &db8500_regulator_ops,
320 .type = REGULATOR_VOLTAGE,
321 .owner = THIS_MODULE,
323 .exclude_from_power_state = true,
325 [DB8500_REGULATOR_VSMPS3] = {
327 .name = "db8500-vsmps3",
328 .id = DB8500_REGULATOR_VSMPS3,
329 .ops = &db8500_regulator_ops,
330 .type = REGULATOR_VOLTAGE,
331 .owner = THIS_MODULE,
334 [DB8500_REGULATOR_VRF1] = {
336 .name = "db8500-vrf1",
337 .id = DB8500_REGULATOR_VRF1,
338 .ops = &db8500_regulator_ops,
339 .type = REGULATOR_VOLTAGE,
340 .owner = THIS_MODULE,
343 [DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
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,
351 .epod_id = EPOD_ID_SVAMMDSP,
353 [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
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,
361 .epod_id = EPOD_ID_SVAMMDSP,
364 [DB8500_REGULATOR_SWITCH_SVAPIPE] = {
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,
372 .epod_id = EPOD_ID_SVAPIPE,
374 [DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
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,
382 .epod_id = EPOD_ID_SIAMMDSP,
384 [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
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,
392 .epod_id = EPOD_ID_SIAMMDSP,
395 [DB8500_REGULATOR_SWITCH_SIAPIPE] = {
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,
403 .epod_id = EPOD_ID_SIAPIPE,
405 [DB8500_REGULATOR_SWITCH_SGA] = {
407 .name = "db8500-sga",
408 .id = DB8500_REGULATOR_SWITCH_SGA,
409 .ops = &db8500_regulator_switch_ops,
410 .type = REGULATOR_VOLTAGE,
411 .owner = THIS_MODULE,
413 .epod_id = EPOD_ID_SGA,
415 [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
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,
423 .epod_id = EPOD_ID_B2R2_MCDE,
425 [DB8500_REGULATOR_SWITCH_ESRAM12] = {
427 .name = "db8500-esram12",
428 .id = DB8500_REGULATOR_SWITCH_ESRAM12,
429 .ops = &db8500_regulator_switch_ops,
430 .type = REGULATOR_VOLTAGE,
431 .owner = THIS_MODULE,
433 .epod_id = EPOD_ID_ESRAM12,
436 [DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
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,
444 .epod_id = EPOD_ID_ESRAM12,
447 [DB8500_REGULATOR_SWITCH_ESRAM34] = {
449 .name = "db8500-esram34",
450 .id = DB8500_REGULATOR_SWITCH_ESRAM34,
451 .ops = &db8500_regulator_switch_ops,
452 .type = REGULATOR_VOLTAGE,
453 .owner = THIS_MODULE,
455 .epod_id = EPOD_ID_ESRAM34,
458 [DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
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,
466 .epod_id = EPOD_ID_ESRAM34,
471 static int __devinit db8500_regulator_probe(struct platform_device *pdev)
473 struct regulator_init_data *db8500_init_data =
474 dev_get_platdata(&pdev->dev);
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];
482 /* assign per-regulator data */
483 info = &db8500_regulator_info[i];
484 info->dev = &pdev->dev;
486 /* register with the regulator framework */
487 info->rdev = regulator_register(&info->desc, &pdev->dev,
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);
494 /* if failing, unregister all earlier regulators */
496 info = &db8500_regulator_info[i];
497 regulator_unregister(info->rdev);
502 dev_dbg(rdev_get_dev(info->rdev),
503 "regulator-%s-probed\n", info->desc.name);
509 static int __exit db8500_regulator_remove(struct platform_device *pdev)
513 for (i = 0; i < ARRAY_SIZE(db8500_regulator_info); i++) {
514 struct db8500_regulator_info *info;
515 info = &db8500_regulator_info[i];
517 dev_vdbg(rdev_get_dev(info->rdev),
518 "regulator-%s-remove\n", info->desc.name);
520 regulator_unregister(info->rdev);
526 static struct platform_driver db8500_regulator_driver = {
528 .name = "db8500-prcmu-regulators",
529 .owner = THIS_MODULE,
531 .probe = db8500_regulator_probe,
532 .remove = __exit_p(db8500_regulator_remove),
535 static int __init db8500_regulator_init(void)
537 return platform_driver_register(&db8500_regulator_driver);
540 static void __exit db8500_regulator_exit(void)
542 platform_driver_unregister(&db8500_regulator_driver);
545 arch_initcall(db8500_regulator_init);
546 module_exit(db8500_regulator_exit);
548 MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
549 MODULE_DESCRIPTION("DB8500 regulator driver");
550 MODULE_LICENSE("GPL v2");