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
25static 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
44static 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
64static 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 */
78static 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 */
87static bool epod_on[NUM_EPOD_ID];
88static bool epod_ramret[NUM_EPOD_ID];
89
90static 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
111static 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 */
141static 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;
161out:
162	return ret;
163}
164
165static 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;
185out:
186	return ret;
187}
188
189static 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
203static 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 */
212static struct dbx500_regulator_info
213dbx500_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			.fixed_uV = 1800000,
267			.n_voltages = 1,
268		},
269		.exclude_from_power_state = true,
270	},
271	[DB8500_REGULATOR_VSMPS3] = {
272		.desc = {
273			.name	= "db8500-vsmps3",
274			.id	= DB8500_REGULATOR_VSMPS3,
275			.ops	= &db8500_regulator_ops,
276			.type	= REGULATOR_VOLTAGE,
277			.owner	= THIS_MODULE,
278		},
279	},
280	[DB8500_REGULATOR_VRF1] = {
281		.desc = {
282			.name	= "db8500-vrf1",
283			.id	= DB8500_REGULATOR_VRF1,
284			.ops	= &db8500_regulator_ops,
285			.type	= REGULATOR_VOLTAGE,
286			.owner	= THIS_MODULE,
287		},
288	},
289	[DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
290		.desc = {
291			.name	= "db8500-sva-mmdsp",
292			.id	= DB8500_REGULATOR_SWITCH_SVAMMDSP,
293			.ops	= &db8500_regulator_switch_ops,
294			.type	= REGULATOR_VOLTAGE,
295			.owner	= THIS_MODULE,
296		},
297		.epod_id = EPOD_ID_SVAMMDSP,
298	},
299	[DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
300		.desc = {
301			.name	= "db8500-sva-mmdsp-ret",
302			.id	= DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
303			.ops	= &db8500_regulator_switch_ops,
304			.type	= REGULATOR_VOLTAGE,
305			.owner	= THIS_MODULE,
306		},
307		.epod_id = EPOD_ID_SVAMMDSP,
308		.is_ramret = true,
309	},
310	[DB8500_REGULATOR_SWITCH_SVAPIPE] = {
311		.desc = {
312			.name	= "db8500-sva-pipe",
313			.id	= DB8500_REGULATOR_SWITCH_SVAPIPE,
314			.ops	= &db8500_regulator_switch_ops,
315			.type	= REGULATOR_VOLTAGE,
316			.owner	= THIS_MODULE,
317		},
318		.epod_id = EPOD_ID_SVAPIPE,
319	},
320	[DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
321		.desc = {
322			.name	= "db8500-sia-mmdsp",
323			.id	= DB8500_REGULATOR_SWITCH_SIAMMDSP,
324			.ops	= &db8500_regulator_switch_ops,
325			.type	= REGULATOR_VOLTAGE,
326			.owner	= THIS_MODULE,
327		},
328		.epod_id = EPOD_ID_SIAMMDSP,
329	},
330	[DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
331		.desc = {
332			.name	= "db8500-sia-mmdsp-ret",
333			.id	= DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
334			.ops	= &db8500_regulator_switch_ops,
335			.type	= REGULATOR_VOLTAGE,
336			.owner	= THIS_MODULE,
337		},
338		.epod_id = EPOD_ID_SIAMMDSP,
339		.is_ramret = true,
340	},
341	[DB8500_REGULATOR_SWITCH_SIAPIPE] = {
342		.desc = {
343			.name	= "db8500-sia-pipe",
344			.id	= DB8500_REGULATOR_SWITCH_SIAPIPE,
345			.ops	= &db8500_regulator_switch_ops,
346			.type	= REGULATOR_VOLTAGE,
347			.owner	= THIS_MODULE,
348		},
349		.epod_id = EPOD_ID_SIAPIPE,
350	},
351	[DB8500_REGULATOR_SWITCH_SGA] = {
352		.desc = {
353			.name	= "db8500-sga",
354			.id	= DB8500_REGULATOR_SWITCH_SGA,
355			.ops	= &db8500_regulator_switch_ops,
356			.type	= REGULATOR_VOLTAGE,
357			.owner	= THIS_MODULE,
358		},
359		.epod_id = EPOD_ID_SGA,
360	},
361	[DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
362		.desc = {
363			.name	= "db8500-b2r2-mcde",
364			.id	= DB8500_REGULATOR_SWITCH_B2R2_MCDE,
365			.ops	= &db8500_regulator_switch_ops,
366			.type	= REGULATOR_VOLTAGE,
367			.owner	= THIS_MODULE,
368		},
369		.epod_id = EPOD_ID_B2R2_MCDE,
370	},
371	[DB8500_REGULATOR_SWITCH_ESRAM12] = {
372		.desc = {
373			.name	= "db8500-esram12",
374			.id	= DB8500_REGULATOR_SWITCH_ESRAM12,
375			.ops	= &db8500_regulator_switch_ops,
376			.type	= REGULATOR_VOLTAGE,
377			.owner	= THIS_MODULE,
378		},
379		.epod_id	= EPOD_ID_ESRAM12,
380		.is_enabled	= true,
381	},
382	[DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
383		.desc = {
384			.name	= "db8500-esram12-ret",
385			.id	= DB8500_REGULATOR_SWITCH_ESRAM12RET,
386			.ops	= &db8500_regulator_switch_ops,
387			.type	= REGULATOR_VOLTAGE,
388			.owner	= THIS_MODULE,
389		},
390		.epod_id = EPOD_ID_ESRAM12,
391		.is_ramret = true,
392	},
393	[DB8500_REGULATOR_SWITCH_ESRAM34] = {
394		.desc = {
395			.name	= "db8500-esram34",
396			.id	= DB8500_REGULATOR_SWITCH_ESRAM34,
397			.ops	= &db8500_regulator_switch_ops,
398			.type	= REGULATOR_VOLTAGE,
399			.owner	= THIS_MODULE,
400		},
401		.epod_id	= EPOD_ID_ESRAM34,
402		.is_enabled	= true,
403	},
404	[DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
405		.desc = {
406			.name	= "db8500-esram34-ret",
407			.id	= DB8500_REGULATOR_SWITCH_ESRAM34RET,
408			.ops	= &db8500_regulator_switch_ops,
409			.type	= REGULATOR_VOLTAGE,
410			.owner	= THIS_MODULE,
411		},
412		.epod_id = EPOD_ID_ESRAM34,
413		.is_ramret = true,
414	},
415};
416
417static int db8500_regulator_register(struct platform_device *pdev,
418					struct regulator_init_data *init_data,
419					int id,
420					struct device_node *np)
421{
422	struct dbx500_regulator_info *info;
423	struct regulator_config config = { };
424	int err;
425
426	/* assign per-regulator data */
427	info = &dbx500_regulator_info[id];
428	info->dev = &pdev->dev;
429
430	config.dev = &pdev->dev;
431	config.init_data = init_data;
432	config.driver_data = info;
433	config.of_node = np;
434
435	/* register with the regulator framework */
436	info->rdev = devm_regulator_register(&pdev->dev, &info->desc, &config);
437	if (IS_ERR(info->rdev)) {
438		err = PTR_ERR(info->rdev);
439		dev_err(&pdev->dev, "failed to register %s: err %i\n",
440			info->desc.name, err);
441		return err;
442	}
443
444	dev_dbg(rdev_get_dev(info->rdev),
445		"regulator-%s-probed\n", info->desc.name);
446
447	return 0;
448}
449
450static struct of_regulator_match db8500_regulator_matches[] = {
451	{ .name	= "db8500_vape",          .driver_data = (void *) DB8500_REGULATOR_VAPE, },
452	{ .name	= "db8500_varm",          .driver_data = (void *) DB8500_REGULATOR_VARM, },
453	{ .name	= "db8500_vmodem",        .driver_data = (void *) DB8500_REGULATOR_VMODEM, },
454	{ .name	= "db8500_vpll",          .driver_data = (void *) DB8500_REGULATOR_VPLL, },
455	{ .name	= "db8500_vsmps1",        .driver_data = (void *) DB8500_REGULATOR_VSMPS1, },
456	{ .name	= "db8500_vsmps2",        .driver_data = (void *) DB8500_REGULATOR_VSMPS2, },
457	{ .name	= "db8500_vsmps3",        .driver_data = (void *) DB8500_REGULATOR_VSMPS3, },
458	{ .name	= "db8500_vrf1",          .driver_data = (void *) DB8500_REGULATOR_VRF1, },
459	{ .name	= "db8500_sva_mmdsp",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAMMDSP, },
460	{ .name	= "db8500_sva_mmdsp_ret", .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAMMDSPRET, },
461	{ .name	= "db8500_sva_pipe",      .driver_data = (void *) DB8500_REGULATOR_SWITCH_SVAPIPE, },
462	{ .name	= "db8500_sia_mmdsp",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAMMDSP, },
463	{ .name	= "db8500_sia_mmdsp_ret", .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAMMDSPRET, },
464	{ .name	= "db8500_sia_pipe",      .driver_data = (void *) DB8500_REGULATOR_SWITCH_SIAPIPE, },
465	{ .name	= "db8500_sga",           .driver_data = (void *) DB8500_REGULATOR_SWITCH_SGA, },
466	{ .name	= "db8500_b2r2_mcde",     .driver_data = (void *) DB8500_REGULATOR_SWITCH_B2R2_MCDE, },
467	{ .name	= "db8500_esram12",       .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM12, },
468	{ .name	= "db8500_esram12_ret",   .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM12RET, },
469	{ .name	= "db8500_esram34",       .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM34, },
470	{ .name	= "db8500_esram34_ret",   .driver_data = (void *) DB8500_REGULATOR_SWITCH_ESRAM34RET, },
471};
472
473static int
474db8500_regulator_of_probe(struct platform_device *pdev,
475			struct device_node *np)
476{
477	int i, err;
478
479	for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
480		err = db8500_regulator_register(
481			pdev, db8500_regulator_matches[i].init_data,
482			i, db8500_regulator_matches[i].of_node);
483		if (err)
484			return err;
485	}
486
487	return 0;
488}
489
490static int db8500_regulator_probe(struct platform_device *pdev)
491{
492	struct regulator_init_data *db8500_init_data =
493					dev_get_platdata(&pdev->dev);
494	struct device_node *np = pdev->dev.of_node;
495	int i, err;
496
497	/* register all regulators */
498	if (np) {
499		err = of_regulator_match(&pdev->dev, np,
500					db8500_regulator_matches,
501					ARRAY_SIZE(db8500_regulator_matches));
502		if (err < 0) {
503			dev_err(&pdev->dev,
504				"Error parsing regulator init data: %d\n", err);
505			return err;
506		}
507
508		err = db8500_regulator_of_probe(pdev, np);
509		if (err)
510			return err;
511	} else {
512		for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
513			err = db8500_regulator_register(pdev,
514							&db8500_init_data[i],
515							i, NULL);
516			if (err)
517				return err;
518		}
519	}
520
521	err = ux500_regulator_debug_init(pdev,
522					 dbx500_regulator_info,
523					 ARRAY_SIZE(dbx500_regulator_info));
524	return 0;
525}
526
527static int db8500_regulator_remove(struct platform_device *pdev)
528{
529	ux500_regulator_debug_exit();
530
531	return 0;
532}
533
534static struct platform_driver db8500_regulator_driver = {
535	.driver = {
536		.name = "db8500-prcmu-regulators",
537	},
538	.probe = db8500_regulator_probe,
539	.remove = db8500_regulator_remove,
540};
541
542static int __init db8500_regulator_init(void)
543{
544	return platform_driver_register(&db8500_regulator_driver);
545}
546
547static void __exit db8500_regulator_exit(void)
548{
549	platform_driver_unregister(&db8500_regulator_driver);
550}
551
552arch_initcall(db8500_regulator_init);
553module_exit(db8500_regulator_exit);
554
555MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
556MODULE_DESCRIPTION("DB8500 regulator driver");
557MODULE_LICENSE("GPL v2");
558