1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) ST-Ericsson SA 2010
4 *
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
db8500_regulator_enable(struct regulator_dev * rdev)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
db8500_regulator_disable(struct regulator_dev * rdev)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
db8500_regulator_is_enabled(struct regulator_dev * rdev)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 const 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
enable_epod(u16 epod_id,bool ramret)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
disable_epod(u16 epod_id,bool ramret)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 */
db8500_regulator_switch_enable(struct regulator_dev * rdev)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
db8500_regulator_switch_disable(struct regulator_dev * rdev)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 = false;
185 out:
186 return ret;
187 }
188
db8500_regulator_switch_is_enabled(struct regulator_dev * rdev)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 const 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 .of_match = of_match_ptr("db8500_vape"),
218 .id = DB8500_REGULATOR_VAPE,
219 .ops = &db8500_regulator_ops,
220 .type = REGULATOR_VOLTAGE,
221 .owner = THIS_MODULE,
222 },
223 },
224 [DB8500_REGULATOR_VARM] = {
225 .desc = {
226 .name = "db8500-varm",
227 .of_match = of_match_ptr("db8500_varm"),
228 .id = DB8500_REGULATOR_VARM,
229 .ops = &db8500_regulator_ops,
230 .type = REGULATOR_VOLTAGE,
231 .owner = THIS_MODULE,
232 },
233 },
234 [DB8500_REGULATOR_VMODEM] = {
235 .desc = {
236 .name = "db8500-vmodem",
237 .of_match = of_match_ptr("db8500_vmodem"),
238 .id = DB8500_REGULATOR_VMODEM,
239 .ops = &db8500_regulator_ops,
240 .type = REGULATOR_VOLTAGE,
241 .owner = THIS_MODULE,
242 },
243 },
244 [DB8500_REGULATOR_VPLL] = {
245 .desc = {
246 .name = "db8500-vpll",
247 .of_match = of_match_ptr("db8500_vpll"),
248 .id = DB8500_REGULATOR_VPLL,
249 .ops = &db8500_regulator_ops,
250 .type = REGULATOR_VOLTAGE,
251 .owner = THIS_MODULE,
252 },
253 },
254 [DB8500_REGULATOR_VSMPS1] = {
255 .desc = {
256 .name = "db8500-vsmps1",
257 .of_match = of_match_ptr("db8500_vsmps1"),
258 .id = DB8500_REGULATOR_VSMPS1,
259 .ops = &db8500_regulator_ops,
260 .type = REGULATOR_VOLTAGE,
261 .owner = THIS_MODULE,
262 },
263 },
264 [DB8500_REGULATOR_VSMPS2] = {
265 .desc = {
266 .name = "db8500-vsmps2",
267 .of_match = of_match_ptr("db8500_vsmps2"),
268 .id = DB8500_REGULATOR_VSMPS2,
269 .ops = &db8500_regulator_ops,
270 .type = REGULATOR_VOLTAGE,
271 .owner = THIS_MODULE,
272 .fixed_uV = 1800000,
273 .n_voltages = 1,
274 },
275 .exclude_from_power_state = true,
276 },
277 [DB8500_REGULATOR_VSMPS3] = {
278 .desc = {
279 .name = "db8500-vsmps3",
280 .of_match = of_match_ptr("db8500_vsmps3"),
281 .id = DB8500_REGULATOR_VSMPS3,
282 .ops = &db8500_regulator_ops,
283 .type = REGULATOR_VOLTAGE,
284 .owner = THIS_MODULE,
285 },
286 },
287 [DB8500_REGULATOR_VRF1] = {
288 .desc = {
289 .name = "db8500-vrf1",
290 .of_match = of_match_ptr("db8500_vrf1"),
291 .id = DB8500_REGULATOR_VRF1,
292 .ops = &db8500_regulator_ops,
293 .type = REGULATOR_VOLTAGE,
294 .owner = THIS_MODULE,
295 },
296 },
297 [DB8500_REGULATOR_SWITCH_SVAMMDSP] = {
298 .desc = {
299 .name = "db8500-sva-mmdsp",
300 .of_match = of_match_ptr("db8500_sva_mmdsp"),
301 .id = DB8500_REGULATOR_SWITCH_SVAMMDSP,
302 .ops = &db8500_regulator_switch_ops,
303 .type = REGULATOR_VOLTAGE,
304 .owner = THIS_MODULE,
305 },
306 .epod_id = EPOD_ID_SVAMMDSP,
307 },
308 [DB8500_REGULATOR_SWITCH_SVAMMDSPRET] = {
309 .desc = {
310 .name = "db8500-sva-mmdsp-ret",
311 .of_match = of_match_ptr("db8500_sva_mmdsp_ret"),
312 .id = DB8500_REGULATOR_SWITCH_SVAMMDSPRET,
313 .ops = &db8500_regulator_switch_ops,
314 .type = REGULATOR_VOLTAGE,
315 .owner = THIS_MODULE,
316 },
317 .epod_id = EPOD_ID_SVAMMDSP,
318 .is_ramret = true,
319 },
320 [DB8500_REGULATOR_SWITCH_SVAPIPE] = {
321 .desc = {
322 .name = "db8500-sva-pipe",
323 .of_match = of_match_ptr("db8500_sva_pipe"),
324 .id = DB8500_REGULATOR_SWITCH_SVAPIPE,
325 .ops = &db8500_regulator_switch_ops,
326 .type = REGULATOR_VOLTAGE,
327 .owner = THIS_MODULE,
328 },
329 .epod_id = EPOD_ID_SVAPIPE,
330 },
331 [DB8500_REGULATOR_SWITCH_SIAMMDSP] = {
332 .desc = {
333 .name = "db8500-sia-mmdsp",
334 .of_match = of_match_ptr("db8500_sia_mmdsp"),
335 .id = DB8500_REGULATOR_SWITCH_SIAMMDSP,
336 .ops = &db8500_regulator_switch_ops,
337 .type = REGULATOR_VOLTAGE,
338 .owner = THIS_MODULE,
339 },
340 .epod_id = EPOD_ID_SIAMMDSP,
341 },
342 [DB8500_REGULATOR_SWITCH_SIAMMDSPRET] = {
343 .desc = {
344 .name = "db8500-sia-mmdsp-ret",
345 .of_match = of_match_ptr("db8500_sia_mmdsp_ret"),
346 .id = DB8500_REGULATOR_SWITCH_SIAMMDSPRET,
347 .ops = &db8500_regulator_switch_ops,
348 .type = REGULATOR_VOLTAGE,
349 .owner = THIS_MODULE,
350 },
351 .epod_id = EPOD_ID_SIAMMDSP,
352 .is_ramret = true,
353 },
354 [DB8500_REGULATOR_SWITCH_SIAPIPE] = {
355 .desc = {
356 .name = "db8500-sia-pipe",
357 .of_match = of_match_ptr("db8500_sia_pipe"),
358 .id = DB8500_REGULATOR_SWITCH_SIAPIPE,
359 .ops = &db8500_regulator_switch_ops,
360 .type = REGULATOR_VOLTAGE,
361 .owner = THIS_MODULE,
362 },
363 .epod_id = EPOD_ID_SIAPIPE,
364 },
365 [DB8500_REGULATOR_SWITCH_SGA] = {
366 .desc = {
367 .name = "db8500-sga",
368 .of_match = of_match_ptr("db8500_sga"),
369 .id = DB8500_REGULATOR_SWITCH_SGA,
370 .ops = &db8500_regulator_switch_ops,
371 .type = REGULATOR_VOLTAGE,
372 .owner = THIS_MODULE,
373 },
374 .epod_id = EPOD_ID_SGA,
375 },
376 [DB8500_REGULATOR_SWITCH_B2R2_MCDE] = {
377 .desc = {
378 .name = "db8500-b2r2-mcde",
379 .of_match = of_match_ptr("db8500_b2r2_mcde"),
380 .id = DB8500_REGULATOR_SWITCH_B2R2_MCDE,
381 .ops = &db8500_regulator_switch_ops,
382 .type = REGULATOR_VOLTAGE,
383 .owner = THIS_MODULE,
384 },
385 .epod_id = EPOD_ID_B2R2_MCDE,
386 },
387 [DB8500_REGULATOR_SWITCH_ESRAM12] = {
388 .desc = {
389 .name = "db8500-esram12",
390 .of_match = of_match_ptr("db8500_esram12"),
391 .id = DB8500_REGULATOR_SWITCH_ESRAM12,
392 .ops = &db8500_regulator_switch_ops,
393 .type = REGULATOR_VOLTAGE,
394 .owner = THIS_MODULE,
395 },
396 .epod_id = EPOD_ID_ESRAM12,
397 .is_enabled = true,
398 },
399 [DB8500_REGULATOR_SWITCH_ESRAM12RET] = {
400 .desc = {
401 .name = "db8500-esram12-ret",
402 .of_match = of_match_ptr("db8500_esram12_ret"),
403 .id = DB8500_REGULATOR_SWITCH_ESRAM12RET,
404 .ops = &db8500_regulator_switch_ops,
405 .type = REGULATOR_VOLTAGE,
406 .owner = THIS_MODULE,
407 },
408 .epod_id = EPOD_ID_ESRAM12,
409 .is_ramret = true,
410 },
411 [DB8500_REGULATOR_SWITCH_ESRAM34] = {
412 .desc = {
413 .name = "db8500-esram34",
414 .of_match = of_match_ptr("db8500_esram34"),
415 .id = DB8500_REGULATOR_SWITCH_ESRAM34,
416 .ops = &db8500_regulator_switch_ops,
417 .type = REGULATOR_VOLTAGE,
418 .owner = THIS_MODULE,
419 },
420 .epod_id = EPOD_ID_ESRAM34,
421 .is_enabled = true,
422 },
423 [DB8500_REGULATOR_SWITCH_ESRAM34RET] = {
424 .desc = {
425 .name = "db8500-esram34-ret",
426 .of_match = of_match_ptr("db8500_esram34_ret"),
427 .id = DB8500_REGULATOR_SWITCH_ESRAM34RET,
428 .ops = &db8500_regulator_switch_ops,
429 .type = REGULATOR_VOLTAGE,
430 .owner = THIS_MODULE,
431 },
432 .epod_id = EPOD_ID_ESRAM34,
433 .is_ramret = true,
434 },
435 };
436
db8500_regulator_probe(struct platform_device * pdev)437 static int db8500_regulator_probe(struct platform_device *pdev)
438 {
439 struct regulator_init_data *db8500_init_data;
440 struct dbx500_regulator_info *info;
441 struct regulator_config config = { };
442 struct regulator_dev *rdev;
443 int err, i;
444
445 db8500_init_data = dev_get_platdata(&pdev->dev);
446
447 for (i = 0; i < ARRAY_SIZE(dbx500_regulator_info); i++) {
448 /* assign per-regulator data */
449 info = &dbx500_regulator_info[i];
450
451 config.driver_data = info;
452 config.dev = &pdev->dev;
453 if (db8500_init_data)
454 config.init_data = &db8500_init_data[i];
455
456 rdev = devm_regulator_register(&pdev->dev, &info->desc,
457 &config);
458 if (IS_ERR(rdev)) {
459 err = PTR_ERR(rdev);
460 dev_err(&pdev->dev, "failed to register %s: err %i\n",
461 info->desc.name, err);
462 return err;
463 }
464 dev_dbg(&pdev->dev, "regulator-%s-probed\n", info->desc.name);
465 }
466
467 ux500_regulator_debug_init(pdev, dbx500_regulator_info,
468 ARRAY_SIZE(dbx500_regulator_info));
469 return 0;
470 }
471
db8500_regulator_remove(struct platform_device * pdev)472 static void db8500_regulator_remove(struct platform_device *pdev)
473 {
474 ux500_regulator_debug_exit();
475 }
476
477 static struct platform_driver db8500_regulator_driver = {
478 .driver = {
479 .name = "db8500-prcmu-regulators",
480 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
481 },
482 .probe = db8500_regulator_probe,
483 .remove_new = db8500_regulator_remove,
484 };
485
db8500_regulator_init(void)486 static int __init db8500_regulator_init(void)
487 {
488 return platform_driver_register(&db8500_regulator_driver);
489 }
490
db8500_regulator_exit(void)491 static void __exit db8500_regulator_exit(void)
492 {
493 platform_driver_unregister(&db8500_regulator_driver);
494 }
495
496 arch_initcall(db8500_regulator_init);
497 module_exit(db8500_regulator_exit);
498
499 MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
500 MODULE_DESCRIPTION("DB8500 regulator driver");
501 MODULE_LICENSE("GPL v2");
502