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 
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 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 
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 = false;
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 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 
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 
472 static int db8500_regulator_remove(struct platform_device *pdev)
473 {
474 	ux500_regulator_debug_exit();
475 
476 	return 0;
477 }
478 
479 static struct platform_driver db8500_regulator_driver = {
480 	.driver = {
481 		.name = "db8500-prcmu-regulators",
482 	},
483 	.probe = db8500_regulator_probe,
484 	.remove = db8500_regulator_remove,
485 };
486 
487 static int __init db8500_regulator_init(void)
488 {
489 	return platform_driver_register(&db8500_regulator_driver);
490 }
491 
492 static void __exit db8500_regulator_exit(void)
493 {
494 	platform_driver_unregister(&db8500_regulator_driver);
495 }
496 
497 arch_initcall(db8500_regulator_init);
498 module_exit(db8500_regulator_exit);
499 
500 MODULE_AUTHOR("STMicroelectronics/ST-Ericsson");
501 MODULE_DESCRIPTION("DB8500 regulator driver");
502 MODULE_LICENSE("GPL v2");
503