1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // Regulator driver for DA9055 PMIC
4 //
5 // Copyright(c) 2012 Dialog Semiconductor Ltd.
6 //
7 // Author: David Dajun Chen <dchen@diasemi.com>
8 
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/err.h>
12 #include <linux/gpio.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/platform_device.h>
15 #include <linux/regulator/driver.h>
16 #include <linux/regulator/machine.h>
17 #include <linux/of.h>
18 #include <linux/regulator/of_regulator.h>
19 
20 #include <linux/mfd/da9055/core.h>
21 #include <linux/mfd/da9055/reg.h>
22 #include <linux/mfd/da9055/pdata.h>
23 
24 #define DA9055_MIN_UA		0
25 #define DA9055_MAX_UA		3
26 
27 #define DA9055_LDO_MODE_SYNC	0
28 #define DA9055_LDO_MODE_SLEEP	1
29 
30 #define DA9055_BUCK_MODE_SLEEP	1
31 #define DA9055_BUCK_MODE_SYNC	2
32 #define DA9055_BUCK_MODE_AUTO	3
33 
34 /* DA9055 REGULATOR IDs */
35 #define DA9055_ID_BUCK1	0
36 #define DA9055_ID_BUCK2	1
37 #define DA9055_ID_LDO1		2
38 #define DA9055_ID_LDO2		3
39 #define DA9055_ID_LDO3		4
40 #define DA9055_ID_LDO4		5
41 #define DA9055_ID_LDO5		6
42 #define DA9055_ID_LDO6		7
43 
44 /* DA9055 BUCK current limit */
45 static const unsigned int da9055_current_limits[] = {
46 	500000, 600000, 700000, 800000
47 };
48 
49 struct da9055_conf_reg {
50 	int reg;
51 	int sel_mask;
52 	int en_mask;
53 };
54 
55 struct da9055_volt_reg {
56 	int reg_a;
57 	int reg_b;
58 	int sl_shift;
59 	int v_mask;
60 };
61 
62 struct da9055_mode_reg {
63 	int reg;
64 	int mask;
65 	int shift;
66 };
67 
68 struct da9055_regulator_info {
69 	struct regulator_desc reg_desc;
70 	struct da9055_conf_reg conf;
71 	struct da9055_volt_reg volt;
72 	struct da9055_mode_reg mode;
73 };
74 
75 struct da9055_regulator {
76 	struct da9055 *da9055;
77 	struct da9055_regulator_info *info;
78 	struct regulator_dev *rdev;
79 	enum gpio_select reg_rselect;
80 };
81 
82 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
83 {
84 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
85 	struct da9055_regulator_info *info = regulator->info;
86 	int ret, mode = 0;
87 
88 	ret = da9055_reg_read(regulator->da9055, info->mode.reg);
89 	if (ret < 0)
90 		return ret;
91 
92 	switch ((ret & info->mode.mask) >> info->mode.shift) {
93 	case DA9055_BUCK_MODE_SYNC:
94 		mode = REGULATOR_MODE_FAST;
95 		break;
96 	case DA9055_BUCK_MODE_AUTO:
97 		mode = REGULATOR_MODE_NORMAL;
98 		break;
99 	case DA9055_BUCK_MODE_SLEEP:
100 		mode = REGULATOR_MODE_STANDBY;
101 		break;
102 	}
103 
104 	return mode;
105 }
106 
107 static int da9055_buck_set_mode(struct regulator_dev *rdev,
108 					unsigned int mode)
109 {
110 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
111 	struct da9055_regulator_info *info = regulator->info;
112 	int val = 0;
113 
114 	switch (mode) {
115 	case REGULATOR_MODE_FAST:
116 		val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
117 		break;
118 	case REGULATOR_MODE_NORMAL:
119 		val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
120 		break;
121 	case REGULATOR_MODE_STANDBY:
122 		val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
123 		break;
124 	}
125 
126 	return da9055_reg_update(regulator->da9055, info->mode.reg,
127 				 info->mode.mask, val);
128 }
129 
130 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
131 {
132 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
133 	struct da9055_regulator_info *info = regulator->info;
134 	int ret;
135 
136 	ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
137 	if (ret < 0)
138 		return ret;
139 
140 	if (ret >> info->volt.sl_shift)
141 		return REGULATOR_MODE_STANDBY;
142 	else
143 		return REGULATOR_MODE_NORMAL;
144 }
145 
146 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
147 {
148 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
149 	struct da9055_regulator_info *info = regulator->info;
150 	struct da9055_volt_reg volt = info->volt;
151 	int val = 0;
152 
153 	switch (mode) {
154 	case REGULATOR_MODE_NORMAL:
155 	case REGULATOR_MODE_FAST:
156 		val = DA9055_LDO_MODE_SYNC;
157 		break;
158 	case REGULATOR_MODE_STANDBY:
159 		val = DA9055_LDO_MODE_SLEEP;
160 		break;
161 	}
162 
163 	return da9055_reg_update(regulator->da9055, volt.reg_b,
164 				 1 << volt.sl_shift,
165 				 val << volt.sl_shift);
166 }
167 
168 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
169 {
170 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
171 	struct da9055_regulator_info *info = regulator->info;
172 	struct da9055_volt_reg volt = info->volt;
173 	int ret, sel;
174 
175 	/*
176 	 * There are two voltage register set A & B for voltage ramping but
177 	 * either one of then can be active therefore we first determine
178 	 * the active register set.
179 	 */
180 	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
181 	if (ret < 0)
182 		return ret;
183 
184 	ret &= info->conf.sel_mask;
185 
186 	/* Get the voltage for the active register set A/B */
187 	if (ret == DA9055_REGUALTOR_SET_A)
188 		ret = da9055_reg_read(regulator->da9055, volt.reg_a);
189 	else
190 		ret = da9055_reg_read(regulator->da9055, volt.reg_b);
191 
192 	if (ret < 0)
193 		return ret;
194 
195 	sel = (ret & volt.v_mask);
196 	return sel;
197 }
198 
199 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
200 					    unsigned int selector)
201 {
202 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
203 	struct da9055_regulator_info *info = regulator->info;
204 	int ret;
205 
206 	/*
207 	 * Regulator register set A/B is not selected through GPIO therefore
208 	 * we use default register set A for voltage ramping.
209 	 */
210 	if (regulator->reg_rselect == NO_GPIO) {
211 		/* Select register set A */
212 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
213 					info->conf.sel_mask, DA9055_SEL_REG_A);
214 		if (ret < 0)
215 			return ret;
216 
217 		/* Set the voltage */
218 		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
219 					 info->volt.v_mask, selector);
220 	}
221 
222 	/*
223 	 * Here regulator register set A/B is selected through GPIO.
224 	 * Therefore we first determine the selected register set A/B and
225 	 * then set the desired voltage for that register set A/B.
226 	 */
227 	ret = da9055_reg_read(regulator->da9055, info->conf.reg);
228 	if (ret < 0)
229 		return ret;
230 
231 	ret &= info->conf.sel_mask;
232 
233 	/* Set the voltage */
234 	if (ret == DA9055_REGUALTOR_SET_A)
235 		return da9055_reg_update(regulator->da9055, info->volt.reg_a,
236 					 info->volt.v_mask, selector);
237 	else
238 		return da9055_reg_update(regulator->da9055, info->volt.reg_b,
239 					 info->volt.v_mask, selector);
240 }
241 
242 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
243 						int uV)
244 {
245 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
246 	struct da9055_regulator_info *info = regulator->info;
247 	int ret;
248 
249 	/* Select register set B for suspend voltage ramping. */
250 	if (regulator->reg_rselect == NO_GPIO) {
251 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
252 					info->conf.sel_mask, DA9055_SEL_REG_B);
253 		if (ret < 0)
254 			return ret;
255 	}
256 
257 	ret = regulator_map_voltage_linear(rdev, uV, uV);
258 	if (ret < 0)
259 		return ret;
260 
261 	return da9055_reg_update(regulator->da9055, info->volt.reg_b,
262 				 info->volt.v_mask, ret);
263 }
264 
265 static int da9055_suspend_enable(struct regulator_dev *rdev)
266 {
267 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
268 	struct da9055_regulator_info *info = regulator->info;
269 
270 	/* Select register set B for voltage ramping. */
271 	if (regulator->reg_rselect == NO_GPIO)
272 		return da9055_reg_update(regulator->da9055, info->conf.reg,
273 					info->conf.sel_mask, DA9055_SEL_REG_B);
274 	else
275 		return 0;
276 }
277 
278 static int da9055_suspend_disable(struct regulator_dev *rdev)
279 {
280 	struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
281 	struct da9055_regulator_info *info = regulator->info;
282 
283 	/* Diselect register set B. */
284 	if (regulator->reg_rselect == NO_GPIO)
285 		return da9055_reg_update(regulator->da9055, info->conf.reg,
286 					info->conf.sel_mask, DA9055_SEL_REG_A);
287 	else
288 		return 0;
289 }
290 
291 static const struct regulator_ops da9055_buck_ops = {
292 	.get_mode = da9055_buck_get_mode,
293 	.set_mode = da9055_buck_set_mode,
294 
295 	.get_current_limit = regulator_get_current_limit_regmap,
296 	.set_current_limit = regulator_set_current_limit_regmap,
297 
298 	.get_voltage_sel = da9055_regulator_get_voltage_sel,
299 	.set_voltage_sel = da9055_regulator_set_voltage_sel,
300 	.list_voltage = regulator_list_voltage_linear,
301 	.map_voltage = regulator_map_voltage_linear,
302 	.is_enabled = regulator_is_enabled_regmap,
303 	.enable = regulator_enable_regmap,
304 	.disable = regulator_disable_regmap,
305 
306 	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
307 	.set_suspend_enable = da9055_suspend_enable,
308 	.set_suspend_disable = da9055_suspend_disable,
309 	.set_suspend_mode = da9055_buck_set_mode,
310 };
311 
312 static const struct regulator_ops da9055_ldo_ops = {
313 	.get_mode = da9055_ldo_get_mode,
314 	.set_mode = da9055_ldo_set_mode,
315 
316 	.get_voltage_sel = da9055_regulator_get_voltage_sel,
317 	.set_voltage_sel = da9055_regulator_set_voltage_sel,
318 	.list_voltage = regulator_list_voltage_linear,
319 	.map_voltage = regulator_map_voltage_linear,
320 	.is_enabled = regulator_is_enabled_regmap,
321 	.enable = regulator_enable_regmap,
322 	.disable = regulator_disable_regmap,
323 
324 	.set_suspend_voltage = da9055_regulator_set_suspend_voltage,
325 	.set_suspend_enable = da9055_suspend_enable,
326 	.set_suspend_disable = da9055_suspend_disable,
327 	.set_suspend_mode = da9055_ldo_set_mode,
328 
329 };
330 
331 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
332 {\
333 	.reg_desc = {\
334 		.name = #_id,\
335 		.of_match = of_match_ptr(#_id),\
336 		.regulators_node = of_match_ptr("regulators"),\
337 		.ops = &da9055_ldo_ops,\
338 		.type = REGULATOR_VOLTAGE,\
339 		.id = DA9055_ID_##_id,\
340 		.n_voltages = (max - min) / step + 1 + (voffset), \
341 		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
342 		.enable_mask = 1, \
343 		.min_uV = (min) * 1000,\
344 		.uV_step = (step) * 1000,\
345 		.linear_min_sel = (voffset),\
346 		.owner = THIS_MODULE,\
347 	},\
348 	.conf = {\
349 		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
350 		.sel_mask = (1 << 4),\
351 		.en_mask = 1,\
352 	},\
353 	.volt = {\
354 		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
355 		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
356 		.sl_shift = 7,\
357 		.v_mask = (1 << (vbits)) - 1,\
358 	},\
359 }
360 
361 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
362 {\
363 	.reg_desc = {\
364 		.name = #_id,\
365 		.of_match = of_match_ptr(#_id),\
366 		.regulators_node = of_match_ptr("regulators"),\
367 		.ops = &da9055_buck_ops,\
368 		.type = REGULATOR_VOLTAGE,\
369 		.id = DA9055_ID_##_id,\
370 		.n_voltages = (max - min) / step + 1 + (voffset), \
371 		.enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
372 		.enable_mask = 1,\
373 		.min_uV = (min) * 1000,\
374 		.uV_step = (step) * 1000,\
375 		.linear_min_sel = (voffset),\
376 		.owner = THIS_MODULE,\
377 		.curr_table = da9055_current_limits,\
378 		.n_current_limits = ARRAY_SIZE(da9055_current_limits),\
379 		.csel_reg = DA9055_REG_BUCK_LIM,\
380 		.csel_mask = (mbits),\
381 	},\
382 	.conf = {\
383 		.reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
384 		.sel_mask = (1 << 4),\
385 		.en_mask = 1,\
386 	},\
387 	.volt = {\
388 		.reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
389 		.reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
390 		.sl_shift = 7,\
391 		.v_mask = (1 << (vbits)) - 1,\
392 	},\
393 	.mode = {\
394 		.reg = DA9055_REG_BCORE_MODE,\
395 		.mask = (mbits),\
396 		.shift = (sbits),\
397 	},\
398 }
399 
400 static struct da9055_regulator_info da9055_regulator_info[] = {
401 	DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
402 	DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
403 	DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
404 	DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
405 	DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
406 	DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
407 	DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
408 	DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
409 };
410 
411 /*
412  * Configures regulator to be controlled either through GPIO 1 or 2.
413  * GPIO can control regulator state and/or select the regulator register
414  * set A/B for voltage ramping.
415  */
416 static int da9055_gpio_init(struct da9055_regulator *regulator,
417 			    struct regulator_config *config,
418 			    struct da9055_pdata *pdata, int id)
419 {
420 	struct da9055_regulator_info *info = regulator->info;
421 	int ret = 0;
422 
423 	if (!pdata)
424 		return 0;
425 
426 	if (pdata->gpio_ren && pdata->gpio_ren[id]) {
427 		char name[18];
428 		int gpio_mux = pdata->gpio_ren[id];
429 
430 		config->ena_gpiod = pdata->ena_gpiods[id];
431 
432 		/*
433 		 * GPI pin is muxed with regulator to control the
434 		 * regulator state.
435 		 */
436 		sprintf(name, "DA9055 GPI %d", gpio_mux);
437 		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
438 					    name);
439 		if (ret < 0)
440 			goto err;
441 
442 		/*
443 		 * Let the regulator know that its state is controlled
444 		 * through GPI.
445 		 */
446 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
447 					DA9055_E_GPI_MASK,
448 					pdata->reg_ren[id]
449 					<< DA9055_E_GPI_SHIFT);
450 		if (ret < 0)
451 			goto err;
452 	}
453 
454 	if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
455 		char name[18];
456 		int gpio_mux = pdata->gpio_rsel[id];
457 
458 		regulator->reg_rselect = pdata->reg_rsel[id];
459 
460 		/*
461 		 * GPI pin is muxed with regulator to select the
462 		 * regulator register set A/B for voltage ramping.
463 		 */
464 		sprintf(name, "DA9055 GPI %d", gpio_mux);
465 		ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
466 					    name);
467 		if (ret < 0)
468 			goto err;
469 
470 		/*
471 		 * Let the regulator know that its register set A/B
472 		 * will be selected through GPI for voltage ramping.
473 		 */
474 		ret = da9055_reg_update(regulator->da9055, info->conf.reg,
475 					DA9055_V_GPI_MASK,
476 					pdata->reg_rsel[id]
477 					<< DA9055_V_GPI_SHIFT);
478 	}
479 
480 err:
481 	return ret;
482 }
483 
484 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
485 {
486 	struct da9055_regulator *regulator = data;
487 
488 	regulator_notifier_call_chain(regulator->rdev,
489 				      REGULATOR_EVENT_OVER_CURRENT, NULL);
490 
491 	return IRQ_HANDLED;
492 }
493 
494 static inline struct da9055_regulator_info *find_regulator_info(int id)
495 {
496 	struct da9055_regulator_info *info;
497 	int i;
498 
499 	for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
500 		info = &da9055_regulator_info[i];
501 		if (info->reg_desc.id == id)
502 			return info;
503 	}
504 
505 	return NULL;
506 }
507 
508 static int da9055_regulator_probe(struct platform_device *pdev)
509 {
510 	struct regulator_config config = { };
511 	struct da9055_regulator *regulator;
512 	struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
513 	struct da9055_pdata *pdata = dev_get_platdata(da9055->dev);
514 	int ret, irq;
515 
516 	regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
517 				 GFP_KERNEL);
518 	if (!regulator)
519 		return -ENOMEM;
520 
521 	regulator->info = find_regulator_info(pdev->id);
522 	if (regulator->info == NULL) {
523 		dev_err(&pdev->dev, "invalid regulator ID specified\n");
524 		return -EINVAL;
525 	}
526 
527 	regulator->da9055 = da9055;
528 	config.dev = da9055->dev;
529 	config.driver_data = regulator;
530 	config.regmap = da9055->regmap;
531 
532 	if (pdata)
533 		config.init_data = pdata->regulators[pdev->id];
534 
535 	ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
536 	if (ret < 0)
537 		return ret;
538 
539 	regulator->rdev = devm_regulator_register(&pdev->dev,
540 						  &regulator->info->reg_desc,
541 						  &config);
542 	if (IS_ERR(regulator->rdev)) {
543 		dev_err(&pdev->dev, "Failed to register regulator %s\n",
544 			regulator->info->reg_desc.name);
545 		return PTR_ERR(regulator->rdev);
546 	}
547 
548 	/* Only LDO 5 and 6 has got the over current interrupt */
549 	if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
550 		irq = platform_get_irq_byname(pdev, "REGULATOR");
551 		if (irq < 0)
552 			return irq;
553 
554 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
555 						da9055_ldo5_6_oc_irq,
556 						IRQF_TRIGGER_HIGH |
557 						IRQF_ONESHOT |
558 						IRQF_PROBE_SHARED,
559 						pdev->name, regulator);
560 		if (ret != 0) {
561 			if (ret != -EBUSY) {
562 				dev_err(&pdev->dev,
563 				"Failed to request Regulator IRQ %d: %d\n",
564 				irq, ret);
565 				return ret;
566 			}
567 		}
568 	}
569 
570 	platform_set_drvdata(pdev, regulator);
571 
572 	return 0;
573 }
574 
575 static struct platform_driver da9055_regulator_driver = {
576 	.probe = da9055_regulator_probe,
577 	.driver = {
578 		.name = "da9055-regulator",
579 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
580 	},
581 };
582 
583 static int __init da9055_regulator_init(void)
584 {
585 	return platform_driver_register(&da9055_regulator_driver);
586 }
587 subsys_initcall(da9055_regulator_init);
588 
589 static void __exit da9055_regulator_exit(void)
590 {
591 	platform_driver_unregister(&da9055_regulator_driver);
592 }
593 module_exit(da9055_regulator_exit);
594 
595 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
596 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
597 MODULE_LICENSE("GPL");
598 MODULE_ALIAS("platform:da9055-regulator");
599