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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 */
45static const unsigned int da9055_current_limits[] = {
46 500000, 600000, 700000, 800000
47};
48
49struct da9055_conf_reg {
50 int reg;
51 int sel_mask;
52 int en_mask;
53};
54
55struct da9055_volt_reg {
56 int reg_a;
57 int reg_b;
58 int sl_shift;
59 int v_mask;
60};
61
62struct da9055_mode_reg {
63 int reg;
64 int mask;
65 int shift;
66};
67
68struct 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
75struct 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
82static 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
107static 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
130static 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
146static 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
168static 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
199static 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
242static 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
265static 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
278static 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
291static 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
312static 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
400static 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 */
416static 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
480err:
481 return ret;
482}
483
484static 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
494static 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
508static 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 ®ulator->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
575static 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
583static int __init da9055_regulator_init(void)
584{
585 return platform_driver_register(&da9055_regulator_driver);
586}
587subsys_initcall(da9055_regulator_init);
588
589static void __exit da9055_regulator_exit(void)
590{
591 platform_driver_unregister(&da9055_regulator_driver);
592}
593module_exit(da9055_regulator_exit);
594
595MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
596MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
597MODULE_LICENSE("GPL");
598MODULE_ALIAS("platform:da9055-regulator");