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1// SPDX-License-Identifier: GPL-2.0+
2//
3// wm831x-dcdc.c -- DC-DC buck converter driver for the WM831x series
4//
5// Copyright 2009 Wolfson Microelectronics PLC.
6//
7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9#include <linux/module.h>
10#include <linux/moduleparam.h>
11#include <linux/init.h>
12#include <linux/bitops.h>
13#include <linux/err.h>
14#include <linux/i2c.h>
15#include <linux/platform_device.h>
16#include <linux/regulator/driver.h>
17#include <linux/regulator/machine.h>
18#include <linux/gpio/consumer.h>
19#include <linux/slab.h>
20
21#include <linux/mfd/wm831x/core.h>
22#include <linux/mfd/wm831x/regulator.h>
23#include <linux/mfd/wm831x/pdata.h>
24
25#define WM831X_BUCKV_MAX_SELECTOR 0x68
26#define WM831X_BUCKP_MAX_SELECTOR 0x66
27
28#define WM831X_DCDC_MODE_FAST 0
29#define WM831X_DCDC_MODE_NORMAL 1
30#define WM831X_DCDC_MODE_IDLE 2
31#define WM831X_DCDC_MODE_STANDBY 3
32
33#define WM831X_DCDC_MAX_NAME 9
34
35/* Register offsets in control block */
36#define WM831X_DCDC_CONTROL_1 0
37#define WM831X_DCDC_CONTROL_2 1
38#define WM831X_DCDC_ON_CONFIG 2
39#define WM831X_DCDC_SLEEP_CONTROL 3
40#define WM831X_DCDC_DVS_CONTROL 4
41
42/*
43 * Shared
44 */
45
46struct wm831x_dcdc {
47 char name[WM831X_DCDC_MAX_NAME];
48 char supply_name[WM831X_DCDC_MAX_NAME];
49 struct regulator_desc desc;
50 int base;
51 struct wm831x *wm831x;
52 struct regulator_dev *regulator;
53 struct gpio_desc *dvs_gpiod;
54 int dvs_gpio_state;
55 int on_vsel;
56 int dvs_vsel;
57};
58
59static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
60
61{
62 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
63 struct wm831x *wm831x = dcdc->wm831x;
64 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
65 int val;
66
67 val = wm831x_reg_read(wm831x, reg);
68 if (val < 0)
69 return val;
70
71 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
72
73 switch (val) {
74 case WM831X_DCDC_MODE_FAST:
75 return REGULATOR_MODE_FAST;
76 case WM831X_DCDC_MODE_NORMAL:
77 return REGULATOR_MODE_NORMAL;
78 case WM831X_DCDC_MODE_STANDBY:
79 return REGULATOR_MODE_STANDBY;
80 case WM831X_DCDC_MODE_IDLE:
81 return REGULATOR_MODE_IDLE;
82 default:
83 BUG();
84 return -EINVAL;
85 }
86}
87
88static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
89 unsigned int mode)
90{
91 int val;
92
93 switch (mode) {
94 case REGULATOR_MODE_FAST:
95 val = WM831X_DCDC_MODE_FAST;
96 break;
97 case REGULATOR_MODE_NORMAL:
98 val = WM831X_DCDC_MODE_NORMAL;
99 break;
100 case REGULATOR_MODE_STANDBY:
101 val = WM831X_DCDC_MODE_STANDBY;
102 break;
103 case REGULATOR_MODE_IDLE:
104 val = WM831X_DCDC_MODE_IDLE;
105 break;
106 default:
107 return -EINVAL;
108 }
109
110 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
111 val << WM831X_DC1_ON_MODE_SHIFT);
112}
113
114static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
115{
116 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
117 struct wm831x *wm831x = dcdc->wm831x;
118 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
119
120 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
121}
122
123static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
124 unsigned int mode)
125{
126 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
127 struct wm831x *wm831x = dcdc->wm831x;
128 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
129
130 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
131}
132
133static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
134{
135 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
136 struct wm831x *wm831x = dcdc->wm831x;
137 int ret;
138
139 /* First, check for errors */
140 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
141 if (ret < 0)
142 return ret;
143
144 if (ret & (1 << rdev_get_id(rdev))) {
145 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
146 rdev_get_id(rdev) + 1);
147 return REGULATOR_STATUS_ERROR;
148 }
149
150 /* DCDC1 and DCDC2 can additionally detect high voltage/current */
151 if (rdev_get_id(rdev) < 2) {
152 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
153 dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
154 rdev_get_id(rdev) + 1);
155 return REGULATOR_STATUS_ERROR;
156 }
157
158 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
159 dev_dbg(wm831x->dev, "DCDC%d over current\n",
160 rdev_get_id(rdev) + 1);
161 return REGULATOR_STATUS_ERROR;
162 }
163 }
164
165 /* Is the regulator on? */
166 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
167 if (ret < 0)
168 return ret;
169 if (!(ret & (1 << rdev_get_id(rdev))))
170 return REGULATOR_STATUS_OFF;
171
172 /* TODO: When we handle hardware control modes so we can report the
173 * current mode. */
174 return REGULATOR_STATUS_ON;
175}
176
177static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
178{
179 struct wm831x_dcdc *dcdc = data;
180
181 regulator_notifier_call_chain(dcdc->regulator,
182 REGULATOR_EVENT_UNDER_VOLTAGE,
183 NULL);
184
185 return IRQ_HANDLED;
186}
187
188static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
189{
190 struct wm831x_dcdc *dcdc = data;
191
192 regulator_notifier_call_chain(dcdc->regulator,
193 REGULATOR_EVENT_OVER_CURRENT,
194 NULL);
195
196 return IRQ_HANDLED;
197}
198
199/*
200 * BUCKV specifics
201 */
202
203static const struct linear_range wm831x_buckv_ranges[] = {
204 REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0),
205 REGULATOR_LINEAR_RANGE(600000, 0x8, 0x68, 12500),
206};
207
208static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
209{
210 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
211
212 if (state == dcdc->dvs_gpio_state)
213 return 0;
214
215 dcdc->dvs_gpio_state = state;
216 gpiod_set_value(dcdc->dvs_gpiod, state);
217
218 /* Should wait for DVS state change to be asserted if we have
219 * a GPIO for it, for now assume the device is configured
220 * for the fastest possible transition.
221 */
222
223 return 0;
224}
225
226static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
227 unsigned vsel)
228{
229 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
230 struct wm831x *wm831x = dcdc->wm831x;
231 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
232 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
233 int ret;
234
235 /* If this value is already set then do a GPIO update if we can */
236 if (dcdc->dvs_gpiod && dcdc->on_vsel == vsel)
237 return wm831x_buckv_set_dvs(rdev, 0);
238
239 if (dcdc->dvs_gpiod && dcdc->dvs_vsel == vsel)
240 return wm831x_buckv_set_dvs(rdev, 1);
241
242 /* Always set the ON status to the minimum voltage */
243 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
244 if (ret < 0)
245 return ret;
246 dcdc->on_vsel = vsel;
247
248 if (!dcdc->dvs_gpiod)
249 return ret;
250
251 /* Kick the voltage transition now */
252 ret = wm831x_buckv_set_dvs(rdev, 0);
253 if (ret < 0)
254 return ret;
255
256 /*
257 * If this VSEL is higher than the last one we've seen then
258 * remember it as the DVS VSEL. This is optimised for CPUfreq
259 * usage where we want to get to the highest voltage very
260 * quickly.
261 */
262 if (vsel > dcdc->dvs_vsel) {
263 ret = wm831x_set_bits(wm831x, dvs_reg,
264 WM831X_DC1_DVS_VSEL_MASK,
265 vsel);
266 if (ret == 0)
267 dcdc->dvs_vsel = vsel;
268 else
269 dev_warn(wm831x->dev,
270 "Failed to set DCDC DVS VSEL: %d\n", ret);
271 }
272
273 return 0;
274}
275
276static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
277 int uV)
278{
279 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
280 struct wm831x *wm831x = dcdc->wm831x;
281 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
282 int vsel;
283
284 vsel = regulator_map_voltage_linear_range(rdev, uV, uV);
285 if (vsel < 0)
286 return vsel;
287
288 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
289}
290
291static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
292{
293 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
294
295 if (dcdc->dvs_gpiod && dcdc->dvs_gpio_state)
296 return dcdc->dvs_vsel;
297 else
298 return dcdc->on_vsel;
299}
300
301/* Current limit options */
302static const unsigned int wm831x_dcdc_ilim[] = {
303 125000, 250000, 375000, 500000, 625000, 750000, 875000, 1000000
304};
305
306static const struct regulator_ops wm831x_buckv_ops = {
307 .set_voltage_sel = wm831x_buckv_set_voltage_sel,
308 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
309 .list_voltage = regulator_list_voltage_linear_range,
310 .map_voltage = regulator_map_voltage_linear_range,
311 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
312 .set_current_limit = regulator_set_current_limit_regmap,
313 .get_current_limit = regulator_get_current_limit_regmap,
314
315 .is_enabled = regulator_is_enabled_regmap,
316 .enable = regulator_enable_regmap,
317 .disable = regulator_disable_regmap,
318 .get_status = wm831x_dcdc_get_status,
319 .get_mode = wm831x_dcdc_get_mode,
320 .set_mode = wm831x_dcdc_set_mode,
321 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
322};
323
324/*
325 * Set up DVS control. We just log errors since we can still run
326 * (with reduced performance) if we fail.
327 */
328static void wm831x_buckv_dvs_init(struct platform_device *pdev,
329 struct wm831x_dcdc *dcdc,
330 struct wm831x_buckv_pdata *pdata)
331{
332 struct wm831x *wm831x = dcdc->wm831x;
333 int ret;
334 u16 ctrl;
335
336 if (!pdata)
337 return;
338
339 /* gpiolib won't let us read the GPIO status so pick the higher
340 * of the two existing voltages so we take it as platform data.
341 */
342 dcdc->dvs_gpio_state = pdata->dvs_init_state;
343
344 dcdc->dvs_gpiod = devm_gpiod_get(&pdev->dev, "dvs",
345 dcdc->dvs_gpio_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
346 if (IS_ERR(dcdc->dvs_gpiod)) {
347 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %ld\n",
348 dcdc->name, PTR_ERR(dcdc->dvs_gpiod));
349 return;
350 }
351
352 switch (pdata->dvs_control_src) {
353 case 1:
354 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
355 break;
356 case 2:
357 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
358 break;
359 default:
360 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
361 pdata->dvs_control_src, dcdc->name);
362 return;
363 }
364
365 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
366 * to make bootstrapping a bit smoother.
367 */
368 if (!dcdc->dvs_vsel) {
369 ret = wm831x_set_bits(wm831x,
370 dcdc->base + WM831X_DCDC_DVS_CONTROL,
371 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
372 if (ret == 0)
373 dcdc->dvs_vsel = dcdc->on_vsel;
374 else
375 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
376 ret);
377 }
378
379 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
380 WM831X_DC1_DVS_SRC_MASK, ctrl);
381 if (ret < 0) {
382 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
383 dcdc->name, ret);
384 }
385}
386
387static int wm831x_buckv_probe(struct platform_device *pdev)
388{
389 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
390 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
391 struct regulator_config config = { };
392 int id;
393 struct wm831x_dcdc *dcdc;
394 struct resource *res;
395 int ret, irq;
396
397 if (pdata && pdata->wm831x_num)
398 id = (pdata->wm831x_num * 10) + 1;
399 else
400 id = 0;
401 id = pdev->id - id;
402
403 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
404
405 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
406 GFP_KERNEL);
407 if (!dcdc)
408 return -ENOMEM;
409
410 dcdc->wm831x = wm831x;
411
412 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
413 if (res == NULL) {
414 dev_err(&pdev->dev, "No REG resource\n");
415 ret = -EINVAL;
416 goto err;
417 }
418 dcdc->base = res->start;
419
420 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
421 dcdc->desc.name = dcdc->name;
422
423 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
424 "DC%dVDD", id + 1);
425 dcdc->desc.supply_name = dcdc->supply_name;
426
427 dcdc->desc.id = id;
428 dcdc->desc.type = REGULATOR_VOLTAGE;
429 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
430 dcdc->desc.linear_ranges = wm831x_buckv_ranges;
431 dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges);
432 dcdc->desc.ops = &wm831x_buckv_ops;
433 dcdc->desc.owner = THIS_MODULE;
434 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
435 dcdc->desc.enable_mask = 1 << id;
436 dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2;
437 dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK;
438 dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim);
439 dcdc->desc.curr_table = wm831x_dcdc_ilim;
440
441 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
442 if (ret < 0) {
443 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
444 goto err;
445 }
446 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
447
448 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
449 if (ret < 0) {
450 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
451 goto err;
452 }
453 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
454
455 if (pdata && pdata->dcdc[id])
456 wm831x_buckv_dvs_init(pdev, dcdc,
457 pdata->dcdc[id]->driver_data);
458
459 config.dev = pdev->dev.parent;
460 if (pdata)
461 config.init_data = pdata->dcdc[id];
462 config.driver_data = dcdc;
463 config.regmap = wm831x->regmap;
464
465 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
466 &config);
467 if (IS_ERR(dcdc->regulator)) {
468 ret = PTR_ERR(dcdc->regulator);
469 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
470 id + 1, ret);
471 goto err;
472 }
473
474 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
475 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
476 wm831x_dcdc_uv_irq,
477 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
478 dcdc->name, dcdc);
479 if (ret != 0) {
480 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
481 irq, ret);
482 goto err;
483 }
484
485 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
486 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
487 wm831x_dcdc_oc_irq,
488 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
489 dcdc->name, dcdc);
490 if (ret != 0) {
491 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
492 irq, ret);
493 goto err;
494 }
495
496 platform_set_drvdata(pdev, dcdc);
497
498 return 0;
499
500err:
501 return ret;
502}
503
504static struct platform_driver wm831x_buckv_driver = {
505 .probe = wm831x_buckv_probe,
506 .driver = {
507 .name = "wm831x-buckv",
508 },
509};
510
511/*
512 * BUCKP specifics
513 */
514
515static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
516{
517 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
518 struct wm831x *wm831x = dcdc->wm831x;
519 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
520 int sel;
521
522 sel = regulator_map_voltage_linear(rdev, uV, uV);
523 if (sel < 0)
524 return sel;
525
526 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
527}
528
529static const struct regulator_ops wm831x_buckp_ops = {
530 .set_voltage_sel = regulator_set_voltage_sel_regmap,
531 .get_voltage_sel = regulator_get_voltage_sel_regmap,
532 .list_voltage = regulator_list_voltage_linear,
533 .map_voltage = regulator_map_voltage_linear,
534 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
535
536 .is_enabled = regulator_is_enabled_regmap,
537 .enable = regulator_enable_regmap,
538 .disable = regulator_disable_regmap,
539 .get_status = wm831x_dcdc_get_status,
540 .get_mode = wm831x_dcdc_get_mode,
541 .set_mode = wm831x_dcdc_set_mode,
542 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
543};
544
545static int wm831x_buckp_probe(struct platform_device *pdev)
546{
547 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
548 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
549 struct regulator_config config = { };
550 int id;
551 struct wm831x_dcdc *dcdc;
552 struct resource *res;
553 int ret, irq;
554
555 if (pdata && pdata->wm831x_num)
556 id = (pdata->wm831x_num * 10) + 1;
557 else
558 id = 0;
559 id = pdev->id - id;
560
561 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
562
563 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
564 GFP_KERNEL);
565 if (!dcdc)
566 return -ENOMEM;
567
568 dcdc->wm831x = wm831x;
569
570 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
571 if (res == NULL) {
572 dev_err(&pdev->dev, "No REG resource\n");
573 ret = -EINVAL;
574 goto err;
575 }
576 dcdc->base = res->start;
577
578 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
579 dcdc->desc.name = dcdc->name;
580
581 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
582 "DC%dVDD", id + 1);
583 dcdc->desc.supply_name = dcdc->supply_name;
584
585 dcdc->desc.id = id;
586 dcdc->desc.type = REGULATOR_VOLTAGE;
587 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
588 dcdc->desc.ops = &wm831x_buckp_ops;
589 dcdc->desc.owner = THIS_MODULE;
590 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
591 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
592 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
593 dcdc->desc.enable_mask = 1 << id;
594 dcdc->desc.min_uV = 850000;
595 dcdc->desc.uV_step = 25000;
596
597 config.dev = pdev->dev.parent;
598 if (pdata)
599 config.init_data = pdata->dcdc[id];
600 config.driver_data = dcdc;
601 config.regmap = wm831x->regmap;
602
603 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
604 &config);
605 if (IS_ERR(dcdc->regulator)) {
606 ret = PTR_ERR(dcdc->regulator);
607 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
608 id + 1, ret);
609 goto err;
610 }
611
612 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
613 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
614 wm831x_dcdc_uv_irq,
615 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
616 dcdc->name, dcdc);
617 if (ret != 0) {
618 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
619 irq, ret);
620 goto err;
621 }
622
623 platform_set_drvdata(pdev, dcdc);
624
625 return 0;
626
627err:
628 return ret;
629}
630
631static struct platform_driver wm831x_buckp_driver = {
632 .probe = wm831x_buckp_probe,
633 .driver = {
634 .name = "wm831x-buckp",
635 },
636};
637
638/*
639 * DCDC boost convertors
640 */
641
642static int wm831x_boostp_get_status(struct regulator_dev *rdev)
643{
644 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
645 struct wm831x *wm831x = dcdc->wm831x;
646 int ret;
647
648 /* First, check for errors */
649 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
650 if (ret < 0)
651 return ret;
652
653 if (ret & (1 << rdev_get_id(rdev))) {
654 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
655 rdev_get_id(rdev) + 1);
656 return REGULATOR_STATUS_ERROR;
657 }
658
659 /* Is the regulator on? */
660 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
661 if (ret < 0)
662 return ret;
663 if (ret & (1 << rdev_get_id(rdev)))
664 return REGULATOR_STATUS_ON;
665 else
666 return REGULATOR_STATUS_OFF;
667}
668
669static const struct regulator_ops wm831x_boostp_ops = {
670 .get_status = wm831x_boostp_get_status,
671
672 .is_enabled = regulator_is_enabled_regmap,
673 .enable = regulator_enable_regmap,
674 .disable = regulator_disable_regmap,
675};
676
677static int wm831x_boostp_probe(struct platform_device *pdev)
678{
679 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
680 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
681 struct regulator_config config = { };
682 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
683 struct wm831x_dcdc *dcdc;
684 struct resource *res;
685 int ret, irq;
686
687 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
688
689 if (pdata == NULL || pdata->dcdc[id] == NULL)
690 return -ENODEV;
691
692 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
693 if (!dcdc)
694 return -ENOMEM;
695
696 dcdc->wm831x = wm831x;
697
698 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
699 if (res == NULL) {
700 dev_err(&pdev->dev, "No REG resource\n");
701 return -EINVAL;
702 }
703 dcdc->base = res->start;
704
705 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
706 dcdc->desc.name = dcdc->name;
707 dcdc->desc.id = id;
708 dcdc->desc.type = REGULATOR_VOLTAGE;
709 dcdc->desc.ops = &wm831x_boostp_ops;
710 dcdc->desc.owner = THIS_MODULE;
711 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
712 dcdc->desc.enable_mask = 1 << id;
713
714 config.dev = pdev->dev.parent;
715 if (pdata)
716 config.init_data = pdata->dcdc[id];
717 config.driver_data = dcdc;
718 config.regmap = wm831x->regmap;
719
720 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
721 &config);
722 if (IS_ERR(dcdc->regulator)) {
723 ret = PTR_ERR(dcdc->regulator);
724 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
725 id + 1, ret);
726 return ret;
727 }
728
729 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
730 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
731 wm831x_dcdc_uv_irq,
732 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
733 dcdc->name,
734 dcdc);
735 if (ret != 0) {
736 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
737 irq, ret);
738 return ret;
739 }
740
741 platform_set_drvdata(pdev, dcdc);
742
743 return 0;
744}
745
746static struct platform_driver wm831x_boostp_driver = {
747 .probe = wm831x_boostp_probe,
748 .driver = {
749 .name = "wm831x-boostp",
750 },
751};
752
753/*
754 * External Power Enable
755 *
756 * These aren't actually DCDCs but look like them in hardware so share
757 * code.
758 */
759
760#define WM831X_EPE_BASE 6
761
762static const struct regulator_ops wm831x_epe_ops = {
763 .is_enabled = regulator_is_enabled_regmap,
764 .enable = regulator_enable_regmap,
765 .disable = regulator_disable_regmap,
766 .get_status = wm831x_dcdc_get_status,
767};
768
769static int wm831x_epe_probe(struct platform_device *pdev)
770{
771 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
772 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
773 struct regulator_config config = { };
774 int id = pdev->id % ARRAY_SIZE(pdata->epe);
775 struct wm831x_dcdc *dcdc;
776 int ret;
777
778 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
779
780 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
781 if (!dcdc)
782 return -ENOMEM;
783
784 dcdc->wm831x = wm831x;
785
786 /* For current parts this is correct; probably need to revisit
787 * in future.
788 */
789 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
790 dcdc->desc.name = dcdc->name;
791 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
792 dcdc->desc.ops = &wm831x_epe_ops;
793 dcdc->desc.type = REGULATOR_VOLTAGE;
794 dcdc->desc.owner = THIS_MODULE;
795 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
796 dcdc->desc.enable_mask = 1 << dcdc->desc.id;
797
798 config.dev = pdev->dev.parent;
799 if (pdata)
800 config.init_data = pdata->epe[id];
801 config.driver_data = dcdc;
802 config.regmap = wm831x->regmap;
803
804 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
805 &config);
806 if (IS_ERR(dcdc->regulator)) {
807 ret = PTR_ERR(dcdc->regulator);
808 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
809 id + 1, ret);
810 goto err;
811 }
812
813 platform_set_drvdata(pdev, dcdc);
814
815 return 0;
816
817err:
818 return ret;
819}
820
821static struct platform_driver wm831x_epe_driver = {
822 .probe = wm831x_epe_probe,
823 .driver = {
824 .name = "wm831x-epe",
825 },
826};
827
828static struct platform_driver * const drivers[] = {
829 &wm831x_buckv_driver,
830 &wm831x_buckp_driver,
831 &wm831x_boostp_driver,
832 &wm831x_epe_driver,
833};
834
835static int __init wm831x_dcdc_init(void)
836{
837 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
838}
839subsys_initcall(wm831x_dcdc_init);
840
841static void __exit wm831x_dcdc_exit(void)
842{
843 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
844}
845module_exit(wm831x_dcdc_exit);
846
847/* Module information */
848MODULE_AUTHOR("Mark Brown");
849MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
850MODULE_LICENSE("GPL");
851MODULE_ALIAS("platform:wm831x-buckv");
852MODULE_ALIAS("platform:wm831x-buckp");
853MODULE_ALIAS("platform:wm831x-boostp");
854MODULE_ALIAS("platform:wm831x-epe");
1/*
2 * wm831x-dcdc.c -- DC-DC buck convertor driver for the WM831x series
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/init.h>
17#include <linux/bitops.h>
18#include <linux/err.h>
19#include <linux/i2c.h>
20#include <linux/platform_device.h>
21#include <linux/regulator/driver.h>
22#include <linux/regulator/machine.h>
23#include <linux/gpio.h>
24#include <linux/slab.h>
25
26#include <linux/mfd/wm831x/core.h>
27#include <linux/mfd/wm831x/regulator.h>
28#include <linux/mfd/wm831x/pdata.h>
29
30#define WM831X_BUCKV_MAX_SELECTOR 0x68
31#define WM831X_BUCKP_MAX_SELECTOR 0x66
32
33#define WM831X_DCDC_MODE_FAST 0
34#define WM831X_DCDC_MODE_NORMAL 1
35#define WM831X_DCDC_MODE_IDLE 2
36#define WM831X_DCDC_MODE_STANDBY 3
37
38#define WM831X_DCDC_MAX_NAME 9
39
40/* Register offsets in control block */
41#define WM831X_DCDC_CONTROL_1 0
42#define WM831X_DCDC_CONTROL_2 1
43#define WM831X_DCDC_ON_CONFIG 2
44#define WM831X_DCDC_SLEEP_CONTROL 3
45#define WM831X_DCDC_DVS_CONTROL 4
46
47/*
48 * Shared
49 */
50
51struct wm831x_dcdc {
52 char name[WM831X_DCDC_MAX_NAME];
53 char supply_name[WM831X_DCDC_MAX_NAME];
54 struct regulator_desc desc;
55 int base;
56 struct wm831x *wm831x;
57 struct regulator_dev *regulator;
58 int dvs_gpio;
59 int dvs_gpio_state;
60 int on_vsel;
61 int dvs_vsel;
62};
63
64static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
65
66{
67 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
68 struct wm831x *wm831x = dcdc->wm831x;
69 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
70 int val;
71
72 val = wm831x_reg_read(wm831x, reg);
73 if (val < 0)
74 return val;
75
76 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
77
78 switch (val) {
79 case WM831X_DCDC_MODE_FAST:
80 return REGULATOR_MODE_FAST;
81 case WM831X_DCDC_MODE_NORMAL:
82 return REGULATOR_MODE_NORMAL;
83 case WM831X_DCDC_MODE_STANDBY:
84 return REGULATOR_MODE_STANDBY;
85 case WM831X_DCDC_MODE_IDLE:
86 return REGULATOR_MODE_IDLE;
87 default:
88 BUG();
89 return -EINVAL;
90 }
91}
92
93static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
94 unsigned int mode)
95{
96 int val;
97
98 switch (mode) {
99 case REGULATOR_MODE_FAST:
100 val = WM831X_DCDC_MODE_FAST;
101 break;
102 case REGULATOR_MODE_NORMAL:
103 val = WM831X_DCDC_MODE_NORMAL;
104 break;
105 case REGULATOR_MODE_STANDBY:
106 val = WM831X_DCDC_MODE_STANDBY;
107 break;
108 case REGULATOR_MODE_IDLE:
109 val = WM831X_DCDC_MODE_IDLE;
110 break;
111 default:
112 return -EINVAL;
113 }
114
115 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
116 val << WM831X_DC1_ON_MODE_SHIFT);
117}
118
119static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
120{
121 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
122 struct wm831x *wm831x = dcdc->wm831x;
123 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
124
125 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
126}
127
128static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
129 unsigned int mode)
130{
131 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
132 struct wm831x *wm831x = dcdc->wm831x;
133 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
134
135 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
136}
137
138static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
139{
140 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
141 struct wm831x *wm831x = dcdc->wm831x;
142 int ret;
143
144 /* First, check for errors */
145 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
146 if (ret < 0)
147 return ret;
148
149 if (ret & (1 << rdev_get_id(rdev))) {
150 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
151 rdev_get_id(rdev) + 1);
152 return REGULATOR_STATUS_ERROR;
153 }
154
155 /* DCDC1 and DCDC2 can additionally detect high voltage/current */
156 if (rdev_get_id(rdev) < 2) {
157 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
158 dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
159 rdev_get_id(rdev) + 1);
160 return REGULATOR_STATUS_ERROR;
161 }
162
163 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
164 dev_dbg(wm831x->dev, "DCDC%d over current\n",
165 rdev_get_id(rdev) + 1);
166 return REGULATOR_STATUS_ERROR;
167 }
168 }
169
170 /* Is the regulator on? */
171 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
172 if (ret < 0)
173 return ret;
174 if (!(ret & (1 << rdev_get_id(rdev))))
175 return REGULATOR_STATUS_OFF;
176
177 /* TODO: When we handle hardware control modes so we can report the
178 * current mode. */
179 return REGULATOR_STATUS_ON;
180}
181
182static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
183{
184 struct wm831x_dcdc *dcdc = data;
185
186 regulator_notifier_call_chain(dcdc->regulator,
187 REGULATOR_EVENT_UNDER_VOLTAGE,
188 NULL);
189
190 return IRQ_HANDLED;
191}
192
193static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
194{
195 struct wm831x_dcdc *dcdc = data;
196
197 regulator_notifier_call_chain(dcdc->regulator,
198 REGULATOR_EVENT_OVER_CURRENT,
199 NULL);
200
201 return IRQ_HANDLED;
202}
203
204/*
205 * BUCKV specifics
206 */
207
208static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
209 unsigned selector)
210{
211 if (selector <= 0x8)
212 return 600000;
213 if (selector <= WM831X_BUCKV_MAX_SELECTOR)
214 return 600000 + ((selector - 0x8) * 12500);
215 return -EINVAL;
216}
217
218static int wm831x_buckv_map_voltage(struct regulator_dev *rdev,
219 int min_uV, int max_uV)
220{
221 u16 vsel;
222
223 if (min_uV < 600000)
224 vsel = 0;
225 else if (min_uV <= 1800000)
226 vsel = DIV_ROUND_UP(min_uV - 600000, 12500) + 8;
227 else
228 return -EINVAL;
229
230 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
231 return -EINVAL;
232
233 return vsel;
234}
235
236static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
237{
238 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
239
240 if (state == dcdc->dvs_gpio_state)
241 return 0;
242
243 dcdc->dvs_gpio_state = state;
244 gpio_set_value(dcdc->dvs_gpio, state);
245
246 /* Should wait for DVS state change to be asserted if we have
247 * a GPIO for it, for now assume the device is configured
248 * for the fastest possible transition.
249 */
250
251 return 0;
252}
253
254static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
255 unsigned vsel)
256{
257 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
258 struct wm831x *wm831x = dcdc->wm831x;
259 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
260 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
261 int ret;
262
263 /* If this value is already set then do a GPIO update if we can */
264 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
265 return wm831x_buckv_set_dvs(rdev, 0);
266
267 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
268 return wm831x_buckv_set_dvs(rdev, 1);
269
270 /* Always set the ON status to the minimum voltage */
271 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
272 if (ret < 0)
273 return ret;
274 dcdc->on_vsel = vsel;
275
276 if (!dcdc->dvs_gpio)
277 return ret;
278
279 /* Kick the voltage transition now */
280 ret = wm831x_buckv_set_dvs(rdev, 0);
281 if (ret < 0)
282 return ret;
283
284 /*
285 * If this VSEL is higher than the last one we've seen then
286 * remember it as the DVS VSEL. This is optimised for CPUfreq
287 * usage where we want to get to the highest voltage very
288 * quickly.
289 */
290 if (vsel > dcdc->dvs_vsel) {
291 ret = wm831x_set_bits(wm831x, dvs_reg,
292 WM831X_DC1_DVS_VSEL_MASK,
293 vsel);
294 if (ret == 0)
295 dcdc->dvs_vsel = vsel;
296 else
297 dev_warn(wm831x->dev,
298 "Failed to set DCDC DVS VSEL: %d\n", ret);
299 }
300
301 return 0;
302}
303
304static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
305 int uV)
306{
307 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
308 struct wm831x *wm831x = dcdc->wm831x;
309 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
310 int vsel;
311
312 vsel = wm831x_buckv_map_voltage(rdev, uV, uV);
313 if (vsel < 0)
314 return vsel;
315
316 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
317}
318
319static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
320{
321 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
322
323 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
324 return dcdc->dvs_vsel;
325 else
326 return dcdc->on_vsel;
327}
328
329/* Current limit options */
330static u16 wm831x_dcdc_ilim[] = {
331 125, 250, 375, 500, 625, 750, 875, 1000
332};
333
334static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
335 int min_uA, int max_uA)
336{
337 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
338 struct wm831x *wm831x = dcdc->wm831x;
339 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
340 int i;
341
342 for (i = ARRAY_SIZE(wm831x_dcdc_ilim) - 1; i >= 0; i--) {
343 if ((min_uA <= wm831x_dcdc_ilim[i]) &&
344 (wm831x_dcdc_ilim[i] <= max_uA))
345 return wm831x_set_bits(wm831x, reg,
346 WM831X_DC1_HC_THR_MASK,
347 i << WM831X_DC1_HC_THR_SHIFT);
348 }
349
350 return -EINVAL;
351}
352
353static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
354{
355 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
356 struct wm831x *wm831x = dcdc->wm831x;
357 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
358 int val;
359
360 val = wm831x_reg_read(wm831x, reg);
361 if (val < 0)
362 return val;
363
364 val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
365 return wm831x_dcdc_ilim[val];
366}
367
368static const struct regulator_ops wm831x_buckv_ops = {
369 .set_voltage_sel = wm831x_buckv_set_voltage_sel,
370 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
371 .list_voltage = wm831x_buckv_list_voltage,
372 .map_voltage = wm831x_buckv_map_voltage,
373 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
374 .set_current_limit = wm831x_buckv_set_current_limit,
375 .get_current_limit = wm831x_buckv_get_current_limit,
376
377 .is_enabled = regulator_is_enabled_regmap,
378 .enable = regulator_enable_regmap,
379 .disable = regulator_disable_regmap,
380 .get_status = wm831x_dcdc_get_status,
381 .get_mode = wm831x_dcdc_get_mode,
382 .set_mode = wm831x_dcdc_set_mode,
383 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
384};
385
386/*
387 * Set up DVS control. We just log errors since we can still run
388 * (with reduced performance) if we fail.
389 */
390static void wm831x_buckv_dvs_init(struct platform_device *pdev,
391 struct wm831x_dcdc *dcdc,
392 struct wm831x_buckv_pdata *pdata)
393{
394 struct wm831x *wm831x = dcdc->wm831x;
395 int ret;
396 u16 ctrl;
397
398 if (!pdata || !pdata->dvs_gpio)
399 return;
400
401 /* gpiolib won't let us read the GPIO status so pick the higher
402 * of the two existing voltages so we take it as platform data.
403 */
404 dcdc->dvs_gpio_state = pdata->dvs_init_state;
405
406 ret = devm_gpio_request_one(&pdev->dev, pdata->dvs_gpio,
407 dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
408 "DCDC DVS");
409 if (ret < 0) {
410 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
411 dcdc->name, ret);
412 return;
413 }
414
415 dcdc->dvs_gpio = pdata->dvs_gpio;
416
417 switch (pdata->dvs_control_src) {
418 case 1:
419 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
420 break;
421 case 2:
422 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
423 break;
424 default:
425 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
426 pdata->dvs_control_src, dcdc->name);
427 return;
428 }
429
430 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
431 * to make bootstrapping a bit smoother.
432 */
433 if (!dcdc->dvs_vsel) {
434 ret = wm831x_set_bits(wm831x,
435 dcdc->base + WM831X_DCDC_DVS_CONTROL,
436 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
437 if (ret == 0)
438 dcdc->dvs_vsel = dcdc->on_vsel;
439 else
440 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
441 ret);
442 }
443
444 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
445 WM831X_DC1_DVS_SRC_MASK, ctrl);
446 if (ret < 0) {
447 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
448 dcdc->name, ret);
449 }
450}
451
452static int wm831x_buckv_probe(struct platform_device *pdev)
453{
454 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
455 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
456 struct regulator_config config = { };
457 int id;
458 struct wm831x_dcdc *dcdc;
459 struct resource *res;
460 int ret, irq;
461
462 if (pdata && pdata->wm831x_num)
463 id = (pdata->wm831x_num * 10) + 1;
464 else
465 id = 0;
466 id = pdev->id - id;
467
468 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
469
470 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
471 GFP_KERNEL);
472 if (!dcdc)
473 return -ENOMEM;
474
475 dcdc->wm831x = wm831x;
476
477 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
478 if (res == NULL) {
479 dev_err(&pdev->dev, "No REG resource\n");
480 ret = -EINVAL;
481 goto err;
482 }
483 dcdc->base = res->start;
484
485 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
486 dcdc->desc.name = dcdc->name;
487
488 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
489 "DC%dVDD", id + 1);
490 dcdc->desc.supply_name = dcdc->supply_name;
491
492 dcdc->desc.id = id;
493 dcdc->desc.type = REGULATOR_VOLTAGE;
494 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
495 dcdc->desc.ops = &wm831x_buckv_ops;
496 dcdc->desc.owner = THIS_MODULE;
497 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
498 dcdc->desc.enable_mask = 1 << id;
499
500 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
501 if (ret < 0) {
502 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
503 goto err;
504 }
505 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
506
507 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
508 if (ret < 0) {
509 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
510 goto err;
511 }
512 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
513
514 if (pdata && pdata->dcdc[id])
515 wm831x_buckv_dvs_init(pdev, dcdc,
516 pdata->dcdc[id]->driver_data);
517
518 config.dev = pdev->dev.parent;
519 if (pdata)
520 config.init_data = pdata->dcdc[id];
521 config.driver_data = dcdc;
522 config.regmap = wm831x->regmap;
523
524 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
525 &config);
526 if (IS_ERR(dcdc->regulator)) {
527 ret = PTR_ERR(dcdc->regulator);
528 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
529 id + 1, ret);
530 goto err;
531 }
532
533 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
534 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
535 wm831x_dcdc_uv_irq,
536 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
537 dcdc->name, dcdc);
538 if (ret != 0) {
539 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
540 irq, ret);
541 goto err;
542 }
543
544 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
545 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
546 wm831x_dcdc_oc_irq,
547 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
548 dcdc->name, dcdc);
549 if (ret != 0) {
550 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
551 irq, ret);
552 goto err;
553 }
554
555 platform_set_drvdata(pdev, dcdc);
556
557 return 0;
558
559err:
560 return ret;
561}
562
563static struct platform_driver wm831x_buckv_driver = {
564 .probe = wm831x_buckv_probe,
565 .driver = {
566 .name = "wm831x-buckv",
567 },
568};
569
570/*
571 * BUCKP specifics
572 */
573
574static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
575{
576 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
577 struct wm831x *wm831x = dcdc->wm831x;
578 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
579 int sel;
580
581 sel = regulator_map_voltage_linear(rdev, uV, uV);
582 if (sel < 0)
583 return sel;
584
585 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
586}
587
588static const struct regulator_ops wm831x_buckp_ops = {
589 .set_voltage_sel = regulator_set_voltage_sel_regmap,
590 .get_voltage_sel = regulator_get_voltage_sel_regmap,
591 .list_voltage = regulator_list_voltage_linear,
592 .map_voltage = regulator_map_voltage_linear,
593 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
594
595 .is_enabled = regulator_is_enabled_regmap,
596 .enable = regulator_enable_regmap,
597 .disable = regulator_disable_regmap,
598 .get_status = wm831x_dcdc_get_status,
599 .get_mode = wm831x_dcdc_get_mode,
600 .set_mode = wm831x_dcdc_set_mode,
601 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
602};
603
604static int wm831x_buckp_probe(struct platform_device *pdev)
605{
606 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
607 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
608 struct regulator_config config = { };
609 int id;
610 struct wm831x_dcdc *dcdc;
611 struct resource *res;
612 int ret, irq;
613
614 if (pdata && pdata->wm831x_num)
615 id = (pdata->wm831x_num * 10) + 1;
616 else
617 id = 0;
618 id = pdev->id - id;
619
620 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
621
622 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
623 GFP_KERNEL);
624 if (!dcdc)
625 return -ENOMEM;
626
627 dcdc->wm831x = wm831x;
628
629 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
630 if (res == NULL) {
631 dev_err(&pdev->dev, "No REG resource\n");
632 ret = -EINVAL;
633 goto err;
634 }
635 dcdc->base = res->start;
636
637 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
638 dcdc->desc.name = dcdc->name;
639
640 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
641 "DC%dVDD", id + 1);
642 dcdc->desc.supply_name = dcdc->supply_name;
643
644 dcdc->desc.id = id;
645 dcdc->desc.type = REGULATOR_VOLTAGE;
646 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
647 dcdc->desc.ops = &wm831x_buckp_ops;
648 dcdc->desc.owner = THIS_MODULE;
649 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
650 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
651 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
652 dcdc->desc.enable_mask = 1 << id;
653 dcdc->desc.min_uV = 850000;
654 dcdc->desc.uV_step = 25000;
655
656 config.dev = pdev->dev.parent;
657 if (pdata)
658 config.init_data = pdata->dcdc[id];
659 config.driver_data = dcdc;
660 config.regmap = wm831x->regmap;
661
662 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
663 &config);
664 if (IS_ERR(dcdc->regulator)) {
665 ret = PTR_ERR(dcdc->regulator);
666 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
667 id + 1, ret);
668 goto err;
669 }
670
671 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
672 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
673 wm831x_dcdc_uv_irq,
674 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
675 dcdc->name, dcdc);
676 if (ret != 0) {
677 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
678 irq, ret);
679 goto err;
680 }
681
682 platform_set_drvdata(pdev, dcdc);
683
684 return 0;
685
686err:
687 return ret;
688}
689
690static struct platform_driver wm831x_buckp_driver = {
691 .probe = wm831x_buckp_probe,
692 .driver = {
693 .name = "wm831x-buckp",
694 },
695};
696
697/*
698 * DCDC boost convertors
699 */
700
701static int wm831x_boostp_get_status(struct regulator_dev *rdev)
702{
703 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
704 struct wm831x *wm831x = dcdc->wm831x;
705 int ret;
706
707 /* First, check for errors */
708 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
709 if (ret < 0)
710 return ret;
711
712 if (ret & (1 << rdev_get_id(rdev))) {
713 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
714 rdev_get_id(rdev) + 1);
715 return REGULATOR_STATUS_ERROR;
716 }
717
718 /* Is the regulator on? */
719 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
720 if (ret < 0)
721 return ret;
722 if (ret & (1 << rdev_get_id(rdev)))
723 return REGULATOR_STATUS_ON;
724 else
725 return REGULATOR_STATUS_OFF;
726}
727
728static const struct regulator_ops wm831x_boostp_ops = {
729 .get_status = wm831x_boostp_get_status,
730
731 .is_enabled = regulator_is_enabled_regmap,
732 .enable = regulator_enable_regmap,
733 .disable = regulator_disable_regmap,
734};
735
736static int wm831x_boostp_probe(struct platform_device *pdev)
737{
738 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
739 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
740 struct regulator_config config = { };
741 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
742 struct wm831x_dcdc *dcdc;
743 struct resource *res;
744 int ret, irq;
745
746 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
747
748 if (pdata == NULL || pdata->dcdc[id] == NULL)
749 return -ENODEV;
750
751 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
752 if (!dcdc)
753 return -ENOMEM;
754
755 dcdc->wm831x = wm831x;
756
757 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
758 if (res == NULL) {
759 dev_err(&pdev->dev, "No REG resource\n");
760 return -EINVAL;
761 }
762 dcdc->base = res->start;
763
764 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
765 dcdc->desc.name = dcdc->name;
766 dcdc->desc.id = id;
767 dcdc->desc.type = REGULATOR_VOLTAGE;
768 dcdc->desc.ops = &wm831x_boostp_ops;
769 dcdc->desc.owner = THIS_MODULE;
770 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
771 dcdc->desc.enable_mask = 1 << id;
772
773 config.dev = pdev->dev.parent;
774 if (pdata)
775 config.init_data = pdata->dcdc[id];
776 config.driver_data = dcdc;
777 config.regmap = wm831x->regmap;
778
779 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
780 &config);
781 if (IS_ERR(dcdc->regulator)) {
782 ret = PTR_ERR(dcdc->regulator);
783 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
784 id + 1, ret);
785 return ret;
786 }
787
788 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
789 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
790 wm831x_dcdc_uv_irq,
791 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
792 dcdc->name,
793 dcdc);
794 if (ret != 0) {
795 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
796 irq, ret);
797 return ret;
798 }
799
800 platform_set_drvdata(pdev, dcdc);
801
802 return 0;
803}
804
805static struct platform_driver wm831x_boostp_driver = {
806 .probe = wm831x_boostp_probe,
807 .driver = {
808 .name = "wm831x-boostp",
809 },
810};
811
812/*
813 * External Power Enable
814 *
815 * These aren't actually DCDCs but look like them in hardware so share
816 * code.
817 */
818
819#define WM831X_EPE_BASE 6
820
821static const struct regulator_ops wm831x_epe_ops = {
822 .is_enabled = regulator_is_enabled_regmap,
823 .enable = regulator_enable_regmap,
824 .disable = regulator_disable_regmap,
825 .get_status = wm831x_dcdc_get_status,
826};
827
828static int wm831x_epe_probe(struct platform_device *pdev)
829{
830 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
831 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
832 struct regulator_config config = { };
833 int id = pdev->id % ARRAY_SIZE(pdata->epe);
834 struct wm831x_dcdc *dcdc;
835 int ret;
836
837 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
838
839 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
840 if (!dcdc)
841 return -ENOMEM;
842
843 dcdc->wm831x = wm831x;
844
845 /* For current parts this is correct; probably need to revisit
846 * in future.
847 */
848 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
849 dcdc->desc.name = dcdc->name;
850 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
851 dcdc->desc.ops = &wm831x_epe_ops;
852 dcdc->desc.type = REGULATOR_VOLTAGE;
853 dcdc->desc.owner = THIS_MODULE;
854 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
855 dcdc->desc.enable_mask = 1 << dcdc->desc.id;
856
857 config.dev = pdev->dev.parent;
858 if (pdata)
859 config.init_data = pdata->epe[id];
860 config.driver_data = dcdc;
861 config.regmap = wm831x->regmap;
862
863 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
864 &config);
865 if (IS_ERR(dcdc->regulator)) {
866 ret = PTR_ERR(dcdc->regulator);
867 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
868 id + 1, ret);
869 goto err;
870 }
871
872 platform_set_drvdata(pdev, dcdc);
873
874 return 0;
875
876err:
877 return ret;
878}
879
880static struct platform_driver wm831x_epe_driver = {
881 .probe = wm831x_epe_probe,
882 .driver = {
883 .name = "wm831x-epe",
884 },
885};
886
887static struct platform_driver * const drivers[] = {
888 &wm831x_buckv_driver,
889 &wm831x_buckp_driver,
890 &wm831x_boostp_driver,
891 &wm831x_epe_driver,
892};
893
894static int __init wm831x_dcdc_init(void)
895{
896 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
897}
898subsys_initcall(wm831x_dcdc_init);
899
900static void __exit wm831x_dcdc_exit(void)
901{
902 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
903}
904module_exit(wm831x_dcdc_exit);
905
906/* Module information */
907MODULE_AUTHOR("Mark Brown");
908MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
909MODULE_LICENSE("GPL");
910MODULE_ALIAS("platform:wm831x-buckv");
911MODULE_ALIAS("platform:wm831x-buckp");
912MODULE_ALIAS("platform:wm831x-boostp");
913MODULE_ALIAS("platform:wm831x-epe");