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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 6
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 struct regulator_desc desc;
54 int base;
55 struct wm831x *wm831x;
56 struct regulator_dev *regulator;
57 int dvs_gpio;
58 int dvs_gpio_state;
59 int on_vsel;
60 int dvs_vsel;
61};
62
63static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
64{
65 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
66 struct wm831x *wm831x = dcdc->wm831x;
67 int mask = 1 << rdev_get_id(rdev);
68 int reg;
69
70 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
71 if (reg < 0)
72 return reg;
73
74 if (reg & mask)
75 return 1;
76 else
77 return 0;
78}
79
80static int wm831x_dcdc_enable(struct regulator_dev *rdev)
81{
82 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
83 struct wm831x *wm831x = dcdc->wm831x;
84 int mask = 1 << rdev_get_id(rdev);
85
86 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
87}
88
89static int wm831x_dcdc_disable(struct regulator_dev *rdev)
90{
91 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
92 struct wm831x *wm831x = dcdc->wm831x;
93 int mask = 1 << rdev_get_id(rdev);
94
95 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
96}
97
98static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
99
100{
101 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
102 struct wm831x *wm831x = dcdc->wm831x;
103 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
104 int val;
105
106 val = wm831x_reg_read(wm831x, reg);
107 if (val < 0)
108 return val;
109
110 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
111
112 switch (val) {
113 case WM831X_DCDC_MODE_FAST:
114 return REGULATOR_MODE_FAST;
115 case WM831X_DCDC_MODE_NORMAL:
116 return REGULATOR_MODE_NORMAL;
117 case WM831X_DCDC_MODE_STANDBY:
118 return REGULATOR_MODE_STANDBY;
119 case WM831X_DCDC_MODE_IDLE:
120 return REGULATOR_MODE_IDLE;
121 default:
122 BUG();
123 return -EINVAL;
124 }
125}
126
127static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
128 unsigned int mode)
129{
130 int val;
131
132 switch (mode) {
133 case REGULATOR_MODE_FAST:
134 val = WM831X_DCDC_MODE_FAST;
135 break;
136 case REGULATOR_MODE_NORMAL:
137 val = WM831X_DCDC_MODE_NORMAL;
138 break;
139 case REGULATOR_MODE_STANDBY:
140 val = WM831X_DCDC_MODE_STANDBY;
141 break;
142 case REGULATOR_MODE_IDLE:
143 val = WM831X_DCDC_MODE_IDLE;
144 break;
145 default:
146 return -EINVAL;
147 }
148
149 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
150 val << WM831X_DC1_ON_MODE_SHIFT);
151}
152
153static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
154{
155 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
156 struct wm831x *wm831x = dcdc->wm831x;
157 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
158
159 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
160}
161
162static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
163 unsigned int mode)
164{
165 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
166 struct wm831x *wm831x = dcdc->wm831x;
167 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
168
169 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
170}
171
172static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
173{
174 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
175 struct wm831x *wm831x = dcdc->wm831x;
176 int ret;
177
178 /* First, check for errors */
179 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
180 if (ret < 0)
181 return ret;
182
183 if (ret & (1 << rdev_get_id(rdev))) {
184 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
185 rdev_get_id(rdev) + 1);
186 return REGULATOR_STATUS_ERROR;
187 }
188
189 /* DCDC1 and DCDC2 can additionally detect high voltage/current */
190 if (rdev_get_id(rdev) < 2) {
191 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
192 dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
193 rdev_get_id(rdev) + 1);
194 return REGULATOR_STATUS_ERROR;
195 }
196
197 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
198 dev_dbg(wm831x->dev, "DCDC%d over current\n",
199 rdev_get_id(rdev) + 1);
200 return REGULATOR_STATUS_ERROR;
201 }
202 }
203
204 /* Is the regulator on? */
205 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
206 if (ret < 0)
207 return ret;
208 if (!(ret & (1 << rdev_get_id(rdev))))
209 return REGULATOR_STATUS_OFF;
210
211 /* TODO: When we handle hardware control modes so we can report the
212 * current mode. */
213 return REGULATOR_STATUS_ON;
214}
215
216static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
217{
218 struct wm831x_dcdc *dcdc = data;
219
220 regulator_notifier_call_chain(dcdc->regulator,
221 REGULATOR_EVENT_UNDER_VOLTAGE,
222 NULL);
223
224 return IRQ_HANDLED;
225}
226
227static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
228{
229 struct wm831x_dcdc *dcdc = data;
230
231 regulator_notifier_call_chain(dcdc->regulator,
232 REGULATOR_EVENT_OVER_CURRENT,
233 NULL);
234
235 return IRQ_HANDLED;
236}
237
238/*
239 * BUCKV specifics
240 */
241
242static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
243 unsigned selector)
244{
245 if (selector <= 0x8)
246 return 600000;
247 if (selector <= WM831X_BUCKV_MAX_SELECTOR)
248 return 600000 + ((selector - 0x8) * 12500);
249 return -EINVAL;
250}
251
252static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
253 int min_uV, int max_uV)
254{
255 u16 vsel;
256
257 if (min_uV < 600000)
258 vsel = 0;
259 else if (min_uV <= 1800000)
260 vsel = ((min_uV - 600000) / 12500) + 8;
261 else
262 return -EINVAL;
263
264 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
265 return -EINVAL;
266
267 return vsel;
268}
269
270static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
271{
272 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
273
274 if (state == dcdc->dvs_gpio_state)
275 return 0;
276
277 dcdc->dvs_gpio_state = state;
278 gpio_set_value(dcdc->dvs_gpio, state);
279
280 /* Should wait for DVS state change to be asserted if we have
281 * a GPIO for it, for now assume the device is configured
282 * for the fastest possible transition.
283 */
284
285 return 0;
286}
287
288static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
289 int min_uV, int max_uV, unsigned *selector)
290{
291 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
292 struct wm831x *wm831x = dcdc->wm831x;
293 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
294 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
295 int vsel, ret;
296
297 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
298 if (vsel < 0)
299 return vsel;
300
301 *selector = vsel;
302
303 /* If this value is already set then do a GPIO update if we can */
304 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
305 return wm831x_buckv_set_dvs(rdev, 0);
306
307 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
308 return wm831x_buckv_set_dvs(rdev, 1);
309
310 /* Always set the ON status to the minimum voltage */
311 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
312 if (ret < 0)
313 return ret;
314 dcdc->on_vsel = vsel;
315
316 if (!dcdc->dvs_gpio)
317 return ret;
318
319 /* Kick the voltage transition now */
320 ret = wm831x_buckv_set_dvs(rdev, 0);
321 if (ret < 0)
322 return ret;
323
324 /*
325 * If this VSEL is higher than the last one we've seen then
326 * remember it as the DVS VSEL. This is optimised for CPUfreq
327 * usage where we want to get to the highest voltage very
328 * quickly.
329 */
330 if (vsel > dcdc->dvs_vsel) {
331 ret = wm831x_set_bits(wm831x, dvs_reg,
332 WM831X_DC1_DVS_VSEL_MASK,
333 dcdc->dvs_vsel);
334 if (ret == 0)
335 dcdc->dvs_vsel = vsel;
336 else
337 dev_warn(wm831x->dev,
338 "Failed to set DCDC DVS VSEL: %d\n", ret);
339 }
340
341 return 0;
342}
343
344static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
345 int uV)
346{
347 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
348 struct wm831x *wm831x = dcdc->wm831x;
349 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
350 int vsel;
351
352 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
353 if (vsel < 0)
354 return vsel;
355
356 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
357}
358
359static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
360{
361 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
362
363 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
364 return dcdc->dvs_vsel;
365 else
366 return dcdc->on_vsel;
367}
368
369/* Current limit options */
370static u16 wm831x_dcdc_ilim[] = {
371 125, 250, 375, 500, 625, 750, 875, 1000
372};
373
374static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
375 int min_uA, int max_uA)
376{
377 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
378 struct wm831x *wm831x = dcdc->wm831x;
379 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
380 int i;
381
382 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
383 if (max_uA <= wm831x_dcdc_ilim[i])
384 break;
385 }
386 if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
387 return -EINVAL;
388
389 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
390}
391
392static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
393{
394 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
395 struct wm831x *wm831x = dcdc->wm831x;
396 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
397 int val;
398
399 val = wm831x_reg_read(wm831x, reg);
400 if (val < 0)
401 return val;
402
403 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
404}
405
406static struct regulator_ops wm831x_buckv_ops = {
407 .set_voltage = wm831x_buckv_set_voltage,
408 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
409 .list_voltage = wm831x_buckv_list_voltage,
410 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
411 .set_current_limit = wm831x_buckv_set_current_limit,
412 .get_current_limit = wm831x_buckv_get_current_limit,
413
414 .is_enabled = wm831x_dcdc_is_enabled,
415 .enable = wm831x_dcdc_enable,
416 .disable = wm831x_dcdc_disable,
417 .get_status = wm831x_dcdc_get_status,
418 .get_mode = wm831x_dcdc_get_mode,
419 .set_mode = wm831x_dcdc_set_mode,
420 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
421};
422
423/*
424 * Set up DVS control. We just log errors since we can still run
425 * (with reduced performance) if we fail.
426 */
427static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
428 struct wm831x_buckv_pdata *pdata)
429{
430 struct wm831x *wm831x = dcdc->wm831x;
431 int ret;
432 u16 ctrl;
433
434 if (!pdata || !pdata->dvs_gpio)
435 return;
436
437 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
438 if (ret < 0) {
439 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
440 dcdc->name, ret);
441 return;
442 }
443
444 /* gpiolib won't let us read the GPIO status so pick the higher
445 * of the two existing voltages so we take it as platform data.
446 */
447 dcdc->dvs_gpio_state = pdata->dvs_init_state;
448
449 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
450 if (ret < 0) {
451 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
452 dcdc->name, ret);
453 gpio_free(pdata->dvs_gpio);
454 return;
455 }
456
457 dcdc->dvs_gpio = pdata->dvs_gpio;
458
459 switch (pdata->dvs_control_src) {
460 case 1:
461 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
462 break;
463 case 2:
464 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
465 break;
466 default:
467 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
468 pdata->dvs_control_src, dcdc->name);
469 return;
470 }
471
472 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
473 * to make bootstrapping a bit smoother.
474 */
475 if (!dcdc->dvs_vsel) {
476 ret = wm831x_set_bits(wm831x,
477 dcdc->base + WM831X_DCDC_DVS_CONTROL,
478 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
479 if (ret == 0)
480 dcdc->dvs_vsel = dcdc->on_vsel;
481 else
482 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
483 ret);
484 }
485
486 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
487 WM831X_DC1_DVS_SRC_MASK, ctrl);
488 if (ret < 0) {
489 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
490 dcdc->name, ret);
491 }
492}
493
494static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
495{
496 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
497 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
498 int id;
499 struct wm831x_dcdc *dcdc;
500 struct resource *res;
501 int ret, irq;
502
503 if (pdata && pdata->wm831x_num)
504 id = (pdata->wm831x_num * 10) + 1;
505 else
506 id = 0;
507 id = pdev->id - id;
508
509 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
510
511 if (pdata == NULL || pdata->dcdc[id] == NULL)
512 return -ENODEV;
513
514 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
515 if (dcdc == NULL) {
516 dev_err(&pdev->dev, "Unable to allocate private data\n");
517 return -ENOMEM;
518 }
519
520 dcdc->wm831x = wm831x;
521
522 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
523 if (res == NULL) {
524 dev_err(&pdev->dev, "No I/O resource\n");
525 ret = -EINVAL;
526 goto err;
527 }
528 dcdc->base = res->start;
529
530 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
531 dcdc->desc.name = dcdc->name;
532 dcdc->desc.id = id;
533 dcdc->desc.type = REGULATOR_VOLTAGE;
534 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
535 dcdc->desc.ops = &wm831x_buckv_ops;
536 dcdc->desc.owner = THIS_MODULE;
537
538 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
539 if (ret < 0) {
540 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
541 goto err;
542 }
543 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
544
545 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
546 if (ret < 0) {
547 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
548 goto err;
549 }
550 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
551
552 if (pdata->dcdc[id])
553 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
554
555 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
556 pdata->dcdc[id], dcdc);
557 if (IS_ERR(dcdc->regulator)) {
558 ret = PTR_ERR(dcdc->regulator);
559 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
560 id + 1, ret);
561 goto err;
562 }
563
564 irq = platform_get_irq_byname(pdev, "UV");
565 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
566 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
567 if (ret != 0) {
568 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
569 irq, ret);
570 goto err_regulator;
571 }
572
573 irq = platform_get_irq_byname(pdev, "HC");
574 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
575 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
576 if (ret != 0) {
577 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
578 irq, ret);
579 goto err_uv;
580 }
581
582 platform_set_drvdata(pdev, dcdc);
583
584 return 0;
585
586err_uv:
587 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
588err_regulator:
589 regulator_unregister(dcdc->regulator);
590err:
591 if (dcdc->dvs_gpio)
592 gpio_free(dcdc->dvs_gpio);
593 kfree(dcdc);
594 return ret;
595}
596
597static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
598{
599 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
600
601 platform_set_drvdata(pdev, NULL);
602
603 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
604 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
605 regulator_unregister(dcdc->regulator);
606 if (dcdc->dvs_gpio)
607 gpio_free(dcdc->dvs_gpio);
608 kfree(dcdc);
609
610 return 0;
611}
612
613static struct platform_driver wm831x_buckv_driver = {
614 .probe = wm831x_buckv_probe,
615 .remove = __devexit_p(wm831x_buckv_remove),
616 .driver = {
617 .name = "wm831x-buckv",
618 .owner = THIS_MODULE,
619 },
620};
621
622/*
623 * BUCKP specifics
624 */
625
626static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
627 unsigned selector)
628{
629 if (selector <= WM831X_BUCKP_MAX_SELECTOR)
630 return 850000 + (selector * 25000);
631 else
632 return -EINVAL;
633}
634
635static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
636 int min_uV, int max_uV, int *selector)
637{
638 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
639 struct wm831x *wm831x = dcdc->wm831x;
640 u16 vsel;
641
642 if (min_uV <= 34000000)
643 vsel = (min_uV - 850000) / 25000;
644 else
645 return -EINVAL;
646
647 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
648 return -EINVAL;
649
650 *selector = vsel;
651
652 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
653}
654
655static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
656 int min_uV, int max_uV,
657 unsigned *selector)
658{
659 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
660 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
661
662 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
663 selector);
664}
665
666static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
667 int uV)
668{
669 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
670 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
671 unsigned selector;
672
673 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
674}
675
676static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
677{
678 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
679 struct wm831x *wm831x = dcdc->wm831x;
680 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
681 int val;
682
683 val = wm831x_reg_read(wm831x, reg);
684 if (val < 0)
685 return val;
686
687 return val & WM831X_DC3_ON_VSEL_MASK;
688}
689
690static struct regulator_ops wm831x_buckp_ops = {
691 .set_voltage = wm831x_buckp_set_voltage,
692 .get_voltage_sel = wm831x_buckp_get_voltage_sel,
693 .list_voltage = wm831x_buckp_list_voltage,
694 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
695
696 .is_enabled = wm831x_dcdc_is_enabled,
697 .enable = wm831x_dcdc_enable,
698 .disable = wm831x_dcdc_disable,
699 .get_status = wm831x_dcdc_get_status,
700 .get_mode = wm831x_dcdc_get_mode,
701 .set_mode = wm831x_dcdc_set_mode,
702 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
703};
704
705static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
706{
707 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
708 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
709 int id;
710 struct wm831x_dcdc *dcdc;
711 struct resource *res;
712 int ret, irq;
713
714 if (pdata && pdata->wm831x_num)
715 id = (pdata->wm831x_num * 10) + 1;
716 else
717 id = 0;
718 id = pdev->id - id;
719
720 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
721
722 if (pdata == NULL || pdata->dcdc[id] == NULL)
723 return -ENODEV;
724
725 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
726 if (dcdc == NULL) {
727 dev_err(&pdev->dev, "Unable to allocate private data\n");
728 return -ENOMEM;
729 }
730
731 dcdc->wm831x = wm831x;
732
733 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
734 if (res == NULL) {
735 dev_err(&pdev->dev, "No I/O resource\n");
736 ret = -EINVAL;
737 goto err;
738 }
739 dcdc->base = res->start;
740
741 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
742 dcdc->desc.name = dcdc->name;
743 dcdc->desc.id = id;
744 dcdc->desc.type = REGULATOR_VOLTAGE;
745 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
746 dcdc->desc.ops = &wm831x_buckp_ops;
747 dcdc->desc.owner = THIS_MODULE;
748
749 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
750 pdata->dcdc[id], dcdc);
751 if (IS_ERR(dcdc->regulator)) {
752 ret = PTR_ERR(dcdc->regulator);
753 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
754 id + 1, ret);
755 goto err;
756 }
757
758 irq = platform_get_irq_byname(pdev, "UV");
759 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
760 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
761 if (ret != 0) {
762 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
763 irq, ret);
764 goto err_regulator;
765 }
766
767 platform_set_drvdata(pdev, dcdc);
768
769 return 0;
770
771err_regulator:
772 regulator_unregister(dcdc->regulator);
773err:
774 kfree(dcdc);
775 return ret;
776}
777
778static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
779{
780 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
781
782 platform_set_drvdata(pdev, NULL);
783
784 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
785 regulator_unregister(dcdc->regulator);
786 kfree(dcdc);
787
788 return 0;
789}
790
791static struct platform_driver wm831x_buckp_driver = {
792 .probe = wm831x_buckp_probe,
793 .remove = __devexit_p(wm831x_buckp_remove),
794 .driver = {
795 .name = "wm831x-buckp",
796 .owner = THIS_MODULE,
797 },
798};
799
800/*
801 * DCDC boost convertors
802 */
803
804static int wm831x_boostp_get_status(struct regulator_dev *rdev)
805{
806 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
807 struct wm831x *wm831x = dcdc->wm831x;
808 int ret;
809
810 /* First, check for errors */
811 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
812 if (ret < 0)
813 return ret;
814
815 if (ret & (1 << rdev_get_id(rdev))) {
816 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
817 rdev_get_id(rdev) + 1);
818 return REGULATOR_STATUS_ERROR;
819 }
820
821 /* Is the regulator on? */
822 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
823 if (ret < 0)
824 return ret;
825 if (ret & (1 << rdev_get_id(rdev)))
826 return REGULATOR_STATUS_ON;
827 else
828 return REGULATOR_STATUS_OFF;
829}
830
831static struct regulator_ops wm831x_boostp_ops = {
832 .get_status = wm831x_boostp_get_status,
833
834 .is_enabled = wm831x_dcdc_is_enabled,
835 .enable = wm831x_dcdc_enable,
836 .disable = wm831x_dcdc_disable,
837};
838
839static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
840{
841 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
842 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
843 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
844 struct wm831x_dcdc *dcdc;
845 struct resource *res;
846 int ret, irq;
847
848 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
849
850 if (pdata == NULL || pdata->dcdc[id] == NULL)
851 return -ENODEV;
852
853 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
854 if (dcdc == NULL) {
855 dev_err(&pdev->dev, "Unable to allocate private data\n");
856 return -ENOMEM;
857 }
858
859 dcdc->wm831x = wm831x;
860
861 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
862 if (res == NULL) {
863 dev_err(&pdev->dev, "No I/O resource\n");
864 ret = -EINVAL;
865 goto err;
866 }
867 dcdc->base = res->start;
868
869 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
870 dcdc->desc.name = dcdc->name;
871 dcdc->desc.id = id;
872 dcdc->desc.type = REGULATOR_VOLTAGE;
873 dcdc->desc.ops = &wm831x_boostp_ops;
874 dcdc->desc.owner = THIS_MODULE;
875
876 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
877 pdata->dcdc[id], dcdc);
878 if (IS_ERR(dcdc->regulator)) {
879 ret = PTR_ERR(dcdc->regulator);
880 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
881 id + 1, ret);
882 goto err;
883 }
884
885 irq = platform_get_irq_byname(pdev, "UV");
886 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
887 IRQF_TRIGGER_RISING, dcdc->name,
888 dcdc);
889 if (ret != 0) {
890 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
891 irq, ret);
892 goto err_regulator;
893 }
894
895 platform_set_drvdata(pdev, dcdc);
896
897 return 0;
898
899err_regulator:
900 regulator_unregister(dcdc->regulator);
901err:
902 kfree(dcdc);
903 return ret;
904}
905
906static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
907{
908 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
909
910 platform_set_drvdata(pdev, NULL);
911
912 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
913 regulator_unregister(dcdc->regulator);
914 kfree(dcdc);
915
916 return 0;
917}
918
919static struct platform_driver wm831x_boostp_driver = {
920 .probe = wm831x_boostp_probe,
921 .remove = __devexit_p(wm831x_boostp_remove),
922 .driver = {
923 .name = "wm831x-boostp",
924 .owner = THIS_MODULE,
925 },
926};
927
928/*
929 * External Power Enable
930 *
931 * These aren't actually DCDCs but look like them in hardware so share
932 * code.
933 */
934
935#define WM831X_EPE_BASE 6
936
937static struct regulator_ops wm831x_epe_ops = {
938 .is_enabled = wm831x_dcdc_is_enabled,
939 .enable = wm831x_dcdc_enable,
940 .disable = wm831x_dcdc_disable,
941 .get_status = wm831x_dcdc_get_status,
942};
943
944static __devinit int wm831x_epe_probe(struct platform_device *pdev)
945{
946 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
947 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
948 int id = pdev->id % ARRAY_SIZE(pdata->epe);
949 struct wm831x_dcdc *dcdc;
950 int ret;
951
952 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
953
954 if (pdata == NULL || pdata->epe[id] == NULL)
955 return -ENODEV;
956
957 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
958 if (dcdc == NULL) {
959 dev_err(&pdev->dev, "Unable to allocate private data\n");
960 return -ENOMEM;
961 }
962
963 dcdc->wm831x = wm831x;
964
965 /* For current parts this is correct; probably need to revisit
966 * in future.
967 */
968 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
969 dcdc->desc.name = dcdc->name;
970 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
971 dcdc->desc.ops = &wm831x_epe_ops;
972 dcdc->desc.type = REGULATOR_VOLTAGE;
973 dcdc->desc.owner = THIS_MODULE;
974
975 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
976 pdata->epe[id], dcdc);
977 if (IS_ERR(dcdc->regulator)) {
978 ret = PTR_ERR(dcdc->regulator);
979 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
980 id + 1, ret);
981 goto err;
982 }
983
984 platform_set_drvdata(pdev, dcdc);
985
986 return 0;
987
988err:
989 kfree(dcdc);
990 return ret;
991}
992
993static __devexit int wm831x_epe_remove(struct platform_device *pdev)
994{
995 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
996
997 platform_set_drvdata(pdev, NULL);
998
999 regulator_unregister(dcdc->regulator);
1000 kfree(dcdc);
1001
1002 return 0;
1003}
1004
1005static struct platform_driver wm831x_epe_driver = {
1006 .probe = wm831x_epe_probe,
1007 .remove = __devexit_p(wm831x_epe_remove),
1008 .driver = {
1009 .name = "wm831x-epe",
1010 .owner = THIS_MODULE,
1011 },
1012};
1013
1014static int __init wm831x_dcdc_init(void)
1015{
1016 int ret;
1017 ret = platform_driver_register(&wm831x_buckv_driver);
1018 if (ret != 0)
1019 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1020
1021 ret = platform_driver_register(&wm831x_buckp_driver);
1022 if (ret != 0)
1023 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1024
1025 ret = platform_driver_register(&wm831x_boostp_driver);
1026 if (ret != 0)
1027 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1028
1029 ret = platform_driver_register(&wm831x_epe_driver);
1030 if (ret != 0)
1031 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1032
1033 return 0;
1034}
1035subsys_initcall(wm831x_dcdc_init);
1036
1037static void __exit wm831x_dcdc_exit(void)
1038{
1039 platform_driver_unregister(&wm831x_epe_driver);
1040 platform_driver_unregister(&wm831x_boostp_driver);
1041 platform_driver_unregister(&wm831x_buckp_driver);
1042 platform_driver_unregister(&wm831x_buckv_driver);
1043}
1044module_exit(wm831x_dcdc_exit);
1045
1046/* Module information */
1047MODULE_AUTHOR("Mark Brown");
1048MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1049MODULE_LICENSE("GPL");
1050MODULE_ALIAS("platform:wm831x-buckv");
1051MODULE_ALIAS("platform:wm831x-buckp");
1052MODULE_ALIAS("platform:wm831x-epe");
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 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
509 },
510};
511
512/*
513 * BUCKP specifics
514 */
515
516static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
517{
518 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
519 struct wm831x *wm831x = dcdc->wm831x;
520 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
521 int sel;
522
523 sel = regulator_map_voltage_linear(rdev, uV, uV);
524 if (sel < 0)
525 return sel;
526
527 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
528}
529
530static const struct regulator_ops wm831x_buckp_ops = {
531 .set_voltage_sel = regulator_set_voltage_sel_regmap,
532 .get_voltage_sel = regulator_get_voltage_sel_regmap,
533 .list_voltage = regulator_list_voltage_linear,
534 .map_voltage = regulator_map_voltage_linear,
535 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
536
537 .is_enabled = regulator_is_enabled_regmap,
538 .enable = regulator_enable_regmap,
539 .disable = regulator_disable_regmap,
540 .get_status = wm831x_dcdc_get_status,
541 .get_mode = wm831x_dcdc_get_mode,
542 .set_mode = wm831x_dcdc_set_mode,
543 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
544};
545
546static int wm831x_buckp_probe(struct platform_device *pdev)
547{
548 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
549 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
550 struct regulator_config config = { };
551 int id;
552 struct wm831x_dcdc *dcdc;
553 struct resource *res;
554 int ret, irq;
555
556 if (pdata && pdata->wm831x_num)
557 id = (pdata->wm831x_num * 10) + 1;
558 else
559 id = 0;
560 id = pdev->id - id;
561
562 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
563
564 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
565 GFP_KERNEL);
566 if (!dcdc)
567 return -ENOMEM;
568
569 dcdc->wm831x = wm831x;
570
571 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
572 if (res == NULL) {
573 dev_err(&pdev->dev, "No REG resource\n");
574 ret = -EINVAL;
575 goto err;
576 }
577 dcdc->base = res->start;
578
579 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
580 dcdc->desc.name = dcdc->name;
581
582 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
583 "DC%dVDD", id + 1);
584 dcdc->desc.supply_name = dcdc->supply_name;
585
586 dcdc->desc.id = id;
587 dcdc->desc.type = REGULATOR_VOLTAGE;
588 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
589 dcdc->desc.ops = &wm831x_buckp_ops;
590 dcdc->desc.owner = THIS_MODULE;
591 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
592 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
593 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
594 dcdc->desc.enable_mask = 1 << id;
595 dcdc->desc.min_uV = 850000;
596 dcdc->desc.uV_step = 25000;
597
598 config.dev = pdev->dev.parent;
599 if (pdata)
600 config.init_data = pdata->dcdc[id];
601 config.driver_data = dcdc;
602 config.regmap = wm831x->regmap;
603
604 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
605 &config);
606 if (IS_ERR(dcdc->regulator)) {
607 ret = PTR_ERR(dcdc->regulator);
608 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
609 id + 1, ret);
610 goto err;
611 }
612
613 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
614 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
615 wm831x_dcdc_uv_irq,
616 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
617 dcdc->name, dcdc);
618 if (ret != 0) {
619 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
620 irq, ret);
621 goto err;
622 }
623
624 platform_set_drvdata(pdev, dcdc);
625
626 return 0;
627
628err:
629 return ret;
630}
631
632static struct platform_driver wm831x_buckp_driver = {
633 .probe = wm831x_buckp_probe,
634 .driver = {
635 .name = "wm831x-buckp",
636 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
637 },
638};
639
640/*
641 * DCDC boost convertors
642 */
643
644static int wm831x_boostp_get_status(struct regulator_dev *rdev)
645{
646 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
647 struct wm831x *wm831x = dcdc->wm831x;
648 int ret;
649
650 /* First, check for errors */
651 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
652 if (ret < 0)
653 return ret;
654
655 if (ret & (1 << rdev_get_id(rdev))) {
656 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
657 rdev_get_id(rdev) + 1);
658 return REGULATOR_STATUS_ERROR;
659 }
660
661 /* Is the regulator on? */
662 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
663 if (ret < 0)
664 return ret;
665 if (ret & (1 << rdev_get_id(rdev)))
666 return REGULATOR_STATUS_ON;
667 else
668 return REGULATOR_STATUS_OFF;
669}
670
671static const struct regulator_ops wm831x_boostp_ops = {
672 .get_status = wm831x_boostp_get_status,
673
674 .is_enabled = regulator_is_enabled_regmap,
675 .enable = regulator_enable_regmap,
676 .disable = regulator_disable_regmap,
677};
678
679static int wm831x_boostp_probe(struct platform_device *pdev)
680{
681 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
682 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
683 struct regulator_config config = { };
684 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
685 struct wm831x_dcdc *dcdc;
686 struct resource *res;
687 int ret, irq;
688
689 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
690
691 if (pdata == NULL || pdata->dcdc[id] == NULL)
692 return -ENODEV;
693
694 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
695 if (!dcdc)
696 return -ENOMEM;
697
698 dcdc->wm831x = wm831x;
699
700 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
701 if (res == NULL) {
702 dev_err(&pdev->dev, "No REG resource\n");
703 return -EINVAL;
704 }
705 dcdc->base = res->start;
706
707 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
708 dcdc->desc.name = dcdc->name;
709 dcdc->desc.id = id;
710 dcdc->desc.type = REGULATOR_VOLTAGE;
711 dcdc->desc.ops = &wm831x_boostp_ops;
712 dcdc->desc.owner = THIS_MODULE;
713 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
714 dcdc->desc.enable_mask = 1 << id;
715
716 config.dev = pdev->dev.parent;
717 if (pdata)
718 config.init_data = pdata->dcdc[id];
719 config.driver_data = dcdc;
720 config.regmap = wm831x->regmap;
721
722 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
723 &config);
724 if (IS_ERR(dcdc->regulator)) {
725 ret = PTR_ERR(dcdc->regulator);
726 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
727 id + 1, ret);
728 return ret;
729 }
730
731 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
732 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
733 wm831x_dcdc_uv_irq,
734 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
735 dcdc->name,
736 dcdc);
737 if (ret != 0) {
738 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
739 irq, ret);
740 return ret;
741 }
742
743 platform_set_drvdata(pdev, dcdc);
744
745 return 0;
746}
747
748static struct platform_driver wm831x_boostp_driver = {
749 .probe = wm831x_boostp_probe,
750 .driver = {
751 .name = "wm831x-boostp",
752 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
753 },
754};
755
756/*
757 * External Power Enable
758 *
759 * These aren't actually DCDCs but look like them in hardware so share
760 * code.
761 */
762
763#define WM831X_EPE_BASE 6
764
765static const struct regulator_ops wm831x_epe_ops = {
766 .is_enabled = regulator_is_enabled_regmap,
767 .enable = regulator_enable_regmap,
768 .disable = regulator_disable_regmap,
769 .get_status = wm831x_dcdc_get_status,
770};
771
772static int wm831x_epe_probe(struct platform_device *pdev)
773{
774 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
775 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
776 struct regulator_config config = { };
777 int id = pdev->id % ARRAY_SIZE(pdata->epe);
778 struct wm831x_dcdc *dcdc;
779 int ret;
780
781 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
782
783 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
784 if (!dcdc)
785 return -ENOMEM;
786
787 dcdc->wm831x = wm831x;
788
789 /* For current parts this is correct; probably need to revisit
790 * in future.
791 */
792 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
793 dcdc->desc.name = dcdc->name;
794 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
795 dcdc->desc.ops = &wm831x_epe_ops;
796 dcdc->desc.type = REGULATOR_VOLTAGE;
797 dcdc->desc.owner = THIS_MODULE;
798 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
799 dcdc->desc.enable_mask = 1 << dcdc->desc.id;
800
801 config.dev = pdev->dev.parent;
802 if (pdata)
803 config.init_data = pdata->epe[id];
804 config.driver_data = dcdc;
805 config.regmap = wm831x->regmap;
806
807 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc,
808 &config);
809 if (IS_ERR(dcdc->regulator)) {
810 ret = PTR_ERR(dcdc->regulator);
811 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
812 id + 1, ret);
813 goto err;
814 }
815
816 platform_set_drvdata(pdev, dcdc);
817
818 return 0;
819
820err:
821 return ret;
822}
823
824static struct platform_driver wm831x_epe_driver = {
825 .probe = wm831x_epe_probe,
826 .driver = {
827 .name = "wm831x-epe",
828 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
829 },
830};
831
832static struct platform_driver * const drivers[] = {
833 &wm831x_buckv_driver,
834 &wm831x_buckp_driver,
835 &wm831x_boostp_driver,
836 &wm831x_epe_driver,
837};
838
839static int __init wm831x_dcdc_init(void)
840{
841 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
842}
843subsys_initcall(wm831x_dcdc_init);
844
845static void __exit wm831x_dcdc_exit(void)
846{
847 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
848}
849module_exit(wm831x_dcdc_exit);
850
851/* Module information */
852MODULE_AUTHOR("Mark Brown");
853MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
854MODULE_LICENSE("GPL");
855MODULE_ALIAS("platform:wm831x-buckv");
856MODULE_ALIAS("platform:wm831x-buckp");
857MODULE_ALIAS("platform:wm831x-boostp");
858MODULE_ALIAS("platform:wm831x-epe");