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1/*
2 * max77686.c - Regulator driver for the Maxim 77686
3 *
4 * Copyright (C) 2012 Samsung Electronics
5 * Chiwoong Byun <woong.byun@smasung.com>
6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This driver is based on max8997.c
23 */
24
25#include <linux/kernel.h>
26#include <linux/bug.h>
27#include <linux/err.h>
28#include <linux/gpio.h>
29#include <linux/slab.h>
30#include <linux/platform_device.h>
31#include <linux/regulator/driver.h>
32#include <linux/regulator/machine.h>
33#include <linux/regulator/of_regulator.h>
34#include <linux/mfd/max77686.h>
35#include <linux/mfd/max77686-private.h>
36
37#define MAX77686_LDO_MINUV 800000
38#define MAX77686_LDO_UVSTEP 50000
39#define MAX77686_LDO_LOW_MINUV 800000
40#define MAX77686_LDO_LOW_UVSTEP 25000
41#define MAX77686_BUCK_MINUV 750000
42#define MAX77686_BUCK_UVSTEP 50000
43#define MAX77686_RAMP_DELAY 100000 /* uV/us */
44#define MAX77686_DVS_RAMP_DELAY 27500 /* uV/us */
45#define MAX77686_DVS_MINUV 600000
46#define MAX77686_DVS_UVSTEP 12500
47
48#define MAX77686_OPMODE_SHIFT 6
49#define MAX77686_OPMODE_BUCK234_SHIFT 4
50#define MAX77686_OPMODE_MASK 0x3
51
52#define MAX77686_VSEL_MASK 0x3F
53#define MAX77686_DVS_VSEL_MASK 0xFF
54
55#define MAX77686_RAMP_RATE_MASK 0xC0
56
57#define MAX77686_REGULATORS MAX77686_REG_MAX
58#define MAX77686_LDOS 26
59
60enum max77686_ramp_rate {
61 RAMP_RATE_13P75MV,
62 RAMP_RATE_27P5MV,
63 RAMP_RATE_55MV,
64 RAMP_RATE_NO_CTRL, /* 100mV/us */
65};
66
67struct max77686_data {
68 struct regulator_dev *rdev[MAX77686_REGULATORS];
69 unsigned int opmode[MAX77686_REGULATORS];
70};
71
72/* Some BUCKS supports Normal[ON/OFF] mode during suspend */
73static int max77686_buck_set_suspend_disable(struct regulator_dev *rdev)
74{
75 unsigned int val;
76 struct max77686_data *max77686 = rdev_get_drvdata(rdev);
77 int ret, id = rdev_get_id(rdev);
78
79 if (id == MAX77686_BUCK1)
80 val = 0x1;
81 else
82 val = 0x1 << MAX77686_OPMODE_BUCK234_SHIFT;
83
84 ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
85 rdev->desc->enable_mask, val);
86 if (ret)
87 return ret;
88
89 max77686->opmode[id] = val;
90 return 0;
91}
92
93/* Some LDOs supports [LPM/Normal]ON mode during suspend state */
94static int max77686_set_suspend_mode(struct regulator_dev *rdev,
95 unsigned int mode)
96{
97 struct max77686_data *max77686 = rdev_get_drvdata(rdev);
98 unsigned int val;
99 int ret, id = rdev_get_id(rdev);
100
101 /* BUCK[5-9] doesn't support this feature */
102 if (id >= MAX77686_BUCK5)
103 return 0;
104
105 switch (mode) {
106 case REGULATOR_MODE_IDLE: /* ON in LP Mode */
107 val = 0x2 << MAX77686_OPMODE_SHIFT;
108 break;
109 case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
110 val = 0x3 << MAX77686_OPMODE_SHIFT;
111 break;
112 default:
113 pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
114 rdev->desc->name, mode);
115 return -EINVAL;
116 }
117
118 ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
119 rdev->desc->enable_mask, val);
120 if (ret)
121 return ret;
122
123 max77686->opmode[id] = val;
124 return 0;
125}
126
127/* Some LDOs supports LPM-ON/OFF/Normal-ON mode during suspend state */
128static int max77686_ldo_set_suspend_mode(struct regulator_dev *rdev,
129 unsigned int mode)
130{
131 unsigned int val;
132 struct max77686_data *max77686 = rdev_get_drvdata(rdev);
133 int ret;
134
135 switch (mode) {
136 case REGULATOR_MODE_STANDBY: /* switch off */
137 val = 0x1 << MAX77686_OPMODE_SHIFT;
138 break;
139 case REGULATOR_MODE_IDLE: /* ON in LP Mode */
140 val = 0x2 << MAX77686_OPMODE_SHIFT;
141 break;
142 case REGULATOR_MODE_NORMAL: /* ON in Normal Mode */
143 val = 0x3 << MAX77686_OPMODE_SHIFT;
144 break;
145 default:
146 pr_warn("%s: regulator_suspend_mode : 0x%x not supported\n",
147 rdev->desc->name, mode);
148 return -EINVAL;
149 }
150
151 ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
152 rdev->desc->enable_mask, val);
153 if (ret)
154 return ret;
155
156 max77686->opmode[rdev_get_id(rdev)] = val;
157 return 0;
158}
159
160static int max77686_enable(struct regulator_dev *rdev)
161{
162 struct max77686_data *max77686 = rdev_get_drvdata(rdev);
163
164 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
165 rdev->desc->enable_mask,
166 max77686->opmode[rdev_get_id(rdev)]);
167}
168
169static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
170{
171 unsigned int ramp_value = RAMP_RATE_NO_CTRL;
172
173 switch (ramp_delay) {
174 case 1 ... 13750:
175 ramp_value = RAMP_RATE_13P75MV;
176 break;
177 case 13751 ... 27500:
178 ramp_value = RAMP_RATE_27P5MV;
179 break;
180 case 27501 ... 55000:
181 ramp_value = RAMP_RATE_55MV;
182 break;
183 case 55001 ... 100000:
184 break;
185 default:
186 pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
187 rdev->desc->name, ramp_delay);
188 }
189
190 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
191 MAX77686_RAMP_RATE_MASK, ramp_value << 6);
192}
193
194static struct regulator_ops max77686_ops = {
195 .list_voltage = regulator_list_voltage_linear,
196 .map_voltage = regulator_map_voltage_linear,
197 .is_enabled = regulator_is_enabled_regmap,
198 .enable = max77686_enable,
199 .disable = regulator_disable_regmap,
200 .get_voltage_sel = regulator_get_voltage_sel_regmap,
201 .set_voltage_sel = regulator_set_voltage_sel_regmap,
202 .set_voltage_time_sel = regulator_set_voltage_time_sel,
203 .set_suspend_mode = max77686_set_suspend_mode,
204};
205
206static struct regulator_ops max77686_ldo_ops = {
207 .list_voltage = regulator_list_voltage_linear,
208 .map_voltage = regulator_map_voltage_linear,
209 .is_enabled = regulator_is_enabled_regmap,
210 .enable = max77686_enable,
211 .disable = regulator_disable_regmap,
212 .get_voltage_sel = regulator_get_voltage_sel_regmap,
213 .set_voltage_sel = regulator_set_voltage_sel_regmap,
214 .set_voltage_time_sel = regulator_set_voltage_time_sel,
215 .set_suspend_mode = max77686_ldo_set_suspend_mode,
216};
217
218static struct regulator_ops max77686_buck1_ops = {
219 .list_voltage = regulator_list_voltage_linear,
220 .map_voltage = regulator_map_voltage_linear,
221 .is_enabled = regulator_is_enabled_regmap,
222 .enable = max77686_enable,
223 .disable = regulator_disable_regmap,
224 .get_voltage_sel = regulator_get_voltage_sel_regmap,
225 .set_voltage_sel = regulator_set_voltage_sel_regmap,
226 .set_voltage_time_sel = regulator_set_voltage_time_sel,
227 .set_suspend_disable = max77686_buck_set_suspend_disable,
228};
229
230static struct regulator_ops max77686_buck_dvs_ops = {
231 .list_voltage = regulator_list_voltage_linear,
232 .map_voltage = regulator_map_voltage_linear,
233 .is_enabled = regulator_is_enabled_regmap,
234 .enable = max77686_enable,
235 .disable = regulator_disable_regmap,
236 .get_voltage_sel = regulator_get_voltage_sel_regmap,
237 .set_voltage_sel = regulator_set_voltage_sel_regmap,
238 .set_voltage_time_sel = regulator_set_voltage_time_sel,
239 .set_ramp_delay = max77686_set_ramp_delay,
240 .set_suspend_disable = max77686_buck_set_suspend_disable,
241};
242
243#define regulator_desc_ldo(num) { \
244 .name = "LDO"#num, \
245 .id = MAX77686_LDO##num, \
246 .ops = &max77686_ops, \
247 .type = REGULATOR_VOLTAGE, \
248 .owner = THIS_MODULE, \
249 .min_uV = MAX77686_LDO_MINUV, \
250 .uV_step = MAX77686_LDO_UVSTEP, \
251 .ramp_delay = MAX77686_RAMP_DELAY, \
252 .n_voltages = MAX77686_VSEL_MASK + 1, \
253 .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
254 .vsel_mask = MAX77686_VSEL_MASK, \
255 .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
256 .enable_mask = MAX77686_OPMODE_MASK \
257 << MAX77686_OPMODE_SHIFT, \
258}
259#define regulator_desc_lpm_ldo(num) { \
260 .name = "LDO"#num, \
261 .id = MAX77686_LDO##num, \
262 .ops = &max77686_ldo_ops, \
263 .type = REGULATOR_VOLTAGE, \
264 .owner = THIS_MODULE, \
265 .min_uV = MAX77686_LDO_MINUV, \
266 .uV_step = MAX77686_LDO_UVSTEP, \
267 .ramp_delay = MAX77686_RAMP_DELAY, \
268 .n_voltages = MAX77686_VSEL_MASK + 1, \
269 .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
270 .vsel_mask = MAX77686_VSEL_MASK, \
271 .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
272 .enable_mask = MAX77686_OPMODE_MASK \
273 << MAX77686_OPMODE_SHIFT, \
274}
275#define regulator_desc_ldo_low(num) { \
276 .name = "LDO"#num, \
277 .id = MAX77686_LDO##num, \
278 .ops = &max77686_ldo_ops, \
279 .type = REGULATOR_VOLTAGE, \
280 .owner = THIS_MODULE, \
281 .min_uV = MAX77686_LDO_LOW_MINUV, \
282 .uV_step = MAX77686_LDO_LOW_UVSTEP, \
283 .ramp_delay = MAX77686_RAMP_DELAY, \
284 .n_voltages = MAX77686_VSEL_MASK + 1, \
285 .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
286 .vsel_mask = MAX77686_VSEL_MASK, \
287 .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
288 .enable_mask = MAX77686_OPMODE_MASK \
289 << MAX77686_OPMODE_SHIFT, \
290}
291#define regulator_desc_ldo1_low(num) { \
292 .name = "LDO"#num, \
293 .id = MAX77686_LDO##num, \
294 .ops = &max77686_ops, \
295 .type = REGULATOR_VOLTAGE, \
296 .owner = THIS_MODULE, \
297 .min_uV = MAX77686_LDO_LOW_MINUV, \
298 .uV_step = MAX77686_LDO_LOW_UVSTEP, \
299 .ramp_delay = MAX77686_RAMP_DELAY, \
300 .n_voltages = MAX77686_VSEL_MASK + 1, \
301 .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
302 .vsel_mask = MAX77686_VSEL_MASK, \
303 .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
304 .enable_mask = MAX77686_OPMODE_MASK \
305 << MAX77686_OPMODE_SHIFT, \
306}
307#define regulator_desc_buck(num) { \
308 .name = "BUCK"#num, \
309 .id = MAX77686_BUCK##num, \
310 .ops = &max77686_ops, \
311 .type = REGULATOR_VOLTAGE, \
312 .owner = THIS_MODULE, \
313 .min_uV = MAX77686_BUCK_MINUV, \
314 .uV_step = MAX77686_BUCK_UVSTEP, \
315 .ramp_delay = MAX77686_RAMP_DELAY, \
316 .n_voltages = MAX77686_VSEL_MASK + 1, \
317 .vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \
318 .vsel_mask = MAX77686_VSEL_MASK, \
319 .enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \
320 .enable_mask = MAX77686_OPMODE_MASK, \
321}
322#define regulator_desc_buck1(num) { \
323 .name = "BUCK"#num, \
324 .id = MAX77686_BUCK##num, \
325 .ops = &max77686_buck1_ops, \
326 .type = REGULATOR_VOLTAGE, \
327 .owner = THIS_MODULE, \
328 .min_uV = MAX77686_BUCK_MINUV, \
329 .uV_step = MAX77686_BUCK_UVSTEP, \
330 .ramp_delay = MAX77686_RAMP_DELAY, \
331 .n_voltages = MAX77686_VSEL_MASK + 1, \
332 .vsel_reg = MAX77686_REG_BUCK1OUT, \
333 .vsel_mask = MAX77686_VSEL_MASK, \
334 .enable_reg = MAX77686_REG_BUCK1CTRL, \
335 .enable_mask = MAX77686_OPMODE_MASK, \
336}
337#define regulator_desc_buck_dvs(num) { \
338 .name = "BUCK"#num, \
339 .id = MAX77686_BUCK##num, \
340 .ops = &max77686_buck_dvs_ops, \
341 .type = REGULATOR_VOLTAGE, \
342 .owner = THIS_MODULE, \
343 .min_uV = MAX77686_DVS_MINUV, \
344 .uV_step = MAX77686_DVS_UVSTEP, \
345 .ramp_delay = MAX77686_DVS_RAMP_DELAY, \
346 .n_voltages = MAX77686_DVS_VSEL_MASK + 1, \
347 .vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \
348 .vsel_mask = MAX77686_DVS_VSEL_MASK, \
349 .enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \
350 .enable_mask = MAX77686_OPMODE_MASK \
351 << MAX77686_OPMODE_BUCK234_SHIFT, \
352}
353
354static struct regulator_desc regulators[] = {
355 regulator_desc_ldo1_low(1),
356 regulator_desc_ldo_low(2),
357 regulator_desc_ldo(3),
358 regulator_desc_ldo(4),
359 regulator_desc_ldo(5),
360 regulator_desc_ldo_low(6),
361 regulator_desc_ldo_low(7),
362 regulator_desc_ldo_low(8),
363 regulator_desc_ldo(9),
364 regulator_desc_lpm_ldo(10),
365 regulator_desc_lpm_ldo(11),
366 regulator_desc_lpm_ldo(12),
367 regulator_desc_ldo(13),
368 regulator_desc_lpm_ldo(14),
369 regulator_desc_ldo_low(15),
370 regulator_desc_lpm_ldo(16),
371 regulator_desc_ldo(17),
372 regulator_desc_ldo(18),
373 regulator_desc_ldo(19),
374 regulator_desc_ldo(20),
375 regulator_desc_ldo(21),
376 regulator_desc_ldo(22),
377 regulator_desc_ldo(23),
378 regulator_desc_ldo(24),
379 regulator_desc_ldo(25),
380 regulator_desc_ldo(26),
381 regulator_desc_buck1(1),
382 regulator_desc_buck_dvs(2),
383 regulator_desc_buck_dvs(3),
384 regulator_desc_buck_dvs(4),
385 regulator_desc_buck(5),
386 regulator_desc_buck(6),
387 regulator_desc_buck(7),
388 regulator_desc_buck(8),
389 regulator_desc_buck(9),
390};
391
392#ifdef CONFIG_OF
393static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
394 struct max77686_platform_data *pdata)
395{
396 struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
397 struct device_node *pmic_np, *regulators_np;
398 struct max77686_regulator_data *rdata;
399 struct of_regulator_match rmatch;
400 unsigned int i;
401
402 pmic_np = iodev->dev->of_node;
403 regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators");
404 if (!regulators_np) {
405 dev_err(&pdev->dev, "could not find regulators sub-node\n");
406 return -EINVAL;
407 }
408
409 pdata->num_regulators = ARRAY_SIZE(regulators);
410 rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) *
411 pdata->num_regulators, GFP_KERNEL);
412 if (!rdata) {
413 dev_err(&pdev->dev,
414 "could not allocate memory for regulator data\n");
415 return -ENOMEM;
416 }
417
418 for (i = 0; i < pdata->num_regulators; i++) {
419 rmatch.name = regulators[i].name;
420 rmatch.init_data = NULL;
421 rmatch.of_node = NULL;
422 of_regulator_match(&pdev->dev, regulators_np, &rmatch, 1);
423 rdata[i].initdata = rmatch.init_data;
424 rdata[i].of_node = rmatch.of_node;
425 }
426
427 pdata->regulators = rdata;
428
429 return 0;
430}
431#else
432static int max77686_pmic_dt_parse_pdata(struct platform_device *pdev,
433 struct max77686_platform_data *pdata)
434{
435 return 0;
436}
437#endif /* CONFIG_OF */
438
439static int max77686_pmic_probe(struct platform_device *pdev)
440{
441 struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
442 struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
443 struct max77686_data *max77686;
444 int i, ret = 0;
445 struct regulator_config config = { };
446
447 dev_dbg(&pdev->dev, "%s\n", __func__);
448
449 if (!pdata) {
450 dev_err(&pdev->dev, "no platform data found for regulator\n");
451 return -ENODEV;
452 }
453
454 if (iodev->dev->of_node) {
455 ret = max77686_pmic_dt_parse_pdata(pdev, pdata);
456 if (ret)
457 return ret;
458 }
459
460 if (pdata->num_regulators != MAX77686_REGULATORS) {
461 dev_err(&pdev->dev,
462 "Invalid initial data for regulator's initialiation\n");
463 return -EINVAL;
464 }
465
466 max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
467 GFP_KERNEL);
468 if (!max77686)
469 return -ENOMEM;
470
471 config.dev = &pdev->dev;
472 config.regmap = iodev->regmap;
473 config.driver_data = max77686;
474 platform_set_drvdata(pdev, max77686);
475
476 for (i = 0; i < MAX77686_REGULATORS; i++) {
477 config.init_data = pdata->regulators[i].initdata;
478 config.of_node = pdata->regulators[i].of_node;
479
480 max77686->opmode[i] = regulators[i].enable_mask;
481 max77686->rdev[i] = regulator_register(®ulators[i], &config);
482 if (IS_ERR(max77686->rdev[i])) {
483 ret = PTR_ERR(max77686->rdev[i]);
484 dev_err(&pdev->dev,
485 "regulator init failed for %d\n", i);
486 max77686->rdev[i] = NULL;
487 goto err;
488 }
489 }
490
491 return 0;
492err:
493 while (--i >= 0)
494 regulator_unregister(max77686->rdev[i]);
495 return ret;
496}
497
498static int max77686_pmic_remove(struct platform_device *pdev)
499{
500 struct max77686_data *max77686 = platform_get_drvdata(pdev);
501 int i;
502
503 for (i = 0; i < MAX77686_REGULATORS; i++)
504 regulator_unregister(max77686->rdev[i]);
505
506 return 0;
507}
508
509static const struct platform_device_id max77686_pmic_id[] = {
510 {"max77686-pmic", 0},
511 { },
512};
513MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
514
515static struct platform_driver max77686_pmic_driver = {
516 .driver = {
517 .name = "max77686-pmic",
518 .owner = THIS_MODULE,
519 },
520 .probe = max77686_pmic_probe,
521 .remove = max77686_pmic_remove,
522 .id_table = max77686_pmic_id,
523};
524
525static int __init max77686_pmic_init(void)
526{
527 return platform_driver_register(&max77686_pmic_driver);
528}
529subsys_initcall(max77686_pmic_init);
530
531static void __exit max77686_pmic_cleanup(void)
532{
533 platform_driver_unregister(&max77686_pmic_driver);
534}
535module_exit(max77686_pmic_cleanup);
536
537MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
538MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
539MODULE_LICENSE("GPL");