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Linus Walleijd619bc12009-09-09 11:31:00 +02001/*
2 * drivers/regulator/ab3100.c
3 *
4 * Copyright (C) 2008-2009 ST-Ericsson AB
5 * License terms: GNU General Public License (GPL) version 2
6 * Low-level control of the AB3100 IC Low Dropout (LDO)
7 * regulators, external regulator and buck converter
8 * Author: Mattias Wallin <mattias.wallin@stericsson.com>
9 * Author: Linus Walleij <linus.walleij@stericsson.com>
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/err.h>
Linus Walleijd619bc12009-09-09 11:31:00 +020016#include <linux/platform_device.h>
17#include <linux/regulator/driver.h>
Marcus Cooper0fd00132012-08-10 10:32:35 +020018#include <linux/mfd/ab3100.h>
Linus Walleij812f9e92010-05-01 18:26:07 +020019#include <linux/mfd/abx500.h>
Linus Walleij8735bc22013-04-22 11:57:25 +020020#include <linux/of.h>
21#include <linux/regulator/of_regulator.h>
Linus Walleijd619bc12009-09-09 11:31:00 +020022
23/* LDO registers and some handy masking definitions for AB3100 */
24#define AB3100_LDO_A 0x40
25#define AB3100_LDO_C 0x41
26#define AB3100_LDO_D 0x42
27#define AB3100_LDO_E 0x43
28#define AB3100_LDO_E_SLEEP 0x44
29#define AB3100_LDO_F 0x45
30#define AB3100_LDO_G 0x46
31#define AB3100_LDO_H 0x47
32#define AB3100_LDO_H_SLEEP_MODE 0
33#define AB3100_LDO_H_SLEEP_EN 2
34#define AB3100_LDO_ON 4
35#define AB3100_LDO_H_VSEL_AC 5
36#define AB3100_LDO_K 0x48
37#define AB3100_LDO_EXT 0x49
38#define AB3100_BUCK 0x4A
39#define AB3100_BUCK_SLEEP 0x4B
40#define AB3100_REG_ON_MASK 0x10
41
42/**
43 * struct ab3100_regulator
44 * A struct passed around the individual regulator functions
45 * @platform_device: platform device holding this regulator
Mattias Wallinfa661252010-05-01 18:26:20 +020046 * @dev: handle to the device
Linus Walleijd619bc12009-09-09 11:31:00 +020047 * @plfdata: AB3100 platform data passed in at probe time
48 * @regreg: regulator register number in the AB3100
Linus Walleijd619bc12009-09-09 11:31:00 +020049 */
50struct ab3100_regulator {
51 struct regulator_dev *rdev;
Mattias Wallinfa661252010-05-01 18:26:20 +020052 struct device *dev;
Linus Walleijd619bc12009-09-09 11:31:00 +020053 struct ab3100_platform_data *plfdata;
54 u8 regreg;
Linus Walleijd619bc12009-09-09 11:31:00 +020055};
56
57/* The order in which registers are initialized */
58static const u8 ab3100_reg_init_order[AB3100_NUM_REGULATORS+2] = {
59 AB3100_LDO_A,
60 AB3100_LDO_C,
61 AB3100_LDO_E,
62 AB3100_LDO_E_SLEEP,
63 AB3100_LDO_F,
64 AB3100_LDO_G,
65 AB3100_LDO_H,
66 AB3100_LDO_K,
67 AB3100_LDO_EXT,
68 AB3100_BUCK,
69 AB3100_BUCK_SLEEP,
70 AB3100_LDO_D,
71};
72
73/* Preset (hardware defined) voltages for these regulators */
74#define LDO_A_VOLTAGE 2750000
75#define LDO_C_VOLTAGE 2650000
76#define LDO_D_VOLTAGE 2650000
77
Axel Lina3beb742012-05-20 10:31:58 +080078static const unsigned int ldo_e_buck_typ_voltages[] = {
Linus Walleijd619bc12009-09-09 11:31:00 +020079 1800000,
80 1400000,
81 1300000,
82 1200000,
83 1100000,
84 1050000,
85 900000,
86};
87
Axel Lina3beb742012-05-20 10:31:58 +080088static const unsigned int ldo_f_typ_voltages[] = {
Linus Walleijd619bc12009-09-09 11:31:00 +020089 1800000,
90 1400000,
91 1300000,
92 1200000,
93 1100000,
94 1050000,
95 2500000,
96 2650000,
97};
98
Axel Lina3beb742012-05-20 10:31:58 +080099static const unsigned int ldo_g_typ_voltages[] = {
Linus Walleijd619bc12009-09-09 11:31:00 +0200100 2850000,
101 2750000,
102 1800000,
103 1500000,
104};
105
Axel Lina3beb742012-05-20 10:31:58 +0800106static const unsigned int ldo_h_typ_voltages[] = {
Linus Walleijd619bc12009-09-09 11:31:00 +0200107 2750000,
108 1800000,
109 1500000,
110 1200000,
111};
112
Axel Lina3beb742012-05-20 10:31:58 +0800113static const unsigned int ldo_k_typ_voltages[] = {
Linus Walleijd619bc12009-09-09 11:31:00 +0200114 2750000,
115 1800000,
116};
117
118
119/* The regulator devices */
120static struct ab3100_regulator
121ab3100_regulators[AB3100_NUM_REGULATORS] = {
122 {
123 .regreg = AB3100_LDO_A,
Linus Walleijd619bc12009-09-09 11:31:00 +0200124 },
125 {
126 .regreg = AB3100_LDO_C,
Linus Walleijd619bc12009-09-09 11:31:00 +0200127 },
128 {
129 .regreg = AB3100_LDO_D,
Linus Walleijd619bc12009-09-09 11:31:00 +0200130 },
131 {
132 .regreg = AB3100_LDO_E,
Linus Walleijd619bc12009-09-09 11:31:00 +0200133 },
134 {
135 .regreg = AB3100_LDO_F,
Linus Walleijd619bc12009-09-09 11:31:00 +0200136 },
137 {
138 .regreg = AB3100_LDO_G,
Linus Walleijd619bc12009-09-09 11:31:00 +0200139 },
140 {
141 .regreg = AB3100_LDO_H,
Linus Walleijd619bc12009-09-09 11:31:00 +0200142 },
143 {
144 .regreg = AB3100_LDO_K,
Linus Walleijd619bc12009-09-09 11:31:00 +0200145 },
146 {
147 .regreg = AB3100_LDO_EXT,
148 /* No voltages for the external regulator */
149 },
150 {
151 .regreg = AB3100_BUCK,
Linus Walleijd619bc12009-09-09 11:31:00 +0200152 },
153};
154
155/*
156 * General functions for enable, disable and is_enabled used for
157 * LDO: A,C,E,F,G,H,K,EXT and BUCK
158 */
159static int ab3100_enable_regulator(struct regulator_dev *reg)
160{
Axel Lin6c3b9562012-07-05 09:38:15 +0800161 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
Linus Walleijd619bc12009-09-09 11:31:00 +0200162 int err;
163 u8 regval;
164
Mattias Wallinfa661252010-05-01 18:26:20 +0200165 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
Linus Walleijd619bc12009-09-09 11:31:00 +0200166 &regval);
167 if (err) {
168 dev_warn(&reg->dev, "failed to get regid %d value\n",
169 abreg->regreg);
170 return err;
171 }
172
173 /* The regulator is already on, no reason to go further */
174 if (regval & AB3100_REG_ON_MASK)
175 return 0;
176
177 regval |= AB3100_REG_ON_MASK;
178
Mattias Wallinfa661252010-05-01 18:26:20 +0200179 err = abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
Linus Walleijd619bc12009-09-09 11:31:00 +0200180 regval);
181 if (err) {
182 dev_warn(&reg->dev, "failed to set regid %d value\n",
183 abreg->regreg);
184 return err;
185 }
186
Linus Walleijd619bc12009-09-09 11:31:00 +0200187 return 0;
188}
189
190static int ab3100_disable_regulator(struct regulator_dev *reg)
191{
Axel Lin6c3b9562012-07-05 09:38:15 +0800192 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
Linus Walleijd619bc12009-09-09 11:31:00 +0200193 int err;
194 u8 regval;
195
196 /*
197 * LDO D is a special regulator. When it is disabled, the entire
198 * system is shut down. So this is handled specially.
199 */
Linus Walleij176f45b2009-10-28 17:30:15 +0100200 pr_info("Called ab3100_disable_regulator\n");
Linus Walleijd619bc12009-09-09 11:31:00 +0200201 if (abreg->regreg == AB3100_LDO_D) {
Linus Walleijd619bc12009-09-09 11:31:00 +0200202 dev_info(&reg->dev, "disabling LDO D - shut down system\n");
Linus Walleijd619bc12009-09-09 11:31:00 +0200203 /* Setting LDO D to 0x00 cuts the power to the SoC */
Mattias Wallinfa661252010-05-01 18:26:20 +0200204 return abx500_set_register_interruptible(abreg->dev, 0,
Linus Walleijd619bc12009-09-09 11:31:00 +0200205 AB3100_LDO_D, 0x00U);
Linus Walleijd619bc12009-09-09 11:31:00 +0200206 }
207
208 /*
209 * All other regulators are handled here
210 */
Mattias Wallinfa661252010-05-01 18:26:20 +0200211 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
Linus Walleijd619bc12009-09-09 11:31:00 +0200212 &regval);
213 if (err) {
214 dev_err(&reg->dev, "unable to get register 0x%x\n",
215 abreg->regreg);
216 return err;
217 }
218 regval &= ~AB3100_REG_ON_MASK;
Mattias Wallinfa661252010-05-01 18:26:20 +0200219 return abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
Linus Walleijd619bc12009-09-09 11:31:00 +0200220 regval);
221}
222
223static int ab3100_is_enabled_regulator(struct regulator_dev *reg)
224{
Axel Lin6c3b9562012-07-05 09:38:15 +0800225 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
Linus Walleijd619bc12009-09-09 11:31:00 +0200226 u8 regval;
227 int err;
228
Mattias Wallinfa661252010-05-01 18:26:20 +0200229 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
Linus Walleijd619bc12009-09-09 11:31:00 +0200230 &regval);
231 if (err) {
232 dev_err(&reg->dev, "unable to get register 0x%x\n",
233 abreg->regreg);
234 return err;
235 }
236
237 return regval & AB3100_REG_ON_MASK;
238}
239
Linus Walleijd619bc12009-09-09 11:31:00 +0200240static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
241{
Axel Lin6c3b9562012-07-05 09:38:15 +0800242 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
Linus Walleijd619bc12009-09-09 11:31:00 +0200243 u8 regval;
244 int err;
245
Linus Walleijd619bc12009-09-09 11:31:00 +0200246 /*
247 * For variable types, read out setting and index into
248 * supplied voltage list.
249 */
Mattias Wallinfa661252010-05-01 18:26:20 +0200250 err = abx500_get_register_interruptible(abreg->dev, 0,
Linus Walleijd619bc12009-09-09 11:31:00 +0200251 abreg->regreg, &regval);
252 if (err) {
253 dev_warn(&reg->dev,
254 "failed to get regulator value in register %02x\n",
255 abreg->regreg);
256 return err;
257 }
258
259 /* The 3 highest bits index voltages */
260 regval &= 0xE0;
261 regval >>= 5;
262
Axel Lina3beb742012-05-20 10:31:58 +0800263 if (regval >= reg->desc->n_voltages) {
Linus Walleijd619bc12009-09-09 11:31:00 +0200264 dev_err(&reg->dev,
265 "regulator register %02x contains an illegal voltage setting\n",
266 abreg->regreg);
267 return -EINVAL;
268 }
269
Axel Lina3beb742012-05-20 10:31:58 +0800270 return reg->desc->volt_table[regval];
Linus Walleijd619bc12009-09-09 11:31:00 +0200271}
272
Axel Lin1f793ff2012-03-20 10:14:40 +0800273static int ab3100_set_voltage_regulator_sel(struct regulator_dev *reg,
274 unsigned selector)
Linus Walleijd619bc12009-09-09 11:31:00 +0200275{
Axel Lin6c3b9562012-07-05 09:38:15 +0800276 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
Linus Walleijd619bc12009-09-09 11:31:00 +0200277 u8 regval;
278 int err;
Mark Brown3a93f2a2010-11-10 14:38:29 +0000279
Mattias Wallinfa661252010-05-01 18:26:20 +0200280 err = abx500_get_register_interruptible(abreg->dev, 0,
Linus Walleijd619bc12009-09-09 11:31:00 +0200281 abreg->regreg, &regval);
282 if (err) {
283 dev_warn(&reg->dev,
284 "failed to get regulator register %02x\n",
285 abreg->regreg);
286 return err;
287 }
288
289 /* The highest three bits control the variable regulators */
290 regval &= ~0xE0;
Axel Lin1f793ff2012-03-20 10:14:40 +0800291 regval |= (selector << 5);
Linus Walleijd619bc12009-09-09 11:31:00 +0200292
Mattias Wallinfa661252010-05-01 18:26:20 +0200293 err = abx500_set_register_interruptible(abreg->dev, 0,
Linus Walleijd619bc12009-09-09 11:31:00 +0200294 abreg->regreg, regval);
295 if (err)
296 dev_warn(&reg->dev, "failed to set regulator register %02x\n",
297 abreg->regreg);
298
299 return err;
300}
301
302static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg,
303 int uV)
304{
Axel Lin6c3b9562012-07-05 09:38:15 +0800305 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
Linus Walleijd619bc12009-09-09 11:31:00 +0200306 u8 regval;
307 int err;
308 int bestindex;
309 u8 targetreg;
310
311 if (abreg->regreg == AB3100_LDO_E)
312 targetreg = AB3100_LDO_E_SLEEP;
313 else if (abreg->regreg == AB3100_BUCK)
314 targetreg = AB3100_BUCK_SLEEP;
315 else
316 return -EINVAL;
317
318 /* LDO E and BUCK have special suspend voltages you can set */
Axel Linb13296d2012-05-17 13:06:18 +0800319 bestindex = regulator_map_voltage_iterate(reg, uV, uV);
Linus Walleijd619bc12009-09-09 11:31:00 +0200320
Mattias Wallinfa661252010-05-01 18:26:20 +0200321 err = abx500_get_register_interruptible(abreg->dev, 0,
Linus Walleijd619bc12009-09-09 11:31:00 +0200322 targetreg, &regval);
323 if (err) {
324 dev_warn(&reg->dev,
325 "failed to get regulator register %02x\n",
326 targetreg);
327 return err;
328 }
329
330 /* The highest three bits control the variable regulators */
331 regval &= ~0xE0;
332 regval |= (bestindex << 5);
333
Mattias Wallinfa661252010-05-01 18:26:20 +0200334 err = abx500_set_register_interruptible(abreg->dev, 0,
Linus Walleijd619bc12009-09-09 11:31:00 +0200335 targetreg, regval);
336 if (err)
337 dev_warn(&reg->dev, "failed to set regulator register %02x\n",
338 abreg->regreg);
339
340 return err;
341}
342
343/*
344 * The external regulator can just define a fixed voltage.
345 */
346static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg)
347{
Axel Lin6c3b9562012-07-05 09:38:15 +0800348 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
Linus Walleijd619bc12009-09-09 11:31:00 +0200349
Linus Walleij8735bc22013-04-22 11:57:25 +0200350 if (abreg->plfdata)
351 return abreg->plfdata->external_voltage;
352 else
353 /* TODO: encode external voltage into device tree */
354 return 0;
Linus Walleijd619bc12009-09-09 11:31:00 +0200355}
356
357static struct regulator_ops regulator_ops_fixed = {
Axel Lin1bd19552012-06-11 10:14:28 +0800358 .list_voltage = regulator_list_voltage_linear,
Linus Walleijd619bc12009-09-09 11:31:00 +0200359 .enable = ab3100_enable_regulator,
360 .disable = ab3100_disable_regulator,
361 .is_enabled = ab3100_is_enabled_regulator,
Linus Walleijd619bc12009-09-09 11:31:00 +0200362};
363
364static struct regulator_ops regulator_ops_variable = {
365 .enable = ab3100_enable_regulator,
366 .disable = ab3100_disable_regulator,
367 .is_enabled = ab3100_is_enabled_regulator,
368 .get_voltage = ab3100_get_voltage_regulator,
Axel Lin1f793ff2012-03-20 10:14:40 +0800369 .set_voltage_sel = ab3100_set_voltage_regulator_sel,
Axel Lina3beb742012-05-20 10:31:58 +0800370 .list_voltage = regulator_list_voltage_table,
Linus Walleijd619bc12009-09-09 11:31:00 +0200371};
372
373static struct regulator_ops regulator_ops_variable_sleepable = {
374 .enable = ab3100_enable_regulator,
375 .disable = ab3100_disable_regulator,
376 .is_enabled = ab3100_is_enabled_regulator,
377 .get_voltage = ab3100_get_voltage_regulator,
Axel Lin1f793ff2012-03-20 10:14:40 +0800378 .set_voltage_sel = ab3100_set_voltage_regulator_sel,
Linus Walleijd619bc12009-09-09 11:31:00 +0200379 .set_suspend_voltage = ab3100_set_suspend_voltage_regulator,
Axel Lina3beb742012-05-20 10:31:58 +0800380 .list_voltage = regulator_list_voltage_table,
Linus Walleijd619bc12009-09-09 11:31:00 +0200381};
382
383/*
384 * LDO EXT is an external regulator so it is really
385 * not possible to set any voltage locally here, AB3100
386 * is an on/off switch plain an simple. The external
387 * voltage is defined in the board set-up if any.
388 */
389static struct regulator_ops regulator_ops_external = {
390 .enable = ab3100_enable_regulator,
391 .disable = ab3100_disable_regulator,
392 .is_enabled = ab3100_is_enabled_regulator,
393 .get_voltage = ab3100_get_voltage_regulator_external,
394};
395
396static struct regulator_desc
397ab3100_regulator_desc[AB3100_NUM_REGULATORS] = {
398 {
399 .name = "LDO_A",
400 .id = AB3100_LDO_A,
401 .ops = &regulator_ops_fixed,
Axel Lin1bd19552012-06-11 10:14:28 +0800402 .n_voltages = 1,
Linus Walleijd619bc12009-09-09 11:31:00 +0200403 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800404 .owner = THIS_MODULE,
Axel Lin1bd19552012-06-11 10:14:28 +0800405 .min_uV = LDO_A_VOLTAGE,
Axel Linf8568cb2012-07-04 10:03:23 +0800406 .enable_time = 200,
Linus Walleijd619bc12009-09-09 11:31:00 +0200407 },
408 {
409 .name = "LDO_C",
410 .id = AB3100_LDO_C,
411 .ops = &regulator_ops_fixed,
Axel Lin1bd19552012-06-11 10:14:28 +0800412 .n_voltages = 1,
Linus Walleijd619bc12009-09-09 11:31:00 +0200413 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800414 .owner = THIS_MODULE,
Axel Lin1bd19552012-06-11 10:14:28 +0800415 .min_uV = LDO_C_VOLTAGE,
Axel Linf8568cb2012-07-04 10:03:23 +0800416 .enable_time = 200,
Linus Walleijd619bc12009-09-09 11:31:00 +0200417 },
418 {
419 .name = "LDO_D",
420 .id = AB3100_LDO_D,
421 .ops = &regulator_ops_fixed,
Axel Lin1bd19552012-06-11 10:14:28 +0800422 .n_voltages = 1,
Linus Walleijd619bc12009-09-09 11:31:00 +0200423 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800424 .owner = THIS_MODULE,
Axel Lin1bd19552012-06-11 10:14:28 +0800425 .min_uV = LDO_D_VOLTAGE,
Axel Linf8568cb2012-07-04 10:03:23 +0800426 .enable_time = 200,
Linus Walleijd619bc12009-09-09 11:31:00 +0200427 },
428 {
429 .name = "LDO_E",
430 .id = AB3100_LDO_E,
431 .ops = &regulator_ops_variable_sleepable,
Linus Walleij75f2ba82009-09-17 09:17:33 +0200432 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
Axel Lina3beb742012-05-20 10:31:58 +0800433 .volt_table = ldo_e_buck_typ_voltages,
Linus Walleijd619bc12009-09-09 11:31:00 +0200434 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800435 .owner = THIS_MODULE,
Axel Linf8568cb2012-07-04 10:03:23 +0800436 .enable_time = 200,
Linus Walleijd619bc12009-09-09 11:31:00 +0200437 },
438 {
439 .name = "LDO_F",
440 .id = AB3100_LDO_F,
441 .ops = &regulator_ops_variable,
Linus Walleij75f2ba82009-09-17 09:17:33 +0200442 .n_voltages = ARRAY_SIZE(ldo_f_typ_voltages),
Axel Lina3beb742012-05-20 10:31:58 +0800443 .volt_table = ldo_f_typ_voltages,
Linus Walleijd619bc12009-09-09 11:31:00 +0200444 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800445 .owner = THIS_MODULE,
Axel Linf8568cb2012-07-04 10:03:23 +0800446 .enable_time = 600,
Linus Walleijd619bc12009-09-09 11:31:00 +0200447 },
448 {
449 .name = "LDO_G",
450 .id = AB3100_LDO_G,
451 .ops = &regulator_ops_variable,
Linus Walleij75f2ba82009-09-17 09:17:33 +0200452 .n_voltages = ARRAY_SIZE(ldo_g_typ_voltages),
Axel Lina3beb742012-05-20 10:31:58 +0800453 .volt_table = ldo_g_typ_voltages,
Linus Walleijd619bc12009-09-09 11:31:00 +0200454 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800455 .owner = THIS_MODULE,
Axel Linf8568cb2012-07-04 10:03:23 +0800456 .enable_time = 400,
Linus Walleijd619bc12009-09-09 11:31:00 +0200457 },
458 {
459 .name = "LDO_H",
460 .id = AB3100_LDO_H,
461 .ops = &regulator_ops_variable,
Linus Walleij75f2ba82009-09-17 09:17:33 +0200462 .n_voltages = ARRAY_SIZE(ldo_h_typ_voltages),
Axel Lina3beb742012-05-20 10:31:58 +0800463 .volt_table = ldo_h_typ_voltages,
Linus Walleijd619bc12009-09-09 11:31:00 +0200464 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800465 .owner = THIS_MODULE,
Axel Linf8568cb2012-07-04 10:03:23 +0800466 .enable_time = 200,
Linus Walleijd619bc12009-09-09 11:31:00 +0200467 },
468 {
469 .name = "LDO_K",
470 .id = AB3100_LDO_K,
471 .ops = &regulator_ops_variable,
Linus Walleij75f2ba82009-09-17 09:17:33 +0200472 .n_voltages = ARRAY_SIZE(ldo_k_typ_voltages),
Axel Lina3beb742012-05-20 10:31:58 +0800473 .volt_table = ldo_k_typ_voltages,
Linus Walleijd619bc12009-09-09 11:31:00 +0200474 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800475 .owner = THIS_MODULE,
Axel Linf8568cb2012-07-04 10:03:23 +0800476 .enable_time = 200,
Linus Walleijd619bc12009-09-09 11:31:00 +0200477 },
478 {
479 .name = "LDO_EXT",
480 .id = AB3100_LDO_EXT,
481 .ops = &regulator_ops_external,
482 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800483 .owner = THIS_MODULE,
Linus Walleijd619bc12009-09-09 11:31:00 +0200484 },
485 {
486 .name = "BUCK",
487 .id = AB3100_BUCK,
488 .ops = &regulator_ops_variable_sleepable,
Linus Walleij75f2ba82009-09-17 09:17:33 +0200489 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
Linus Walleijcfa9cfb2012-08-06 17:11:40 +0200490 .volt_table = ldo_e_buck_typ_voltages,
Linus Walleijd619bc12009-09-09 11:31:00 +0200491 .type = REGULATOR_VOLTAGE,
Axel Lin64714352010-05-13 17:33:01 +0800492 .owner = THIS_MODULE,
Axel Linf8568cb2012-07-04 10:03:23 +0800493 .enable_time = 1000,
Linus Walleijd619bc12009-09-09 11:31:00 +0200494 },
495};
496
Linus Walleij9b318352013-04-22 11:57:14 +0200497static int ab3100_regulator_register(struct platform_device *pdev,
498 struct ab3100_platform_data *plfdata,
Linus Walleij8735bc22013-04-22 11:57:25 +0200499 struct regulator_init_data *init_data,
500 struct device_node *np,
Linus Walleij9b318352013-04-22 11:57:14 +0200501 int id)
502{
503 struct regulator_desc *desc;
504 struct ab3100_regulator *reg;
505 struct regulator_dev *rdev;
506 struct regulator_config config = { };
507 int err, i;
508
509 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
510 desc = &ab3100_regulator_desc[i];
511 if (desc->id == id)
512 break;
513 }
514 if (desc->id != id)
515 return -ENODEV;
516
517 /* Same index used for this array */
518 reg = &ab3100_regulators[i];
519
520 /*
521 * Initialize per-regulator struct.
522 * Inherit platform data, this comes down from the
523 * i2c boarddata, from the machine. So if you want to
524 * see what it looks like for a certain machine, go
525 * into the machine I2C setup.
526 */
527 reg->dev = &pdev->dev;
528 if (plfdata) {
Linus Walleij9b318352013-04-22 11:57:14 +0200529 reg->plfdata = plfdata;
530 config.init_data = &plfdata->reg_constraints[i];
Linus Walleij8735bc22013-04-22 11:57:25 +0200531 } else if (np) {
532 config.of_node = np;
533 config.init_data = init_data;
Linus Walleij9b318352013-04-22 11:57:14 +0200534 }
535 config.dev = &pdev->dev;
536 config.driver_data = reg;
537
538 rdev = regulator_register(desc, &config);
539 if (IS_ERR(rdev)) {
540 err = PTR_ERR(rdev);
541 dev_err(&pdev->dev,
542 "%s: failed to register regulator %s err %d\n",
543 __func__, desc->name,
544 err);
545 return err;
546 }
547
548 /* Then set a pointer back to the registered regulator */
549 reg->rdev = rdev;
550 return 0;
551}
552
Linus Walleij8735bc22013-04-22 11:57:25 +0200553static struct of_regulator_match ab3100_regulator_matches[] = {
554 { .name = "ab3100_ldo_a", .driver_data = (void *) AB3100_LDO_A, },
555 { .name = "ab3100_ldo_c", .driver_data = (void *) AB3100_LDO_C, },
556 { .name = "ab3100_ldo_d", .driver_data = (void *) AB3100_LDO_D, },
557 { .name = "ab3100_ldo_e", .driver_data = (void *) AB3100_LDO_E, },
558 { .name = "ab3100_ldo_f", .driver_data = (void *) AB3100_LDO_F },
559 { .name = "ab3100_ldo_g", .driver_data = (void *) AB3100_LDO_G },
560 { .name = "ab3100_ldo_h", .driver_data = (void *) AB3100_LDO_H },
561 { .name = "ab3100_ldo_k", .driver_data = (void *) AB3100_LDO_K },
562 { .name = "ab3100_ext", .driver_data = (void *) AB3100_LDO_EXT },
563 { .name = "ab3100_buck", .driver_data = (void *) AB3100_BUCK },
564};
565
Linus Walleijd619bc12009-09-09 11:31:00 +0200566/*
Linus Walleij8735bc22013-04-22 11:57:25 +0200567 * Initial settings of ab3100 registers.
568 * Common for below LDO regulator settings are that
569 * bit 7-5 controls voltage. Bit 4 turns regulator ON(1) or OFF(0).
570 * Bit 3-2 controls sleep enable and bit 1-0 controls sleep mode.
Linus Walleijd619bc12009-09-09 11:31:00 +0200571 */
Linus Walleij8735bc22013-04-22 11:57:25 +0200572/* LDO_A 0x16: 2.75V, ON, SLEEP_A, SLEEP OFF GND */
573#define LDO_A_SETTING 0x16
574/* LDO_C 0x10: 2.65V, ON, SLEEP_A or B, SLEEP full power */
575#define LDO_C_SETTING 0x10
576/* LDO_D 0x10: 2.65V, ON, sleep mode not used */
577#define LDO_D_SETTING 0x10
578/* LDO_E 0x10: 1.8V, ON, SLEEP_A or B, SLEEP full power */
579#define LDO_E_SETTING 0x10
580/* LDO_E SLEEP 0x00: 1.8V, not used, SLEEP_A or B, not used */
581#define LDO_E_SLEEP_SETTING 0x00
582/* LDO_F 0xD0: 2.5V, ON, SLEEP_A or B, SLEEP full power */
583#define LDO_F_SETTING 0xD0
584/* LDO_G 0x00: 2.85V, OFF, SLEEP_A or B, SLEEP full power */
585#define LDO_G_SETTING 0x00
586/* LDO_H 0x18: 2.75V, ON, SLEEP_B, SLEEP full power */
587#define LDO_H_SETTING 0x18
588/* LDO_K 0x00: 2.75V, OFF, SLEEP_A or B, SLEEP full power */
589#define LDO_K_SETTING 0x00
590/* LDO_EXT 0x00: Voltage not set, OFF, not used, not used */
591#define LDO_EXT_SETTING 0x00
592/* BUCK 0x7D: 1.2V, ON, SLEEP_A and B, SLEEP low power */
593#define BUCK_SETTING 0x7D
594/* BUCK SLEEP 0xAC: 1.05V, Not used, SLEEP_A and B, Not used */
595#define BUCK_SLEEP_SETTING 0xAC
596
597static const u8 ab3100_reg_initvals[] = {
598 LDO_A_SETTING,
599 LDO_C_SETTING,
600 LDO_E_SETTING,
601 LDO_E_SLEEP_SETTING,
602 LDO_F_SETTING,
603 LDO_G_SETTING,
604 LDO_H_SETTING,
605 LDO_K_SETTING,
606 LDO_EXT_SETTING,
607 BUCK_SETTING,
608 BUCK_SLEEP_SETTING,
609 LDO_D_SETTING,
610};
611
Axel Lin018fd852013-04-26 21:57:09 +0800612static int ab3100_regulators_remove(struct platform_device *pdev)
613{
614 int i;
615
616 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
617 struct ab3100_regulator *reg = &ab3100_regulators[i];
618
619 regulator_unregister(reg->rdev);
620 reg->rdev = NULL;
621 }
622 return 0;
623}
624
Linus Walleij8735bc22013-04-22 11:57:25 +0200625static int
626ab3100_regulator_of_probe(struct platform_device *pdev, struct device_node *np)
627{
628 int err, i;
629
630 /*
631 * Set up the regulator registers, as was previously done with
632 * platform data.
633 */
634 /* Set up regulators */
635 for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
636 err = abx500_set_register_interruptible(&pdev->dev, 0,
637 ab3100_reg_init_order[i],
638 ab3100_reg_initvals[i]);
639 if (err) {
640 dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
641 err);
642 return err;
643 }
644 }
645
646 for (i = 0; i < ARRAY_SIZE(ab3100_regulator_matches); i++) {
647 err = ab3100_regulator_register(
648 pdev, NULL, ab3100_regulator_matches[i].init_data,
649 ab3100_regulator_matches[i].of_node,
650 (int) ab3100_regulator_matches[i].driver_data);
Axel Lin018fd852013-04-26 21:57:09 +0800651 if (err) {
652 ab3100_regulators_remove(pdev);
Linus Walleij8735bc22013-04-22 11:57:25 +0200653 return err;
Axel Lin018fd852013-04-26 21:57:09 +0800654 }
Linus Walleij8735bc22013-04-22 11:57:25 +0200655 }
656
657 return 0;
658}
659
Linus Walleijd619bc12009-09-09 11:31:00 +0200660
Bill Pembertona5023572012-11-19 13:22:22 -0500661static int ab3100_regulators_probe(struct platform_device *pdev)
Linus Walleijd619bc12009-09-09 11:31:00 +0200662{
Samuel Ortiza771e362011-04-06 00:41:43 +0200663 struct ab3100_platform_data *plfdata = pdev->dev.platform_data;
Linus Walleij8735bc22013-04-22 11:57:25 +0200664 struct device_node *np = pdev->dev.of_node;
Linus Walleijd619bc12009-09-09 11:31:00 +0200665 int err = 0;
666 u8 data;
667 int i;
668
669 /* Check chip state */
Mattias Wallinfa661252010-05-01 18:26:20 +0200670 err = abx500_get_register_interruptible(&pdev->dev, 0,
Linus Walleijd619bc12009-09-09 11:31:00 +0200671 AB3100_LDO_D, &data);
672 if (err) {
673 dev_err(&pdev->dev, "could not read initial status of LDO_D\n");
674 return err;
675 }
676 if (data & 0x10)
677 dev_notice(&pdev->dev,
678 "chip is already in active mode (Warm start)\n");
679 else
680 dev_notice(&pdev->dev,
681 "chip is in inactive mode (Cold start)\n");
682
Linus Walleij8735bc22013-04-22 11:57:25 +0200683 if (np) {
684 err = of_regulator_match(&pdev->dev, np,
685 ab3100_regulator_matches,
686 ARRAY_SIZE(ab3100_regulator_matches));
687 if (err < 0) {
688 dev_err(&pdev->dev,
689 "Error parsing regulator init data: %d\n", err);
690 return err;
691 }
692 return ab3100_regulator_of_probe(pdev, np);
693 }
694
Linus Walleijd619bc12009-09-09 11:31:00 +0200695 /* Set up regulators */
696 for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
Mattias Wallinfa661252010-05-01 18:26:20 +0200697 err = abx500_set_register_interruptible(&pdev->dev, 0,
Linus Walleijd619bc12009-09-09 11:31:00 +0200698 ab3100_reg_init_order[i],
699 plfdata->reg_initvals[i]);
700 if (err) {
701 dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
702 err);
703 return err;
704 }
705 }
706
Linus Walleijd619bc12009-09-09 11:31:00 +0200707 /* Register the regulators */
708 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
Linus Walleij9b318352013-04-22 11:57:14 +0200709 struct regulator_desc *desc = &ab3100_regulator_desc[i];
Linus Walleijd619bc12009-09-09 11:31:00 +0200710
Linus Walleij8735bc22013-04-22 11:57:25 +0200711 err = ab3100_regulator_register(pdev, plfdata, NULL, NULL,
712 desc->id);
Axel Lin018fd852013-04-26 21:57:09 +0800713 if (err) {
714 ab3100_regulators_remove(pdev);
Linus Walleijd619bc12009-09-09 11:31:00 +0200715 return err;
Axel Lin018fd852013-04-26 21:57:09 +0800716 }
Linus Walleijd619bc12009-09-09 11:31:00 +0200717 }
718
719 return 0;
720}
721
Linus Walleijd619bc12009-09-09 11:31:00 +0200722static struct platform_driver ab3100_regulators_driver = {
723 .driver = {
724 .name = "ab3100-regulators",
725 .owner = THIS_MODULE,
726 },
727 .probe = ab3100_regulators_probe,
Bill Pemberton5eb9f2b2012-11-19 13:20:42 -0500728 .remove = ab3100_regulators_remove,
Linus Walleijd619bc12009-09-09 11:31:00 +0200729};
730
731static __init int ab3100_regulators_init(void)
732{
733 return platform_driver_register(&ab3100_regulators_driver);
734}
735
736static __exit void ab3100_regulators_exit(void)
737{
Linus Walleij176f45b2009-10-28 17:30:15 +0100738 platform_driver_unregister(&ab3100_regulators_driver);
Linus Walleijd619bc12009-09-09 11:31:00 +0200739}
740
741subsys_initcall(ab3100_regulators_init);
742module_exit(ab3100_regulators_exit);
743
744MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
745MODULE_DESCRIPTION("AB3100 Regulator driver");
746MODULE_LICENSE("GPL");
747MODULE_ALIAS("platform:ab3100-regulators");