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Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +01001/*
2 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
3 *
4 * Copyright (C) 2012 Renesas Electronics Corporation
5 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the version 2 of the GNU General Public License as
9 * published by the Free Software Foundation
10 */
11
12#include <linux/err.h>
13#include <linux/init.h>
14#include <linux/mfd/as3711.h>
15#include <linux/module.h>
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +010016#include <linux/of.h>
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010017#include <linux/platform_device.h>
18#include <linux/regmap.h>
19#include <linux/regulator/driver.h>
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +010020#include <linux/regulator/of_regulator.h>
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010021#include <linux/slab.h>
22
23struct as3711_regulator_info {
24 struct regulator_desc desc;
25 unsigned int max_uV;
26};
27
28struct as3711_regulator {
29 struct as3711_regulator_info *reg_info;
30 struct regulator_dev *rdev;
31};
32
33static int as3711_list_voltage_sd(struct regulator_dev *rdev,
34 unsigned int selector)
35{
36 if (selector >= rdev->desc->n_voltages)
37 return -EINVAL;
38
39 if (!selector)
40 return 0;
41 if (selector < 0x41)
42 return 600000 + selector * 12500;
43 if (selector < 0x71)
44 return 1400000 + (selector - 0x40) * 25000;
45 return 2600000 + (selector - 0x70) * 50000;
46}
47
48static int as3711_list_voltage_aldo(struct regulator_dev *rdev,
49 unsigned int selector)
50{
51 if (selector >= rdev->desc->n_voltages)
52 return -EINVAL;
53
54 if (selector < 0x10)
55 return 1200000 + selector * 50000;
56 return 1800000 + (selector - 0x10) * 100000;
57}
58
59static int as3711_list_voltage_dldo(struct regulator_dev *rdev,
60 unsigned int selector)
61{
62 if (selector >= rdev->desc->n_voltages ||
63 (selector > 0x10 && selector < 0x20))
64 return -EINVAL;
65
66 if (selector < 0x11)
67 return 900000 + selector * 50000;
68 return 1750000 + (selector - 0x20) * 50000;
69}
70
71static int as3711_bound_check(struct regulator_dev *rdev,
72 int *min_uV, int *max_uV)
73{
Axel Lin16ed9f02012-11-24 00:50:52 +080074 struct as3711_regulator *reg = rdev_get_drvdata(rdev);
75 struct as3711_regulator_info *info = reg->reg_info;
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010076
77 dev_dbg(&rdev->dev, "%s(), %d, %d, %d\n", __func__,
78 *min_uV, rdev->desc->min_uV, info->max_uV);
79
80 if (*max_uV < *min_uV ||
Axel Lin16ed9f02012-11-24 00:50:52 +080081 *min_uV > info->max_uV || rdev->desc->min_uV > *max_uV)
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010082 return -EINVAL;
83
84 if (rdev->desc->n_voltages == 1)
85 return 0;
86
87 if (*max_uV > info->max_uV)
88 *max_uV = info->max_uV;
89
90 if (*min_uV < rdev->desc->min_uV)
91 *min_uV = rdev->desc->min_uV;
92
93 return *min_uV;
94}
95
96static int as3711_sel_check(int min, int max, int bottom, int step)
97{
Axel Lin7a4beda02012-11-24 00:53:22 +080098 int sel, voltage;
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +010099
100 /* Round up min, when dividing: keeps us within the range */
Axel Lin7a4beda02012-11-24 00:53:22 +0800101 sel = DIV_ROUND_UP(min - bottom, step);
102 voltage = sel * step + bottom;
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100103 pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__,
Axel Lin7a4beda02012-11-24 00:53:22 +0800104 min, max, bottom, step, sel);
105 if (voltage > max)
106 return -EINVAL;
107
108 return sel;
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100109}
110
111static int as3711_map_voltage_sd(struct regulator_dev *rdev,
112 int min_uV, int max_uV)
113{
114 int ret;
115
116 ret = as3711_bound_check(rdev, &min_uV, &max_uV);
117 if (ret <= 0)
118 return ret;
119
120 if (min_uV <= 1400000)
121 return as3711_sel_check(min_uV, max_uV, 600000, 12500);
122
123 if (min_uV <= 2600000)
124 return as3711_sel_check(min_uV, max_uV, 1400000, 25000) + 0x40;
125
126 return as3711_sel_check(min_uV, max_uV, 2600000, 50000) + 0x70;
127}
128
129/*
130 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
131 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
132 * FAST: sdX_fast=1
133 * NORMAL: low_noise=1
134 * IDLE: low_noise=0
135 */
136
137static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
138{
139 unsigned int fast_bit = rdev->desc->enable_mask,
140 low_noise_bit = fast_bit << 4;
141 u8 val;
142
143 switch (mode) {
144 case REGULATOR_MODE_FAST:
145 val = fast_bit | low_noise_bit;
146 break;
147 case REGULATOR_MODE_NORMAL:
148 val = low_noise_bit;
149 break;
150 case REGULATOR_MODE_IDLE:
151 val = 0;
152 break;
153 default:
154 return -EINVAL;
155 }
156
157 return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
158 low_noise_bit | fast_bit, val);
159}
160
161static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
162{
163 unsigned int fast_bit = rdev->desc->enable_mask,
164 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
165 unsigned int val;
166 int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
167
168 if (ret < 0)
169 return ret;
170
171 if ((val & mask) == mask)
172 return REGULATOR_MODE_FAST;
173
174 if ((val & mask) == low_noise_bit)
175 return REGULATOR_MODE_NORMAL;
176
177 if (!(val & mask))
178 return REGULATOR_MODE_IDLE;
179
180 return -EINVAL;
181}
182
183static int as3711_map_voltage_aldo(struct regulator_dev *rdev,
184 int min_uV, int max_uV)
185{
186 int ret;
187
188 ret = as3711_bound_check(rdev, &min_uV, &max_uV);
189 if (ret <= 0)
190 return ret;
191
192 if (min_uV <= 1800000)
193 return as3711_sel_check(min_uV, max_uV, 1200000, 50000);
194
195 return as3711_sel_check(min_uV, max_uV, 1800000, 100000) + 0x10;
196}
197
198static int as3711_map_voltage_dldo(struct regulator_dev *rdev,
199 int min_uV, int max_uV)
200{
201 int ret;
202
203 ret = as3711_bound_check(rdev, &min_uV, &max_uV);
204 if (ret <= 0)
205 return ret;
206
207 if (min_uV <= 1700000)
208 return as3711_sel_check(min_uV, max_uV, 900000, 50000);
209
210 return as3711_sel_check(min_uV, max_uV, 1750000, 50000) + 0x20;
211}
212
213static struct regulator_ops as3711_sd_ops = {
214 .is_enabled = regulator_is_enabled_regmap,
215 .enable = regulator_enable_regmap,
216 .disable = regulator_disable_regmap,
217 .get_voltage_sel = regulator_get_voltage_sel_regmap,
218 .set_voltage_sel = regulator_set_voltage_sel_regmap,
219 .list_voltage = as3711_list_voltage_sd,
220 .map_voltage = as3711_map_voltage_sd,
221 .get_mode = as3711_get_mode_sd,
222 .set_mode = as3711_set_mode_sd,
223};
224
225static struct regulator_ops as3711_aldo_ops = {
226 .is_enabled = regulator_is_enabled_regmap,
227 .enable = regulator_enable_regmap,
228 .disable = regulator_disable_regmap,
229 .get_voltage_sel = regulator_get_voltage_sel_regmap,
230 .set_voltage_sel = regulator_set_voltage_sel_regmap,
231 .list_voltage = as3711_list_voltage_aldo,
232 .map_voltage = as3711_map_voltage_aldo,
233};
234
235static struct regulator_ops as3711_dldo_ops = {
236 .is_enabled = regulator_is_enabled_regmap,
237 .enable = regulator_enable_regmap,
238 .disable = regulator_disable_regmap,
239 .get_voltage_sel = regulator_get_voltage_sel_regmap,
240 .set_voltage_sel = regulator_set_voltage_sel_regmap,
241 .list_voltage = as3711_list_voltage_dldo,
242 .map_voltage = as3711_map_voltage_dldo,
243};
244
245#define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx) \
246 [AS3711_REGULATOR_ ## _id] = { \
247 .desc = { \
248 .name = "as3711-regulator-" # _id, \
249 .id = AS3711_REGULATOR_ ## _id, \
250 .n_voltages = (_vmask + 1), \
251 .ops = &as3711_ ## _sfx ## _ops, \
252 .type = REGULATOR_VOLTAGE, \
253 .owner = THIS_MODULE, \
254 .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \
255 .vsel_mask = _vmask << _vshift, \
256 .enable_reg = AS3711_ ## _en_reg, \
257 .enable_mask = BIT(_en_bit), \
258 .min_uV = _min_uV, \
259 }, \
260 .max_uV = _max_uV, \
261}
262
263static struct as3711_regulator_info as3711_reg_info[] = {
264 AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
265 AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
266 AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
267 AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
268 AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
269 AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
270 AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
271 AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
272 AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
273 AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
274 AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
275 AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
276 /* StepUp output voltage depends on supplying regulator */
277};
278
279#define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
280
Axel Lind6c7d732013-04-17 16:01:22 +0800281static struct of_regulator_match
282as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
283 [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
284 [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
285 [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
286 [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
287 [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
288 [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
289 [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
290 [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
291 [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
292 [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
293 [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
294 [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100295};
296
297static int as3711_regulator_parse_dt(struct device *dev,
298 struct device_node **of_node, const int count)
299{
300 struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
301 struct device_node *regulators =
302 of_find_node_by_name(dev->parent->of_node, "regulators");
Axel Lind6c7d732013-04-17 16:01:22 +0800303 struct of_regulator_match *match;
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100304 int ret, i;
305
306 if (!regulators) {
307 dev_err(dev, "regulator node not found\n");
308 return -ENODEV;
309 }
310
Axel Lind6c7d732013-04-17 16:01:22 +0800311 ret = of_regulator_match(dev->parent, regulators,
312 as3711_regulator_matches, count);
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100313 of_node_put(regulators);
314 if (ret < 0) {
315 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
316 return ret;
317 }
318
Axel Lind6c7d732013-04-17 16:01:22 +0800319 for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100320 if (match->of_node) {
321 pdata->init_data[i] = match->init_data;
322 of_node[i] = match->of_node;
323 }
324
325 return 0;
326}
327
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100328static int as3711_regulator_probe(struct platform_device *pdev)
329{
330 struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
331 struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
332 struct regulator_init_data *reg_data;
333 struct regulator_config config = {.dev = &pdev->dev,};
334 struct as3711_regulator *reg = NULL;
335 struct as3711_regulator *regs;
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100336 struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100337 struct regulator_dev *rdev;
338 struct as3711_regulator_info *ri;
339 int ret;
340 int id;
341
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100342 if (!pdata) {
343 dev_err(&pdev->dev, "No platform data...\n");
344 return -ENODEV;
345 }
346
347 if (pdev->dev.parent->of_node) {
348 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
349 if (ret < 0) {
350 dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
351 return ret;
352 }
353 }
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100354
355 regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
356 sizeof(struct as3711_regulator), GFP_KERNEL);
357 if (!regs) {
358 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
359 return -ENOMEM;
360 }
361
362 for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100363 reg_data = pdata->init_data[id];
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100364
365 /* No need to register if there is no regulator data */
Axel Lin09ca50d2013-02-13 09:34:48 +0800366 if (!reg_data)
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100367 continue;
368
369 reg = &regs[id];
370 reg->reg_info = ri;
371
372 config.init_data = reg_data;
373 config.driver_data = reg;
374 config.regmap = as3711->regmap;
Guennadi Liakhovetski416d6752013-03-22 17:15:48 +0100375 config.of_node = of_node[id];
Guennadi Liakhovetskif1e64f92012-11-22 11:12:08 +0100376
377 rdev = regulator_register(&ri->desc, &config);
378 if (IS_ERR(rdev)) {
379 dev_err(&pdev->dev, "Failed to register regulator %s\n",
380 ri->desc.name);
381 ret = PTR_ERR(rdev);
382 goto eregreg;
383 }
384 reg->rdev = rdev;
385 }
386 platform_set_drvdata(pdev, regs);
387 return 0;
388
389eregreg:
390 while (--id >= 0)
391 regulator_unregister(regs[id].rdev);
392
393 return ret;
394}
395
396static int as3711_regulator_remove(struct platform_device *pdev)
397{
398 struct as3711_regulator *regs = platform_get_drvdata(pdev);
399 int id;
400
401 for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
402 regulator_unregister(regs[id].rdev);
403 return 0;
404}
405
406static struct platform_driver as3711_regulator_driver = {
407 .driver = {
408 .name = "as3711-regulator",
409 .owner = THIS_MODULE,
410 },
411 .probe = as3711_regulator_probe,
412 .remove = as3711_regulator_remove,
413};
414
415static int __init as3711_regulator_init(void)
416{
417 return platform_driver_register(&as3711_regulator_driver);
418}
419subsys_initcall(as3711_regulator_init);
420
421static void __exit as3711_regulator_exit(void)
422{
423 platform_driver_unregister(&as3711_regulator_driver);
424}
425module_exit(as3711_regulator_exit);
426
427MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
428MODULE_DESCRIPTION("AS3711 regulator driver");
429MODULE_ALIAS("platform:as3711-regulator");
430MODULE_LICENSE("GPL v2");