1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // da9052-regulator.c: Regulator driver for DA9052
4 //
5 // Copyright(c) 2011 Dialog Semiconductor Ltd.
6 //
7 // Author: David Dajun Chen <dchen@diasemi.com>
8
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/init.h>
12 #include <linux/err.h>
13 #include <linux/platform_device.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/regulator/machine.h>
16 #include <linux/of.h>
17 #include <linux/regulator/of_regulator.h>
18
19 #include <linux/mfd/da9052/da9052.h>
20 #include <linux/mfd/da9052/reg.h>
21 #include <linux/mfd/da9052/pdata.h>
22
23 /* Buck step size */
24 #define DA9052_BUCK_PERI_3uV_STEP 100000
25 #define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV 24
26 #define DA9052_CONST_3uV 3000000
27
28 #define DA9052_MIN_UA 0
29 #define DA9052_MAX_UA 3
30 #define DA9052_CURRENT_RANGE 4
31
32 /* Bit masks */
33 #define DA9052_BUCK_ILIM_MASK_EVEN 0x0c
34 #define DA9052_BUCK_ILIM_MASK_ODD 0xc0
35
36 /* DA9052 REGULATOR IDs */
37 #define DA9052_ID_BUCK1 0
38 #define DA9052_ID_BUCK2 1
39 #define DA9052_ID_BUCK3 2
40 #define DA9052_ID_BUCK4 3
41 #define DA9052_ID_LDO1 4
42 #define DA9052_ID_LDO2 5
43 #define DA9052_ID_LDO3 6
44 #define DA9052_ID_LDO4 7
45 #define DA9052_ID_LDO5 8
46 #define DA9052_ID_LDO6 9
47 #define DA9052_ID_LDO7 10
48 #define DA9052_ID_LDO8 11
49 #define DA9052_ID_LDO9 12
50 #define DA9052_ID_LDO10 13
51
52 static const u32 da9052_current_limits[3][4] = {
53 {700000, 800000, 1000000, 1200000}, /* DA9052-BC BUCKs */
54 {1600000, 2000000, 2400000, 3000000}, /* DA9053-AA/Bx BUCK-CORE */
55 {800000, 1000000, 1200000, 1500000}, /* DA9053-AA/Bx BUCK-PRO,
56 * BUCK-MEM and BUCK-PERI
57 */
58 };
59
60 struct da9052_regulator_info {
61 struct regulator_desc reg_desc;
62 int step_uV;
63 int min_uV;
64 int max_uV;
65 unsigned char activate_bit;
66 };
67
68 struct da9052_regulator {
69 struct da9052 *da9052;
70 struct da9052_regulator_info *info;
71 struct regulator_dev *rdev;
72 };
73
verify_range(struct da9052_regulator_info * info,int min_uV,int max_uV)74 static int verify_range(struct da9052_regulator_info *info,
75 int min_uV, int max_uV)
76 {
77 if (min_uV > info->max_uV || max_uV < info->min_uV)
78 return -EINVAL;
79
80 return 0;
81 }
82
da9052_dcdc_get_current_limit(struct regulator_dev * rdev)83 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
84 {
85 struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
86 int offset = rdev_get_id(rdev);
87 int ret, row = 2;
88
89 ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
90 if (ret < 0)
91 return ret;
92
93 /* Determine the even or odd position of the buck current limit
94 * register field
95 */
96 if (offset % 2 == 0)
97 ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
98 else
99 ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
100
101 /* Select the appropriate current limit range */
102 if (regulator->da9052->chip_id == DA9052)
103 row = 0;
104 else if (offset == 0)
105 row = 1;
106
107 return da9052_current_limits[row][ret];
108 }
109
da9052_dcdc_set_current_limit(struct regulator_dev * rdev,int min_uA,int max_uA)110 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
111 int max_uA)
112 {
113 struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
114 int offset = rdev_get_id(rdev);
115 int reg_val = 0;
116 int i, row = 2;
117
118 /* Select the appropriate current limit range */
119 if (regulator->da9052->chip_id == DA9052)
120 row = 0;
121 else if (offset == 0)
122 row = 1;
123
124 for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
125 if ((min_uA <= da9052_current_limits[row][i]) &&
126 (da9052_current_limits[row][i] <= max_uA)) {
127 reg_val = i;
128 break;
129 }
130 }
131
132 if (i < 0)
133 return -EINVAL;
134
135 /* Determine the even or odd position of the buck current limit
136 * register field
137 */
138 if (offset % 2 == 0)
139 return da9052_reg_update(regulator->da9052,
140 DA9052_BUCKA_REG + offset/2,
141 DA9052_BUCK_ILIM_MASK_EVEN,
142 reg_val << 2);
143 else
144 return da9052_reg_update(regulator->da9052,
145 DA9052_BUCKA_REG + offset/2,
146 DA9052_BUCK_ILIM_MASK_ODD,
147 reg_val << 6);
148 }
149
da9052_list_voltage(struct regulator_dev * rdev,unsigned int selector)150 static int da9052_list_voltage(struct regulator_dev *rdev,
151 unsigned int selector)
152 {
153 struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
154 struct da9052_regulator_info *info = regulator->info;
155 int id = rdev_get_id(rdev);
156 int volt_uV;
157
158 if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
159 && (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
160 volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
161 + info->min_uV);
162 volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
163 * (DA9052_BUCK_PERI_3uV_STEP);
164 } else {
165 volt_uV = (selector * info->step_uV) + info->min_uV;
166 }
167
168 if (volt_uV > info->max_uV)
169 return -EINVAL;
170
171 return volt_uV;
172 }
173
da9052_map_voltage(struct regulator_dev * rdev,int min_uV,int max_uV)174 static int da9052_map_voltage(struct regulator_dev *rdev,
175 int min_uV, int max_uV)
176 {
177 struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
178 struct da9052_regulator_info *info = regulator->info;
179 int id = rdev_get_id(rdev);
180 int ret, sel;
181
182 ret = verify_range(info, min_uV, max_uV);
183 if (ret < 0)
184 return ret;
185
186 if (min_uV < info->min_uV)
187 min_uV = info->min_uV;
188
189 if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
190 && (min_uV >= DA9052_CONST_3uV)) {
191 sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
192 DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
193 DA9052_BUCK_PERI_3uV_STEP);
194 } else {
195 sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
196 }
197
198 ret = da9052_list_voltage(rdev, sel);
199 if (ret < 0)
200 return ret;
201
202 return sel;
203 }
204
da9052_regulator_set_voltage_sel(struct regulator_dev * rdev,unsigned int selector)205 static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
206 unsigned int selector)
207 {
208 struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
209 struct da9052_regulator_info *info = regulator->info;
210 int id = rdev_get_id(rdev);
211 int ret;
212
213 ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
214 rdev->desc->vsel_mask, selector);
215 if (ret < 0)
216 return ret;
217
218 /* Some LDOs and DCDCs are DVC controlled which requires enabling of
219 * the activate bit to implment the changes on the output.
220 */
221 switch (id) {
222 case DA9052_ID_BUCK1:
223 case DA9052_ID_BUCK2:
224 case DA9052_ID_BUCK3:
225 case DA9052_ID_LDO2:
226 case DA9052_ID_LDO3:
227 ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
228 info->activate_bit, info->activate_bit);
229 break;
230 }
231
232 return ret;
233 }
234
da9052_regulator_set_voltage_time_sel(struct regulator_dev * rdev,unsigned int old_sel,unsigned int new_sel)235 static int da9052_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
236 unsigned int old_sel,
237 unsigned int new_sel)
238 {
239 struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
240 struct da9052_regulator_info *info = regulator->info;
241 int id = rdev_get_id(rdev);
242 int ret = 0;
243
244 /* The DVC controlled LDOs and DCDCs ramp with 6.25mV/µs after enabling
245 * the activate bit.
246 */
247 switch (id) {
248 case DA9052_ID_BUCK1:
249 case DA9052_ID_BUCK2:
250 case DA9052_ID_BUCK3:
251 case DA9052_ID_LDO2:
252 case DA9052_ID_LDO3:
253 ret = DIV_ROUND_UP(abs(new_sel - old_sel) * info->step_uV,
254 6250);
255 break;
256 }
257
258 return ret;
259 }
260
261 static const struct regulator_ops da9052_dcdc_ops = {
262 .get_current_limit = da9052_dcdc_get_current_limit,
263 .set_current_limit = da9052_dcdc_set_current_limit,
264
265 .list_voltage = da9052_list_voltage,
266 .map_voltage = da9052_map_voltage,
267 .get_voltage_sel = regulator_get_voltage_sel_regmap,
268 .set_voltage_sel = da9052_regulator_set_voltage_sel,
269 .set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
270 .is_enabled = regulator_is_enabled_regmap,
271 .enable = regulator_enable_regmap,
272 .disable = regulator_disable_regmap,
273 };
274
275 static const struct regulator_ops da9052_ldo_ops = {
276 .list_voltage = da9052_list_voltage,
277 .map_voltage = da9052_map_voltage,
278 .get_voltage_sel = regulator_get_voltage_sel_regmap,
279 .set_voltage_sel = da9052_regulator_set_voltage_sel,
280 .set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
281 .is_enabled = regulator_is_enabled_regmap,
282 .enable = regulator_enable_regmap,
283 .disable = regulator_disable_regmap,
284 };
285
286 #define DA9052_LDO(_id, _name, step, min, max, sbits, ebits, abits) \
287 {\
288 .reg_desc = {\
289 .name = #_name,\
290 .of_match = of_match_ptr(#_name),\
291 .regulators_node = of_match_ptr("regulators"),\
292 .ops = &da9052_ldo_ops,\
293 .type = REGULATOR_VOLTAGE,\
294 .id = DA9052_ID_##_id,\
295 .n_voltages = (max - min) / step + 1, \
296 .owner = THIS_MODULE,\
297 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
298 .vsel_mask = (1 << (sbits)) - 1,\
299 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
300 .enable_mask = 1 << (ebits),\
301 },\
302 .min_uV = (min) * 1000,\
303 .max_uV = (max) * 1000,\
304 .step_uV = (step) * 1000,\
305 .activate_bit = (abits),\
306 }
307
308 #define DA9052_DCDC(_id, _name, step, min, max, sbits, ebits, abits) \
309 {\
310 .reg_desc = {\
311 .name = #_name,\
312 .of_match = of_match_ptr(#_name),\
313 .regulators_node = of_match_ptr("regulators"),\
314 .ops = &da9052_dcdc_ops,\
315 .type = REGULATOR_VOLTAGE,\
316 .id = DA9052_ID_##_id,\
317 .n_voltages = (max - min) / step + 1, \
318 .owner = THIS_MODULE,\
319 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
320 .vsel_mask = (1 << (sbits)) - 1,\
321 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
322 .enable_mask = 1 << (ebits),\
323 },\
324 .min_uV = (min) * 1000,\
325 .max_uV = (max) * 1000,\
326 .step_uV = (step) * 1000,\
327 .activate_bit = (abits),\
328 }
329
330 static struct da9052_regulator_info da9052_regulator_info[] = {
331 DA9052_DCDC(BUCK1, buck1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
332 DA9052_DCDC(BUCK2, buck2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
333 DA9052_DCDC(BUCK3, buck3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
334 DA9052_DCDC(BUCK4, buck4, 50, 1800, 3600, 5, 6, 0),
335 DA9052_LDO(LDO1, ldo1, 50, 600, 1800, 5, 6, 0),
336 DA9052_LDO(LDO2, ldo2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
337 DA9052_LDO(LDO3, ldo3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
338 DA9052_LDO(LDO4, ldo4, 25, 1725, 3300, 6, 6, 0),
339 DA9052_LDO(LDO5, ldo5, 50, 1200, 3600, 6, 6, 0),
340 DA9052_LDO(LDO6, ldo6, 50, 1200, 3600, 6, 6, 0),
341 DA9052_LDO(LDO7, ldo7, 50, 1200, 3600, 6, 6, 0),
342 DA9052_LDO(LDO8, ldo8, 50, 1200, 3600, 6, 6, 0),
343 DA9052_LDO(LDO9, ldo9, 50, 1250, 3650, 6, 6, 0),
344 DA9052_LDO(LDO10, ldo10, 50, 1200, 3600, 6, 6, 0),
345 };
346
347 static struct da9052_regulator_info da9053_regulator_info[] = {
348 DA9052_DCDC(BUCK1, buck1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
349 DA9052_DCDC(BUCK2, buck2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
350 DA9052_DCDC(BUCK3, buck3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
351 DA9052_DCDC(BUCK4, buck4, 25, 950, 2525, 6, 6, 0),
352 DA9052_LDO(LDO1, ldo1, 50, 600, 1800, 5, 6, 0),
353 DA9052_LDO(LDO2, ldo2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
354 DA9052_LDO(LDO3, ldo3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
355 DA9052_LDO(LDO4, ldo4, 25, 1725, 3300, 6, 6, 0),
356 DA9052_LDO(LDO5, ldo5, 50, 1200, 3600, 6, 6, 0),
357 DA9052_LDO(LDO6, ldo6, 50, 1200, 3600, 6, 6, 0),
358 DA9052_LDO(LDO7, ldo7, 50, 1200, 3600, 6, 6, 0),
359 DA9052_LDO(LDO8, ldo8, 50, 1200, 3600, 6, 6, 0),
360 DA9052_LDO(LDO9, ldo9, 50, 1250, 3650, 6, 6, 0),
361 DA9052_LDO(LDO10, ldo10, 50, 1200, 3600, 6, 6, 0),
362 };
363
find_regulator_info(u8 chip_id,int id)364 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
365 int id)
366 {
367 struct da9052_regulator_info *info;
368 int i;
369
370 switch (chip_id) {
371 case DA9052:
372 for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
373 info = &da9052_regulator_info[i];
374 if (info->reg_desc.id == id)
375 return info;
376 }
377 break;
378 case DA9053_AA:
379 case DA9053_BA:
380 case DA9053_BB:
381 case DA9053_BC:
382 for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
383 info = &da9053_regulator_info[i];
384 if (info->reg_desc.id == id)
385 return info;
386 }
387 break;
388 }
389
390 return NULL;
391 }
392
da9052_regulator_probe(struct platform_device * pdev)393 static int da9052_regulator_probe(struct platform_device *pdev)
394 {
395 const struct mfd_cell *cell = mfd_get_cell(pdev);
396 struct regulator_config config = { };
397 struct da9052_regulator *regulator;
398 struct da9052 *da9052;
399 struct da9052_pdata *pdata;
400
401 regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
402 GFP_KERNEL);
403 if (!regulator)
404 return -ENOMEM;
405
406 da9052 = dev_get_drvdata(pdev->dev.parent);
407 pdata = dev_get_platdata(da9052->dev);
408 regulator->da9052 = da9052;
409
410 regulator->info = find_regulator_info(regulator->da9052->chip_id,
411 cell->id);
412 if (regulator->info == NULL) {
413 dev_err(&pdev->dev, "invalid regulator ID specified\n");
414 return -EINVAL;
415 }
416
417 config.dev = da9052->dev;
418 config.driver_data = regulator;
419 config.regmap = da9052->regmap;
420 if (pdata)
421 config.init_data = pdata->regulators[cell->id];
422
423 regulator->rdev = devm_regulator_register(&pdev->dev,
424 ®ulator->info->reg_desc,
425 &config);
426 if (IS_ERR(regulator->rdev)) {
427 dev_err(&pdev->dev, "failed to register regulator %s\n",
428 regulator->info->reg_desc.name);
429 return PTR_ERR(regulator->rdev);
430 }
431
432 platform_set_drvdata(pdev, regulator);
433
434 return 0;
435 }
436
437 static struct platform_driver da9052_regulator_driver = {
438 .probe = da9052_regulator_probe,
439 .driver = {
440 .name = "da9052-regulator",
441 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
442 },
443 };
444
da9052_regulator_init(void)445 static int __init da9052_regulator_init(void)
446 {
447 return platform_driver_register(&da9052_regulator_driver);
448 }
449 subsys_initcall(da9052_regulator_init);
450
da9052_regulator_exit(void)451 static void __exit da9052_regulator_exit(void)
452 {
453 platform_driver_unregister(&da9052_regulator_driver);
454 }
455 module_exit(da9052_regulator_exit);
456
457 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
458 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
459 MODULE_LICENSE("GPL");
460 MODULE_ALIAS("platform:da9052-regulator");
461