1/*
2 * Copyright (c) 2014 MediaTek Inc.
3 * Author: Flora Fu <flora.fu@mediatek.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/regmap.h>
19#include <linux/mfd/mt6397/core.h>
20#include <linux/mfd/mt6397/registers.h>
21#include <linux/regulator/driver.h>
22#include <linux/regulator/machine.h>
23#include <linux/regulator/mt6397-regulator.h>
24#include <linux/regulator/of_regulator.h>
25
26#define MT6397_BUCK_MODE_AUTO 0
27#define MT6397_BUCK_MODE_FORCE_PWM 1
28
29/*
30 * MT6397 regulators' information
31 *
32 * @desc: standard fields of regulator description.
33 * @qi: Mask for query enable signal status of regulators
34 * @vselon_reg: Register sections for hardware control mode of bucks
35 * @vselctrl_reg: Register for controlling the buck control mode.
36 * @vselctrl_mask: Mask for query buck's voltage control mode.
37 */
38struct mt6397_regulator_info {
39 struct regulator_desc desc;
40 u32 qi;
41 u32 vselon_reg;
42 u32 vselctrl_reg;
43 u32 vselctrl_mask;
44 u32 modeset_reg;
45 u32 modeset_mask;
46 u32 modeset_shift;
47};
48
49#define MT6397_BUCK(match, vreg, min, max, step, volt_ranges, enreg, \
50 vosel, vosel_mask, voselon, vosel_ctrl, _modeset_reg, \
51 _modeset_shift) \
52[MT6397_ID_##vreg] = { \
53 .desc = { \
54 .name = #vreg, \
55 .of_match = of_match_ptr(match), \
56 .ops = &mt6397_volt_range_ops, \
57 .type = REGULATOR_VOLTAGE, \
58 .id = MT6397_ID_##vreg, \
59 .owner = THIS_MODULE, \
60 .n_voltages = (max - min)/step + 1, \
61 .linear_ranges = volt_ranges, \
62 .n_linear_ranges = ARRAY_SIZE(volt_ranges), \
63 .vsel_reg = vosel, \
64 .vsel_mask = vosel_mask, \
65 .enable_reg = enreg, \
66 .enable_mask = BIT(0), \
67 }, \
68 .qi = BIT(13), \
69 .vselon_reg = voselon, \
70 .vselctrl_reg = vosel_ctrl, \
71 .vselctrl_mask = BIT(1), \
72 .modeset_reg = _modeset_reg, \
73 .modeset_mask = BIT(_modeset_shift), \
74 .modeset_shift = _modeset_shift \
75}
76
77#define MT6397_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel, \
78 vosel_mask) \
79[MT6397_ID_##vreg] = { \
80 .desc = { \
81 .name = #vreg, \
82 .of_match = of_match_ptr(match), \
83 .ops = &mt6397_volt_table_ops, \
84 .type = REGULATOR_VOLTAGE, \
85 .id = MT6397_ID_##vreg, \
86 .owner = THIS_MODULE, \
87 .n_voltages = ARRAY_SIZE(ldo_volt_table), \
88 .volt_table = ldo_volt_table, \
89 .vsel_reg = vosel, \
90 .vsel_mask = vosel_mask, \
91 .enable_reg = enreg, \
92 .enable_mask = BIT(enbit), \
93 }, \
94 .qi = BIT(15), \
95}
96
97#define MT6397_REG_FIXED(match, vreg, enreg, enbit, volt) \
98[MT6397_ID_##vreg] = { \
99 .desc = { \
100 .name = #vreg, \
101 .of_match = of_match_ptr(match), \
102 .ops = &mt6397_volt_fixed_ops, \
103 .type = REGULATOR_VOLTAGE, \
104 .id = MT6397_ID_##vreg, \
105 .owner = THIS_MODULE, \
106 .n_voltages = 1, \
107 .enable_reg = enreg, \
108 .enable_mask = BIT(enbit), \
109 .min_uV = volt, \
110 }, \
111 .qi = BIT(15), \
112}
113
114static const struct regulator_linear_range buck_volt_range1[] = {
115 REGULATOR_LINEAR_RANGE(700000, 0, 0x7f, 6250),
116};
117
118static const struct regulator_linear_range buck_volt_range2[] = {
119 REGULATOR_LINEAR_RANGE(800000, 0, 0x7f, 6250),
120};
121
122static const struct regulator_linear_range buck_volt_range3[] = {
123 REGULATOR_LINEAR_RANGE(1500000, 0, 0x1f, 20000),
124};
125
126static const u32 ldo_volt_table1[] = {
127 1500000, 1800000, 2500000, 2800000,
128};
129
130static const u32 ldo_volt_table2[] = {
131 1800000, 3300000,
132};
133
134static const u32 ldo_volt_table3[] = {
135 3000000, 3300000,
136};
137
138static const u32 ldo_volt_table4[] = {
139 1220000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
140};
141
142static const u32 ldo_volt_table5[] = {
143 1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
144};
145
146static const u32 ldo_volt_table5_v2[] = {
147 1200000, 1000000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
148};
149
150static const u32 ldo_volt_table6[] = {
151 1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 2000000,
152};
153
154static const u32 ldo_volt_table7[] = {
155 1300000, 1500000, 1800000, 2000000, 2500000, 2800000, 3000000, 3300000,
156};
157
158static int mt6397_regulator_set_mode(struct regulator_dev *rdev,
159 unsigned int mode)
160{
161 struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
162 int ret, val;
163
164 switch (mode) {
165 case REGULATOR_MODE_FAST:
166 val = MT6397_BUCK_MODE_FORCE_PWM;
167 break;
168 case REGULATOR_MODE_NORMAL:
169 val = MT6397_BUCK_MODE_AUTO;
170 break;
171 default:
172 ret = -EINVAL;
173 goto err_mode;
174 }
175
176 dev_dbg(&rdev->dev, "mt6397 buck set_mode %#x, %#x, %#x, %#x\n",
177 info->modeset_reg, info->modeset_mask,
178 info->modeset_shift, val);
179
180 val <<= info->modeset_shift;
181 ret = regmap_update_bits(rdev->regmap, info->modeset_reg,
182 info->modeset_mask, val);
183err_mode:
184 if (ret != 0) {
185 dev_err(&rdev->dev,
186 "Failed to set mt6397 buck mode: %d\n", ret);
187 return ret;
188 }
189
190 return 0;
191}
192
193static unsigned int mt6397_regulator_get_mode(struct regulator_dev *rdev)
194{
195 struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
196 int ret, regval;
197
198 ret = regmap_read(rdev->regmap, info->modeset_reg, &regval);
199 if (ret != 0) {
200 dev_err(&rdev->dev,
201 "Failed to get mt6397 buck mode: %d\n", ret);
202 return ret;
203 }
204
205 switch ((regval & info->modeset_mask) >> info->modeset_shift) {
206 case MT6397_BUCK_MODE_AUTO:
207 return REGULATOR_MODE_NORMAL;
208 case MT6397_BUCK_MODE_FORCE_PWM:
209 return REGULATOR_MODE_FAST;
210 default:
211 return -EINVAL;
212 }
213}
214
215static int mt6397_get_status(struct regulator_dev *rdev)
216{
217 int ret;
218 u32 regval;
219 struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
220
221 ret = regmap_read(rdev->regmap, info->desc.enable_reg, &regval);
222 if (ret != 0) {
223 dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
224 return ret;
225 }
226
227 return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
228}
229
230static const struct regulator_ops mt6397_volt_range_ops = {
231 .list_voltage = regulator_list_voltage_linear_range,
232 .map_voltage = regulator_map_voltage_linear_range,
233 .set_voltage_sel = regulator_set_voltage_sel_regmap,
234 .get_voltage_sel = regulator_get_voltage_sel_regmap,
235 .set_voltage_time_sel = regulator_set_voltage_time_sel,
236 .enable = regulator_enable_regmap,
237 .disable = regulator_disable_regmap,
238 .is_enabled = regulator_is_enabled_regmap,
239 .get_status = mt6397_get_status,
240 .set_mode = mt6397_regulator_set_mode,
241 .get_mode = mt6397_regulator_get_mode,
242};
243
244static const struct regulator_ops mt6397_volt_table_ops = {
245 .list_voltage = regulator_list_voltage_table,
246 .map_voltage = regulator_map_voltage_iterate,
247 .set_voltage_sel = regulator_set_voltage_sel_regmap,
248 .get_voltage_sel = regulator_get_voltage_sel_regmap,
249 .set_voltage_time_sel = regulator_set_voltage_time_sel,
250 .enable = regulator_enable_regmap,
251 .disable = regulator_disable_regmap,
252 .is_enabled = regulator_is_enabled_regmap,
253 .get_status = mt6397_get_status,
254};
255
256static const struct regulator_ops mt6397_volt_fixed_ops = {
257 .list_voltage = regulator_list_voltage_linear,
258 .enable = regulator_enable_regmap,
259 .disable = regulator_disable_regmap,
260 .is_enabled = regulator_is_enabled_regmap,
261 .get_status = mt6397_get_status,
262};
263
264/* The array is indexed by id(MT6397_ID_XXX) */
265static struct mt6397_regulator_info mt6397_regulators[] = {
266 MT6397_BUCK("buck_vpca15", VPCA15, 700000, 1493750, 6250,
267 buck_volt_range1, MT6397_VCA15_CON7, MT6397_VCA15_CON9, 0x7f,
268 MT6397_VCA15_CON10, MT6397_VCA15_CON5, MT6397_VCA15_CON2, 11),
269 MT6397_BUCK("buck_vpca7", VPCA7, 700000, 1493750, 6250,
270 buck_volt_range1, MT6397_VPCA7_CON7, MT6397_VPCA7_CON9, 0x7f,
271 MT6397_VPCA7_CON10, MT6397_VPCA7_CON5, MT6397_VPCA7_CON2, 8),
272 MT6397_BUCK("buck_vsramca15", VSRAMCA15, 700000, 1493750, 6250,
273 buck_volt_range1, MT6397_VSRMCA15_CON7, MT6397_VSRMCA15_CON9,
274 0x7f, MT6397_VSRMCA15_CON10, MT6397_VSRMCA15_CON5,
275 MT6397_VSRMCA15_CON2, 8),
276 MT6397_BUCK("buck_vsramca7", VSRAMCA7, 700000, 1493750, 6250,
277 buck_volt_range1, MT6397_VSRMCA7_CON7, MT6397_VSRMCA7_CON9,
278 0x7f, MT6397_VSRMCA7_CON10, MT6397_VSRMCA7_CON5,
279 MT6397_VSRMCA7_CON2, 8),
280 MT6397_BUCK("buck_vcore", VCORE, 700000, 1493750, 6250,
281 buck_volt_range1, MT6397_VCORE_CON7, MT6397_VCORE_CON9, 0x7f,
282 MT6397_VCORE_CON10, MT6397_VCORE_CON5, MT6397_VCORE_CON2, 8),
283 MT6397_BUCK("buck_vgpu", VGPU, 700000, 1493750, 6250, buck_volt_range1,
284 MT6397_VGPU_CON7, MT6397_VGPU_CON9, 0x7f,
285 MT6397_VGPU_CON10, MT6397_VGPU_CON5, MT6397_VGPU_CON2, 8),
286 MT6397_BUCK("buck_vdrm", VDRM, 800000, 1593750, 6250, buck_volt_range2,
287 MT6397_VDRM_CON7, MT6397_VDRM_CON9, 0x7f,
288 MT6397_VDRM_CON10, MT6397_VDRM_CON5, MT6397_VDRM_CON2, 8),
289 MT6397_BUCK("buck_vio18", VIO18, 1500000, 2120000, 20000,
290 buck_volt_range3, MT6397_VIO18_CON7, MT6397_VIO18_CON9, 0x1f,
291 MT6397_VIO18_CON10, MT6397_VIO18_CON5, MT6397_VIO18_CON2, 8),
292 MT6397_REG_FIXED("ldo_vtcxo", VTCXO, MT6397_ANALDO_CON0, 10, 2800000),
293 MT6397_REG_FIXED("ldo_va28", VA28, MT6397_ANALDO_CON1, 14, 2800000),
294 MT6397_LDO("ldo_vcama", VCAMA, ldo_volt_table1,
295 MT6397_ANALDO_CON2, 15, MT6397_ANALDO_CON6, 0xC0),
296 MT6397_REG_FIXED("ldo_vio28", VIO28, MT6397_DIGLDO_CON0, 14, 2800000),
297 MT6397_REG_FIXED("ldo_vusb", VUSB, MT6397_DIGLDO_CON1, 14, 3300000),
298 MT6397_LDO("ldo_vmc", VMC, ldo_volt_table2,
299 MT6397_DIGLDO_CON2, 12, MT6397_DIGLDO_CON29, 0x10),
300 MT6397_LDO("ldo_vmch", VMCH, ldo_volt_table3,
301 MT6397_DIGLDO_CON3, 14, MT6397_DIGLDO_CON17, 0x80),
302 MT6397_LDO("ldo_vemc3v3", VEMC3V3, ldo_volt_table3,
303 MT6397_DIGLDO_CON4, 14, MT6397_DIGLDO_CON18, 0x10),
304 MT6397_LDO("ldo_vgp1", VGP1, ldo_volt_table4,
305 MT6397_DIGLDO_CON5, 15, MT6397_DIGLDO_CON19, 0xE0),
306 MT6397_LDO("ldo_vgp2", VGP2, ldo_volt_table5,
307 MT6397_DIGLDO_CON6, 15, MT6397_DIGLDO_CON20, 0xE0),
308 MT6397_LDO("ldo_vgp3", VGP3, ldo_volt_table5,
309 MT6397_DIGLDO_CON7, 15, MT6397_DIGLDO_CON21, 0xE0),
310 MT6397_LDO("ldo_vgp4", VGP4, ldo_volt_table5,
311 MT6397_DIGLDO_CON8, 15, MT6397_DIGLDO_CON22, 0xE0),
312 MT6397_LDO("ldo_vgp5", VGP5, ldo_volt_table6,
313 MT6397_DIGLDO_CON9, 15, MT6397_DIGLDO_CON23, 0xE0),
314 MT6397_LDO("ldo_vgp6", VGP6, ldo_volt_table5,
315 MT6397_DIGLDO_CON10, 15, MT6397_DIGLDO_CON33, 0xE0),
316 MT6397_LDO("ldo_vibr", VIBR, ldo_volt_table7,
317 MT6397_DIGLDO_CON24, 15, MT6397_DIGLDO_CON25, 0xE00),
318};
319
320static int mt6397_set_buck_vosel_reg(struct platform_device *pdev)
321{
322 struct mt6397_chip *mt6397 = dev_get_drvdata(pdev->dev.parent);
323 int i;
324 u32 regval;
325
326 for (i = 0; i < MT6397_MAX_REGULATOR; i++) {
327 if (mt6397_regulators[i].vselctrl_reg) {
328 if (regmap_read(mt6397->regmap,
329 mt6397_regulators[i].vselctrl_reg,
330 &regval) < 0) {
331 dev_err(&pdev->dev,
332 "Failed to read buck ctrl\n");
333 return -EIO;
334 }
335
336 if (regval & mt6397_regulators[i].vselctrl_mask) {
337 mt6397_regulators[i].desc.vsel_reg =
338 mt6397_regulators[i].vselon_reg;
339 }
340 }
341 }
342
343 return 0;
344}
345
346static int mt6397_regulator_probe(struct platform_device *pdev)
347{
348 struct mt6397_chip *mt6397 = dev_get_drvdata(pdev->dev.parent);
349 struct regulator_config config = {};
350 struct regulator_dev *rdev;
351 int i;
352 u32 reg_value, version;
353
354 /* Query buck controller to select activated voltage register part */
355 if (mt6397_set_buck_vosel_reg(pdev))
356 return -EIO;
357
358 /* Read PMIC chip revision to update constraints and voltage table */
359 if (regmap_read(mt6397->regmap, MT6397_CID, &reg_value) < 0) {
360 dev_err(&pdev->dev, "Failed to read Chip ID\n");
361 return -EIO;
362 }
363 dev_info(&pdev->dev, "Chip ID = 0x%x\n", reg_value);
364
365 version = (reg_value & 0xFF);
366 switch (version) {
367 case MT6397_REGULATOR_ID91:
368 mt6397_regulators[MT6397_ID_VGP2].desc.volt_table =
369 ldo_volt_table5_v2;
370 break;
371 default:
372 break;
373 }
374
375 for (i = 0; i < MT6397_MAX_REGULATOR; i++) {
376 config.dev = &pdev->dev;
377 config.driver_data = &mt6397_regulators[i];
378 config.regmap = mt6397->regmap;
379 rdev = devm_regulator_register(&pdev->dev,
380 &mt6397_regulators[i].desc, &config);
381 if (IS_ERR(rdev)) {
382 dev_err(&pdev->dev, "failed to register %s\n",
383 mt6397_regulators[i].desc.name);
384 return PTR_ERR(rdev);
385 }
386 }
387
388 return 0;
389}
390
391static const struct platform_device_id mt6397_platform_ids[] = {
392 {"mt6397-regulator", 0},
393 { /* sentinel */ },
394};
395MODULE_DEVICE_TABLE(platform, mt6397_platform_ids);
396
397static const struct of_device_id mt6397_of_match[] = {
398 { .compatible = "mediatek,mt6397-regulator", },
399 { /* sentinel */ },
400};
401MODULE_DEVICE_TABLE(of, mt6397_of_match);
402
403static struct platform_driver mt6397_regulator_driver = {
404 .driver = {
405 .name = "mt6397-regulator",
406 .of_match_table = of_match_ptr(mt6397_of_match),
407 },
408 .probe = mt6397_regulator_probe,
409 .id_table = mt6397_platform_ids,
410};
411
412module_platform_driver(mt6397_regulator_driver);
413
414MODULE_AUTHOR("Flora Fu <flora.fu@mediatek.com>");
415MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6397 PMIC");
416MODULE_LICENSE("GPL");
417