1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2014 MediaTek Inc.
4 // Author: Flora Fu <flora.fu@mediatek.com>
5
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/platform_device.h>
9 #include <linux/regmap.h>
10 #include <linux/mfd/mt6397/core.h>
11 #include <linux/mfd/mt6397/registers.h>
12 #include <linux/regulator/driver.h>
13 #include <linux/regulator/machine.h>
14 #include <linux/regulator/mt6397-regulator.h>
15 #include <linux/regulator/of_regulator.h>
16 #include <dt-bindings/regulator/mediatek,mt6397-regulator.h>
17
18 /*
19 * MT6397 regulators' information
20 *
21 * @desc: standard fields of regulator description.
22 * @qi: Mask for query enable signal status of regulators
23 * @vselon_reg: Register sections for hardware control mode of bucks
24 * @vselctrl_reg: Register for controlling the buck control mode.
25 * @vselctrl_mask: Mask for query buck's voltage control mode.
26 */
27 struct mt6397_regulator_info {
28 struct regulator_desc desc;
29 u32 qi;
30 u32 vselon_reg;
31 u32 vselctrl_reg;
32 u32 vselctrl_mask;
33 u32 modeset_reg;
34 u32 modeset_mask;
35 u32 modeset_shift;
36 };
37
38 #define MT6397_BUCK(match, vreg, min, max, step, volt_ranges, enreg, \
39 vosel, vosel_mask, voselon, vosel_ctrl, _modeset_reg, \
40 _modeset_shift) \
41 [MT6397_ID_##vreg] = { \
42 .desc = { \
43 .name = #vreg, \
44 .of_match = of_match_ptr(match), \
45 .ops = &mt6397_volt_range_ops, \
46 .type = REGULATOR_VOLTAGE, \
47 .id = MT6397_ID_##vreg, \
48 .owner = THIS_MODULE, \
49 .n_voltages = (max - min)/step + 1, \
50 .linear_ranges = volt_ranges, \
51 .n_linear_ranges = ARRAY_SIZE(volt_ranges), \
52 .vsel_reg = vosel, \
53 .vsel_mask = vosel_mask, \
54 .enable_reg = enreg, \
55 .enable_mask = BIT(0), \
56 .of_map_mode = mt6397_map_mode, \
57 }, \
58 .qi = BIT(13), \
59 .vselon_reg = voselon, \
60 .vselctrl_reg = vosel_ctrl, \
61 .vselctrl_mask = BIT(1), \
62 .modeset_reg = _modeset_reg, \
63 .modeset_mask = BIT(_modeset_shift), \
64 .modeset_shift = _modeset_shift \
65 }
66
67 #define MT6397_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel, \
68 vosel_mask) \
69 [MT6397_ID_##vreg] = { \
70 .desc = { \
71 .name = #vreg, \
72 .of_match = of_match_ptr(match), \
73 .ops = &mt6397_volt_table_ops, \
74 .type = REGULATOR_VOLTAGE, \
75 .id = MT6397_ID_##vreg, \
76 .owner = THIS_MODULE, \
77 .n_voltages = ARRAY_SIZE(ldo_volt_table), \
78 .volt_table = ldo_volt_table, \
79 .vsel_reg = vosel, \
80 .vsel_mask = vosel_mask, \
81 .enable_reg = enreg, \
82 .enable_mask = BIT(enbit), \
83 }, \
84 .qi = BIT(15), \
85 }
86
87 #define MT6397_REG_FIXED(match, vreg, enreg, enbit, volt) \
88 [MT6397_ID_##vreg] = { \
89 .desc = { \
90 .name = #vreg, \
91 .of_match = of_match_ptr(match), \
92 .ops = &mt6397_volt_fixed_ops, \
93 .type = REGULATOR_VOLTAGE, \
94 .id = MT6397_ID_##vreg, \
95 .owner = THIS_MODULE, \
96 .n_voltages = 1, \
97 .enable_reg = enreg, \
98 .enable_mask = BIT(enbit), \
99 .min_uV = volt, \
100 }, \
101 .qi = BIT(15), \
102 }
103
104 static const struct linear_range buck_volt_range1[] = {
105 REGULATOR_LINEAR_RANGE(700000, 0, 0x7f, 6250),
106 };
107
108 static const struct linear_range buck_volt_range2[] = {
109 REGULATOR_LINEAR_RANGE(800000, 0, 0x7f, 6250),
110 };
111
112 static const struct linear_range buck_volt_range3[] = {
113 REGULATOR_LINEAR_RANGE(1500000, 0, 0x1f, 20000),
114 };
115
116 static const unsigned int ldo_volt_table1[] = {
117 1500000, 1800000, 2500000, 2800000,
118 };
119
120 static const unsigned int ldo_volt_table2[] = {
121 1800000, 3300000,
122 };
123
124 static const unsigned int ldo_volt_table3[] = {
125 3000000, 3300000,
126 };
127
128 static const unsigned int ldo_volt_table4[] = {
129 1220000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
130 };
131
132 static const unsigned int ldo_volt_table5[] = {
133 1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
134 };
135
136 static const unsigned int ldo_volt_table5_v2[] = {
137 1200000, 1000000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
138 };
139
140 static const unsigned int ldo_volt_table6[] = {
141 1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 2000000,
142 };
143
144 static const unsigned int ldo_volt_table7[] = {
145 1300000, 1500000, 1800000, 2000000, 2500000, 2800000, 3000000, 3300000,
146 };
147
mt6397_map_mode(unsigned int mode)148 static unsigned int mt6397_map_mode(unsigned int mode)
149 {
150 switch (mode) {
151 case MT6397_BUCK_MODE_AUTO:
152 return REGULATOR_MODE_NORMAL;
153 case MT6397_BUCK_MODE_FORCE_PWM:
154 return REGULATOR_MODE_FAST;
155 default:
156 return REGULATOR_MODE_INVALID;
157 }
158 }
159
mt6397_regulator_set_mode(struct regulator_dev * rdev,unsigned int mode)160 static int mt6397_regulator_set_mode(struct regulator_dev *rdev,
161 unsigned int mode)
162 {
163 struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
164 int ret, val;
165
166 switch (mode) {
167 case REGULATOR_MODE_FAST:
168 val = MT6397_BUCK_MODE_FORCE_PWM;
169 break;
170 case REGULATOR_MODE_NORMAL:
171 val = MT6397_BUCK_MODE_AUTO;
172 break;
173 default:
174 ret = -EINVAL;
175 goto err_mode;
176 }
177
178 dev_dbg(&rdev->dev, "mt6397 buck set_mode %#x, %#x, %#x, %#x\n",
179 info->modeset_reg, info->modeset_mask,
180 info->modeset_shift, val);
181
182 val <<= info->modeset_shift;
183 ret = regmap_update_bits(rdev->regmap, info->modeset_reg,
184 info->modeset_mask, val);
185 err_mode:
186 if (ret != 0) {
187 dev_err(&rdev->dev,
188 "Failed to set mt6397 buck mode: %d\n", ret);
189 return ret;
190 }
191
192 return 0;
193 }
194
mt6397_regulator_get_mode(struct regulator_dev * rdev)195 static unsigned int mt6397_regulator_get_mode(struct regulator_dev *rdev)
196 {
197 struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
198 int ret, regval;
199
200 ret = regmap_read(rdev->regmap, info->modeset_reg, ®val);
201 if (ret != 0) {
202 dev_err(&rdev->dev,
203 "Failed to get mt6397 buck mode: %d\n", ret);
204 return ret;
205 }
206
207 switch ((regval & info->modeset_mask) >> info->modeset_shift) {
208 case MT6397_BUCK_MODE_AUTO:
209 return REGULATOR_MODE_NORMAL;
210 case MT6397_BUCK_MODE_FORCE_PWM:
211 return REGULATOR_MODE_FAST;
212 default:
213 return -EINVAL;
214 }
215 }
216
mt6397_get_status(struct regulator_dev * rdev)217 static int mt6397_get_status(struct regulator_dev *rdev)
218 {
219 int ret;
220 u32 regval;
221 struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
222
223 ret = regmap_read(rdev->regmap, info->desc.enable_reg, ®val);
224 if (ret != 0) {
225 dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
226 return ret;
227 }
228
229 return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
230 }
231
232 static const struct regulator_ops mt6397_volt_range_ops = {
233 .list_voltage = regulator_list_voltage_linear_range,
234 .map_voltage = regulator_map_voltage_linear_range,
235 .set_voltage_sel = regulator_set_voltage_sel_regmap,
236 .get_voltage_sel = regulator_get_voltage_sel_regmap,
237 .set_voltage_time_sel = regulator_set_voltage_time_sel,
238 .enable = regulator_enable_regmap,
239 .disable = regulator_disable_regmap,
240 .is_enabled = regulator_is_enabled_regmap,
241 .get_status = mt6397_get_status,
242 .set_mode = mt6397_regulator_set_mode,
243 .get_mode = mt6397_regulator_get_mode,
244 };
245
246 static const struct regulator_ops mt6397_volt_table_ops = {
247 .list_voltage = regulator_list_voltage_table,
248 .map_voltage = regulator_map_voltage_iterate,
249 .set_voltage_sel = regulator_set_voltage_sel_regmap,
250 .get_voltage_sel = regulator_get_voltage_sel_regmap,
251 .set_voltage_time_sel = regulator_set_voltage_time_sel,
252 .enable = regulator_enable_regmap,
253 .disable = regulator_disable_regmap,
254 .is_enabled = regulator_is_enabled_regmap,
255 .get_status = mt6397_get_status,
256 };
257
258 static const struct regulator_ops mt6397_volt_fixed_ops = {
259 .list_voltage = regulator_list_voltage_linear,
260 .enable = regulator_enable_regmap,
261 .disable = regulator_disable_regmap,
262 .is_enabled = regulator_is_enabled_regmap,
263 .get_status = mt6397_get_status,
264 };
265
266 /* The array is indexed by id(MT6397_ID_XXX) */
267 static struct mt6397_regulator_info mt6397_regulators[] = {
268 MT6397_BUCK("buck_vpca15", VPCA15, 700000, 1493750, 6250,
269 buck_volt_range1, MT6397_VCA15_CON7, MT6397_VCA15_CON9, 0x7f,
270 MT6397_VCA15_CON10, MT6397_VCA15_CON5, MT6397_VCA15_CON2, 11),
271 MT6397_BUCK("buck_vpca7", VPCA7, 700000, 1493750, 6250,
272 buck_volt_range1, MT6397_VPCA7_CON7, MT6397_VPCA7_CON9, 0x7f,
273 MT6397_VPCA7_CON10, MT6397_VPCA7_CON5, MT6397_VPCA7_CON2, 8),
274 MT6397_BUCK("buck_vsramca15", VSRAMCA15, 700000, 1493750, 6250,
275 buck_volt_range1, MT6397_VSRMCA15_CON7, MT6397_VSRMCA15_CON9,
276 0x7f, MT6397_VSRMCA15_CON10, MT6397_VSRMCA15_CON5,
277 MT6397_VSRMCA15_CON2, 8),
278 MT6397_BUCK("buck_vsramca7", VSRAMCA7, 700000, 1493750, 6250,
279 buck_volt_range1, MT6397_VSRMCA7_CON7, MT6397_VSRMCA7_CON9,
280 0x7f, MT6397_VSRMCA7_CON10, MT6397_VSRMCA7_CON5,
281 MT6397_VSRMCA7_CON2, 8),
282 MT6397_BUCK("buck_vcore", VCORE, 700000, 1493750, 6250,
283 buck_volt_range1, MT6397_VCORE_CON7, MT6397_VCORE_CON9, 0x7f,
284 MT6397_VCORE_CON10, MT6397_VCORE_CON5, MT6397_VCORE_CON2, 8),
285 MT6397_BUCK("buck_vgpu", VGPU, 700000, 1493750, 6250, buck_volt_range1,
286 MT6397_VGPU_CON7, MT6397_VGPU_CON9, 0x7f,
287 MT6397_VGPU_CON10, MT6397_VGPU_CON5, MT6397_VGPU_CON2, 8),
288 MT6397_BUCK("buck_vdrm", VDRM, 800000, 1593750, 6250, buck_volt_range2,
289 MT6397_VDRM_CON7, MT6397_VDRM_CON9, 0x7f,
290 MT6397_VDRM_CON10, MT6397_VDRM_CON5, MT6397_VDRM_CON2, 8),
291 MT6397_BUCK("buck_vio18", VIO18, 1500000, 2120000, 20000,
292 buck_volt_range3, MT6397_VIO18_CON7, MT6397_VIO18_CON9, 0x1f,
293 MT6397_VIO18_CON10, MT6397_VIO18_CON5, MT6397_VIO18_CON2, 8),
294 MT6397_REG_FIXED("ldo_vtcxo", VTCXO, MT6397_ANALDO_CON0, 10, 2800000),
295 MT6397_REG_FIXED("ldo_va28", VA28, MT6397_ANALDO_CON1, 14, 2800000),
296 MT6397_LDO("ldo_vcama", VCAMA, ldo_volt_table1,
297 MT6397_ANALDO_CON2, 15, MT6397_ANALDO_CON6, 0xC0),
298 MT6397_REG_FIXED("ldo_vio28", VIO28, MT6397_DIGLDO_CON0, 14, 2800000),
299 MT6397_REG_FIXED("ldo_vusb", VUSB, MT6397_DIGLDO_CON1, 14, 3300000),
300 MT6397_LDO("ldo_vmc", VMC, ldo_volt_table2,
301 MT6397_DIGLDO_CON2, 12, MT6397_DIGLDO_CON29, 0x10),
302 MT6397_LDO("ldo_vmch", VMCH, ldo_volt_table3,
303 MT6397_DIGLDO_CON3, 14, MT6397_DIGLDO_CON17, 0x80),
304 MT6397_LDO("ldo_vemc3v3", VEMC3V3, ldo_volt_table3,
305 MT6397_DIGLDO_CON4, 14, MT6397_DIGLDO_CON18, 0x10),
306 MT6397_LDO("ldo_vgp1", VGP1, ldo_volt_table4,
307 MT6397_DIGLDO_CON5, 15, MT6397_DIGLDO_CON19, 0xE0),
308 MT6397_LDO("ldo_vgp2", VGP2, ldo_volt_table5,
309 MT6397_DIGLDO_CON6, 15, MT6397_DIGLDO_CON20, 0xE0),
310 MT6397_LDO("ldo_vgp3", VGP3, ldo_volt_table5,
311 MT6397_DIGLDO_CON7, 15, MT6397_DIGLDO_CON21, 0xE0),
312 MT6397_LDO("ldo_vgp4", VGP4, ldo_volt_table5,
313 MT6397_DIGLDO_CON8, 15, MT6397_DIGLDO_CON22, 0xE0),
314 MT6397_LDO("ldo_vgp5", VGP5, ldo_volt_table6,
315 MT6397_DIGLDO_CON9, 15, MT6397_DIGLDO_CON23, 0xE0),
316 MT6397_LDO("ldo_vgp6", VGP6, ldo_volt_table5,
317 MT6397_DIGLDO_CON10, 15, MT6397_DIGLDO_CON33, 0xE0),
318 MT6397_LDO("ldo_vibr", VIBR, ldo_volt_table7,
319 MT6397_DIGLDO_CON24, 15, MT6397_DIGLDO_CON25, 0xE00),
320 };
321
mt6397_set_buck_vosel_reg(struct platform_device * pdev)322 static int mt6397_set_buck_vosel_reg(struct platform_device *pdev)
323 {
324 struct mt6397_chip *mt6397 = dev_get_drvdata(pdev->dev.parent);
325 int i;
326 u32 regval;
327
328 for (i = 0; i < MT6397_MAX_REGULATOR; i++) {
329 if (mt6397_regulators[i].vselctrl_reg) {
330 if (regmap_read(mt6397->regmap,
331 mt6397_regulators[i].vselctrl_reg,
332 ®val) < 0) {
333 dev_err(&pdev->dev,
334 "Failed to read buck ctrl\n");
335 return -EIO;
336 }
337
338 if (regval & mt6397_regulators[i].vselctrl_mask) {
339 mt6397_regulators[i].desc.vsel_reg =
340 mt6397_regulators[i].vselon_reg;
341 }
342 }
343 }
344
345 return 0;
346 }
347
mt6397_regulator_probe(struct platform_device * pdev)348 static int mt6397_regulator_probe(struct platform_device *pdev)
349 {
350 struct mt6397_chip *mt6397 = dev_get_drvdata(pdev->dev.parent);
351 struct regulator_config config = {};
352 struct regulator_dev *rdev;
353 int i;
354 u32 reg_value, version;
355
356 /* Query buck controller to select activated voltage register part */
357 if (mt6397_set_buck_vosel_reg(pdev))
358 return -EIO;
359
360 /* Read PMIC chip revision to update constraints and voltage table */
361 if (regmap_read(mt6397->regmap, MT6397_CID, ®_value) < 0) {
362 dev_err(&pdev->dev, "Failed to read Chip ID\n");
363 return -EIO;
364 }
365 dev_info(&pdev->dev, "Chip ID = 0x%x\n", reg_value);
366
367 version = (reg_value & 0xFF);
368 switch (version) {
369 case MT6397_REGULATOR_ID91:
370 mt6397_regulators[MT6397_ID_VGP2].desc.volt_table =
371 ldo_volt_table5_v2;
372 break;
373 default:
374 break;
375 }
376
377 for (i = 0; i < MT6397_MAX_REGULATOR; i++) {
378 config.dev = &pdev->dev;
379 config.driver_data = &mt6397_regulators[i];
380 config.regmap = mt6397->regmap;
381 rdev = devm_regulator_register(&pdev->dev,
382 &mt6397_regulators[i].desc, &config);
383 if (IS_ERR(rdev)) {
384 dev_err(&pdev->dev, "failed to register %s\n",
385 mt6397_regulators[i].desc.name);
386 return PTR_ERR(rdev);
387 }
388 }
389
390 return 0;
391 }
392
393 static const struct platform_device_id mt6397_platform_ids[] = {
394 {"mt6397-regulator", 0},
395 { /* sentinel */ },
396 };
397 MODULE_DEVICE_TABLE(platform, mt6397_platform_ids);
398
399 static const struct of_device_id mt6397_of_match[] = {
400 { .compatible = "mediatek,mt6397-regulator", },
401 { /* sentinel */ },
402 };
403 MODULE_DEVICE_TABLE(of, mt6397_of_match);
404
405 static struct platform_driver mt6397_regulator_driver = {
406 .driver = {
407 .name = "mt6397-regulator",
408 .of_match_table = of_match_ptr(mt6397_of_match),
409 },
410 .probe = mt6397_regulator_probe,
411 .id_table = mt6397_platform_ids,
412 };
413
414 module_platform_driver(mt6397_regulator_driver);
415
416 MODULE_AUTHOR("Flora Fu <flora.fu@mediatek.com>");
417 MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6397 PMIC");
418 MODULE_LICENSE("GPL");
419