1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2016 MediaTek Inc.
4 // Author: Chen Zhong <chen.zhong@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/mt6323/registers.h>
12 #include <linux/regulator/driver.h>
13 #include <linux/regulator/machine.h>
14 #include <linux/regulator/mt6323-regulator.h>
15 #include <linux/regulator/of_regulator.h>
16 
17 #define MT6323_LDO_MODE_NORMAL	0
18 #define MT6323_LDO_MODE_LP	1
19 
20 /*
21  * MT6323 regulators' information
22  *
23  * @desc: standard fields of regulator description.
24  * @qi: Mask for query enable signal status of regulators
25  * @vselon_reg: Register sections for hardware control mode of bucks
26  * @vselctrl_reg: Register for controlling the buck control mode.
27  * @vselctrl_mask: Mask for query buck's voltage control mode.
28  */
29 struct mt6323_regulator_info {
30 	struct regulator_desc desc;
31 	u32 qi;
32 	u32 vselon_reg;
33 	u32 vselctrl_reg;
34 	u32 vselctrl_mask;
35 	u32 modeset_reg;
36 	u32 modeset_mask;
37 };
38 
39 #define MT6323_BUCK(match, vreg, min, max, step, volt_ranges, enreg,	\
40 		vosel, vosel_mask, voselon, vosel_ctrl)			\
41 [MT6323_ID_##vreg] = {							\
42 	.desc = {							\
43 		.name = #vreg,						\
44 		.of_match = of_match_ptr(match),			\
45 		.ops = &mt6323_volt_range_ops,				\
46 		.type = REGULATOR_VOLTAGE,				\
47 		.id = MT6323_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 	},								\
57 	.qi = BIT(13),							\
58 	.vselon_reg = voselon,						\
59 	.vselctrl_reg = vosel_ctrl,					\
60 	.vselctrl_mask = BIT(1),					\
61 }
62 
63 #define MT6323_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel,	\
64 		vosel_mask, _modeset_reg, _modeset_mask)		\
65 [MT6323_ID_##vreg] = {							\
66 	.desc = {							\
67 		.name = #vreg,						\
68 		.of_match = of_match_ptr(match),			\
69 		.ops = &mt6323_volt_table_ops,				\
70 		.type = REGULATOR_VOLTAGE,				\
71 		.id = MT6323_ID_##vreg,					\
72 		.owner = THIS_MODULE,					\
73 		.n_voltages = ARRAY_SIZE(ldo_volt_table),		\
74 		.volt_table = ldo_volt_table,				\
75 		.vsel_reg = vosel,					\
76 		.vsel_mask = vosel_mask,				\
77 		.enable_reg = enreg,					\
78 		.enable_mask = BIT(enbit),				\
79 	},								\
80 	.qi = BIT(15),							\
81 	.modeset_reg = _modeset_reg,					\
82 	.modeset_mask = _modeset_mask,					\
83 }
84 
85 #define MT6323_REG_FIXED(match, vreg, enreg, enbit, volt,		\
86 		_modeset_reg, _modeset_mask)				\
87 [MT6323_ID_##vreg] = {							\
88 	.desc = {							\
89 		.name = #vreg,						\
90 		.of_match = of_match_ptr(match),			\
91 		.ops = &mt6323_volt_fixed_ops,				\
92 		.type = REGULATOR_VOLTAGE,				\
93 		.id = MT6323_ID_##vreg,					\
94 		.owner = THIS_MODULE,					\
95 		.n_voltages = 1,					\
96 		.enable_reg = enreg,					\
97 		.enable_mask = BIT(enbit),				\
98 		.min_uV = volt,						\
99 	},								\
100 	.qi = BIT(15),							\
101 	.modeset_reg = _modeset_reg,					\
102 	.modeset_mask = _modeset_mask,					\
103 }
104 
105 static const struct linear_range buck_volt_range1[] = {
106 	REGULATOR_LINEAR_RANGE(700000, 0, 0x7f, 6250),
107 };
108 
109 static const struct linear_range buck_volt_range2[] = {
110 	REGULATOR_LINEAR_RANGE(1400000, 0, 0x7f, 12500),
111 };
112 
113 static const struct linear_range buck_volt_range3[] = {
114 	REGULATOR_LINEAR_RANGE(500000, 0, 0x3f, 50000),
115 };
116 
117 static const unsigned int ldo_volt_table1[] = {
118 	3300000, 3400000, 3500000, 3600000,
119 };
120 
121 static const unsigned int ldo_volt_table2[] = {
122 	1500000, 1800000, 2500000, 2800000,
123 };
124 
125 static const unsigned int ldo_volt_table3[] = {
126 	1800000, 3300000,
127 };
128 
129 static const unsigned int ldo_volt_table4[] = {
130 	3000000, 3300000,
131 };
132 
133 static const unsigned int ldo_volt_table5[] = {
134 	1200000, 1300000, 1500000, 1800000, 2000000, 2800000, 3000000, 3300000,
135 };
136 
137 static const unsigned int ldo_volt_table6[] = {
138 	1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 2000000,
139 };
140 
141 static const unsigned int ldo_volt_table7[] = {
142 	1200000, 1300000, 1500000, 1800000,
143 };
144 
145 static const unsigned int ldo_volt_table8[] = {
146 	1800000, 3000000,
147 };
148 
149 static const unsigned int ldo_volt_table9[] = {
150 	1200000, 1350000, 1500000, 1800000,
151 };
152 
153 static const unsigned int ldo_volt_table10[] = {
154 	1200000, 1300000, 1500000, 1800000,
155 };
156 
157 static int mt6323_get_status(struct regulator_dev *rdev)
158 {
159 	int ret;
160 	u32 regval;
161 	struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
162 
163 	ret = regmap_read(rdev->regmap, info->desc.enable_reg, &regval);
164 	if (ret != 0) {
165 		dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
166 		return ret;
167 	}
168 
169 	return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
170 }
171 
172 static int mt6323_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
173 {
174 	int ret, val = 0;
175 	struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
176 
177 	if (!info->modeset_mask) {
178 		dev_err(&rdev->dev, "regulator %s doesn't support set_mode\n",
179 			info->desc.name);
180 		return -EINVAL;
181 	}
182 
183 	switch (mode) {
184 	case REGULATOR_MODE_STANDBY:
185 		val = MT6323_LDO_MODE_LP;
186 		break;
187 	case REGULATOR_MODE_NORMAL:
188 		val = MT6323_LDO_MODE_NORMAL;
189 		break;
190 	default:
191 		return -EINVAL;
192 	}
193 
194 	val <<= ffs(info->modeset_mask) - 1;
195 
196 	ret = regmap_update_bits(rdev->regmap, info->modeset_reg,
197 				  info->modeset_mask, val);
198 
199 	return ret;
200 }
201 
202 static unsigned int mt6323_ldo_get_mode(struct regulator_dev *rdev)
203 {
204 	unsigned int val;
205 	unsigned int mode;
206 	int ret;
207 	struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
208 
209 	if (!info->modeset_mask) {
210 		dev_err(&rdev->dev, "regulator %s doesn't support get_mode\n",
211 			info->desc.name);
212 		return -EINVAL;
213 	}
214 
215 	ret = regmap_read(rdev->regmap, info->modeset_reg, &val);
216 	if (ret < 0)
217 		return ret;
218 
219 	val &= info->modeset_mask;
220 	val >>= ffs(info->modeset_mask) - 1;
221 
222 	if (val & 0x1)
223 		mode = REGULATOR_MODE_STANDBY;
224 	else
225 		mode = REGULATOR_MODE_NORMAL;
226 
227 	return mode;
228 }
229 
230 static const struct regulator_ops mt6323_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 = mt6323_get_status,
240 };
241 
242 static const struct regulator_ops mt6323_volt_table_ops = {
243 	.list_voltage = regulator_list_voltage_table,
244 	.map_voltage = regulator_map_voltage_iterate,
245 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
246 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
247 	.set_voltage_time_sel = regulator_set_voltage_time_sel,
248 	.enable = regulator_enable_regmap,
249 	.disable = regulator_disable_regmap,
250 	.is_enabled = regulator_is_enabled_regmap,
251 	.get_status = mt6323_get_status,
252 	.set_mode = mt6323_ldo_set_mode,
253 	.get_mode = mt6323_ldo_get_mode,
254 };
255 
256 static const struct regulator_ops mt6323_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 = mt6323_get_status,
262 	.set_mode = mt6323_ldo_set_mode,
263 	.get_mode = mt6323_ldo_get_mode,
264 };
265 
266 /* The array is indexed by id(MT6323_ID_XXX) */
267 static struct mt6323_regulator_info mt6323_regulators[] = {
268 	MT6323_BUCK("buck_vproc", VPROC, 700000, 1493750, 6250,
269 		buck_volt_range1, MT6323_VPROC_CON7, MT6323_VPROC_CON9, 0x7f,
270 		MT6323_VPROC_CON10, MT6323_VPROC_CON5),
271 	MT6323_BUCK("buck_vsys", VSYS, 1400000, 2987500, 12500,
272 		buck_volt_range2, MT6323_VSYS_CON7, MT6323_VSYS_CON9, 0x7f,
273 		MT6323_VSYS_CON10, MT6323_VSYS_CON5),
274 	MT6323_BUCK("buck_vpa", VPA, 500000, 3650000, 50000,
275 		buck_volt_range3, MT6323_VPA_CON7, MT6323_VPA_CON9,
276 		0x3f, MT6323_VPA_CON10, MT6323_VPA_CON5),
277 	MT6323_REG_FIXED("ldo_vtcxo", VTCXO, MT6323_ANALDO_CON1, 10, 2800000,
278 		MT6323_ANALDO_CON1, 0x2),
279 	MT6323_REG_FIXED("ldo_vcn28", VCN28, MT6323_ANALDO_CON19, 12, 2800000,
280 		MT6323_ANALDO_CON20, 0x2),
281 	MT6323_LDO("ldo_vcn33_bt", VCN33_BT, ldo_volt_table1,
282 		MT6323_ANALDO_CON16, 7, MT6323_ANALDO_CON16, 0xC,
283 		MT6323_ANALDO_CON21, 0x2),
284 	MT6323_LDO("ldo_vcn33_wifi", VCN33_WIFI, ldo_volt_table1,
285 		MT6323_ANALDO_CON17, 12, MT6323_ANALDO_CON16, 0xC,
286 		MT6323_ANALDO_CON21, 0x2),
287 	MT6323_REG_FIXED("ldo_va", VA, MT6323_ANALDO_CON2, 14, 2800000,
288 		MT6323_ANALDO_CON2, 0x2),
289 	MT6323_LDO("ldo_vcama", VCAMA, ldo_volt_table2,
290 		MT6323_ANALDO_CON4, 15, MT6323_ANALDO_CON10, 0x60, -1, 0),
291 	MT6323_REG_FIXED("ldo_vio28", VIO28, MT6323_DIGLDO_CON0, 14, 2800000,
292 		MT6323_DIGLDO_CON0, 0x2),
293 	MT6323_REG_FIXED("ldo_vusb", VUSB, MT6323_DIGLDO_CON2, 14, 3300000,
294 		MT6323_DIGLDO_CON2, 0x2),
295 	MT6323_LDO("ldo_vmc", VMC, ldo_volt_table3,
296 		MT6323_DIGLDO_CON3, 12, MT6323_DIGLDO_CON24, 0x10,
297 		MT6323_DIGLDO_CON3, 0x2),
298 	MT6323_LDO("ldo_vmch", VMCH, ldo_volt_table4,
299 		MT6323_DIGLDO_CON5, 14, MT6323_DIGLDO_CON26, 0x80,
300 		MT6323_DIGLDO_CON5, 0x2),
301 	MT6323_LDO("ldo_vemc3v3", VEMC3V3, ldo_volt_table4,
302 		MT6323_DIGLDO_CON6, 14, MT6323_DIGLDO_CON27, 0x80,
303 		MT6323_DIGLDO_CON6, 0x2),
304 	MT6323_LDO("ldo_vgp1", VGP1, ldo_volt_table5,
305 		MT6323_DIGLDO_CON7, 15, MT6323_DIGLDO_CON28, 0xE0,
306 		MT6323_DIGLDO_CON7, 0x2),
307 	MT6323_LDO("ldo_vgp2", VGP2, ldo_volt_table6,
308 		MT6323_DIGLDO_CON8, 15, MT6323_DIGLDO_CON29, 0xE0,
309 		MT6323_DIGLDO_CON8, 0x2),
310 	MT6323_LDO("ldo_vgp3", VGP3, ldo_volt_table7,
311 		MT6323_DIGLDO_CON9, 15, MT6323_DIGLDO_CON30, 0x60,
312 		MT6323_DIGLDO_CON9, 0x2),
313 	MT6323_REG_FIXED("ldo_vcn18", VCN18, MT6323_DIGLDO_CON11, 14, 1800000,
314 		MT6323_DIGLDO_CON11, 0x2),
315 	MT6323_LDO("ldo_vsim1", VSIM1, ldo_volt_table8,
316 		MT6323_DIGLDO_CON13, 15, MT6323_DIGLDO_CON34, 0x20,
317 		MT6323_DIGLDO_CON13, 0x2),
318 	MT6323_LDO("ldo_vsim2", VSIM2, ldo_volt_table8,
319 		MT6323_DIGLDO_CON14, 15, MT6323_DIGLDO_CON35, 0x20,
320 		MT6323_DIGLDO_CON14, 0x2),
321 	MT6323_REG_FIXED("ldo_vrtc", VRTC, MT6323_DIGLDO_CON15, 8, 2800000,
322 		-1, 0),
323 	MT6323_LDO("ldo_vcamaf", VCAMAF, ldo_volt_table5,
324 		MT6323_DIGLDO_CON31, 15, MT6323_DIGLDO_CON32, 0xE0,
325 		MT6323_DIGLDO_CON31, 0x2),
326 	MT6323_LDO("ldo_vibr", VIBR, ldo_volt_table5,
327 		MT6323_DIGLDO_CON39, 15, MT6323_DIGLDO_CON40, 0xE0,
328 		MT6323_DIGLDO_CON39, 0x2),
329 	MT6323_REG_FIXED("ldo_vrf18", VRF18, MT6323_DIGLDO_CON45, 15, 1825000,
330 		MT6323_DIGLDO_CON45, 0x2),
331 	MT6323_LDO("ldo_vm", VM, ldo_volt_table9,
332 		MT6323_DIGLDO_CON47, 14, MT6323_DIGLDO_CON48, 0x30,
333 		MT6323_DIGLDO_CON47, 0x2),
334 	MT6323_REG_FIXED("ldo_vio18", VIO18, MT6323_DIGLDO_CON49, 14, 1800000,
335 		MT6323_DIGLDO_CON49, 0x2),
336 	MT6323_LDO("ldo_vcamd", VCAMD, ldo_volt_table10,
337 		MT6323_DIGLDO_CON51, 14, MT6323_DIGLDO_CON52, 0x60,
338 		MT6323_DIGLDO_CON51, 0x2),
339 	MT6323_REG_FIXED("ldo_vcamio", VCAMIO, MT6323_DIGLDO_CON53, 14, 1800000,
340 		MT6323_DIGLDO_CON53, 0x2),
341 };
342 
343 static int mt6323_set_buck_vosel_reg(struct platform_device *pdev)
344 {
345 	struct mt6397_chip *mt6323 = dev_get_drvdata(pdev->dev.parent);
346 	int i;
347 	u32 regval;
348 
349 	for (i = 0; i < MT6323_MAX_REGULATOR; i++) {
350 		if (mt6323_regulators[i].vselctrl_reg) {
351 			if (regmap_read(mt6323->regmap,
352 				mt6323_regulators[i].vselctrl_reg,
353 				&regval) < 0) {
354 				dev_err(&pdev->dev,
355 					"Failed to read buck ctrl\n");
356 				return -EIO;
357 			}
358 
359 			if (regval & mt6323_regulators[i].vselctrl_mask) {
360 				mt6323_regulators[i].desc.vsel_reg =
361 				mt6323_regulators[i].vselon_reg;
362 			}
363 		}
364 	}
365 
366 	return 0;
367 }
368 
369 static int mt6323_regulator_probe(struct platform_device *pdev)
370 {
371 	struct mt6397_chip *mt6323 = dev_get_drvdata(pdev->dev.parent);
372 	struct regulator_config config = {};
373 	struct regulator_dev *rdev;
374 	int i;
375 	u32 reg_value;
376 
377 	/* Query buck controller to select activated voltage register part */
378 	if (mt6323_set_buck_vosel_reg(pdev))
379 		return -EIO;
380 
381 	/* Read PMIC chip revision to update constraints and voltage table */
382 	if (regmap_read(mt6323->regmap, MT6323_CID, &reg_value) < 0) {
383 		dev_err(&pdev->dev, "Failed to read Chip ID\n");
384 		return -EIO;
385 	}
386 	dev_info(&pdev->dev, "Chip ID = 0x%x\n", reg_value);
387 
388 	for (i = 0; i < MT6323_MAX_REGULATOR; i++) {
389 		config.dev = &pdev->dev;
390 		config.driver_data = &mt6323_regulators[i];
391 		config.regmap = mt6323->regmap;
392 		rdev = devm_regulator_register(&pdev->dev,
393 				&mt6323_regulators[i].desc, &config);
394 		if (IS_ERR(rdev)) {
395 			dev_err(&pdev->dev, "failed to register %s\n",
396 				mt6323_regulators[i].desc.name);
397 			return PTR_ERR(rdev);
398 		}
399 	}
400 	return 0;
401 }
402 
403 static const struct platform_device_id mt6323_platform_ids[] = {
404 	{"mt6323-regulator", 0},
405 	{ /* sentinel */ },
406 };
407 MODULE_DEVICE_TABLE(platform, mt6323_platform_ids);
408 
409 static struct platform_driver mt6323_regulator_driver = {
410 	.driver = {
411 		.name = "mt6323-regulator",
412 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
413 	},
414 	.probe = mt6323_regulator_probe,
415 	.id_table = mt6323_platform_ids,
416 };
417 
418 module_platform_driver(mt6323_regulator_driver);
419 
420 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
421 MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6323 PMIC");
422 MODULE_LICENSE("GPL v2");
423