1 /*
2  * Copyright (c) 2016 MediaTek Inc.
3  * Author: Chen Zhong <chen.zhong@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 
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14 #include <linux/mfd/mt6397/core.h>
15 #include <linux/mfd/mt6323/registers.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/regulator/machine.h>
18 #include <linux/regulator/mt6323-regulator.h>
19 #include <linux/regulator/of_regulator.h>
20 
21 #define MT6323_LDO_MODE_NORMAL	0
22 #define MT6323_LDO_MODE_LP	1
23 
24 /*
25  * MT6323 regulators' information
26  *
27  * @desc: standard fields of regulator description.
28  * @qi: Mask for query enable signal status of regulators
29  * @vselon_reg: Register sections for hardware control mode of bucks
30  * @vselctrl_reg: Register for controlling the buck control mode.
31  * @vselctrl_mask: Mask for query buck's voltage control mode.
32  */
33 struct mt6323_regulator_info {
34 	struct regulator_desc desc;
35 	u32 qi;
36 	u32 vselon_reg;
37 	u32 vselctrl_reg;
38 	u32 vselctrl_mask;
39 	u32 modeset_reg;
40 	u32 modeset_mask;
41 };
42 
43 #define MT6323_BUCK(match, vreg, min, max, step, volt_ranges, enreg,	\
44 		vosel, vosel_mask, voselon, vosel_ctrl)			\
45 [MT6323_ID_##vreg] = {							\
46 	.desc = {							\
47 		.name = #vreg,						\
48 		.of_match = of_match_ptr(match),			\
49 		.ops = &mt6323_volt_range_ops,				\
50 		.type = REGULATOR_VOLTAGE,				\
51 		.id = MT6323_ID_##vreg,					\
52 		.owner = THIS_MODULE,					\
53 		.n_voltages = (max - min)/step + 1,			\
54 		.linear_ranges = volt_ranges,				\
55 		.n_linear_ranges = ARRAY_SIZE(volt_ranges),		\
56 		.vsel_reg = vosel,					\
57 		.vsel_mask = vosel_mask,				\
58 		.enable_reg = enreg,					\
59 		.enable_mask = BIT(0),					\
60 	},								\
61 	.qi = BIT(13),							\
62 	.vselon_reg = voselon,						\
63 	.vselctrl_reg = vosel_ctrl,					\
64 	.vselctrl_mask = BIT(1),					\
65 }
66 
67 #define MT6323_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel,	\
68 		vosel_mask, _modeset_reg, _modeset_mask)		\
69 [MT6323_ID_##vreg] = {							\
70 	.desc = {							\
71 		.name = #vreg,						\
72 		.of_match = of_match_ptr(match),			\
73 		.ops = &mt6323_volt_table_ops,				\
74 		.type = REGULATOR_VOLTAGE,				\
75 		.id = MT6323_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 	.modeset_reg = _modeset_reg,					\
86 	.modeset_mask = _modeset_mask,					\
87 }
88 
89 #define MT6323_REG_FIXED(match, vreg, enreg, enbit, volt,		\
90 		_modeset_reg, _modeset_mask)				\
91 [MT6323_ID_##vreg] = {							\
92 	.desc = {							\
93 		.name = #vreg,						\
94 		.of_match = of_match_ptr(match),			\
95 		.ops = &mt6323_volt_fixed_ops,				\
96 		.type = REGULATOR_VOLTAGE,				\
97 		.id = MT6323_ID_##vreg,					\
98 		.owner = THIS_MODULE,					\
99 		.n_voltages = 1,					\
100 		.enable_reg = enreg,					\
101 		.enable_mask = BIT(enbit),				\
102 		.min_uV = volt,						\
103 	},								\
104 	.qi = BIT(15),							\
105 	.modeset_reg = _modeset_reg,					\
106 	.modeset_mask = _modeset_mask,					\
107 }
108 
109 static const struct regulator_linear_range buck_volt_range1[] = {
110 	REGULATOR_LINEAR_RANGE(700000, 0, 0x7f, 6250),
111 };
112 
113 static const struct regulator_linear_range buck_volt_range2[] = {
114 	REGULATOR_LINEAR_RANGE(1400000, 0, 0x7f, 12500),
115 };
116 
117 static const struct regulator_linear_range buck_volt_range3[] = {
118 	REGULATOR_LINEAR_RANGE(500000, 0, 0x3f, 50000),
119 };
120 
121 static const u32 ldo_volt_table1[] = {
122 	3300000, 3400000, 3500000, 3600000,
123 };
124 
125 static const u32 ldo_volt_table2[] = {
126 	1500000, 1800000, 2500000, 2800000,
127 };
128 
129 static const u32 ldo_volt_table3[] = {
130 	1800000, 3300000,
131 };
132 
133 static const u32 ldo_volt_table4[] = {
134 	3000000, 3300000,
135 };
136 
137 static const u32 ldo_volt_table5[] = {
138 	1200000, 1300000, 1500000, 1800000, 2000000, 2800000, 3000000, 3300000,
139 };
140 
141 static const u32 ldo_volt_table6[] = {
142 	1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 2000000,
143 };
144 
145 static const u32 ldo_volt_table7[] = {
146 	1200000, 1300000, 1500000, 1800000,
147 };
148 
149 static const u32 ldo_volt_table8[] = {
150 	1800000, 3000000,
151 };
152 
153 static const u32 ldo_volt_table9[] = {
154 	1200000, 1350000, 1500000, 1800000,
155 };
156 
157 static const u32 ldo_volt_table10[] = {
158 	1200000, 1300000, 1500000, 1800000,
159 };
160 
mt6323_get_status(struct regulator_dev * rdev)161 static int mt6323_get_status(struct regulator_dev *rdev)
162 {
163 	int ret;
164 	u32 regval;
165 	struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
166 
167 	ret = regmap_read(rdev->regmap, info->desc.enable_reg, &regval);
168 	if (ret != 0) {
169 		dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
170 		return ret;
171 	}
172 
173 	return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
174 }
175 
mt6323_ldo_set_mode(struct regulator_dev * rdev,unsigned int mode)176 static int mt6323_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
177 {
178 	int ret, val = 0;
179 	struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
180 
181 	if (!info->modeset_mask) {
182 		dev_err(&rdev->dev, "regulator %s doesn't support set_mode\n",
183 			info->desc.name);
184 		return -EINVAL;
185 	}
186 
187 	switch (mode) {
188 	case REGULATOR_MODE_STANDBY:
189 		val = MT6323_LDO_MODE_LP;
190 		break;
191 	case REGULATOR_MODE_NORMAL:
192 		val = MT6323_LDO_MODE_NORMAL;
193 		break;
194 	default:
195 		return -EINVAL;
196 	}
197 
198 	val <<= ffs(info->modeset_mask) - 1;
199 
200 	ret = regmap_update_bits(rdev->regmap, info->modeset_reg,
201 				  info->modeset_mask, val);
202 
203 	return ret;
204 }
205 
mt6323_ldo_get_mode(struct regulator_dev * rdev)206 static unsigned int mt6323_ldo_get_mode(struct regulator_dev *rdev)
207 {
208 	unsigned int val;
209 	unsigned int mode;
210 	int ret;
211 	struct mt6323_regulator_info *info = rdev_get_drvdata(rdev);
212 
213 	if (!info->modeset_mask) {
214 		dev_err(&rdev->dev, "regulator %s doesn't support get_mode\n",
215 			info->desc.name);
216 		return -EINVAL;
217 	}
218 
219 	ret = regmap_read(rdev->regmap, info->modeset_reg, &val);
220 	if (ret < 0)
221 		return ret;
222 
223 	val &= info->modeset_mask;
224 	val >>= ffs(info->modeset_mask) - 1;
225 
226 	if (val & 0x1)
227 		mode = REGULATOR_MODE_STANDBY;
228 	else
229 		mode = REGULATOR_MODE_NORMAL;
230 
231 	return mode;
232 }
233 
234 static const struct regulator_ops mt6323_volt_range_ops = {
235 	.list_voltage = regulator_list_voltage_linear_range,
236 	.map_voltage = regulator_map_voltage_linear_range,
237 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
238 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
239 	.set_voltage_time_sel = regulator_set_voltage_time_sel,
240 	.enable = regulator_enable_regmap,
241 	.disable = regulator_disable_regmap,
242 	.is_enabled = regulator_is_enabled_regmap,
243 	.get_status = mt6323_get_status,
244 };
245 
246 static const struct regulator_ops mt6323_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 = mt6323_get_status,
256 	.set_mode = mt6323_ldo_set_mode,
257 	.get_mode = mt6323_ldo_get_mode,
258 };
259 
260 static const struct regulator_ops mt6323_volt_fixed_ops = {
261 	.list_voltage = regulator_list_voltage_linear,
262 	.enable = regulator_enable_regmap,
263 	.disable = regulator_disable_regmap,
264 	.is_enabled = regulator_is_enabled_regmap,
265 	.get_status = mt6323_get_status,
266 	.set_mode = mt6323_ldo_set_mode,
267 	.get_mode = mt6323_ldo_get_mode,
268 };
269 
270 /* The array is indexed by id(MT6323_ID_XXX) */
271 static struct mt6323_regulator_info mt6323_regulators[] = {
272 	MT6323_BUCK("buck_vproc", VPROC, 700000, 1493750, 6250,
273 		buck_volt_range1, MT6323_VPROC_CON7, MT6323_VPROC_CON9, 0x7f,
274 		MT6323_VPROC_CON10, MT6323_VPROC_CON5),
275 	MT6323_BUCK("buck_vsys", VSYS, 1400000, 2987500, 12500,
276 		buck_volt_range2, MT6323_VSYS_CON7, MT6323_VSYS_CON9, 0x7f,
277 		MT6323_VSYS_CON10, MT6323_VSYS_CON5),
278 	MT6323_BUCK("buck_vpa", VPA, 500000, 3650000, 50000,
279 		buck_volt_range3, MT6323_VPA_CON7, MT6323_VPA_CON9,
280 		0x3f, MT6323_VPA_CON10, MT6323_VPA_CON5),
281 	MT6323_REG_FIXED("ldo_vtcxo", VTCXO, MT6323_ANALDO_CON1, 10, 2800000,
282 		MT6323_ANALDO_CON1, 0x2),
283 	MT6323_REG_FIXED("ldo_vcn28", VCN28, MT6323_ANALDO_CON19, 12, 2800000,
284 		MT6323_ANALDO_CON20, 0x2),
285 	MT6323_LDO("ldo_vcn33_bt", VCN33_BT, ldo_volt_table1,
286 		MT6323_ANALDO_CON16, 7, MT6323_ANALDO_CON16, 0xC,
287 		MT6323_ANALDO_CON21, 0x2),
288 	MT6323_LDO("ldo_vcn33_wifi", VCN33_WIFI, ldo_volt_table1,
289 		MT6323_ANALDO_CON17, 12, MT6323_ANALDO_CON16, 0xC,
290 		MT6323_ANALDO_CON21, 0x2),
291 	MT6323_REG_FIXED("ldo_va", VA, MT6323_ANALDO_CON2, 14, 2800000,
292 		MT6323_ANALDO_CON2, 0x2),
293 	MT6323_LDO("ldo_vcama", VCAMA, ldo_volt_table2,
294 		MT6323_ANALDO_CON4, 15, MT6323_ANALDO_CON10, 0x60, -1, 0),
295 	MT6323_REG_FIXED("ldo_vio28", VIO28, MT6323_DIGLDO_CON0, 14, 2800000,
296 		MT6323_DIGLDO_CON0, 0x2),
297 	MT6323_REG_FIXED("ldo_vusb", VUSB, MT6323_DIGLDO_CON2, 14, 3300000,
298 		MT6323_DIGLDO_CON2, 0x2),
299 	MT6323_LDO("ldo_vmc", VMC, ldo_volt_table3,
300 		MT6323_DIGLDO_CON3, 12, MT6323_DIGLDO_CON24, 0x10,
301 		MT6323_DIGLDO_CON3, 0x2),
302 	MT6323_LDO("ldo_vmch", VMCH, ldo_volt_table4,
303 		MT6323_DIGLDO_CON5, 14, MT6323_DIGLDO_CON26, 0x80,
304 		MT6323_DIGLDO_CON5, 0x2),
305 	MT6323_LDO("ldo_vemc3v3", VEMC3V3, ldo_volt_table4,
306 		MT6323_DIGLDO_CON6, 14, MT6323_DIGLDO_CON27, 0x80,
307 		MT6323_DIGLDO_CON6, 0x2),
308 	MT6323_LDO("ldo_vgp1", VGP1, ldo_volt_table5,
309 		MT6323_DIGLDO_CON7, 15, MT6323_DIGLDO_CON28, 0xE0,
310 		MT6323_DIGLDO_CON7, 0x2),
311 	MT6323_LDO("ldo_vgp2", VGP2, ldo_volt_table6,
312 		MT6323_DIGLDO_CON8, 15, MT6323_DIGLDO_CON29, 0xE0,
313 		MT6323_DIGLDO_CON8, 0x2),
314 	MT6323_LDO("ldo_vgp3", VGP3, ldo_volt_table7,
315 		MT6323_DIGLDO_CON9, 15, MT6323_DIGLDO_CON30, 0x60,
316 		MT6323_DIGLDO_CON9, 0x2),
317 	MT6323_REG_FIXED("ldo_vcn18", VCN18, MT6323_DIGLDO_CON11, 14, 1800000,
318 		MT6323_DIGLDO_CON11, 0x2),
319 	MT6323_LDO("ldo_vsim1", VSIM1, ldo_volt_table8,
320 		MT6323_DIGLDO_CON13, 15, MT6323_DIGLDO_CON34, 0x20,
321 		MT6323_DIGLDO_CON13, 0x2),
322 	MT6323_LDO("ldo_vsim2", VSIM2, ldo_volt_table8,
323 		MT6323_DIGLDO_CON14, 15, MT6323_DIGLDO_CON35, 0x20,
324 		MT6323_DIGLDO_CON14, 0x2),
325 	MT6323_REG_FIXED("ldo_vrtc", VRTC, MT6323_DIGLDO_CON15, 8, 2800000,
326 		-1, 0),
327 	MT6323_LDO("ldo_vcamaf", VCAMAF, ldo_volt_table5,
328 		MT6323_DIGLDO_CON31, 15, MT6323_DIGLDO_CON32, 0xE0,
329 		MT6323_DIGLDO_CON31, 0x2),
330 	MT6323_LDO("ldo_vibr", VIBR, ldo_volt_table5,
331 		MT6323_DIGLDO_CON39, 15, MT6323_DIGLDO_CON40, 0xE0,
332 		MT6323_DIGLDO_CON39, 0x2),
333 	MT6323_REG_FIXED("ldo_vrf18", VRF18, MT6323_DIGLDO_CON45, 15, 1825000,
334 		MT6323_DIGLDO_CON45, 0x2),
335 	MT6323_LDO("ldo_vm", VM, ldo_volt_table9,
336 		MT6323_DIGLDO_CON47, 14, MT6323_DIGLDO_CON48, 0x30,
337 		MT6323_DIGLDO_CON47, 0x2),
338 	MT6323_REG_FIXED("ldo_vio18", VIO18, MT6323_DIGLDO_CON49, 14, 1800000,
339 		MT6323_DIGLDO_CON49, 0x2),
340 	MT6323_LDO("ldo_vcamd", VCAMD, ldo_volt_table10,
341 		MT6323_DIGLDO_CON51, 14, MT6323_DIGLDO_CON52, 0x60,
342 		MT6323_DIGLDO_CON51, 0x2),
343 	MT6323_REG_FIXED("ldo_vcamio", VCAMIO, MT6323_DIGLDO_CON53, 14, 1800000,
344 		MT6323_DIGLDO_CON53, 0x2),
345 };
346 
mt6323_set_buck_vosel_reg(struct platform_device * pdev)347 static int mt6323_set_buck_vosel_reg(struct platform_device *pdev)
348 {
349 	struct mt6397_chip *mt6323 = dev_get_drvdata(pdev->dev.parent);
350 	int i;
351 	u32 regval;
352 
353 	for (i = 0; i < MT6323_MAX_REGULATOR; i++) {
354 		if (mt6323_regulators[i].vselctrl_reg) {
355 			if (regmap_read(mt6323->regmap,
356 				mt6323_regulators[i].vselctrl_reg,
357 				&regval) < 0) {
358 				dev_err(&pdev->dev,
359 					"Failed to read buck ctrl\n");
360 				return -EIO;
361 			}
362 
363 			if (regval & mt6323_regulators[i].vselctrl_mask) {
364 				mt6323_regulators[i].desc.vsel_reg =
365 				mt6323_regulators[i].vselon_reg;
366 			}
367 		}
368 	}
369 
370 	return 0;
371 }
372 
mt6323_regulator_probe(struct platform_device * pdev)373 static int mt6323_regulator_probe(struct platform_device *pdev)
374 {
375 	struct mt6397_chip *mt6323 = dev_get_drvdata(pdev->dev.parent);
376 	struct regulator_config config = {};
377 	struct regulator_dev *rdev;
378 	int i;
379 	u32 reg_value;
380 
381 	/* Query buck controller to select activated voltage register part */
382 	if (mt6323_set_buck_vosel_reg(pdev))
383 		return -EIO;
384 
385 	/* Read PMIC chip revision to update constraints and voltage table */
386 	if (regmap_read(mt6323->regmap, MT6323_CID, &reg_value) < 0) {
387 		dev_err(&pdev->dev, "Failed to read Chip ID\n");
388 		return -EIO;
389 	}
390 	dev_info(&pdev->dev, "Chip ID = 0x%x\n", reg_value);
391 
392 	for (i = 0; i < MT6323_MAX_REGULATOR; i++) {
393 		config.dev = &pdev->dev;
394 		config.driver_data = &mt6323_regulators[i];
395 		config.regmap = mt6323->regmap;
396 		rdev = devm_regulator_register(&pdev->dev,
397 				&mt6323_regulators[i].desc, &config);
398 		if (IS_ERR(rdev)) {
399 			dev_err(&pdev->dev, "failed to register %s\n",
400 				mt6323_regulators[i].desc.name);
401 			return PTR_ERR(rdev);
402 		}
403 	}
404 	return 0;
405 }
406 
407 static const struct platform_device_id mt6323_platform_ids[] = {
408 	{"mt6323-regulator", 0},
409 	{ /* sentinel */ },
410 };
411 MODULE_DEVICE_TABLE(platform, mt6323_platform_ids);
412 
413 static struct platform_driver mt6323_regulator_driver = {
414 	.driver = {
415 		.name = "mt6323-regulator",
416 	},
417 	.probe = mt6323_regulator_probe,
418 	.id_table = mt6323_platform_ids,
419 };
420 
421 module_platform_driver(mt6323_regulator_driver);
422 
423 MODULE_AUTHOR("Chen Zhong <chen.zhong@mediatek.com>");
424 MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6323 PMIC");
425 MODULE_LICENSE("GPL v2");
426