1 // SPDX-License-Identifier: GPL-2.0-only
2 //
3 // Copyright (C) 2020 MediaTek Inc.
4 //
5 // Author: Gene Chen <gene_chen@richtek.com>
6 
7 #include <linux/init.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/of.h>
11 #include <linux/platform_device.h>
12 #include <linux/regmap.h>
13 #include <linux/regulator/driver.h>
14 #include <linux/regulator/machine.h>
15 
16 #include <dt-bindings/regulator/mediatek,mt6360-regulator.h>
17 
18 enum {
19 	MT6360_REGULATOR_BUCK1 = 0,
20 	MT6360_REGULATOR_BUCK2,
21 	MT6360_REGULATOR_LDO6,
22 	MT6360_REGULATOR_LDO7,
23 	MT6360_REGULATOR_LDO1,
24 	MT6360_REGULATOR_LDO2,
25 	MT6360_REGULATOR_LDO3,
26 	MT6360_REGULATOR_LDO5,
27 	MT6360_REGULATOR_MAX,
28 };
29 
30 struct mt6360_irq_mapping {
31 	const char *name;
32 	irq_handler_t handler;
33 };
34 
35 struct mt6360_regulator_desc {
36 	const struct regulator_desc desc;
37 	unsigned int mode_reg;
38 	unsigned int mode_mask;
39 	unsigned int state_reg;
40 	unsigned int state_mask;
41 	const struct mt6360_irq_mapping *irq_tables;
42 	int irq_table_size;
43 };
44 
45 struct mt6360_regulator_data {
46 	struct device *dev;
47 	struct regmap *regmap;
48 };
49 
50 static irqreturn_t mt6360_pgb_event_handler(int irq, void *data)
51 {
52 	struct regulator_dev *rdev = data;
53 
54 	regulator_notifier_call_chain(rdev, REGULATOR_EVENT_FAIL, NULL);
55 	return IRQ_HANDLED;
56 }
57 
58 static irqreturn_t mt6360_oc_event_handler(int irq, void *data)
59 {
60 	struct regulator_dev *rdev = data;
61 
62 	regulator_notifier_call_chain(rdev, REGULATOR_EVENT_OVER_CURRENT, NULL);
63 	return IRQ_HANDLED;
64 }
65 
66 static irqreturn_t mt6360_ov_event_handler(int irq, void *data)
67 {
68 	struct regulator_dev *rdev = data;
69 
70 	regulator_notifier_call_chain(rdev, REGULATOR_EVENT_REGULATION_OUT, NULL);
71 	return IRQ_HANDLED;
72 }
73 
74 static irqreturn_t mt6360_uv_event_handler(int irq, void *data)
75 {
76 	struct regulator_dev *rdev = data;
77 
78 	regulator_notifier_call_chain(rdev, REGULATOR_EVENT_UNDER_VOLTAGE, NULL);
79 	return IRQ_HANDLED;
80 }
81 
82 static const struct mt6360_irq_mapping buck1_irq_tbls[] = {
83 	{ "buck1_pgb_evt", mt6360_pgb_event_handler },
84 	{ "buck1_oc_evt", mt6360_oc_event_handler },
85 	{ "buck1_ov_evt", mt6360_ov_event_handler },
86 	{ "buck1_uv_evt", mt6360_uv_event_handler },
87 };
88 
89 static const struct mt6360_irq_mapping buck2_irq_tbls[] = {
90 	{ "buck2_pgb_evt", mt6360_pgb_event_handler },
91 	{ "buck2_oc_evt", mt6360_oc_event_handler },
92 	{ "buck2_ov_evt", mt6360_ov_event_handler },
93 	{ "buck2_uv_evt", mt6360_uv_event_handler },
94 };
95 
96 static const struct mt6360_irq_mapping ldo6_irq_tbls[] = {
97 	{ "ldo6_pgb_evt", mt6360_pgb_event_handler },
98 	{ "ldo6_oc_evt", mt6360_oc_event_handler },
99 };
100 
101 static const struct mt6360_irq_mapping ldo7_irq_tbls[] = {
102 	{ "ldo7_pgb_evt", mt6360_pgb_event_handler },
103 	{ "ldo7_oc_evt", mt6360_oc_event_handler },
104 };
105 
106 static const struct mt6360_irq_mapping ldo1_irq_tbls[] = {
107 	{ "ldo1_pgb_evt", mt6360_pgb_event_handler },
108 	{ "ldo1_oc_evt", mt6360_oc_event_handler },
109 };
110 
111 static const struct mt6360_irq_mapping ldo2_irq_tbls[] = {
112 	{ "ldo2_pgb_evt", mt6360_pgb_event_handler },
113 	{ "ldo2_oc_evt", mt6360_oc_event_handler },
114 };
115 
116 static const struct mt6360_irq_mapping ldo3_irq_tbls[] = {
117 	{ "ldo3_pgb_evt", mt6360_pgb_event_handler },
118 	{ "ldo3_oc_evt", mt6360_oc_event_handler },
119 };
120 
121 static const struct mt6360_irq_mapping ldo5_irq_tbls[] = {
122 	{ "ldo5_pgb_evt", mt6360_pgb_event_handler },
123 	{ "ldo5_oc_evt", mt6360_oc_event_handler },
124 };
125 
126 static const struct linear_range buck_vout_ranges[] = {
127 	REGULATOR_LINEAR_RANGE(300000, 0x00, 0xc7, 5000),
128 	REGULATOR_LINEAR_RANGE(1300000, 0xc8, 0xff, 0),
129 };
130 
131 static const struct linear_range ldo_vout_ranges1[] = {
132 	REGULATOR_LINEAR_RANGE(500000, 0x00, 0x09, 10000),
133 	REGULATOR_LINEAR_RANGE(600000, 0x0a, 0x10, 0),
134 	REGULATOR_LINEAR_RANGE(610000, 0x11, 0x19, 10000),
135 	REGULATOR_LINEAR_RANGE(700000, 0x1a, 0x20, 0),
136 	REGULATOR_LINEAR_RANGE(710000, 0x21, 0x29, 10000),
137 	REGULATOR_LINEAR_RANGE(800000, 0x2a, 0x30, 0),
138 	REGULATOR_LINEAR_RANGE(810000, 0x31, 0x39, 10000),
139 	REGULATOR_LINEAR_RANGE(900000, 0x3a, 0x40, 0),
140 	REGULATOR_LINEAR_RANGE(910000, 0x41, 0x49, 10000),
141 	REGULATOR_LINEAR_RANGE(1000000, 0x4a, 0x50, 0),
142 	REGULATOR_LINEAR_RANGE(1010000, 0x51, 0x59, 10000),
143 	REGULATOR_LINEAR_RANGE(1100000, 0x5a, 0x60, 0),
144 	REGULATOR_LINEAR_RANGE(1110000, 0x61, 0x69, 10000),
145 	REGULATOR_LINEAR_RANGE(1200000, 0x6a, 0x70, 0),
146 	REGULATOR_LINEAR_RANGE(1210000, 0x71, 0x79, 10000),
147 	REGULATOR_LINEAR_RANGE(1300000, 0x7a, 0x80, 0),
148 	REGULATOR_LINEAR_RANGE(1310000, 0x81, 0x89, 10000),
149 	REGULATOR_LINEAR_RANGE(1400000, 0x8a, 0x90, 0),
150 	REGULATOR_LINEAR_RANGE(1410000, 0x91, 0x99, 10000),
151 	REGULATOR_LINEAR_RANGE(1500000, 0x9a, 0xa0, 0),
152 	REGULATOR_LINEAR_RANGE(1510000, 0xa1, 0xa9, 10000),
153 	REGULATOR_LINEAR_RANGE(1600000, 0xaa, 0xb0, 0),
154 	REGULATOR_LINEAR_RANGE(1610000, 0xb1, 0xb9, 10000),
155 	REGULATOR_LINEAR_RANGE(1700000, 0xba, 0xc0, 0),
156 	REGULATOR_LINEAR_RANGE(1710000, 0xc1, 0xc9, 10000),
157 	REGULATOR_LINEAR_RANGE(1800000, 0xca, 0xd0, 0),
158 	REGULATOR_LINEAR_RANGE(1810000, 0xd1, 0xd9, 10000),
159 	REGULATOR_LINEAR_RANGE(1900000, 0xda, 0xe0, 0),
160 	REGULATOR_LINEAR_RANGE(1910000, 0xe1, 0xe9, 10000),
161 	REGULATOR_LINEAR_RANGE(2000000, 0xea, 0xf0, 0),
162 	REGULATOR_LINEAR_RANGE(2010000, 0xf1, 0xf9, 10000),
163 	REGULATOR_LINEAR_RANGE(2100000, 0xfa, 0xff, 0),
164 };
165 
166 static const struct linear_range ldo_vout_ranges2[] = {
167 	REGULATOR_LINEAR_RANGE(1200000, 0x00, 0x09, 10000),
168 	REGULATOR_LINEAR_RANGE(1300000, 0x0a, 0x10, 0),
169 	REGULATOR_LINEAR_RANGE(1310000, 0x11, 0x19, 10000),
170 	REGULATOR_LINEAR_RANGE(1400000, 0x1a, 0x1f, 0),
171 	REGULATOR_LINEAR_RANGE(1500000, 0x20, 0x29, 10000),
172 	REGULATOR_LINEAR_RANGE(1600000, 0x2a, 0x2f, 0),
173 	REGULATOR_LINEAR_RANGE(1700000, 0x30, 0x39, 10000),
174 	REGULATOR_LINEAR_RANGE(1800000, 0x3a, 0x40, 0),
175 	REGULATOR_LINEAR_RANGE(1810000, 0x41, 0x49, 10000),
176 	REGULATOR_LINEAR_RANGE(1900000, 0x4a, 0x4f, 0),
177 	REGULATOR_LINEAR_RANGE(2000000, 0x50, 0x59, 10000),
178 	REGULATOR_LINEAR_RANGE(2100000, 0x5a, 0x60, 0),
179 	REGULATOR_LINEAR_RANGE(2110000, 0x61, 0x69, 10000),
180 	REGULATOR_LINEAR_RANGE(2200000, 0x6a, 0x6f, 0),
181 	REGULATOR_LINEAR_RANGE(2500000, 0x70, 0x79, 10000),
182 	REGULATOR_LINEAR_RANGE(2600000, 0x7a, 0x7f, 0),
183 	REGULATOR_LINEAR_RANGE(2700000, 0x80, 0x89, 10000),
184 	REGULATOR_LINEAR_RANGE(2800000, 0x8a, 0x90, 0),
185 	REGULATOR_LINEAR_RANGE(2810000, 0x91, 0x99, 10000),
186 	REGULATOR_LINEAR_RANGE(2900000, 0x9a, 0xa0, 0),
187 	REGULATOR_LINEAR_RANGE(2910000, 0xa1, 0xa9, 10000),
188 	REGULATOR_LINEAR_RANGE(3000000, 0xaa, 0xb0, 0),
189 	REGULATOR_LINEAR_RANGE(3010000, 0xb1, 0xb9, 10000),
190 	REGULATOR_LINEAR_RANGE(3100000, 0xba, 0xc0, 0),
191 	REGULATOR_LINEAR_RANGE(3110000, 0xc1, 0xc9, 10000),
192 	REGULATOR_LINEAR_RANGE(3200000, 0xca, 0xcf, 0),
193 	REGULATOR_LINEAR_RANGE(3300000, 0xd0, 0xd9, 10000),
194 	REGULATOR_LINEAR_RANGE(3400000, 0xda, 0xe0, 0),
195 	REGULATOR_LINEAR_RANGE(3410000, 0xe1, 0xe9, 10000),
196 	REGULATOR_LINEAR_RANGE(3500000, 0xea, 0xf0, 0),
197 	REGULATOR_LINEAR_RANGE(3510000, 0xf1, 0xf9, 10000),
198 	REGULATOR_LINEAR_RANGE(3600000, 0xfa, 0xff, 0),
199 };
200 
201 static const struct linear_range ldo_vout_ranges3[] = {
202 	REGULATOR_LINEAR_RANGE(2700000, 0x00, 0x09, 10000),
203 	REGULATOR_LINEAR_RANGE(2800000, 0x0a, 0x10, 0),
204 	REGULATOR_LINEAR_RANGE(2810000, 0x11, 0x19, 10000),
205 	REGULATOR_LINEAR_RANGE(2900000, 0x1a, 0x20, 0),
206 	REGULATOR_LINEAR_RANGE(2910000, 0x21, 0x29, 10000),
207 	REGULATOR_LINEAR_RANGE(3000000, 0x2a, 0x30, 0),
208 	REGULATOR_LINEAR_RANGE(3010000, 0x31, 0x39, 10000),
209 	REGULATOR_LINEAR_RANGE(3100000, 0x3a, 0x40, 0),
210 	REGULATOR_LINEAR_RANGE(3110000, 0x41, 0x49, 10000),
211 	REGULATOR_LINEAR_RANGE(3200000, 0x4a, 0x4f, 0),
212 	REGULATOR_LINEAR_RANGE(3300000, 0x50, 0x59, 10000),
213 	REGULATOR_LINEAR_RANGE(3400000, 0x5a, 0x60, 0),
214 	REGULATOR_LINEAR_RANGE(3410000, 0x61, 0x69, 10000),
215 	REGULATOR_LINEAR_RANGE(3500000, 0x6a, 0x70, 0),
216 	REGULATOR_LINEAR_RANGE(3510000, 0x71, 0x79, 10000),
217 	REGULATOR_LINEAR_RANGE(3600000, 0x7a, 0x7f, 0),
218 };
219 
220 static int mt6360_regulator_set_mode(struct regulator_dev *rdev,
221 				     unsigned int mode)
222 {
223 	const struct mt6360_regulator_desc *rdesc = (struct mt6360_regulator_desc *)rdev->desc;
224 	struct regmap *regmap = rdev_get_regmap(rdev);
225 	int shift = ffs(rdesc->mode_mask) - 1;
226 	unsigned int val;
227 	int ret;
228 
229 	switch (mode) {
230 	case REGULATOR_MODE_NORMAL:
231 		val = MT6360_OPMODE_NORMAL;
232 		break;
233 	case REGULATOR_MODE_STANDBY:
234 		val = MT6360_OPMODE_ULP;
235 		break;
236 	case REGULATOR_MODE_IDLE:
237 		val = MT6360_OPMODE_LP;
238 		break;
239 	default:
240 		return -EINVAL;
241 	}
242 
243 	ret = regmap_update_bits(regmap, rdesc->mode_reg, rdesc->mode_mask, val << shift);
244 	if (ret) {
245 		dev_err(&rdev->dev, "%s: fail (%d)\n", __func__, ret);
246 		return ret;
247 	}
248 
249 	return 0;
250 }
251 
252 static unsigned int mt6360_regulator_get_mode(struct regulator_dev *rdev)
253 {
254 	const struct mt6360_regulator_desc *rdesc = (struct mt6360_regulator_desc *)rdev->desc;
255 	struct regmap *regmap = rdev_get_regmap(rdev);
256 	int shift = ffs(rdesc->mode_mask) - 1;
257 	unsigned int val;
258 	int ret;
259 
260 	ret = regmap_read(regmap, rdesc->mode_reg, &val);
261 	if (ret)
262 		return ret;
263 
264 	val &= rdesc->mode_mask;
265 	val >>= shift;
266 
267 	switch (val) {
268 	case MT6360_OPMODE_LP:
269 		return REGULATOR_MODE_IDLE;
270 	case MT6360_OPMODE_ULP:
271 		return REGULATOR_MODE_STANDBY;
272 	case MT6360_OPMODE_NORMAL:
273 		return REGULATOR_MODE_NORMAL;
274 	default:
275 		return -EINVAL;
276 	}
277 }
278 
279 static int mt6360_regulator_get_status(struct regulator_dev *rdev)
280 {
281 	const struct mt6360_regulator_desc *rdesc = (struct mt6360_regulator_desc *)rdev->desc;
282 	struct regmap *regmap = rdev_get_regmap(rdev);
283 	unsigned int val;
284 	int ret;
285 
286 	ret = regmap_read(regmap, rdesc->state_reg, &val);
287 	if (ret)
288 		return ret;
289 
290 	if (val & rdesc->state_mask)
291 		return REGULATOR_STATUS_ON;
292 
293 	return REGULATOR_STATUS_OFF;
294 }
295 
296 static const struct regulator_ops mt6360_regulator_ops = {
297 	.list_voltage = regulator_list_voltage_linear_range,
298 	.enable = regulator_enable_regmap,
299 	.disable = regulator_disable_regmap,
300 	.is_enabled = regulator_is_enabled_regmap,
301 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
302 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
303 	.set_mode = mt6360_regulator_set_mode,
304 	.get_mode = mt6360_regulator_get_mode,
305 	.get_status = mt6360_regulator_get_status,
306 };
307 
308 static unsigned int mt6360_regulator_of_map_mode(unsigned int hw_mode)
309 {
310 	switch (hw_mode) {
311 	case MT6360_OPMODE_NORMAL:
312 		return REGULATOR_MODE_NORMAL;
313 	case MT6360_OPMODE_LP:
314 		return REGULATOR_MODE_IDLE;
315 	case MT6360_OPMODE_ULP:
316 		return REGULATOR_MODE_STANDBY;
317 	default:
318 		return REGULATOR_MODE_INVALID;
319 	}
320 }
321 
322 #define MT6360_REGULATOR_DESC(_name, _sname, ereg, emask, vreg,	vmask,	\
323 			      mreg, mmask, streg, stmask, vranges,	\
324 			      vcnts, offon_delay, irq_tbls)		\
325 {									\
326 	.desc = {							\
327 		.name = #_name,						\
328 		.supply_name = #_sname,					\
329 		.id =  MT6360_REGULATOR_##_name,			\
330 		.of_match = of_match_ptr(#_name),			\
331 		.regulators_node = of_match_ptr("regulator"),		\
332 		.of_map_mode = mt6360_regulator_of_map_mode,		\
333 		.owner = THIS_MODULE,					\
334 		.ops = &mt6360_regulator_ops,				\
335 		.type = REGULATOR_VOLTAGE,				\
336 		.vsel_reg = vreg,					\
337 		.vsel_mask = vmask,					\
338 		.enable_reg = ereg,					\
339 		.enable_mask = emask,					\
340 		.linear_ranges = vranges,				\
341 		.n_linear_ranges = ARRAY_SIZE(vranges),			\
342 		.n_voltages = vcnts,					\
343 		.off_on_delay = offon_delay,				\
344 	},								\
345 	.mode_reg = mreg,						\
346 	.mode_mask = mmask,						\
347 	.state_reg = streg,						\
348 	.state_mask = stmask,						\
349 	.irq_tables = irq_tbls,						\
350 	.irq_table_size = ARRAY_SIZE(irq_tbls),				\
351 }
352 
353 static const struct mt6360_regulator_desc mt6360_regulator_descs[] =  {
354 	MT6360_REGULATOR_DESC(BUCK1, BUCK1_VIN, 0x117, 0x40, 0x110, 0xff, 0x117, 0x30, 0x117, 0x04,
355 			      buck_vout_ranges, 256, 0, buck1_irq_tbls),
356 	MT6360_REGULATOR_DESC(BUCK2, BUCK2_VIN, 0x127, 0x40, 0x120, 0xff, 0x127, 0x30, 0x127, 0x04,
357 			      buck_vout_ranges, 256, 0, buck2_irq_tbls),
358 	MT6360_REGULATOR_DESC(LDO6, LDO_VIN3, 0x137, 0x40, 0x13B, 0xff, 0x137, 0x30, 0x137, 0x04,
359 			      ldo_vout_ranges1, 256, 0, ldo6_irq_tbls),
360 	MT6360_REGULATOR_DESC(LDO7, LDO_VIN3, 0x131, 0x40, 0x135, 0xff, 0x131, 0x30, 0x131, 0x04,
361 			      ldo_vout_ranges1, 256, 0, ldo7_irq_tbls),
362 	MT6360_REGULATOR_DESC(LDO1, LDO_VIN1, 0x217, 0x40, 0x21B, 0xff, 0x217, 0x30, 0x217, 0x04,
363 			      ldo_vout_ranges2, 256, 0, ldo1_irq_tbls),
364 	MT6360_REGULATOR_DESC(LDO2, LDO_VIN1, 0x211, 0x40, 0x215, 0xff, 0x211, 0x30, 0x211, 0x04,
365 			      ldo_vout_ranges2, 256, 0, ldo2_irq_tbls),
366 	MT6360_REGULATOR_DESC(LDO3, LDO_VIN1, 0x205, 0x40, 0x209, 0xff, 0x205, 0x30, 0x205, 0x04,
367 			      ldo_vout_ranges2, 256, 100, ldo3_irq_tbls),
368 	MT6360_REGULATOR_DESC(LDO5, LDO_VIN2, 0x20B, 0x40, 0x20F, 0x7f, 0x20B, 0x30, 0x20B, 0x04,
369 			      ldo_vout_ranges3, 128, 100, ldo5_irq_tbls),
370 };
371 
372 static int mt6360_regulator_irq_register(struct platform_device *pdev,
373 					 struct regulator_dev *rdev,
374 					 const struct mt6360_irq_mapping *tbls,
375 					 int tbl_size)
376 {
377 	int i, irq, ret;
378 
379 	for (i = 0; i < tbl_size; i++) {
380 		const struct mt6360_irq_mapping *irq_desc = tbls + i;
381 
382 		irq = platform_get_irq_byname(pdev, irq_desc->name);
383 		if (irq < 0)
384 			return irq;
385 
386 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, irq_desc->handler, 0,
387 						irq_desc->name, rdev);
388 		if (ret) {
389 			dev_err(&pdev->dev, "Fail to request %s irq\n", irq_desc->name);
390 			return ret;
391 		}
392 	}
393 
394 	return 0;
395 }
396 
397 static int mt6360_regulator_probe(struct platform_device *pdev)
398 {
399 	struct mt6360_regulator_data *mrd;
400 	struct regulator_config config = {};
401 	int i, ret;
402 
403 	mrd = devm_kzalloc(&pdev->dev, sizeof(*mrd), GFP_KERNEL);
404 	if (!mrd)
405 		return -ENOMEM;
406 
407 	mrd->dev = &pdev->dev;
408 
409 	mrd->regmap = dev_get_regmap(pdev->dev.parent, NULL);
410 	if (!mrd->regmap) {
411 		dev_err(&pdev->dev, "Failed to get parent regmap\n");
412 		return -ENODEV;
413 	}
414 
415 	config.dev = pdev->dev.parent;
416 	config.driver_data = mrd;
417 	config.regmap = mrd->regmap;
418 
419 	for (i = 0; i < ARRAY_SIZE(mt6360_regulator_descs); i++) {
420 		const struct mt6360_regulator_desc *rdesc = mt6360_regulator_descs + i;
421 		struct regulator_dev *rdev;
422 
423 		rdev = devm_regulator_register(&pdev->dev, &rdesc->desc, &config);
424 		if (IS_ERR(rdev)) {
425 			dev_err(&pdev->dev, "Failed to register  %d regulator\n", i);
426 			return PTR_ERR(rdev);
427 		}
428 
429 		ret = mt6360_regulator_irq_register(pdev, rdev, rdesc->irq_tables,
430 						    rdesc->irq_table_size);
431 		if (ret) {
432 			dev_err(&pdev->dev, "Failed to register  %d regulator irqs\n", i);
433 			return ret;
434 		}
435 	}
436 
437 	return 0;
438 }
439 
440 static const struct platform_device_id mt6360_regulator_id_table[] = {
441 	{ "mt6360-regulator", 0 },
442 	{},
443 };
444 MODULE_DEVICE_TABLE(platform, mt6360_regulator_id_table);
445 
446 static struct platform_driver mt6360_regulator_driver = {
447 	.driver = {
448 		.name = "mt6360-regulator",
449 	},
450 	.probe = mt6360_regulator_probe,
451 	.id_table = mt6360_regulator_id_table,
452 };
453 module_platform_driver(mt6360_regulator_driver);
454 
455 MODULE_AUTHOR("Gene Chen <gene_chen@richtek.com>");
456 MODULE_DESCRIPTION("MT6360 Regulator Driver");
457 MODULE_LICENSE("GPL v2");
458