1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // tps65219-regulator.c
4 //
5 // Regulator driver for TPS65219 PMIC
6 //
7 // Copyright (C) 2022 BayLibre Incorporated - https://www.baylibre.com/
8 //
9 // This implementation derived from tps65218 authored by
10 // "J Keerthy <j-keerthy@ti.com>"
11 //
12 
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/init.h>
17 #include <linux/err.h>
18 #include <linux/platform_device.h>
19 #include <linux/of_device.h>
20 #include <linux/regmap.h>
21 #include <linux/regulator/of_regulator.h>
22 #include <linux/regulator/driver.h>
23 #include <linux/regulator/machine.h>
24 #include <linux/mfd/tps65219.h>
25 
26 struct tps65219_regulator_irq_type {
27 	const char *irq_name;
28 	const char *regulator_name;
29 	const char *event_name;
30 	unsigned long event;
31 };
32 
33 static struct tps65219_regulator_irq_type tps65219_regulator_irq_types[] = {
34 	{ "LDO3_SCG", "LDO3", "short circuit to ground", REGULATOR_EVENT_REGULATION_OUT },
35 	{ "LDO3_OC", "LDO3", "overcurrent", REGULATOR_EVENT_OVER_CURRENT },
36 	{ "LDO3_UV", "LDO3", "undervoltage", REGULATOR_EVENT_UNDER_VOLTAGE },
37 	{ "LDO4_SCG", "LDO4", "short circuit to ground", REGULATOR_EVENT_REGULATION_OUT },
38 	{ "LDO4_OC", "LDO4", "overcurrent", REGULATOR_EVENT_OVER_CURRENT },
39 	{ "LDO4_UV", "LDO4", "undervoltage", REGULATOR_EVENT_UNDER_VOLTAGE },
40 	{ "LDO1_SCG", "LDO1", "short circuit to ground", REGULATOR_EVENT_REGULATION_OUT },
41 	{ "LDO1_OC", "LDO1", "overcurrent", REGULATOR_EVENT_OVER_CURRENT },
42 	{ "LDO1_UV", "LDO1", "undervoltage", REGULATOR_EVENT_UNDER_VOLTAGE },
43 	{ "LDO2_SCG", "LDO2", "short circuit to ground", REGULATOR_EVENT_REGULATION_OUT },
44 	{ "LDO2_OC", "LDO2", "overcurrent", REGULATOR_EVENT_OVER_CURRENT },
45 	{ "LDO2_UV", "LDO2", "undervoltage", REGULATOR_EVENT_UNDER_VOLTAGE },
46 	{ "BUCK3_SCG", "BUCK3", "short circuit to ground", REGULATOR_EVENT_REGULATION_OUT },
47 	{ "BUCK3_OC", "BUCK3", "overcurrent", REGULATOR_EVENT_OVER_CURRENT },
48 	{ "BUCK3_NEG_OC", "BUCK3", "negative overcurrent", REGULATOR_EVENT_OVER_CURRENT },
49 	{ "BUCK3_UV", "BUCK3", "undervoltage", REGULATOR_EVENT_UNDER_VOLTAGE },
50 	{ "BUCK1_SCG", "BUCK1", "short circuit to ground", REGULATOR_EVENT_REGULATION_OUT },
51 	{ "BUCK1_OC", "BUCK1", "overcurrent", REGULATOR_EVENT_OVER_CURRENT },
52 	{ "BUCK1_NEG_OC", "BUCK1", "negative overcurrent", REGULATOR_EVENT_OVER_CURRENT },
53 	{ "BUCK1_UV", "BUCK1", "undervoltage", REGULATOR_EVENT_UNDER_VOLTAGE },
54 	{ "BUCK2_SCG", "BUCK2", "short circuit to ground", REGULATOR_EVENT_REGULATION_OUT },
55 	{ "BUCK2_OC", "BUCK2", "overcurrent", REGULATOR_EVENT_OVER_CURRENT },
56 	{ "BUCK2_NEG_OC", "BUCK2", "negative overcurrent", REGULATOR_EVENT_OVER_CURRENT },
57 	{ "BUCK2_UV", "BUCK2", "undervoltage", REGULATOR_EVENT_UNDER_VOLTAGE },
58 	{ "BUCK1_RV", "BUCK1", "residual voltage", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
59 	{ "BUCK2_RV", "BUCK2", "residual voltage", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
60 	{ "BUCK3_RV", "BUCK3", "residual voltage", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
61 	{ "LDO1_RV", "LDO1", "residual voltage", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
62 	{ "LDO2_RV", "LDO2", "residual voltage", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
63 	{ "LDO3_RV", "LDO3", "residual voltage", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
64 	{ "LDO4_RV", "LDO4", "residual voltage", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
65 	{ "BUCK1_RV_SD", "BUCK1", "residual voltage on shutdown",
66 	 REGULATOR_EVENT_OVER_VOLTAGE_WARN },
67 	{ "BUCK2_RV_SD", "BUCK2", "residual voltage on shutdown",
68 	 REGULATOR_EVENT_OVER_VOLTAGE_WARN },
69 	{ "BUCK3_RV_SD", "BUCK3", "residual voltage on shutdown",
70 	 REGULATOR_EVENT_OVER_VOLTAGE_WARN },
71 	{ "LDO1_RV_SD", "LDO1", "residual voltage on shutdown", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
72 	{ "LDO2_RV_SD", "LDO2", "residual voltage on shutdown", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
73 	{ "LDO3_RV_SD", "LDO3", "residual voltage on shutdown", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
74 	{ "LDO4_RV_SD", "LDO4", "residual voltage on shutdown", REGULATOR_EVENT_OVER_VOLTAGE_WARN },
75 	{ "SENSOR_3_WARM", "SENSOR3", "warm temperature", REGULATOR_EVENT_OVER_TEMP_WARN},
76 	{ "SENSOR_2_WARM", "SENSOR2", "warm temperature", REGULATOR_EVENT_OVER_TEMP_WARN },
77 	{ "SENSOR_1_WARM", "SENSOR1", "warm temperature", REGULATOR_EVENT_OVER_TEMP_WARN },
78 	{ "SENSOR_0_WARM", "SENSOR0", "warm temperature", REGULATOR_EVENT_OVER_TEMP_WARN },
79 	{ "SENSOR_3_HOT", "SENSOR3", "hot temperature", REGULATOR_EVENT_OVER_TEMP},
80 	{ "SENSOR_2_HOT", "SENSOR2", "hot temperature", REGULATOR_EVENT_OVER_TEMP },
81 	{ "SENSOR_1_HOT", "SENSOR1", "hot temperature", REGULATOR_EVENT_OVER_TEMP },
82 	{ "SENSOR_0_HOT", "SENSOR0", "hot temperature", REGULATOR_EVENT_OVER_TEMP },
83 	{ "TIMEOUT", "", "", REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE },
84 };
85 
86 struct tps65219_regulator_irq_data {
87 	struct device *dev;
88 	struct tps65219_regulator_irq_type *type;
89 	struct regulator_dev *rdev;
90 };
91 
92 #define TPS65219_REGULATOR(_name, _of, _id, _type, _ops, _n, _vr, _vm, _er, \
93 			   _em, _cr, _cm, _lr, _nlr, _delay, _fuv, \
94 			   _ct, _ncl, _bpm) \
95 	{								\
96 		.name			= _name,			\
97 		.of_match		= _of,				\
98 		.regulators_node	= of_match_ptr("regulators"),	\
99 		.supply_name		= _of,				\
100 		.id			= _id,				\
101 		.ops			= &(_ops),			\
102 		.n_voltages		= _n,				\
103 		.type			= _type,			\
104 		.owner			= THIS_MODULE,			\
105 		.vsel_reg		= _vr,				\
106 		.vsel_mask		= _vm,				\
107 		.csel_reg		= _cr,				\
108 		.csel_mask		= _cm,				\
109 		.curr_table		= _ct,				\
110 		.n_current_limits	= _ncl,				\
111 		.enable_reg		= _er,				\
112 		.enable_mask		= _em,				\
113 		.volt_table		= NULL,				\
114 		.linear_ranges		= _lr,				\
115 		.n_linear_ranges	= _nlr,				\
116 		.ramp_delay		= _delay,			\
117 		.fixed_uV		= _fuv,				\
118 		.bypass_reg		= _vr,				\
119 		.bypass_mask		= _bpm,				\
120 	}								\
121 
122 static const struct linear_range bucks_ranges[] = {
123 	REGULATOR_LINEAR_RANGE(600000, 0x0, 0x1f, 25000),
124 	REGULATOR_LINEAR_RANGE(1400000, 0x20, 0x33, 100000),
125 	REGULATOR_LINEAR_RANGE(3400000, 0x34, 0x3f, 0),
126 };
127 
128 static const struct linear_range ldos_1_2_ranges[] = {
129 	REGULATOR_LINEAR_RANGE(600000, 0x0, 0x37, 50000),
130 	REGULATOR_LINEAR_RANGE(3400000, 0x38, 0x3f, 0),
131 };
132 
133 static const struct linear_range ldos_3_4_ranges[] = {
134 	REGULATOR_LINEAR_RANGE(1200000, 0x0, 0xC, 0),
135 	REGULATOR_LINEAR_RANGE(1250000, 0xD, 0x35, 50000),
136 	REGULATOR_LINEAR_RANGE(3300000, 0x36, 0x3F, 0),
137 };
138 
139 static int tps65219_set_mode(struct regulator_dev *dev, unsigned int mode)
140 {
141 	struct tps65219 *tps = rdev_get_drvdata(dev);
142 
143 	switch (mode) {
144 	case REGULATOR_MODE_NORMAL:
145 		return regmap_set_bits(tps->regmap, TPS65219_REG_STBY_1_CONFIG,
146 				       dev->desc->enable_mask);
147 
148 	case REGULATOR_MODE_STANDBY:
149 		return regmap_clear_bits(tps->regmap,
150 					 TPS65219_REG_STBY_1_CONFIG,
151 					 dev->desc->enable_mask);
152 	default:
153 		return -EINVAL;
154 	}
155 }
156 
157 static unsigned int tps65219_get_mode(struct regulator_dev *dev)
158 {
159 	struct tps65219 *tps = rdev_get_drvdata(dev);
160 	unsigned int rid = rdev_get_id(dev);
161 	int ret, value = 0;
162 
163 	ret = regmap_read(tps->regmap, TPS65219_REG_STBY_1_CONFIG, &value);
164 	if (ret) {
165 		dev_dbg(tps->dev, "%s failed for regulator %s: %d ",
166 			__func__, dev->desc->name, ret);
167 		return ret;
168 	}
169 	value = (value & BIT(rid)) >> rid;
170 	if (value)
171 		return REGULATOR_MODE_STANDBY;
172 	else
173 		return REGULATOR_MODE_NORMAL;
174 }
175 
176 /* Operations permitted on BUCK1/2/3 */
177 static const struct regulator_ops tps65219_bucks_ops = {
178 	.is_enabled		= regulator_is_enabled_regmap,
179 	.enable			= regulator_enable_regmap,
180 	.disable		= regulator_disable_regmap,
181 	.set_mode		= tps65219_set_mode,
182 	.get_mode		= tps65219_get_mode,
183 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
184 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
185 	.list_voltage		= regulator_list_voltage_linear_range,
186 	.map_voltage		= regulator_map_voltage_linear_range,
187 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
188 
189 };
190 
191 /* Operations permitted on LDO1/2 */
192 static const struct regulator_ops tps65219_ldos_1_2_ops = {
193 	.is_enabled		= regulator_is_enabled_regmap,
194 	.enable			= regulator_enable_regmap,
195 	.disable		= regulator_disable_regmap,
196 	.set_mode		= tps65219_set_mode,
197 	.get_mode		= tps65219_get_mode,
198 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
199 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
200 	.list_voltage		= regulator_list_voltage_linear_range,
201 	.map_voltage		= regulator_map_voltage_linear_range,
202 	.set_bypass		= regulator_set_bypass_regmap,
203 	.get_bypass		= regulator_get_bypass_regmap,
204 };
205 
206 /* Operations permitted on LDO3/4 */
207 static const struct regulator_ops tps65219_ldos_3_4_ops = {
208 	.is_enabled		= regulator_is_enabled_regmap,
209 	.enable			= regulator_enable_regmap,
210 	.disable		= regulator_disable_regmap,
211 	.set_mode		= tps65219_set_mode,
212 	.get_mode		= tps65219_get_mode,
213 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
214 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
215 	.list_voltage		= regulator_list_voltage_linear_range,
216 	.map_voltage		= regulator_map_voltage_linear_range,
217 };
218 
219 static const struct regulator_desc regulators[] = {
220 	TPS65219_REGULATOR("BUCK1", "buck1", TPS65219_BUCK_1,
221 			   REGULATOR_VOLTAGE, tps65219_bucks_ops, 64,
222 			   TPS65219_REG_BUCK1_VOUT,
223 			   TPS65219_BUCKS_LDOS_VOUT_VSET_MASK,
224 			   TPS65219_REG_ENABLE_CTRL,
225 			   TPS65219_ENABLE_BUCK1_EN_MASK, 0, 0, bucks_ranges,
226 			   3, 4000, 0, NULL, 0, 0),
227 	TPS65219_REGULATOR("BUCK2", "buck2", TPS65219_BUCK_2,
228 			   REGULATOR_VOLTAGE, tps65219_bucks_ops, 64,
229 			   TPS65219_REG_BUCK2_VOUT,
230 			   TPS65219_BUCKS_LDOS_VOUT_VSET_MASK,
231 			   TPS65219_REG_ENABLE_CTRL,
232 			   TPS65219_ENABLE_BUCK2_EN_MASK, 0, 0, bucks_ranges,
233 			   3, 4000, 0, NULL, 0, 0),
234 	TPS65219_REGULATOR("BUCK3", "buck3", TPS65219_BUCK_3,
235 			   REGULATOR_VOLTAGE, tps65219_bucks_ops, 64,
236 			   TPS65219_REG_BUCK3_VOUT,
237 			   TPS65219_BUCKS_LDOS_VOUT_VSET_MASK,
238 			   TPS65219_REG_ENABLE_CTRL,
239 			   TPS65219_ENABLE_BUCK3_EN_MASK, 0, 0, bucks_ranges,
240 			   3, 0, 0, NULL, 0, 0),
241 	TPS65219_REGULATOR("LDO1", "ldo1", TPS65219_LDO_1,
242 			   REGULATOR_VOLTAGE, tps65219_ldos_1_2_ops, 64,
243 			   TPS65219_REG_LDO1_VOUT,
244 			   TPS65219_BUCKS_LDOS_VOUT_VSET_MASK,
245 			   TPS65219_REG_ENABLE_CTRL,
246 			   TPS65219_ENABLE_LDO1_EN_MASK, 0, 0, ldos_1_2_ranges,
247 			   2, 0, 0, NULL, 0, TPS65219_LDOS_BYP_CONFIG_MASK),
248 	TPS65219_REGULATOR("LDO2", "ldo2", TPS65219_LDO_2,
249 			   REGULATOR_VOLTAGE, tps65219_ldos_1_2_ops, 64,
250 			   TPS65219_REG_LDO2_VOUT,
251 			   TPS65219_BUCKS_LDOS_VOUT_VSET_MASK,
252 			   TPS65219_REG_ENABLE_CTRL,
253 			   TPS65219_ENABLE_LDO2_EN_MASK, 0, 0, ldos_1_2_ranges,
254 			   2, 0, 0, NULL, 0, TPS65219_LDOS_BYP_CONFIG_MASK),
255 	TPS65219_REGULATOR("LDO3", "ldo3", TPS65219_LDO_3,
256 			   REGULATOR_VOLTAGE, tps65219_ldos_3_4_ops, 64,
257 			   TPS65219_REG_LDO3_VOUT,
258 			   TPS65219_BUCKS_LDOS_VOUT_VSET_MASK,
259 			   TPS65219_REG_ENABLE_CTRL,
260 			   TPS65219_ENABLE_LDO3_EN_MASK, 0, 0, ldos_3_4_ranges,
261 			   3, 0, 0, NULL, 0, 0),
262 	TPS65219_REGULATOR("LDO4", "ldo4", TPS65219_LDO_4,
263 			   REGULATOR_VOLTAGE, tps65219_ldos_3_4_ops, 64,
264 			   TPS65219_REG_LDO4_VOUT,
265 			   TPS65219_BUCKS_LDOS_VOUT_VSET_MASK,
266 			   TPS65219_REG_ENABLE_CTRL,
267 			   TPS65219_ENABLE_LDO4_EN_MASK, 0, 0, ldos_3_4_ranges,
268 			   3, 0, 0, NULL, 0, 0),
269 };
270 
271 static irqreturn_t tps65219_regulator_irq_handler(int irq, void *data)
272 {
273 	struct tps65219_regulator_irq_data *irq_data = data;
274 
275 	if (irq_data->type->event_name[0] == '\0') {
276 		/* This is the timeout interrupt no specific regulator */
277 		dev_err(irq_data->dev,
278 			"System was put in shutdown due to timeout during an active or standby transition.\n");
279 		return IRQ_HANDLED;
280 	}
281 
282 	regulator_notifier_call_chain(irq_data->rdev,
283 				      irq_data->type->event, NULL);
284 
285 	dev_err(irq_data->dev, "Error IRQ trap %s for %s\n",
286 		irq_data->type->event_name, irq_data->type->regulator_name);
287 	return IRQ_HANDLED;
288 }
289 
290 static int tps65219_get_rdev_by_name(const char *regulator_name,
291 				     struct regulator_dev *rdevtbl[7],
292 				     struct regulator_dev *dev)
293 {
294 	int i;
295 
296 	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
297 		if (strcmp(regulator_name, regulators[i].name) == 0) {
298 			dev = rdevtbl[i];
299 			return 0;
300 		}
301 	}
302 	return -EINVAL;
303 }
304 
305 static int tps65219_regulator_probe(struct platform_device *pdev)
306 {
307 	struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
308 	struct regulator_dev *rdev;
309 	struct regulator_config config = { };
310 	int i;
311 	int error;
312 	int irq;
313 	struct tps65219_regulator_irq_data *irq_data;
314 	struct tps65219_regulator_irq_type *irq_type;
315 	struct regulator_dev *rdevtbl[7];
316 
317 	config.dev = tps->dev;
318 	config.driver_data = tps;
319 	config.regmap = tps->regmap;
320 
321 	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
322 		dev_dbg(tps->dev, "%s regul i= %d START", __func__, i);
323 		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
324 					       &config);
325 		if (IS_ERR(rdev)) {
326 			dev_err(tps->dev, "failed to register %s regulator\n",
327 				regulators[i].name);
328 			return PTR_ERR(rdev);
329 		}
330 		rdevtbl[i] = rdev;
331 		dev_dbg(tps->dev, "%s regul i= %d COMPLETED", __func__, i);
332 	}
333 
334 	irq_data = devm_kmalloc(tps->dev,
335 				ARRAY_SIZE(tps65219_regulator_irq_types) *
336 				sizeof(struct tps65219_regulator_irq_data),
337 				GFP_KERNEL);
338 	if (!irq_data)
339 		return -ENOMEM;
340 
341 	for (i = 0; i < ARRAY_SIZE(tps65219_regulator_irq_types); ++i) {
342 		irq_type = &tps65219_regulator_irq_types[i];
343 
344 		irq = platform_get_irq_byname(pdev, irq_type->irq_name);
345 		if (irq < 0)
346 			return -EINVAL;
347 
348 		irq_data[i].dev = tps->dev;
349 		irq_data[i].type = irq_type;
350 
351 		tps65219_get_rdev_by_name(irq_type->regulator_name, rdevtbl, rdev);
352 		if (IS_ERR(rdev)) {
353 			dev_err(tps->dev, "Failed to get rdev for %s\n",
354 				irq_type->regulator_name);
355 			return -EINVAL;
356 		}
357 		irq_data[i].rdev = rdev;
358 
359 		error = devm_request_threaded_irq(tps->dev, irq, NULL,
360 						  tps65219_regulator_irq_handler,
361 						  IRQF_ONESHOT,
362 						  irq_type->irq_name,
363 						  &irq_data[i]);
364 		if (error) {
365 			dev_err(tps->dev, "failed to request %s IRQ %d: %d\n",
366 				irq_type->irq_name, irq, error);
367 			return error;
368 		}
369 	}
370 
371 	return 0;
372 }
373 
374 static const struct platform_device_id tps65219_regulator_id_table[] = {
375 	{ "tps65219-regulator", },
376 	{ /* sentinel */ }
377 };
378 MODULE_DEVICE_TABLE(platform, tps65219_regulator_id_table);
379 
380 static struct platform_driver tps65219_regulator_driver = {
381 	.driver = {
382 		.name = "tps65219-pmic",
383 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
384 	},
385 	.probe = tps65219_regulator_probe,
386 	.id_table = tps65219_regulator_id_table,
387 };
388 
389 module_platform_driver(tps65219_regulator_driver);
390 
391 MODULE_AUTHOR("Jerome Neanne <j-neanne@baylibre.com>");
392 MODULE_DESCRIPTION("TPS65219 voltage regulator driver");
393 MODULE_ALIAS("platform:tps65219-pmic");
394 MODULE_LICENSE("GPL");
395