xref: /openbmc/linux/drivers/regulator/lp8755.c (revision 3a35093a)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * LP8755 High Performance Power Management Unit : System Interface Driver
4  * (based on rev. 0.26)
5  * Copyright 2012 Texas Instruments
6  *
7  * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
8  */
9 
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/i2c.h>
13 #include <linux/err.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16 #include <linux/gpio.h>
17 #include <linux/regmap.h>
18 #include <linux/uaccess.h>
19 #include <linux/regulator/driver.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/platform_data/lp8755.h>
22 
23 #define LP8755_REG_BUCK0	0x00
24 #define LP8755_REG_BUCK1	0x03
25 #define LP8755_REG_BUCK2	0x04
26 #define LP8755_REG_BUCK3	0x01
27 #define LP8755_REG_BUCK4	0x05
28 #define LP8755_REG_BUCK5	0x02
29 #define LP8755_REG_MAX		0xFF
30 
31 #define LP8755_BUCK_EN_M	BIT(7)
32 #define LP8755_BUCK_LINEAR_OUT_MAX	0x76
33 #define LP8755_BUCK_VOUT_M	0x7F
34 
35 struct lp8755_mphase {
36 	int nreg;
37 	int buck_num[LP8755_BUCK_MAX];
38 };
39 
40 struct lp8755_chip {
41 	struct device *dev;
42 	struct regmap *regmap;
43 	struct lp8755_platform_data *pdata;
44 
45 	int irq;
46 	unsigned int irqmask;
47 
48 	int mphase;
49 	struct regulator_dev *rdev[LP8755_BUCK_MAX];
50 };
51 
52 static int lp8755_buck_enable_time(struct regulator_dev *rdev)
53 {
54 	int ret;
55 	unsigned int regval;
56 	enum lp8755_bucks id = rdev_get_id(rdev);
57 
58 	ret = regmap_read(rdev->regmap, 0x12 + id, &regval);
59 	if (ret < 0) {
60 		dev_err(&rdev->dev, "i2c access error %s\n", __func__);
61 		return ret;
62 	}
63 	return (regval & 0xff) * 100;
64 }
65 
66 static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
67 {
68 	int ret;
69 	unsigned int regbval = 0x0;
70 	enum lp8755_bucks id = rdev_get_id(rdev);
71 	struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
72 
73 	switch (mode) {
74 	case REGULATOR_MODE_FAST:
75 		/* forced pwm mode */
76 		regbval = (0x01 << id);
77 		break;
78 	case REGULATOR_MODE_NORMAL:
79 		/* enable automatic pwm/pfm mode */
80 		ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00);
81 		if (ret < 0)
82 			goto err_i2c;
83 		break;
84 	case REGULATOR_MODE_IDLE:
85 		/* enable automatic pwm/pfm/lppfm mode */
86 		ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20);
87 		if (ret < 0)
88 			goto err_i2c;
89 
90 		ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01);
91 		if (ret < 0)
92 			goto err_i2c;
93 		break;
94 	default:
95 		dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
96 		/* forced pwm mode */
97 		regbval = (0x01 << id);
98 	}
99 
100 	ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval);
101 	if (ret < 0)
102 		goto err_i2c;
103 	return ret;
104 err_i2c:
105 	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
106 	return ret;
107 }
108 
109 static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
110 {
111 	int ret;
112 	unsigned int regval;
113 	enum lp8755_bucks id = rdev_get_id(rdev);
114 
115 	ret = regmap_read(rdev->regmap, 0x06, &regval);
116 	if (ret < 0)
117 		goto err_i2c;
118 
119 	/* mode fast means forced pwm mode */
120 	if (regval & (0x01 << id))
121 		return REGULATOR_MODE_FAST;
122 
123 	ret = regmap_read(rdev->regmap, 0x08 + id, &regval);
124 	if (ret < 0)
125 		goto err_i2c;
126 
127 	/* mode idle means automatic pwm/pfm/lppfm mode */
128 	if (regval & 0x20)
129 		return REGULATOR_MODE_IDLE;
130 
131 	/* mode normal means automatic pwm/pfm mode */
132 	return REGULATOR_MODE_NORMAL;
133 
134 err_i2c:
135 	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
136 	return 0;
137 }
138 
139 static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
140 {
141 	int ret;
142 	unsigned int regval = 0x00;
143 	enum lp8755_bucks id = rdev_get_id(rdev);
144 
145 	/* uV/us */
146 	switch (ramp) {
147 	case 0 ... 230:
148 		regval = 0x07;
149 		break;
150 	case 231 ... 470:
151 		regval = 0x06;
152 		break;
153 	case 471 ... 940:
154 		regval = 0x05;
155 		break;
156 	case 941 ... 1900:
157 		regval = 0x04;
158 		break;
159 	case 1901 ... 3800:
160 		regval = 0x03;
161 		break;
162 	case 3801 ... 7500:
163 		regval = 0x02;
164 		break;
165 	case 7501 ... 15000:
166 		regval = 0x01;
167 		break;
168 	case 15001 ... 30000:
169 		regval = 0x00;
170 		break;
171 	default:
172 		dev_err(&rdev->dev,
173 			"Not supported ramp value %d %s\n", ramp, __func__);
174 		return -EINVAL;
175 	}
176 
177 	ret = regmap_update_bits(rdev->regmap, 0x07 + id, 0x07, regval);
178 	if (ret < 0)
179 		goto err_i2c;
180 	return ret;
181 err_i2c:
182 	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
183 	return ret;
184 }
185 
186 static const struct regulator_ops lp8755_buck_ops = {
187 	.map_voltage = regulator_map_voltage_linear,
188 	.list_voltage = regulator_list_voltage_linear,
189 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
190 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
191 	.enable = regulator_enable_regmap,
192 	.disable = regulator_disable_regmap,
193 	.is_enabled = regulator_is_enabled_regmap,
194 	.enable_time = lp8755_buck_enable_time,
195 	.set_mode = lp8755_buck_set_mode,
196 	.get_mode = lp8755_buck_get_mode,
197 	.set_ramp_delay = lp8755_buck_set_ramp,
198 };
199 
200 #define lp8755_rail(_id) "lp8755_buck"#_id
201 #define lp8755_buck_init(_id)\
202 {\
203 	.constraints = {\
204 		.name = lp8755_rail(_id),\
205 		.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
206 		.min_uV = 500000,\
207 		.max_uV = 1675000,\
208 	},\
209 }
210 
211 static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
212 	[LP8755_BUCK0] = lp8755_buck_init(0),
213 	[LP8755_BUCK1] = lp8755_buck_init(1),
214 	[LP8755_BUCK2] = lp8755_buck_init(2),
215 	[LP8755_BUCK3] = lp8755_buck_init(3),
216 	[LP8755_BUCK4] = lp8755_buck_init(4),
217 	[LP8755_BUCK5] = lp8755_buck_init(5),
218 };
219 
220 static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
221 	{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
222 	{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
223 	       LP8755_BUCK4, LP8755_BUCK5 } },
224 	{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
225 	       LP8755_BUCK5} },
226 	{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
227 	{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
228 	{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
229 	{ 1, { LP8755_BUCK0} },
230 	{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
231 	{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
232 };
233 
234 static int lp8755_init_data(struct lp8755_chip *pchip)
235 {
236 	unsigned int regval;
237 	int ret, icnt, buck_num;
238 	struct lp8755_platform_data *pdata = pchip->pdata;
239 
240 	/* read back  muti-phase configuration */
241 	ret = regmap_read(pchip->regmap, 0x3D, &regval);
242 	if (ret < 0)
243 		goto out_i2c_error;
244 	pchip->mphase = regval & 0x0F;
245 
246 	/* set default data based on multi-phase config */
247 	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
248 		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
249 		pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
250 	}
251 	return ret;
252 
253 out_i2c_error:
254 	dev_err(pchip->dev, "i2c access error %s\n", __func__);
255 	return ret;
256 }
257 
258 #define lp8755_buck_desc(_id)\
259 {\
260 	.name = lp8755_rail(_id),\
261 	.id   = LP8755_BUCK##_id,\
262 	.ops  = &lp8755_buck_ops,\
263 	.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
264 	.uV_step = 10000,\
265 	.min_uV = 500000,\
266 	.type = REGULATOR_VOLTAGE,\
267 	.owner = THIS_MODULE,\
268 	.enable_reg = LP8755_REG_BUCK##_id,\
269 	.enable_mask = LP8755_BUCK_EN_M,\
270 	.vsel_reg = LP8755_REG_BUCK##_id,\
271 	.vsel_mask = LP8755_BUCK_VOUT_M,\
272 }
273 
274 static const struct regulator_desc lp8755_regulators[] = {
275 	lp8755_buck_desc(0),
276 	lp8755_buck_desc(1),
277 	lp8755_buck_desc(2),
278 	lp8755_buck_desc(3),
279 	lp8755_buck_desc(4),
280 	lp8755_buck_desc(5),
281 };
282 
283 static int lp8755_regulator_init(struct lp8755_chip *pchip)
284 {
285 	int ret, icnt, buck_num;
286 	struct lp8755_platform_data *pdata = pchip->pdata;
287 	struct regulator_config rconfig = { };
288 
289 	rconfig.regmap = pchip->regmap;
290 	rconfig.dev = pchip->dev;
291 	rconfig.driver_data = pchip;
292 
293 	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
294 		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
295 		rconfig.init_data = pdata->buck_data[buck_num];
296 		rconfig.of_node = pchip->dev->of_node;
297 		pchip->rdev[buck_num] =
298 		    devm_regulator_register(pchip->dev,
299 				    &lp8755_regulators[buck_num], &rconfig);
300 		if (IS_ERR(pchip->rdev[buck_num])) {
301 			ret = PTR_ERR(pchip->rdev[buck_num]);
302 			pchip->rdev[buck_num] = NULL;
303 			dev_err(pchip->dev, "regulator init failed: buck %d\n",
304 				buck_num);
305 			return ret;
306 		}
307 	}
308 
309 	return 0;
310 }
311 
312 static irqreturn_t lp8755_irq_handler(int irq, void *data)
313 {
314 	int ret, icnt;
315 	unsigned int flag0, flag1;
316 	struct lp8755_chip *pchip = data;
317 
318 	/* read flag0 register */
319 	ret = regmap_read(pchip->regmap, 0x0D, &flag0);
320 	if (ret < 0)
321 		goto err_i2c;
322 	/* clear flag register to pull up int. pin */
323 	ret = regmap_write(pchip->regmap, 0x0D, 0x00);
324 	if (ret < 0)
325 		goto err_i2c;
326 
327 	/* sent power fault detection event to specific regulator */
328 	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
329 		if ((flag0 & (0x4 << icnt))
330 		    && (pchip->irqmask & (0x04 << icnt))
331 		    && (pchip->rdev[icnt] != NULL)) {
332 			regulator_notifier_call_chain(pchip->rdev[icnt],
333 						      LP8755_EVENT_PWR_FAULT,
334 						      NULL);
335 		}
336 
337 	/* read flag1 register */
338 	ret = regmap_read(pchip->regmap, 0x0E, &flag1);
339 	if (ret < 0)
340 		goto err_i2c;
341 	/* clear flag register to pull up int. pin */
342 	ret = regmap_write(pchip->regmap, 0x0E, 0x00);
343 	if (ret < 0)
344 		goto err_i2c;
345 
346 	/* send OCP event to all regulator devices */
347 	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
348 		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
349 			if (pchip->rdev[icnt] != NULL) {
350 				regulator_notifier_call_chain(pchip->rdev[icnt],
351 							      LP8755_EVENT_OCP,
352 							      NULL);
353 			}
354 
355 	/* send OVP event to all regulator devices */
356 	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
357 		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
358 			if (pchip->rdev[icnt] != NULL) {
359 				regulator_notifier_call_chain(pchip->rdev[icnt],
360 							      LP8755_EVENT_OVP,
361 							      NULL);
362 			}
363 	return IRQ_HANDLED;
364 
365 err_i2c:
366 	dev_err(pchip->dev, "i2c access error %s\n", __func__);
367 	return IRQ_NONE;
368 }
369 
370 static int lp8755_int_config(struct lp8755_chip *pchip)
371 {
372 	int ret;
373 	unsigned int regval;
374 
375 	if (pchip->irq == 0) {
376 		dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
377 		return 0;
378 	}
379 
380 	ret = regmap_read(pchip->regmap, 0x0F, &regval);
381 	if (ret < 0) {
382 		dev_err(pchip->dev, "i2c access error %s\n", __func__);
383 		return ret;
384 	}
385 
386 	pchip->irqmask = regval;
387 	return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
388 					 lp8755_irq_handler,
389 					 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
390 					 "lp8755-irq", pchip);
391 }
392 
393 static const struct regmap_config lp8755_regmap = {
394 	.reg_bits = 8,
395 	.val_bits = 8,
396 	.max_register = LP8755_REG_MAX,
397 };
398 
399 static int lp8755_probe(struct i2c_client *client,
400 			const struct i2c_device_id *id)
401 {
402 	int ret, icnt;
403 	struct lp8755_chip *pchip;
404 	struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
405 
406 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
407 		dev_err(&client->dev, "i2c functionality check fail.\n");
408 		return -EOPNOTSUPP;
409 	}
410 
411 	pchip = devm_kzalloc(&client->dev,
412 			     sizeof(struct lp8755_chip), GFP_KERNEL);
413 	if (!pchip)
414 		return -ENOMEM;
415 
416 	pchip->dev = &client->dev;
417 	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
418 	if (IS_ERR(pchip->regmap)) {
419 		ret = PTR_ERR(pchip->regmap);
420 		dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
421 		return ret;
422 	}
423 	i2c_set_clientdata(client, pchip);
424 
425 	if (pdata != NULL) {
426 		pchip->pdata = pdata;
427 		pchip->mphase = pdata->mphase;
428 	} else {
429 		pchip->pdata = devm_kzalloc(pchip->dev,
430 					    sizeof(struct lp8755_platform_data),
431 					    GFP_KERNEL);
432 		if (!pchip->pdata)
433 			return -ENOMEM;
434 		ret = lp8755_init_data(pchip);
435 		if (ret < 0) {
436 			dev_err(&client->dev, "fail to initialize chip\n");
437 			return ret;
438 		}
439 	}
440 
441 	ret = lp8755_regulator_init(pchip);
442 	if (ret < 0) {
443 		dev_err(&client->dev, "fail to initialize regulators\n");
444 		goto err;
445 	}
446 
447 	pchip->irq = client->irq;
448 	ret = lp8755_int_config(pchip);
449 	if (ret < 0) {
450 		dev_err(&client->dev, "fail to irq config\n");
451 		goto err;
452 	}
453 
454 	return ret;
455 
456 err:
457 	/* output disable */
458 	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
459 		regmap_write(pchip->regmap, icnt, 0x00);
460 
461 	return ret;
462 }
463 
464 static int lp8755_remove(struct i2c_client *client)
465 {
466 	int icnt;
467 	struct lp8755_chip *pchip = i2c_get_clientdata(client);
468 
469 	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
470 		regmap_write(pchip->regmap, icnt, 0x00);
471 
472 	return 0;
473 }
474 
475 static const struct i2c_device_id lp8755_id[] = {
476 	{LP8755_NAME, 0},
477 	{}
478 };
479 
480 MODULE_DEVICE_TABLE(i2c, lp8755_id);
481 
482 static struct i2c_driver lp8755_i2c_driver = {
483 	.driver = {
484 		   .name = LP8755_NAME,
485 		   },
486 	.probe = lp8755_probe,
487 	.remove = lp8755_remove,
488 	.id_table = lp8755_id,
489 };
490 
491 static int __init lp8755_init(void)
492 {
493 	return i2c_add_driver(&lp8755_i2c_driver);
494 }
495 
496 subsys_initcall(lp8755_init);
497 
498 static void __exit lp8755_exit(void)
499 {
500 	i2c_del_driver(&lp8755_i2c_driver);
501 }
502 
503 module_exit(lp8755_exit);
504 
505 MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
506 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
507 MODULE_LICENSE("GPL v2");
508