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
 35struct lp8755_mphase {
 36	int nreg;
 37	int buck_num[LP8755_BUCK_MAX];
 38};
 39
 40struct 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
 52static 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
 66static 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;
104err_i2c:
105	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
106	return ret;
107}
108
109static 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
134err_i2c:
135	dev_err(&rdev->dev, "i2c access error %s\n", __func__);
136	return 0;
137}
138
139static const unsigned int lp8755_buck_ramp_table[] = {
140	30000, 15000, 7500, 3800, 1900, 940, 470, 230
141};
142
143static const struct regulator_ops lp8755_buck_ops = {
144	.map_voltage = regulator_map_voltage_linear,
145	.list_voltage = regulator_list_voltage_linear,
146	.set_voltage_sel = regulator_set_voltage_sel_regmap,
147	.get_voltage_sel = regulator_get_voltage_sel_regmap,
148	.enable = regulator_enable_regmap,
149	.disable = regulator_disable_regmap,
150	.is_enabled = regulator_is_enabled_regmap,
151	.enable_time = lp8755_buck_enable_time,
152	.set_mode = lp8755_buck_set_mode,
153	.get_mode = lp8755_buck_get_mode,
154	.set_ramp_delay = regulator_set_ramp_delay_regmap,
155};
156
157#define lp8755_rail(_id) "lp8755_buck"#_id
158#define lp8755_buck_init(_id)\
159{\
160	.constraints = {\
161		.name = lp8755_rail(_id),\
162		.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
163		.min_uV = 500000,\
164		.max_uV = 1675000,\
165	},\
166}
167
168static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
169	[LP8755_BUCK0] = lp8755_buck_init(0),
170	[LP8755_BUCK1] = lp8755_buck_init(1),
171	[LP8755_BUCK2] = lp8755_buck_init(2),
172	[LP8755_BUCK3] = lp8755_buck_init(3),
173	[LP8755_BUCK4] = lp8755_buck_init(4),
174	[LP8755_BUCK5] = lp8755_buck_init(5),
175};
176
177static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
178	{ 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
179	{ 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
180	       LP8755_BUCK4, LP8755_BUCK5 } },
181	{ 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
182	       LP8755_BUCK5} },
183	{ 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
184	{ 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
185	{ 2, { LP8755_BUCK0, LP8755_BUCK5} },
186	{ 1, { LP8755_BUCK0} },
187	{ 2, { LP8755_BUCK0, LP8755_BUCK3} },
188	{ 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
189};
190
191static int lp8755_init_data(struct lp8755_chip *pchip)
192{
193	unsigned int regval;
194	int ret, icnt, buck_num;
195	struct lp8755_platform_data *pdata = pchip->pdata;
196
197	/* read back  muti-phase configuration */
198	ret = regmap_read(pchip->regmap, 0x3D, &regval);
199	if (ret < 0)
200		goto out_i2c_error;
201	pchip->mphase = regval & 0x0F;
202
203	/* set default data based on multi-phase config */
204	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
205		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
206		pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
207	}
208	return ret;
209
210out_i2c_error:
211	dev_err(pchip->dev, "i2c access error %s\n", __func__);
212	return ret;
213}
214
215#define lp8755_buck_desc(_id)\
216{\
217	.name = lp8755_rail(_id),\
218	.id   = LP8755_BUCK##_id,\
219	.ops  = &lp8755_buck_ops,\
220	.n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
221	.uV_step = 10000,\
222	.min_uV = 500000,\
223	.type = REGULATOR_VOLTAGE,\
224	.owner = THIS_MODULE,\
225	.enable_reg = LP8755_REG_BUCK##_id,\
226	.enable_mask = LP8755_BUCK_EN_M,\
227	.vsel_reg = LP8755_REG_BUCK##_id,\
228	.vsel_mask = LP8755_BUCK_VOUT_M,\
229	.ramp_reg = (LP8755_BUCK##_id) + 0x7,\
230	.ramp_mask = 0x7,\
231	.ramp_delay_table = lp8755_buck_ramp_table,\
232	.n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\
233}
234
235static const struct regulator_desc lp8755_regulators[] = {
236	lp8755_buck_desc(0),
237	lp8755_buck_desc(1),
238	lp8755_buck_desc(2),
239	lp8755_buck_desc(3),
240	lp8755_buck_desc(4),
241	lp8755_buck_desc(5),
242};
243
244static int lp8755_regulator_init(struct lp8755_chip *pchip)
245{
246	int ret, icnt, buck_num;
247	struct lp8755_platform_data *pdata = pchip->pdata;
248	struct regulator_config rconfig = { };
249
250	rconfig.regmap = pchip->regmap;
251	rconfig.dev = pchip->dev;
252	rconfig.driver_data = pchip;
253
254	for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
255		buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
256		rconfig.init_data = pdata->buck_data[buck_num];
257		rconfig.of_node = pchip->dev->of_node;
258		pchip->rdev[buck_num] =
259		    devm_regulator_register(pchip->dev,
260				    &lp8755_regulators[buck_num], &rconfig);
261		if (IS_ERR(pchip->rdev[buck_num])) {
262			ret = PTR_ERR(pchip->rdev[buck_num]);
263			pchip->rdev[buck_num] = NULL;
264			dev_err(pchip->dev, "regulator init failed: buck %d\n",
265				buck_num);
266			return ret;
267		}
268	}
269
270	return 0;
271}
272
273static irqreturn_t lp8755_irq_handler(int irq, void *data)
274{
275	int ret, icnt;
276	unsigned int flag0, flag1;
277	struct lp8755_chip *pchip = data;
278
279	/* read flag0 register */
280	ret = regmap_read(pchip->regmap, 0x0D, &flag0);
281	if (ret < 0)
282		goto err_i2c;
283	/* clear flag register to pull up int. pin */
284	ret = regmap_write(pchip->regmap, 0x0D, 0x00);
285	if (ret < 0)
286		goto err_i2c;
287
288	/* sent power fault detection event to specific regulator */
289	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
290		if ((flag0 & (0x4 << icnt))
291		    && (pchip->irqmask & (0x04 << icnt))
292		    && (pchip->rdev[icnt] != NULL)) {
293			regulator_notifier_call_chain(pchip->rdev[icnt],
294						      LP8755_EVENT_PWR_FAULT,
295						      NULL);
296		}
297
298	/* read flag1 register */
299	ret = regmap_read(pchip->regmap, 0x0E, &flag1);
300	if (ret < 0)
301		goto err_i2c;
302	/* clear flag register to pull up int. pin */
303	ret = regmap_write(pchip->regmap, 0x0E, 0x00);
304	if (ret < 0)
305		goto err_i2c;
306
307	/* send OCP event to all regulator devices */
308	if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
309		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
310			if (pchip->rdev[icnt] != NULL) {
311				regulator_notifier_call_chain(pchip->rdev[icnt],
312							      LP8755_EVENT_OCP,
313							      NULL);
314			}
315
316	/* send OVP event to all regulator devices */
317	if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
318		for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
319			if (pchip->rdev[icnt] != NULL) {
320				regulator_notifier_call_chain(pchip->rdev[icnt],
321							      LP8755_EVENT_OVP,
322							      NULL);
323			}
324	return IRQ_HANDLED;
325
326err_i2c:
327	dev_err(pchip->dev, "i2c access error %s\n", __func__);
328	return IRQ_NONE;
329}
330
331static int lp8755_int_config(struct lp8755_chip *pchip)
332{
333	int ret;
334	unsigned int regval;
335
336	if (pchip->irq == 0) {
337		dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
338		return 0;
339	}
340
341	ret = regmap_read(pchip->regmap, 0x0F, &regval);
342	if (ret < 0) {
343		dev_err(pchip->dev, "i2c access error %s\n", __func__);
344		return ret;
345	}
346
347	pchip->irqmask = regval;
348	return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
349					 lp8755_irq_handler,
350					 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
351					 "lp8755-irq", pchip);
352}
353
354static const struct regmap_config lp8755_regmap = {
355	.reg_bits = 8,
356	.val_bits = 8,
357	.max_register = LP8755_REG_MAX,
358};
359
360static int lp8755_probe(struct i2c_client *client,
361			const struct i2c_device_id *id)
362{
363	int ret, icnt;
364	struct lp8755_chip *pchip;
365	struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
366
367	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
368		dev_err(&client->dev, "i2c functionality check fail.\n");
369		return -EOPNOTSUPP;
370	}
371
372	pchip = devm_kzalloc(&client->dev,
373			     sizeof(struct lp8755_chip), GFP_KERNEL);
374	if (!pchip)
375		return -ENOMEM;
376
377	pchip->dev = &client->dev;
378	pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
379	if (IS_ERR(pchip->regmap)) {
380		ret = PTR_ERR(pchip->regmap);
381		dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
382		return ret;
383	}
384	i2c_set_clientdata(client, pchip);
385
386	if (pdata != NULL) {
387		pchip->pdata = pdata;
388		pchip->mphase = pdata->mphase;
389	} else {
390		pchip->pdata = devm_kzalloc(pchip->dev,
391					    sizeof(struct lp8755_platform_data),
392					    GFP_KERNEL);
393		if (!pchip->pdata)
394			return -ENOMEM;
395		ret = lp8755_init_data(pchip);
396		if (ret < 0) {
397			dev_err(&client->dev, "fail to initialize chip\n");
398			return ret;
399		}
400	}
401
402	ret = lp8755_regulator_init(pchip);
403	if (ret < 0) {
404		dev_err(&client->dev, "fail to initialize regulators\n");
405		goto err;
406	}
407
408	pchip->irq = client->irq;
409	ret = lp8755_int_config(pchip);
410	if (ret < 0) {
411		dev_err(&client->dev, "fail to irq config\n");
412		goto err;
413	}
414
415	return ret;
416
417err:
418	/* output disable */
419	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
420		regmap_write(pchip->regmap, icnt, 0x00);
421
422	return ret;
423}
424
425static int lp8755_remove(struct i2c_client *client)
426{
427	int icnt;
428	struct lp8755_chip *pchip = i2c_get_clientdata(client);
429
430	for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
431		regmap_write(pchip->regmap, icnt, 0x00);
432
433	return 0;
434}
435
436static const struct i2c_device_id lp8755_id[] = {
437	{LP8755_NAME, 0},
438	{}
439};
440
441MODULE_DEVICE_TABLE(i2c, lp8755_id);
442
443static struct i2c_driver lp8755_i2c_driver = {
444	.driver = {
445		   .name = LP8755_NAME,
446		   },
447	.probe = lp8755_probe,
448	.remove = lp8755_remove,
449	.id_table = lp8755_id,
450};
451
452static int __init lp8755_init(void)
453{
454	return i2c_add_driver(&lp8755_i2c_driver);
455}
456
457subsys_initcall(lp8755_init);
458
459static void __exit lp8755_exit(void)
460{
461	i2c_del_driver(&lp8755_i2c_driver);
462}
463
464module_exit(lp8755_exit);
465
466MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
467MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
468MODULE_LICENSE("GPL v2");