aboutsummaryrefslogtreecommitdiff
path: root/drivers/regulator/tps51632-regulator.c
blob: 9392a7ca3d2dc6df9152cb1aeb13c776b856e253 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
/*
 * tps51632-regulator.c -- TI TPS51632
 *
 * Regulator driver for TPS51632 3-2-1 Phase D-Cap Step Down Driverless
 * Controller with serial VID control and DVFS.
 *
 * Copyright (c) 2012, NVIDIA Corporation.
 *
 * Author: Laxman Dewangan <ldewangan@nvidia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 * whether express or implied; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307, USA
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/tps51632-regulator.h>
#include <linux/slab.h>

/* Register definitions */
#define TPS51632_VOLTAGE_SELECT_REG		0x0
#define TPS51632_VOLTAGE_BASE_REG		0x1
#define TPS51632_OFFSET_REG			0x2
#define TPS51632_IMON_REG			0x3
#define TPS51632_VMAX_REG			0x4
#define TPS51632_DVFS_CONTROL_REG		0x5
#define TPS51632_POWER_STATE_REG		0x6
#define TPS51632_SLEW_REGS			0x7
#define TPS51632_FAULT_REG			0x14

#define TPS51632_MAX_REG			0x15

#define TPS51632_VOUT_MASK			0x7F
#define TPS51632_VOUT_OFFSET_MASK		0x1F
#define TPS51632_VMAX_MASK			0x7F
#define TPS51632_VMAX_LOCK			0x80

/* TPS51632_DVFS_CONTROL_REG */
#define TPS51632_DVFS_PWMEN			0x1
#define TPS51632_DVFS_STEP_20			0x2
#define TPS51632_DVFS_VMAX_PG			0x4
#define TPS51632_DVFS_PWMRST			0x8
#define TPS51632_DVFS_OCA_EN			0x10
#define TPS51632_DVFS_FCCM			0x20

/* TPS51632_POWER_STATE_REG */
#define TPS51632_POWER_STATE_MASK		0x03
#define TPS51632_POWER_STATE_MULTI_PHASE_CCM	0x0
#define TPS51632_POWER_STATE_SINGLE_PHASE_CCM	0x1
#define TPS51632_POWER_STATE_SINGLE_PHASE_DCM	0x2

#define TPS51632_MIN_VOLATGE			500000
#define TPS51632_MAX_VOLATGE			1520000
#define TPS51632_VOLATGE_STEP_10mV		10000
#define TPS51632_VOLATGE_STEP_20mV		20000
#define TPS51632_MAX_VSEL			0x7F
#define TPS51632_MIN_VSEL			0x19
#define TPS51632_DEFAULT_RAMP_DELAY		6000
#define TPS51632_VOLT_VSEL(uV)					\
		(DIV_ROUND_UP(uV - TPS51632_MIN_VOLATGE,	\
			TPS51632_VOLATGE_STEP_10mV) +		\
			TPS51632_MIN_VSEL)

/* TPS51632 chip information */
struct tps51632_chip {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_dev *rdev;
	struct regmap *regmap;
};

static int tps51632_dcdc_set_ramp_delay(struct regulator_dev *rdev,
		int ramp_delay)
{
	struct tps51632_chip *tps = rdev_get_drvdata(rdev);
	int bit = ramp_delay/6000;
	int ret;

	if (bit)
		bit--;
	ret = regmap_write(tps->regmap, TPS51632_SLEW_REGS, BIT(bit));
	if (ret < 0)
		dev_err(tps->dev, "SLEW reg write failed, err %d\n", ret);
	return ret;
}

static struct regulator_ops tps51632_dcdc_ops = {
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
	.set_ramp_delay		= tps51632_dcdc_set_ramp_delay,
};

static int tps51632_init_dcdc(struct tps51632_chip *tps,
		struct tps51632_regulator_platform_data *pdata)
{
	int ret;
	uint8_t	control = 0;
	int vsel;

	if (!pdata->enable_pwm_dvfs)
		goto skip_pwm_config;

	control |= TPS51632_DVFS_PWMEN;
	vsel = TPS51632_VOLT_VSEL(pdata->base_voltage_uV);
	ret = regmap_write(tps->regmap, TPS51632_VOLTAGE_BASE_REG, vsel);
	if (ret < 0) {
		dev_err(tps->dev, "BASE reg write failed, err %d\n", ret);
		return ret;
	}

	if (pdata->dvfs_step_20mV)
		control |= TPS51632_DVFS_STEP_20;

	if (pdata->max_voltage_uV) {
		unsigned int vmax;
		/**
		 * TPS51632 hw behavior: VMAX register can be write only
		 * once as it get locked after first write. The lock get
		 * reset only when device is power-reset.
		 * Write register only when lock bit is not enabled.
		 */
		ret = regmap_read(tps->regmap, TPS51632_VMAX_REG, &vmax);
		if (ret < 0) {
			dev_err(tps->dev, "VMAX read failed, err %d\n", ret);
			return ret;
		}
		if (!(vmax & TPS51632_VMAX_LOCK)) {
			vsel = TPS51632_VOLT_VSEL(pdata->max_voltage_uV);
			ret = regmap_write(tps->regmap, TPS51632_VMAX_REG,
					vsel);
			if (ret < 0) {
				dev_err(tps->dev,
					"VMAX write failed, err %d\n", ret);
				return ret;
			}
		}
	}

skip_pwm_config:
	ret = regmap_write(tps->regmap, TPS51632_DVFS_CONTROL_REG, control);
	if (ret < 0)
		dev_err(tps->dev, "DVFS reg write failed, err %d\n", ret);
	return ret;
}

static bool is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TPS51632_OFFSET_REG:
	case TPS51632_FAULT_REG:
	case TPS51632_IMON_REG:
		return true;
	default:
		return false;
	}
}

static bool is_read_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x08 ... 0x0F:
		return false;
	default:
		return true;
	}
}

static bool is_write_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TPS51632_VOLTAGE_SELECT_REG:
	case TPS51632_VOLTAGE_BASE_REG:
	case TPS51632_VMAX_REG:
	case TPS51632_DVFS_CONTROL_REG:
	case TPS51632_POWER_STATE_REG:
	case TPS51632_SLEW_REGS:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config tps51632_regmap_config = {
	.reg_bits		= 8,
	.val_bits		= 8,
	.writeable_reg		= is_write_reg,
	.readable_reg		= is_read_reg,
	.volatile_reg		= is_volatile_reg,
	.max_register		= TPS51632_MAX_REG - 1,
	.cache_type		= REGCACHE_RBTREE,
};

#if defined(CONFIG_OF)
static const struct of_device_id tps51632_of_match[] = {
	{ .compatible = "ti,tps51632",},
	{},
};
MODULE_DEVICE_TABLE(of, tps51632_of_match);

static struct tps51632_regulator_platform_data *
	of_get_tps51632_platform_data(struct device *dev)
{
	struct tps51632_regulator_platform_data *pdata;
	struct device_node *np = dev->of_node;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
		dev_err(dev, "Memory alloc failed for platform data\n");
		return NULL;
	}

	pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
	if (!pdata->reg_init_data) {
		dev_err(dev, "Not able to get OF regulator init data\n");
		return NULL;
	}

	pdata->enable_pwm_dvfs =
			of_property_read_bool(np, "ti,enable-pwm-dvfs");
	pdata->dvfs_step_20mV = of_property_read_bool(np, "ti,dvfs-step-20mV");

	pdata->base_voltage_uV = pdata->reg_init_data->constraints.min_uV ? :
					TPS51632_MIN_VOLATGE;
	pdata->max_voltage_uV = pdata->reg_init_data->constraints.max_uV ? :
					TPS51632_MAX_VOLATGE;
	return pdata;
}
#else
static struct tps51632_regulator_platform_data *
	of_get_tps51632_platform_data(struct device *dev)
{
	return NULL;
}
#endif

static int tps51632_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct tps51632_regulator_platform_data *pdata;
	struct regulator_dev *rdev;
	struct tps51632_chip *tps;
	int ret;
	struct regulator_config config = { };

	if (client->dev.of_node) {
		const struct of_device_id *match;
		match = of_match_device(of_match_ptr(tps51632_of_match),
				&client->dev);
		if (!match) {
			dev_err(&client->dev, "Error: No device match found\n");
			return -ENODEV;
		}
	}

	pdata = dev_get_platdata(&client->dev);
	if (!pdata && client->dev.of_node)
		pdata = of_get_tps51632_platform_data(&client->dev);
	if (!pdata) {
		dev_err(&client->dev, "No Platform data\n");
		return -EINVAL;
	}

	if (pdata->enable_pwm_dvfs) {
		if ((pdata->base_voltage_uV < TPS51632_MIN_VOLATGE) ||
		    (pdata->base_voltage_uV > TPS51632_MAX_VOLATGE)) {
			dev_err(&client->dev, "Invalid base_voltage_uV setting\n");
			return -EINVAL;
		}

		if ((pdata->max_voltage_uV) &&
		    ((pdata->max_voltage_uV < TPS51632_MIN_VOLATGE) ||
		     (pdata->max_voltage_uV > TPS51632_MAX_VOLATGE))) {
			dev_err(&client->dev, "Invalid max_voltage_uV setting\n");
			return -EINVAL;
		}
	}

	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
	if (!tps) {
		dev_err(&client->dev, "Memory allocation failed\n");
		return -ENOMEM;
	}

	tps->dev = &client->dev;
	tps->desc.name = id->name;
	tps->desc.id = 0;
	tps->desc.ramp_delay = TPS51632_DEFAULT_RAMP_DELAY;
	tps->desc.min_uV = TPS51632_MIN_VOLATGE;
	tps->desc.uV_step = TPS51632_VOLATGE_STEP_10mV;
	tps->desc.linear_min_sel = TPS51632_MIN_VSEL;
	tps->desc.n_voltages = TPS51632_MAX_VSEL + 1;
	tps->desc.ops = &tps51632_dcdc_ops;
	tps->desc.type = REGULATOR_VOLTAGE;
	tps->desc.owner = THIS_MODULE;

	if (pdata->enable_pwm_dvfs)
		tps->desc.vsel_reg = TPS51632_VOLTAGE_BASE_REG;
	else
		tps->desc.vsel_reg = TPS51632_VOLTAGE_SELECT_REG;
	tps->desc.vsel_mask = TPS51632_VOUT_MASK;

	tps->regmap = devm_regmap_init_i2c(client, &tps51632_regmap_config);
	if (IS_ERR(tps->regmap)) {
		ret = PTR_ERR(tps->regmap);
		dev_err(&client->dev, "regmap init failed, err %d\n", ret);
		return ret;
	}
	i2c_set_clientdata(client, tps);

	ret = tps51632_init_dcdc(tps, pdata);
	if (ret < 0) {
		dev_err(tps->dev, "Init failed, err = %d\n", ret);
		return ret;
	}

	/* Register the regulators */
	config.dev = &client->dev;
	config.init_data = pdata->reg_init_data;
	config.driver_data = tps;
	config.regmap = tps->regmap;
	config.of_node = client->dev.of_node;

	rdev = regulator_register(&tps->desc, &config);
	if (IS_ERR(rdev)) {
		dev_err(tps->dev, "regulator register failed\n");
		return PTR_ERR(rdev);
	}

	tps->rdev = rdev;
	return 0;
}

static int tps51632_remove(struct i2c_client *client)
{
	struct tps51632_chip *tps = i2c_get_clientdata(client);

	regulator_unregister(tps->rdev);
	return 0;
}

static const struct i2c_device_id tps51632_id[] = {
	{.name = "tps51632",},
	{},
};

MODULE_DEVICE_TABLE(i2c, tps51632_id);

static struct i2c_driver tps51632_i2c_driver = {
	.driver = {
		.name = "tps51632",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(tps51632_of_match),
	},
	.probe = tps51632_probe,
	.remove = tps51632_remove,
	.id_table = tps51632_id,
};

static int __init tps51632_init(void)
{
	return i2c_add_driver(&tps51632_i2c_driver);
}
subsys_initcall(tps51632_init);

static void __exit tps51632_cleanup(void)
{
	i2c_del_driver(&tps51632_i2c_driver);
}
module_exit(tps51632_cleanup);

MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_DESCRIPTION("TPS51632 voltage regulator driver");
MODULE_LICENSE("GPL v2");