PageRenderTime 83ms CodeModel.GetById 23ms app.highlight 54ms RepoModel.GetById 1ms app.codeStats 1ms

/drivers/regulator/tps6507x-regulator.c

http://github.com/mirrors/linux
C | 468 lines | 366 code | 72 blank | 30 comment | 29 complexity | 20d3de29238832a4fd0c08c4b8a80bd5 MD5 | raw file
  1/*
  2 * tps6507x-regulator.c
  3 *
  4 * Regulator driver for TPS65073 PMIC
  5 *
  6 * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
  7 *
  8 * This program is free software; you can redistribute it and/or
  9 * modify it under the terms of the GNU General Public License as
 10 * published by the Free Software Foundation version 2.
 11 *
 12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
 13 * whether express or implied; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 15 * General Public License for more details.
 16 */
 17
 18#include <linux/kernel.h>
 19#include <linux/module.h>
 20#include <linux/init.h>
 21#include <linux/err.h>
 22#include <linux/platform_device.h>
 23#include <linux/regulator/driver.h>
 24#include <linux/regulator/machine.h>
 25#include <linux/regulator/tps6507x.h>
 26#include <linux/of.h>
 27#include <linux/slab.h>
 28#include <linux/mfd/tps6507x.h>
 29#include <linux/regulator/of_regulator.h>
 30
 31/* DCDC's */
 32#define TPS6507X_DCDC_1				0
 33#define TPS6507X_DCDC_2				1
 34#define TPS6507X_DCDC_3				2
 35/* LDOs */
 36#define TPS6507X_LDO_1				3
 37#define TPS6507X_LDO_2				4
 38
 39#define TPS6507X_MAX_REG_ID			TPS6507X_LDO_2
 40
 41/* Number of step-down converters available */
 42#define TPS6507X_NUM_DCDC			3
 43/* Number of LDO voltage regulators  available */
 44#define TPS6507X_NUM_LDO			2
 45/* Number of total regulators available */
 46#define TPS6507X_NUM_REGULATOR		(TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
 47
 48/* Supported voltage values for regulators (in microVolts) */
 49static const unsigned int VDCDCx_VSEL_table[] = {
 50	725000, 750000, 775000, 800000,
 51	825000, 850000, 875000, 900000,
 52	925000, 950000, 975000, 1000000,
 53	1025000, 1050000, 1075000, 1100000,
 54	1125000, 1150000, 1175000, 1200000,
 55	1225000, 1250000, 1275000, 1300000,
 56	1325000, 1350000, 1375000, 1400000,
 57	1425000, 1450000, 1475000, 1500000,
 58	1550000, 1600000, 1650000, 1700000,
 59	1750000, 1800000, 1850000, 1900000,
 60	1950000, 2000000, 2050000, 2100000,
 61	2150000, 2200000, 2250000, 2300000,
 62	2350000, 2400000, 2450000, 2500000,
 63	2550000, 2600000, 2650000, 2700000,
 64	2750000, 2800000, 2850000, 2900000,
 65	3000000, 3100000, 3200000, 3300000,
 66};
 67
 68static const unsigned int LDO1_VSEL_table[] = {
 69	1000000, 1100000, 1200000, 1250000,
 70	1300000, 1350000, 1400000, 1500000,
 71	1600000, 1800000, 2500000, 2750000,
 72	2800000, 3000000, 3100000, 3300000,
 73};
 74
 75/* The voltage mapping table for LDO2 is the same as VDCDCx */
 76#define LDO2_VSEL_table VDCDCx_VSEL_table
 77
 78struct tps_info {
 79	const char *name;
 80	u8 table_len;
 81	const unsigned int *table;
 82
 83	/* Does DCDC high or the low register defines output voltage? */
 84	bool defdcdc_default;
 85};
 86
 87static struct tps_info tps6507x_pmic_regs[] = {
 88	{
 89		.name = "VDCDC1",
 90		.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 91		.table = VDCDCx_VSEL_table,
 92	},
 93	{
 94		.name = "VDCDC2",
 95		.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 96		.table = VDCDCx_VSEL_table,
 97	},
 98	{
 99		.name = "VDCDC3",
100		.table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
101		.table = VDCDCx_VSEL_table,
102	},
103	{
104		.name = "LDO1",
105		.table_len = ARRAY_SIZE(LDO1_VSEL_table),
106		.table = LDO1_VSEL_table,
107	},
108	{
109		.name = "LDO2",
110		.table_len = ARRAY_SIZE(LDO2_VSEL_table),
111		.table = LDO2_VSEL_table,
112	},
113};
114
115struct tps6507x_pmic {
116	struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
117	struct tps6507x_dev *mfd;
118	struct tps_info *info[TPS6507X_NUM_REGULATOR];
119	struct mutex io_lock;
120};
121static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
122{
123	u8 val;
124	int err;
125
126	err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
127
128	if (err)
129		return err;
130
131	return val;
132}
133
134static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
135{
136	return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
137}
138
139static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
140{
141	int err, data;
142
143	mutex_lock(&tps->io_lock);
144
145	data = tps6507x_pmic_read(tps, reg);
146	if (data < 0) {
147		dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
148		err = data;
149		goto out;
150	}
151
152	data |= mask;
153	err = tps6507x_pmic_write(tps, reg, data);
154	if (err)
155		dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
156
157out:
158	mutex_unlock(&tps->io_lock);
159	return err;
160}
161
162static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
163{
164	int err, data;
165
166	mutex_lock(&tps->io_lock);
167
168	data = tps6507x_pmic_read(tps, reg);
169	if (data < 0) {
170		dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
171		err = data;
172		goto out;
173	}
174
175	data &= ~mask;
176	err = tps6507x_pmic_write(tps, reg, data);
177	if (err)
178		dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
179
180out:
181	mutex_unlock(&tps->io_lock);
182	return err;
183}
184
185static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
186{
187	int data;
188
189	mutex_lock(&tps->io_lock);
190
191	data = tps6507x_pmic_read(tps, reg);
192	if (data < 0)
193		dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
194
195	mutex_unlock(&tps->io_lock);
196	return data;
197}
198
199static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
200{
201	int err;
202
203	mutex_lock(&tps->io_lock);
204
205	err = tps6507x_pmic_write(tps, reg, val);
206	if (err < 0)
207		dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
208
209	mutex_unlock(&tps->io_lock);
210	return err;
211}
212
213static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
214{
215	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
216	int data, rid = rdev_get_id(dev);
217	u8 shift;
218
219	if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
220		return -EINVAL;
221
222	shift = TPS6507X_MAX_REG_ID - rid;
223	data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
224
225	if (data < 0)
226		return data;
227	else
228		return (data & 1<<shift) ? 1 : 0;
229}
230
231static int tps6507x_pmic_enable(struct regulator_dev *dev)
232{
233	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
234	int rid = rdev_get_id(dev);
235	u8 shift;
236
237	if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
238		return -EINVAL;
239
240	shift = TPS6507X_MAX_REG_ID - rid;
241	return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
242}
243
244static int tps6507x_pmic_disable(struct regulator_dev *dev)
245{
246	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
247	int rid = rdev_get_id(dev);
248	u8 shift;
249
250	if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
251		return -EINVAL;
252
253	shift = TPS6507X_MAX_REG_ID - rid;
254	return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
255					1 << shift);
256}
257
258static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
259{
260	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
261	int data, rid = rdev_get_id(dev);
262	u8 reg, mask;
263
264	switch (rid) {
265	case TPS6507X_DCDC_1:
266		reg = TPS6507X_REG_DEFDCDC1;
267		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
268		break;
269	case TPS6507X_DCDC_2:
270		if (tps->info[rid]->defdcdc_default)
271			reg = TPS6507X_REG_DEFDCDC2_HIGH;
272		else
273			reg = TPS6507X_REG_DEFDCDC2_LOW;
274		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
275		break;
276	case TPS6507X_DCDC_3:
277		if (tps->info[rid]->defdcdc_default)
278			reg = TPS6507X_REG_DEFDCDC3_HIGH;
279		else
280			reg = TPS6507X_REG_DEFDCDC3_LOW;
281		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
282		break;
283	case TPS6507X_LDO_1:
284		reg = TPS6507X_REG_LDO_CTRL1;
285		mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
286		break;
287	case TPS6507X_LDO_2:
288		reg = TPS6507X_REG_DEFLDO2;
289		mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
290		break;
291	default:
292		return -EINVAL;
293	}
294
295	data = tps6507x_pmic_reg_read(tps, reg);
296	if (data < 0)
297		return data;
298
299	data &= mask;
300	return data;
301}
302
303static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
304					  unsigned selector)
305{
306	struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
307	int data, rid = rdev_get_id(dev);
308	u8 reg, mask;
309
310	switch (rid) {
311	case TPS6507X_DCDC_1:
312		reg = TPS6507X_REG_DEFDCDC1;
313		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
314		break;
315	case TPS6507X_DCDC_2:
316		if (tps->info[rid]->defdcdc_default)
317			reg = TPS6507X_REG_DEFDCDC2_HIGH;
318		else
319			reg = TPS6507X_REG_DEFDCDC2_LOW;
320		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
321		break;
322	case TPS6507X_DCDC_3:
323		if (tps->info[rid]->defdcdc_default)
324			reg = TPS6507X_REG_DEFDCDC3_HIGH;
325		else
326			reg = TPS6507X_REG_DEFDCDC3_LOW;
327		mask = TPS6507X_DEFDCDCX_DCDC_MASK;
328		break;
329	case TPS6507X_LDO_1:
330		reg = TPS6507X_REG_LDO_CTRL1;
331		mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
332		break;
333	case TPS6507X_LDO_2:
334		reg = TPS6507X_REG_DEFLDO2;
335		mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
336		break;
337	default:
338		return -EINVAL;
339	}
340
341	data = tps6507x_pmic_reg_read(tps, reg);
342	if (data < 0)
343		return data;
344
345	data &= ~mask;
346	data |= selector;
347
348	return tps6507x_pmic_reg_write(tps, reg, data);
349}
350
351static const struct regulator_ops tps6507x_pmic_ops = {
352	.is_enabled = tps6507x_pmic_is_enabled,
353	.enable = tps6507x_pmic_enable,
354	.disable = tps6507x_pmic_disable,
355	.get_voltage_sel = tps6507x_pmic_get_voltage_sel,
356	.set_voltage_sel = tps6507x_pmic_set_voltage_sel,
357	.list_voltage = regulator_list_voltage_table,
358	.map_voltage = regulator_map_voltage_ascend,
359};
360
361static int tps6507x_pmic_of_parse_cb(struct device_node *np,
362				     const struct regulator_desc *desc,
363				     struct regulator_config *config)
364{
365	struct tps6507x_pmic *tps = config->driver_data;
366	struct tps_info *info = tps->info[desc->id];
367	u32 prop;
368	int ret;
369
370	ret = of_property_read_u32(np, "ti,defdcdc_default", &prop);
371	if (!ret)
372		info->defdcdc_default = prop;
373
374	return 0;
375}
376
377static int tps6507x_pmic_probe(struct platform_device *pdev)
378{
379	struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
380	struct tps_info *info = &tps6507x_pmic_regs[0];
381	struct regulator_config config = { };
382	struct regulator_init_data *init_data = NULL;
383	struct regulator_dev *rdev;
384	struct tps6507x_pmic *tps;
385	struct tps6507x_board *tps_board;
386	int i;
387
388	/**
389	 * tps_board points to pmic related constants
390	 * coming from the board-evm file.
391	 */
392
393	tps_board = dev_get_platdata(tps6507x_dev->dev);
394	if (tps_board)
395		init_data = tps_board->tps6507x_pmic_init_data;
396
397	tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
398	if (!tps)
399		return -ENOMEM;
400
401	mutex_init(&tps->io_lock);
402
403	/* common for all regulators */
404	tps->mfd = tps6507x_dev;
405
406	for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++) {
407		/* Register the regulators */
408		tps->info[i] = info;
409		if (init_data && init_data[i].driver_data) {
410			struct tps6507x_reg_platform_data *data =
411					init_data[i].driver_data;
412			info->defdcdc_default = data->defdcdc_default;
413		}
414
415		tps->desc[i].name = info->name;
416		tps->desc[i].of_match = of_match_ptr(info->name);
417		tps->desc[i].regulators_node = of_match_ptr("regulators");
418		tps->desc[i].of_parse_cb = tps6507x_pmic_of_parse_cb;
419		tps->desc[i].id = i;
420		tps->desc[i].n_voltages = info->table_len;
421		tps->desc[i].volt_table = info->table;
422		tps->desc[i].ops = &tps6507x_pmic_ops;
423		tps->desc[i].type = REGULATOR_VOLTAGE;
424		tps->desc[i].owner = THIS_MODULE;
425
426		config.dev = tps6507x_dev->dev;
427		config.init_data = init_data;
428		config.driver_data = tps;
429
430		rdev = devm_regulator_register(&pdev->dev, &tps->desc[i],
431					       &config);
432		if (IS_ERR(rdev)) {
433			dev_err(tps6507x_dev->dev,
434				"failed to register %s regulator\n",
435				pdev->name);
436			return PTR_ERR(rdev);
437		}
438	}
439
440	tps6507x_dev->pmic = tps;
441	platform_set_drvdata(pdev, tps6507x_dev);
442
443	return 0;
444}
445
446static struct platform_driver tps6507x_pmic_driver = {
447	.driver = {
448		.name = "tps6507x-pmic",
449	},
450	.probe = tps6507x_pmic_probe,
451};
452
453static int __init tps6507x_pmic_init(void)
454{
455	return platform_driver_register(&tps6507x_pmic_driver);
456}
457subsys_initcall(tps6507x_pmic_init);
458
459static void __exit tps6507x_pmic_cleanup(void)
460{
461	platform_driver_unregister(&tps6507x_pmic_driver);
462}
463module_exit(tps6507x_pmic_cleanup);
464
465MODULE_AUTHOR("Texas Instruments");
466MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
467MODULE_LICENSE("GPL v2");
468MODULE_ALIAS("platform:tps6507x-pmic");