1/*
  2 * tps65218-regulator.c
  3 *
  4 * Regulator driver for TPS65218 PMIC
  5 *
  6 * Copyright (C) 2014 Texas Instruments 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 version 2 as
 10 * published by the Free Software Foundation.
 11 *
 12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 13 * kind, whether expressed or implied; without even the implied warranty
 14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15 * GNU General Public License version 2 for more details.
 16 */
 17
 18#include <linux/kernel.h>
 19#include <linux/module.h>
 20#include <linux/device.h>
 21#include <linux/init.h>
 22#include <linux/err.h>
 23#include <linux/platform_device.h>
 24#include <linux/of_device.h>
 25#include <linux/regulator/of_regulator.h>
 26#include <linux/regulator/driver.h>
 27#include <linux/regulator/machine.h>
 28#include <linux/mfd/tps65218.h>
 29
 30enum tps65218_regulators { DCDC1, DCDC2, DCDC3, DCDC4,
 31			   DCDC5, DCDC6, LDO1, LS3 };
 32
 33#define TPS65218_REGULATOR(_name, _id, _type, _ops, _n, _vr, _vm, _er, _em, \
 34			    _cr, _cm, _lr, _nlr, _delay, _fuv)		\
 35	{							\
 36		.name			= _name,		\
 37		.id			= _id,			\
 38		.ops			= &_ops,		\
 39		.n_voltages		= _n,			\
 40		.type			= _type,	\
 41		.owner			= THIS_MODULE,		\
 42		.vsel_reg		= _vr,			\
 43		.vsel_mask		= _vm,			\
 44		.csel_reg		= _cr,			\
 45		.csel_mask		= _cm,			\
 46		.enable_reg		= _er,			\
 47		.enable_mask		= _em,			\
 48		.volt_table		= NULL,			\
 49		.linear_ranges		= _lr,			\
 50		.n_linear_ranges	= _nlr,			\
 51		.ramp_delay		= _delay,		\
 52		.fixed_uV		= _fuv			\
 53	}							\
 54
 55#define TPS65218_INFO(_id, _nm, _min, _max)	\
 56	[_id] = {					\
 57		.id		= _id,			\
 58		.name		= _nm,			\
 59		.min_uV		= _min,			\
 60		.max_uV		= _max,			\
 61	}
 62
 63static const struct regulator_linear_range dcdc1_dcdc2_ranges[] = {
 64	REGULATOR_LINEAR_RANGE(850000, 0x0, 0x32, 10000),
 65	REGULATOR_LINEAR_RANGE(1375000, 0x33, 0x3f, 25000),
 66};
 67
 68static const struct regulator_linear_range ldo1_dcdc3_ranges[] = {
 69	REGULATOR_LINEAR_RANGE(900000, 0x0, 0x1a, 25000),
 70	REGULATOR_LINEAR_RANGE(1600000, 0x1b, 0x3f, 50000),
 71};
 72
 73static const struct regulator_linear_range dcdc4_ranges[] = {
 74	REGULATOR_LINEAR_RANGE(1175000, 0x0, 0xf, 25000),
 75	REGULATOR_LINEAR_RANGE(1600000, 0x10, 0x34, 50000),
 76};
 77
 78static struct tps_info tps65218_pmic_regs[] = {
 79	TPS65218_INFO(DCDC1, "DCDC1", 850000, 1675000),
 80	TPS65218_INFO(DCDC2, "DCDC2", 850000, 1675000),
 81	TPS65218_INFO(DCDC3, "DCDC3", 900000, 3400000),
 82	TPS65218_INFO(DCDC4, "DCDC4", 1175000, 3400000),
 83	TPS65218_INFO(DCDC5, "DCDC5", 1000000, 1000000),
 84	TPS65218_INFO(DCDC6, "DCDC6", 1800000, 1800000),
 85	TPS65218_INFO(LDO1, "LDO1", 900000, 3400000),
 86	TPS65218_INFO(LS3, "LS3", -1, -1),
 87};
 88
 89#define TPS65218_OF_MATCH(comp, label) \
 90	{ \
 91		.compatible = comp, \
 92		.data = &label, \
 93	}
 94
 95static const struct of_device_id tps65218_of_match[] = {
 96	TPS65218_OF_MATCH("ti,tps65218-dcdc1", tps65218_pmic_regs[DCDC1]),
 97	TPS65218_OF_MATCH("ti,tps65218-dcdc2", tps65218_pmic_regs[DCDC2]),
 98	TPS65218_OF_MATCH("ti,tps65218-dcdc3", tps65218_pmic_regs[DCDC3]),
 99	TPS65218_OF_MATCH("ti,tps65218-dcdc4", tps65218_pmic_regs[DCDC4]),
100	TPS65218_OF_MATCH("ti,tps65218-dcdc5", tps65218_pmic_regs[DCDC5]),
101	TPS65218_OF_MATCH("ti,tps65218-dcdc6", tps65218_pmic_regs[DCDC6]),
102	TPS65218_OF_MATCH("ti,tps65218-ldo1", tps65218_pmic_regs[LDO1]),
103	TPS65218_OF_MATCH("ti,tps65218-ls3", tps65218_pmic_regs[LS3]),
104	{ }
105};
106MODULE_DEVICE_TABLE(of, tps65218_of_match);
107
108static int tps65218_pmic_set_voltage_sel(struct regulator_dev *dev,
109					 unsigned selector)
110{
111	int ret;
112	struct tps65218 *tps = rdev_get_drvdata(dev);
113	unsigned int rid = rdev_get_id(dev);
114
115	/* Set the voltage based on vsel value and write protect level is 2 */
116	ret = tps65218_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
117				selector, TPS65218_PROTECT_L1);
118
119	/* Set GO bit for DCDC1/2 to initiate voltage transistion */
120	switch (rid) {
121	case TPS65218_DCDC_1:
122	case TPS65218_DCDC_2:
123		ret = tps65218_set_bits(tps, TPS65218_REG_CONTRL_SLEW_RATE,
124					TPS65218_SLEW_RATE_GO,
125					TPS65218_SLEW_RATE_GO,
126					TPS65218_PROTECT_L1);
127		break;
128	}
129
130	return ret;
131}
132
133static int tps65218_pmic_enable(struct regulator_dev *dev)
134{
135	struct tps65218 *tps = rdev_get_drvdata(dev);
136	int rid = rdev_get_id(dev);
137
138	if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
139		return -EINVAL;
140
141	/* Enable the regulator and password protection is level 1 */
142	return tps65218_set_bits(tps, dev->desc->enable_reg,
143				 dev->desc->enable_mask, dev->desc->enable_mask,
144				 TPS65218_PROTECT_L1);
145}
146
147static int tps65218_pmic_disable(struct regulator_dev *dev)
148{
149	struct tps65218 *tps = rdev_get_drvdata(dev);
150	int rid = rdev_get_id(dev);
151
152	if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
153		return -EINVAL;
154
155	/* Disable the regulator and password protection is level 1 */
156	return tps65218_clear_bits(tps, dev->desc->enable_reg,
157				   dev->desc->enable_mask, TPS65218_PROTECT_L1);
158}
159
160/* Operations permitted on DCDC1, DCDC2 */
161static struct regulator_ops tps65218_dcdc12_ops = {
162	.is_enabled		= regulator_is_enabled_regmap,
163	.enable			= tps65218_pmic_enable,
164	.disable		= tps65218_pmic_disable,
165	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
166	.set_voltage_sel	= tps65218_pmic_set_voltage_sel,
167	.list_voltage		= regulator_list_voltage_linear_range,
168	.map_voltage		= regulator_map_voltage_linear_range,
169	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
170};
171
172/* Operations permitted on DCDC3, DCDC4 and LDO1 */
173static struct regulator_ops tps65218_ldo1_dcdc34_ops = {
174	.is_enabled		= regulator_is_enabled_regmap,
175	.enable			= tps65218_pmic_enable,
176	.disable		= tps65218_pmic_disable,
177	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
178	.set_voltage_sel	= tps65218_pmic_set_voltage_sel,
179	.list_voltage		= regulator_list_voltage_linear_range,
180	.map_voltage		= regulator_map_voltage_linear_range,
181};
182
183static const int ls3_currents[] = { 100, 200, 500, 1000 };
184
185static int tps65218_pmic_set_input_current_lim(struct regulator_dev *dev,
186					       int lim_uA)
187{
188	unsigned int index = 0;
189	unsigned int num_currents = ARRAY_SIZE(ls3_currents);
190	struct tps65218 *tps = rdev_get_drvdata(dev);
191
192	while (index < num_currents && ls3_currents[index] != lim_uA)
193		index++;
194
195	if (index == num_currents)
196		return -EINVAL;
197
198	return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
199				 index << 2, TPS65218_PROTECT_L1);
200}
201
202static int tps65218_pmic_set_current_limit(struct regulator_dev *dev,
203					   int min_uA, int max_uA)
204{
205	int index = 0;
206	unsigned int num_currents = ARRAY_SIZE(ls3_currents);
207	struct tps65218 *tps = rdev_get_drvdata(dev);
208
209	while (index < num_currents && ls3_currents[index] < max_uA)
210		index++;
211
212	index--;
213
214	if (index < 0 || ls3_currents[index] < min_uA)
215		return -EINVAL;
216
217	return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
218				 index << 2, TPS65218_PROTECT_L1);
219}
220
221static int tps65218_pmic_get_current_limit(struct regulator_dev *dev)
222{
223	int retval;
224	unsigned int index;
225	struct tps65218 *tps = rdev_get_drvdata(dev);
226
227	retval = tps65218_reg_read(tps, dev->desc->csel_reg, &index);
228	if (retval < 0)
229		return retval;
230
231	index = (index & dev->desc->csel_mask) >> 2;
232
233	return ls3_currents[index];
234}
235
236static struct regulator_ops tps65218_ls3_ops = {
237	.is_enabled		= regulator_is_enabled_regmap,
238	.enable			= tps65218_pmic_enable,
239	.disable		= tps65218_pmic_disable,
240	.set_input_current_limit = tps65218_pmic_set_input_current_lim,
241	.set_current_limit	= tps65218_pmic_set_current_limit,
242	.get_current_limit	= tps65218_pmic_get_current_limit,
243};
244
245/* Operations permitted on DCDC5, DCDC6 */
246static struct regulator_ops tps65218_dcdc56_pmic_ops = {
247	.is_enabled		= regulator_is_enabled_regmap,
248	.enable			= tps65218_pmic_enable,
249	.disable		= tps65218_pmic_disable,
250};
251
252static const struct regulator_desc regulators[] = {
253	TPS65218_REGULATOR("DCDC1", TPS65218_DCDC_1, REGULATOR_VOLTAGE,
254			   tps65218_dcdc12_ops, 64, TPS65218_REG_CONTROL_DCDC1,
255			   TPS65218_CONTROL_DCDC1_MASK, TPS65218_REG_ENABLE1,
256			   TPS65218_ENABLE1_DC1_EN, 0, 0, dcdc1_dcdc2_ranges,
257			   2, 4000, 0),
258	TPS65218_REGULATOR("DCDC2", TPS65218_DCDC_2, REGULATOR_VOLTAGE,
259			   tps65218_dcdc12_ops, 64, TPS65218_REG_CONTROL_DCDC2,
260			   TPS65218_CONTROL_DCDC2_MASK, TPS65218_REG_ENABLE1,
261			   TPS65218_ENABLE1_DC2_EN, 0, 0, dcdc1_dcdc2_ranges,
262			   2, 4000, 0),
263	TPS65218_REGULATOR("DCDC3", TPS65218_DCDC_3, REGULATOR_VOLTAGE,
264			   tps65218_ldo1_dcdc34_ops, 64,
265			   TPS65218_REG_CONTROL_DCDC3,
266			   TPS65218_CONTROL_DCDC3_MASK, TPS65218_REG_ENABLE1,
267			   TPS65218_ENABLE1_DC3_EN, 0, 0, ldo1_dcdc3_ranges, 2,
268			   0, 0),
269	TPS65218_REGULATOR("DCDC4", TPS65218_DCDC_4, REGULATOR_VOLTAGE,
270			   tps65218_ldo1_dcdc34_ops, 53,
271			   TPS65218_REG_CONTROL_DCDC4,
272			   TPS65218_CONTROL_DCDC4_MASK, TPS65218_REG_ENABLE1,
273			   TPS65218_ENABLE1_DC4_EN, 0, 0, dcdc4_ranges, 2,
274			   0, 0),
275	TPS65218_REGULATOR("DCDC5", TPS65218_DCDC_5, REGULATOR_VOLTAGE,
276			   tps65218_dcdc56_pmic_ops, 1, -1, -1,
277			   TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC5_EN, 0, 0,
278			   NULL, 0, 0, 1000000),
279	TPS65218_REGULATOR("DCDC6", TPS65218_DCDC_6, REGULATOR_VOLTAGE,
280			   tps65218_dcdc56_pmic_ops, 1, -1, -1,
281			   TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC6_EN, 0, 0,
282			   NULL, 0, 0, 1800000),
283	TPS65218_REGULATOR("LDO1", TPS65218_LDO_1, REGULATOR_VOLTAGE,
284			   tps65218_ldo1_dcdc34_ops, 64,
285			   TPS65218_REG_CONTROL_LDO1,
286			   TPS65218_CONTROL_LDO1_MASK, TPS65218_REG_ENABLE2,
287			   TPS65218_ENABLE2_LDO1_EN, 0, 0, ldo1_dcdc3_ranges,
288			   2, 0, 0),
289	TPS65218_REGULATOR("LS3", TPS65218_LS_3, REGULATOR_CURRENT,
290			   tps65218_ls3_ops, 0, 0, 0, TPS65218_REG_ENABLE2,
291			   TPS65218_ENABLE2_LS3_EN, TPS65218_REG_CONFIG2,
292			   TPS65218_CONFIG2_LS3ILIM_MASK, NULL, 0, 0, 0),
293};
294
295static int tps65218_regulator_probe(struct platform_device *pdev)
296{
297	struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
298	struct regulator_init_data *init_data;
299	const struct tps_info	*template;
300	struct regulator_dev *rdev;
301	const struct of_device_id	*match;
302	struct regulator_config config = { };
303	int id;
304
305	match = of_match_device(tps65218_of_match, &pdev->dev);
306	if (!match)
307		return -ENODEV;
308
309	template = match->data;
310	id = template->id;
311	init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
312					       &regulators[id]);
313
314	platform_set_drvdata(pdev, tps);
315
316	tps->info[id] = &tps65218_pmic_regs[id];
317	config.dev = &pdev->dev;
318	config.init_data = init_data;
319	config.driver_data = tps;
320	config.regmap = tps->regmap;
321	config.of_node = pdev->dev.of_node;
322
323	rdev = devm_regulator_register(&pdev->dev, &regulators[id], &config);
324	if (IS_ERR(rdev)) {
325		dev_err(tps->dev, "failed to register %s regulator\n",
326			pdev->name);
327		return PTR_ERR(rdev);
328	}
329
330	return 0;
331}
332
333static struct platform_driver tps65218_regulator_driver = {
334	.driver = {
335		.name = "tps65218-pmic",
336		.of_match_table = tps65218_of_match,
337	},
338	.probe = tps65218_regulator_probe,
339};
340
341module_platform_driver(tps65218_regulator_driver);
342
343MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
344MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
345MODULE_ALIAS("platform:tps65218-pmic");
346MODULE_LICENSE("GPL v2");