1/*
  2 * tps65217-regulator.c
  3 *
  4 * Regulator driver for TPS65217 PMIC
  5 *
  6 * Copyright (C) 2011 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 as
 10 * published by the Free Software Foundation version 2.
 11 *
 12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 13 * kind, whether express or implied; without even the implied warranty
 14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15 * GNU General Public License 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
 25#include <linux/regulator/of_regulator.h>
 26#include <linux/regulator/driver.h>
 27#include <linux/regulator/machine.h>
 28#include <linux/mfd/tps65217.h>
 29
 30#define TPS65217_REGULATOR(_name, _id, _of_match, _ops, _n, _vr, _vm, _em, \
 31			   _t, _lr, _nlr,  _sr, _sm)	\
 32	{						\
 33		.name		= _name,		\
 34		.id		= _id,			\
 35		.of_match       = of_match_ptr(_of_match),    \
 36		.regulators_node= of_match_ptr("regulators"), \
 37		.ops		= &_ops,		\
 38		.n_voltages	= _n,			\
 39		.type		= REGULATOR_VOLTAGE,	\
 40		.owner		= THIS_MODULE,		\
 41		.vsel_reg	= _vr,			\
 42		.vsel_mask	= _vm,			\
 43		.enable_reg	= TPS65217_REG_ENABLE,	\
 44		.enable_mask	= _em,			\
 45		.volt_table	= _t,			\
 46		.linear_ranges	= _lr,			\
 47		.n_linear_ranges = _nlr,		\
 48		.bypass_reg	= _sr,			\
 49		.bypass_mask	= _sm,			\
 50	}						\
 51
 52static const unsigned int LDO1_VSEL_table[] = {
 53	1000000, 1100000, 1200000, 1250000,
 54	1300000, 1350000, 1400000, 1500000,
 55	1600000, 1800000, 2500000, 2750000,
 56	2800000, 3000000, 3100000, 3300000,
 57};
 58
 59static const struct regulator_linear_range tps65217_uv1_ranges[] = {
 60	REGULATOR_LINEAR_RANGE(900000, 0, 24, 25000),
 61	REGULATOR_LINEAR_RANGE(1550000, 25, 30, 50000),
 62	REGULATOR_LINEAR_RANGE(1850000, 31, 52, 50000),
 63	REGULATOR_LINEAR_RANGE(3000000, 53, 55, 100000),
 64	REGULATOR_LINEAR_RANGE(3300000, 56, 62, 0),
 65};
 66
 67static const struct regulator_linear_range tps65217_uv2_ranges[] = {
 68	REGULATOR_LINEAR_RANGE(1500000, 0, 8, 50000),
 69	REGULATOR_LINEAR_RANGE(2000000, 9, 13, 100000),
 70	REGULATOR_LINEAR_RANGE(2450000, 14, 31, 50000),
 71};
 72
 73static int tps65217_pmic_enable(struct regulator_dev *dev)
 74{
 75	struct tps65217 *tps = rdev_get_drvdata(dev);
 76	int rid = rdev_get_id(dev);
 77
 78	if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 79		return -EINVAL;
 80
 81	/* Enable the regulator and password protection is level 1 */
 82	return tps65217_set_bits(tps, TPS65217_REG_ENABLE,
 83				 dev->desc->enable_mask, dev->desc->enable_mask,
 84				 TPS65217_PROTECT_L1);
 85}
 86
 87static int tps65217_pmic_disable(struct regulator_dev *dev)
 88{
 89	struct tps65217 *tps = rdev_get_drvdata(dev);
 90	int rid = rdev_get_id(dev);
 91
 92	if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 93		return -EINVAL;
 94
 95	/* Disable the regulator and password protection is level 1 */
 96	return tps65217_clear_bits(tps, TPS65217_REG_ENABLE,
 97				   dev->desc->enable_mask, TPS65217_PROTECT_L1);
 98}
 99
100static int tps65217_pmic_set_voltage_sel(struct regulator_dev *dev,
101					 unsigned selector)
102{
103	int ret;
104	struct tps65217 *tps = rdev_get_drvdata(dev);
105	unsigned int rid = rdev_get_id(dev);
106
107	/* Set the voltage based on vsel value and write protect level is 2 */
108	ret = tps65217_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
109				selector, TPS65217_PROTECT_L2);
110
111	/* Set GO bit for DCDCx to initiate voltage transistion */
112	switch (rid) {
113	case TPS65217_DCDC_1 ... TPS65217_DCDC_3:
114		ret = tps65217_set_bits(tps, TPS65217_REG_DEFSLEW,
115				       TPS65217_DEFSLEW_GO, TPS65217_DEFSLEW_GO,
116				       TPS65217_PROTECT_L2);
117		break;
118	}
119
120	return ret;
121}
122
123static int tps65217_pmic_set_suspend_enable(struct regulator_dev *dev)
124{
125	struct tps65217 *tps = rdev_get_drvdata(dev);
126	unsigned int rid = rdev_get_id(dev);
127
128	if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
129		return -EINVAL;
130
131	return tps65217_clear_bits(tps, dev->desc->bypass_reg,
132				   dev->desc->bypass_mask,
133				   TPS65217_PROTECT_L1);
134}
135
136static int tps65217_pmic_set_suspend_disable(struct regulator_dev *dev)
137{
138	struct tps65217 *tps = rdev_get_drvdata(dev);
139	unsigned int rid = rdev_get_id(dev);
140
141	if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
142		return -EINVAL;
143
144	if (!tps->strobes[rid])
145		return -EINVAL;
146
147	return tps65217_set_bits(tps, dev->desc->bypass_reg,
148				 dev->desc->bypass_mask,
149				 tps->strobes[rid], TPS65217_PROTECT_L1);
150}
151
152/* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
153static struct regulator_ops tps65217_pmic_ops = {
154	.is_enabled		= regulator_is_enabled_regmap,
155	.enable			= tps65217_pmic_enable,
156	.disable		= tps65217_pmic_disable,
157	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
158	.set_voltage_sel	= tps65217_pmic_set_voltage_sel,
159	.list_voltage		= regulator_list_voltage_linear_range,
160	.map_voltage		= regulator_map_voltage_linear_range,
161	.set_suspend_enable	= tps65217_pmic_set_suspend_enable,
162	.set_suspend_disable	= tps65217_pmic_set_suspend_disable,
163};
164
165/* Operations permitted on LDO1 */
166static struct regulator_ops tps65217_pmic_ldo1_ops = {
167	.is_enabled		= regulator_is_enabled_regmap,
168	.enable			= tps65217_pmic_enable,
169	.disable		= tps65217_pmic_disable,
170	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
171	.set_voltage_sel	= tps65217_pmic_set_voltage_sel,
172	.list_voltage		= regulator_list_voltage_table,
173	.map_voltage		= regulator_map_voltage_ascend,
174	.set_suspend_enable	= tps65217_pmic_set_suspend_enable,
175	.set_suspend_disable	= tps65217_pmic_set_suspend_disable,
176};
177
178static const struct regulator_desc regulators[] = {
179	TPS65217_REGULATOR("DCDC1", TPS65217_DCDC_1, "dcdc1",
180			   tps65217_pmic_ops, 64, TPS65217_REG_DEFDCDC1,
181			   TPS65217_DEFDCDCX_DCDC_MASK, TPS65217_ENABLE_DC1_EN,
182			   NULL, tps65217_uv1_ranges, 2, TPS65217_REG_SEQ1,
183			   TPS65217_SEQ1_DC1_SEQ_MASK),
184	TPS65217_REGULATOR("DCDC2", TPS65217_DCDC_2, "dcdc2",
185			   tps65217_pmic_ops, 64, TPS65217_REG_DEFDCDC2,
186			   TPS65217_DEFDCDCX_DCDC_MASK, TPS65217_ENABLE_DC2_EN,
187			   NULL, tps65217_uv1_ranges,
188			   ARRAY_SIZE(tps65217_uv1_ranges), TPS65217_REG_SEQ1,
189			   TPS65217_SEQ1_DC2_SEQ_MASK),
190	TPS65217_REGULATOR("DCDC3", TPS65217_DCDC_3, "dcdc3",
191			   tps65217_pmic_ops, 64, TPS65217_REG_DEFDCDC3,
192			   TPS65217_DEFDCDCX_DCDC_MASK, TPS65217_ENABLE_DC3_EN,
193			   NULL, tps65217_uv1_ranges, 1, TPS65217_REG_SEQ2,
194			   TPS65217_SEQ2_DC3_SEQ_MASK),
195	TPS65217_REGULATOR("LDO1", TPS65217_LDO_1, "ldo1",
196			   tps65217_pmic_ldo1_ops, 16, TPS65217_REG_DEFLDO1,
197			   TPS65217_DEFLDO1_LDO1_MASK, TPS65217_ENABLE_LDO1_EN,
198			   LDO1_VSEL_table, NULL, 0, TPS65217_REG_SEQ2,
199			   TPS65217_SEQ2_LDO1_SEQ_MASK),
200	TPS65217_REGULATOR("LDO2", TPS65217_LDO_2, "ldo2", tps65217_pmic_ops,
201			   64, TPS65217_REG_DEFLDO2,
202			   TPS65217_DEFLDO2_LDO2_MASK, TPS65217_ENABLE_LDO2_EN,
203			   NULL, tps65217_uv1_ranges,
204			   ARRAY_SIZE(tps65217_uv1_ranges), TPS65217_REG_SEQ3,
205			   TPS65217_SEQ3_LDO2_SEQ_MASK),
206	TPS65217_REGULATOR("LDO3", TPS65217_LDO_3, "ldo3", tps65217_pmic_ops,
207			   32, TPS65217_REG_DEFLS1, TPS65217_DEFLDO3_LDO3_MASK,
208			   TPS65217_ENABLE_LS1_EN | TPS65217_DEFLDO3_LDO3_EN,
209			   NULL, tps65217_uv2_ranges,
210			   ARRAY_SIZE(tps65217_uv2_ranges), TPS65217_REG_SEQ3,
211			   TPS65217_SEQ3_LDO3_SEQ_MASK),
212	TPS65217_REGULATOR("LDO4", TPS65217_LDO_4, "ldo4", tps65217_pmic_ops,
213			   32, TPS65217_REG_DEFLS2, TPS65217_DEFLDO4_LDO4_MASK,
214			   TPS65217_ENABLE_LS2_EN | TPS65217_DEFLDO4_LDO4_EN,
215			   NULL, tps65217_uv2_ranges,
216			   ARRAY_SIZE(tps65217_uv2_ranges), TPS65217_REG_SEQ4,
217			   TPS65217_SEQ4_LDO4_SEQ_MASK),
218};
219
220static int tps65217_regulator_probe(struct platform_device *pdev)
221{
222	struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
223	struct tps65217_board *pdata = dev_get_platdata(tps->dev);
224	struct regulator_dev *rdev;
225	struct regulator_config config = { };
226	int i, ret;
227	unsigned int val;
228
229	if (tps65217_chip_id(tps) != TPS65217) {
230		dev_err(&pdev->dev, "Invalid tps chip version\n");
231		return -ENODEV;
232	}
233
234	/* Allocate memory for strobes */
235	tps->strobes = devm_kzalloc(&pdev->dev, sizeof(u8) *
236				    TPS65217_NUM_REGULATOR, GFP_KERNEL);
237
238	platform_set_drvdata(pdev, tps);
239
240	for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
241		/* Register the regulators */
242		config.dev = tps->dev;
243		if (pdata)
244			config.init_data = pdata->tps65217_init_data[i];
245		config.driver_data = tps;
246		config.regmap = tps->regmap;
247
248		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
249					       &config);
250		if (IS_ERR(rdev)) {
251			dev_err(tps->dev, "failed to register %s regulator\n",
252				pdev->name);
253			return PTR_ERR(rdev);
254		}
255
256		/* Store default strobe info */
257		ret = tps65217_reg_read(tps, regulators[i].bypass_reg, &val);
258		tps->strobes[i] = val & regulators[i].bypass_mask;
259	}
260
261	return 0;
262}
263
264static struct platform_driver tps65217_regulator_driver = {
265	.driver = {
266		.name = "tps65217-pmic",
267	},
268	.probe = tps65217_regulator_probe,
269};
270
271static int __init tps65217_regulator_init(void)
272{
273	return platform_driver_register(&tps65217_regulator_driver);
274}
275subsys_initcall(tps65217_regulator_init);
276
277static void __exit tps65217_regulator_exit(void)
278{
279	platform_driver_unregister(&tps65217_regulator_driver);
280}
281module_exit(tps65217_regulator_exit);
282
283MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
284MODULE_DESCRIPTION("TPS65217 voltage regulator driver");
285MODULE_ALIAS("platform:tps65217-pmic");
286MODULE_LICENSE("GPL v2");