1/*
2 * Regulator driver for LP873X PMIC
3 *
4 * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether expressed or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License version 2 for more details.
14 */
15
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/regmap.h>
19
20#include <linux/mfd/lp873x.h>
21
22#define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
23			 _delay, _lr, _cr)				\
24	[_id] = {							\
25		.desc = {						\
26			.name			= _name,		\
27			.supply_name		= _of "-in",		\
28			.id			= _id,			\
29			.of_match		= of_match_ptr(_of),	\
30			.regulators_node	= of_match_ptr("regulators"),\
31			.ops			= &_ops,		\
32			.n_voltages		= _n,			\
33			.type			= REGULATOR_VOLTAGE,	\
34			.owner			= THIS_MODULE,		\
35			.vsel_reg		= _vr,			\
36			.vsel_mask		= _vm,			\
37			.enable_reg		= _er,			\
38			.enable_mask		= _em,			\
39			.ramp_delay		= _delay,		\
40			.linear_ranges		= _lr,			\
41			.n_linear_ranges	= ARRAY_SIZE(_lr),	\
42			.curr_table	= lp873x_buck_uA,		\
43			.n_current_limits = ARRAY_SIZE(lp873x_buck_uA),	\
44			.csel_reg	= (_cr),			\
45			.csel_mask	= LP873X_BUCK0_CTRL_2_BUCK0_ILIM,\
46		},							\
47		.ctrl2_reg = _cr,					\
48	}
49
50struct lp873x_regulator {
51	struct regulator_desc desc;
52	unsigned int ctrl2_reg;
53};
54
55static const struct lp873x_regulator regulators[];
56
57static const struct linear_range buck0_buck1_ranges[] = {
58	REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
59	REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
60	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
61	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
62};
63
64static const struct linear_range ldo0_ldo1_ranges[] = {
65	REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
66};
67
68static const unsigned int lp873x_buck_ramp_delay[] = {
69	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
70};
71
72/* LP873X BUCK current limit */
73static const unsigned int lp873x_buck_uA[] = {
74	1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
75};
76
77static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
78				      int ramp_delay)
79{
80	int id = rdev_get_id(rdev);
81	struct lp873x *lp873 = rdev_get_drvdata(rdev);
82	unsigned int reg;
83	int ret;
84
85	if (ramp_delay <= 470)
86		reg = 7;
87	else if (ramp_delay <= 940)
88		reg = 6;
89	else if (ramp_delay <= 1900)
90		reg = 5;
91	else if (ramp_delay <= 3800)
92		reg = 4;
93	else if (ramp_delay <= 7500)
94		reg = 3;
95	else if (ramp_delay <= 10000)
96		reg = 2;
97	else if (ramp_delay <= 15000)
98		reg = 1;
99	else
100		reg = 0;
101
102	ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
103				 LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
104				 reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
105	if (ret) {
106		dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
107		return ret;
108	}
109
110	rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
111
112	return 0;
113}
114
115/* Operations permitted on BUCK0, BUCK1 */
116static const struct regulator_ops lp873x_buck01_ops = {
117	.is_enabled		= regulator_is_enabled_regmap,
118	.enable			= regulator_enable_regmap,
119	.disable		= regulator_disable_regmap,
120	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
121	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
122	.list_voltage		= regulator_list_voltage_linear_range,
123	.map_voltage		= regulator_map_voltage_linear_range,
124	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
125	.set_ramp_delay		= lp873x_buck_set_ramp_delay,
126	.set_current_limit	= regulator_set_current_limit_regmap,
127	.get_current_limit	= regulator_get_current_limit_regmap,
128};
129
130/* Operations permitted on LDO0 and LDO1 */
131static const struct regulator_ops lp873x_ldo01_ops = {
132	.is_enabled		= regulator_is_enabled_regmap,
133	.enable			= regulator_enable_regmap,
134	.disable		= regulator_disable_regmap,
135	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
136	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
137	.list_voltage		= regulator_list_voltage_linear_range,
138	.map_voltage		= regulator_map_voltage_linear_range,
139};
140
141static const struct lp873x_regulator regulators[] = {
142	LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
143			 256, LP873X_REG_BUCK0_VOUT,
144			 LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
145			 LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
146			 buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
147	LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
148			 256, LP873X_REG_BUCK1_VOUT,
149			 LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
150			 LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
151			 buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
152	LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
153			 LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
154			 LP873X_REG_LDO0_CTRL,
155			 LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
156	LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
157			 LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
158			 LP873X_REG_LDO1_CTRL,
159			 LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
160};
161
162static int lp873x_regulator_probe(struct platform_device *pdev)
163{
164	struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
165	struct regulator_config config = { };
166	struct regulator_dev *rdev;
167	int i;
168
169	platform_set_drvdata(pdev, lp873);
170
171	config.dev = &pdev->dev;
172	config.dev->of_node = lp873->dev->of_node;
173	config.driver_data = lp873;
174	config.regmap = lp873->regmap;
175
176	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
177		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
178					       &config);
179		if (IS_ERR(rdev)) {
180			dev_err(lp873->dev, "failed to register %s regulator\n",
181				pdev->name);
182			return PTR_ERR(rdev);
183		}
184	}
185
186	return 0;
187}
188
189static const struct platform_device_id lp873x_regulator_id_table[] = {
190	{ "lp873x-regulator", },
191	{ /* sentinel */ }
192};
193MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
194
195static struct platform_driver lp873x_regulator_driver = {
196	.driver = {
197		.name = "lp873x-pmic",
198	},
199	.probe = lp873x_regulator_probe,
200	.id_table = lp873x_regulator_id_table,
201};
202module_platform_driver(lp873x_regulator_driver);
203
204MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
205MODULE_DESCRIPTION("LP873X voltage regulator driver");
206MODULE_ALIAS("platform:lp873x-pmic");
207MODULE_LICENSE("GPL v2");
208