1 /*
2  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
3  *
4  * Author: Andrew F. Davis <afd@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  * Based on the TPS65912 driver
16  */
17 
18 #include <linux/module.h>
19 #include <linux/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 
23 #include <linux/mfd/tps65086.h>
24 
25 enum tps65086_regulators { BUCK1, BUCK2, BUCK3, BUCK4, BUCK5, BUCK6, LDOA1,
26 	LDOA2, LDOA3, SWA1, SWB1, SWB2, VTT };
27 
28 #define TPS65086_REGULATOR(_name, _of, _id, _nv, _vr, _vm, _er, _em, _lr, _dr, _dm)	\
29 	[_id] = {							\
30 		.desc = {						\
31 			.name			= _name,		\
32 			.of_match		= of_match_ptr(_of),	\
33 			.regulators_node	= "regulators",		\
34 			.of_parse_cb		= tps65086_of_parse_cb,	\
35 			.id			= _id,			\
36 			.ops			= &reg_ops,		\
37 			.n_voltages		= _nv,			\
38 			.type			= REGULATOR_VOLTAGE,	\
39 			.owner			= THIS_MODULE,		\
40 			.vsel_reg		= _vr,			\
41 			.vsel_mask		= _vm,			\
42 			.enable_reg		= _er,			\
43 			.enable_mask		= _em,			\
44 			.volt_table		= NULL,			\
45 			.linear_ranges		= _lr,			\
46 			.n_linear_ranges	= ARRAY_SIZE(_lr),	\
47 		},							\
48 		.decay_reg = _dr,					\
49 		.decay_mask = _dm,					\
50 	}
51 
52 #define TPS65086_SWITCH(_name, _of, _id, _er, _em)			\
53 	[_id] = {							\
54 		.desc = {						\
55 			.name			= _name,		\
56 			.of_match		= of_match_ptr(_of),	\
57 			.regulators_node	= "regulators",		\
58 			.of_parse_cb		= tps65086_of_parse_cb,	\
59 			.id			= _id,			\
60 			.ops			= &switch_ops,		\
61 			.type			= REGULATOR_VOLTAGE,	\
62 			.owner			= THIS_MODULE,		\
63 			.enable_reg		= _er,			\
64 			.enable_mask		= _em,			\
65 		},							\
66 	}
67 
68 struct tps65086_regulator {
69 	struct regulator_desc desc;
70 	unsigned int decay_reg;
71 	unsigned int decay_mask;
72 };
73 
74 static const struct regulator_linear_range tps65086_10mv_ranges[] = {
75 	REGULATOR_LINEAR_RANGE(0, 0x0, 0x0, 0),
76 	REGULATOR_LINEAR_RANGE(410000, 0x1, 0x7F, 10000),
77 };
78 
79 static const struct regulator_linear_range tps65086_buck126_25mv_ranges[] = {
80 	REGULATOR_LINEAR_RANGE(0, 0x0, 0x0, 0),
81 	REGULATOR_LINEAR_RANGE(1000000, 0x1, 0x18, 0),
82 	REGULATOR_LINEAR_RANGE(1025000, 0x19, 0x7F, 25000),
83 };
84 
85 static const struct regulator_linear_range tps65086_buck345_25mv_ranges[] = {
86 	REGULATOR_LINEAR_RANGE(0, 0x0, 0x0, 0),
87 	REGULATOR_LINEAR_RANGE(425000, 0x1, 0x7F, 25000),
88 };
89 
90 static const struct regulator_linear_range tps65086_ldoa1_ranges[] = {
91 	REGULATOR_LINEAR_RANGE(1350000, 0x0, 0x0, 0),
92 	REGULATOR_LINEAR_RANGE(1500000, 0x1, 0x7, 100000),
93 	REGULATOR_LINEAR_RANGE(2300000, 0x8, 0xB, 100000),
94 	REGULATOR_LINEAR_RANGE(2850000, 0xC, 0xD, 150000),
95 	REGULATOR_LINEAR_RANGE(3300000, 0xE, 0xE, 0),
96 };
97 
98 static const struct regulator_linear_range tps65086_ldoa23_ranges[] = {
99 	REGULATOR_LINEAR_RANGE(700000, 0x0, 0xD, 50000),
100 	REGULATOR_LINEAR_RANGE(1400000, 0xE, 0xF, 100000),
101 };
102 
103 /* Operations permitted on regulators */
104 static struct regulator_ops reg_ops = {
105 	.enable			= regulator_enable_regmap,
106 	.disable		= regulator_disable_regmap,
107 	.is_enabled		= regulator_is_enabled_regmap,
108 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
109 	.map_voltage		= regulator_map_voltage_linear_range,
110 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
111 	.list_voltage		= regulator_list_voltage_linear_range,
112 };
113 
114 /* Operations permitted on load switches */
115 static struct regulator_ops switch_ops = {
116 	.enable			= regulator_enable_regmap,
117 	.disable		= regulator_disable_regmap,
118 	.is_enabled		= regulator_is_enabled_regmap,
119 };
120 
121 static int tps65086_of_parse_cb(struct device_node *dev,
122 				const struct regulator_desc *desc,
123 				struct regulator_config *config);
124 
125 static struct tps65086_regulator regulators[] = {
126 	TPS65086_REGULATOR("BUCK1", "buck1", BUCK1, 0x80, TPS65086_BUCK1CTRL,
127 			   BUCK_VID_MASK, TPS65086_BUCK123CTRL, BIT(0),
128 			   tps65086_10mv_ranges, TPS65086_BUCK1CTRL,
129 			   BIT(0)),
130 	TPS65086_REGULATOR("BUCK2", "buck2", BUCK2, 0x80, TPS65086_BUCK2CTRL,
131 			   BUCK_VID_MASK, TPS65086_BUCK123CTRL, BIT(1),
132 			   tps65086_10mv_ranges, TPS65086_BUCK2CTRL,
133 			   BIT(0)),
134 	TPS65086_REGULATOR("BUCK3", "buck3", BUCK3, 0x80, TPS65086_BUCK3VID,
135 			   BUCK_VID_MASK, TPS65086_BUCK123CTRL, BIT(2),
136 			   tps65086_10mv_ranges, TPS65086_BUCK3DECAY,
137 			   BIT(0)),
138 	TPS65086_REGULATOR("BUCK4", "buck4", BUCK4, 0x80, TPS65086_BUCK4VID,
139 			   BUCK_VID_MASK, TPS65086_BUCK4CTRL, BIT(0),
140 			   tps65086_10mv_ranges, TPS65086_BUCK4VID,
141 			   BIT(0)),
142 	TPS65086_REGULATOR("BUCK5", "buck5", BUCK5, 0x80, TPS65086_BUCK5VID,
143 			   BUCK_VID_MASK, TPS65086_BUCK5CTRL, BIT(0),
144 			   tps65086_10mv_ranges, TPS65086_BUCK5CTRL,
145 			   BIT(0)),
146 	TPS65086_REGULATOR("BUCK6", "buck6", BUCK6, 0x80, TPS65086_BUCK6VID,
147 			   BUCK_VID_MASK, TPS65086_BUCK6CTRL, BIT(0),
148 			   tps65086_10mv_ranges, TPS65086_BUCK6CTRL,
149 			   BIT(0)),
150 	TPS65086_REGULATOR("LDOA1", "ldoa1", LDOA1, 0xF, TPS65086_LDOA1CTRL,
151 			   VDOA1_VID_MASK, TPS65086_LDOA1CTRL, BIT(0),
152 			   tps65086_ldoa1_ranges, 0, 0),
153 	TPS65086_REGULATOR("LDOA2", "ldoa2", LDOA2, 0x10, TPS65086_LDOA2VID,
154 			   VDOA23_VID_MASK, TPS65086_LDOA2CTRL, BIT(0),
155 			   tps65086_ldoa23_ranges, 0, 0),
156 	TPS65086_REGULATOR("LDOA3", "ldoa3", LDOA3, 0x10, TPS65086_LDOA3VID,
157 			   VDOA23_VID_MASK, TPS65086_LDOA3CTRL, BIT(0),
158 			   tps65086_ldoa23_ranges, 0, 0),
159 	TPS65086_SWITCH("SWA1", "swa1", SWA1, TPS65086_SWVTT_EN, BIT(5)),
160 	TPS65086_SWITCH("SWB1", "swb1", SWB1, TPS65086_SWVTT_EN, BIT(6)),
161 	TPS65086_SWITCH("SWB2", "swb2", SWB2, TPS65086_SWVTT_EN, BIT(7)),
162 	TPS65086_SWITCH("VTT", "vtt", VTT, TPS65086_SWVTT_EN, BIT(4)),
163 };
164 
165 static int tps65086_of_parse_cb(struct device_node *node,
166 				const struct regulator_desc *desc,
167 				struct regulator_config *config)
168 {
169 	int ret;
170 
171 	/* Check for 25mV step mode */
172 	if (of_property_read_bool(node, "ti,regulator-step-size-25mv")) {
173 		switch (desc->id) {
174 		case BUCK1:
175 		case BUCK2:
176 		case BUCK6:
177 			regulators[desc->id].desc.linear_ranges =
178 				tps65086_buck126_25mv_ranges;
179 			regulators[desc->id].desc.n_linear_ranges =
180 				ARRAY_SIZE(tps65086_buck126_25mv_ranges);
181 			break;
182 		case BUCK3:
183 		case BUCK4:
184 		case BUCK5:
185 			regulators[desc->id].desc.linear_ranges =
186 				tps65086_buck345_25mv_ranges;
187 			regulators[desc->id].desc.n_linear_ranges =
188 				ARRAY_SIZE(tps65086_buck345_25mv_ranges);
189 			break;
190 		default:
191 			dev_warn(config->dev, "25mV step mode only valid for BUCK regulators\n");
192 		}
193 	}
194 
195 	/* Check for decay mode */
196 	if (desc->id <= BUCK6 && of_property_read_bool(node, "ti,regulator-decay")) {
197 		ret = regmap_write_bits(config->regmap,
198 					regulators[desc->id].decay_reg,
199 					regulators[desc->id].decay_mask,
200 					regulators[desc->id].decay_mask);
201 		if (ret) {
202 			dev_err(config->dev, "Error setting decay\n");
203 			return ret;
204 		}
205 	}
206 
207 	return 0;
208 }
209 
210 static int tps65086_regulator_probe(struct platform_device *pdev)
211 {
212 	struct tps65086 *tps = dev_get_drvdata(pdev->dev.parent);
213 	struct regulator_config config = { };
214 	struct regulator_dev *rdev;
215 	int i;
216 
217 	platform_set_drvdata(pdev, tps);
218 
219 	config.dev = &pdev->dev;
220 	config.dev->of_node = tps->dev->of_node;
221 	config.driver_data = tps;
222 	config.regmap = tps->regmap;
223 
224 	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
225 		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
226 					       &config);
227 		if (IS_ERR(rdev)) {
228 			dev_err(tps->dev, "failed to register %s regulator\n",
229 				pdev->name);
230 			return PTR_ERR(rdev);
231 		}
232 	}
233 
234 	return 0;
235 }
236 
237 static const struct platform_device_id tps65086_regulator_id_table[] = {
238 	{ "tps65086-regulator", },
239 	{ /* sentinel */ }
240 };
241 MODULE_DEVICE_TABLE(platform, tps65086_regulator_id_table);
242 
243 static struct platform_driver tps65086_regulator_driver = {
244 	.driver = {
245 		.name = "tps65086-regulator",
246 	},
247 	.probe = tps65086_regulator_probe,
248 	.id_table = tps65086_regulator_id_table,
249 };
250 module_platform_driver(tps65086_regulator_driver);
251 
252 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
253 MODULE_DESCRIPTION("TPS65086 Regulator driver");
254 MODULE_LICENSE("GPL v2");
255