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, _ops, _n, _vr, _vm, _em, _t, _lr, _nlr) \
31 	{						\
32 		.name		= _name,		\
33 		.id		= _id,			\
34 		.ops		= &_ops,		\
35 		.n_voltages	= _n,			\
36 		.type		= REGULATOR_VOLTAGE,	\
37 		.owner		= THIS_MODULE,		\
38 		.vsel_reg	= _vr,			\
39 		.vsel_mask	= _vm,			\
40 		.enable_reg	= TPS65217_REG_ENABLE,	\
41 		.enable_mask	= _em,			\
42 		.volt_table	= _t,			\
43 		.linear_ranges	= _lr,			\
44 		.n_linear_ranges = _nlr,		\
45 	}						\
46 
47 static const unsigned int LDO1_VSEL_table[] = {
48 	1000000, 1100000, 1200000, 1250000,
49 	1300000, 1350000, 1400000, 1500000,
50 	1600000, 1800000, 2500000, 2750000,
51 	2800000, 3000000, 3100000, 3300000,
52 };
53 
54 static const struct regulator_linear_range tps65217_uv1_ranges[] = {
55 	REGULATOR_LINEAR_RANGE(900000, 0, 24, 25000),
56 	REGULATOR_LINEAR_RANGE(1550000, 25, 30, 50000),
57 	REGULATOR_LINEAR_RANGE(1850000, 31, 52, 50000),
58 	REGULATOR_LINEAR_RANGE(3000000, 53, 55, 100000),
59 	REGULATOR_LINEAR_RANGE(3300000, 56, 62, 0),
60 };
61 
62 static const struct regulator_linear_range tps65217_uv2_ranges[] = {
63 	REGULATOR_LINEAR_RANGE(1500000, 0, 8, 50000),
64 	REGULATOR_LINEAR_RANGE(2000000, 9, 13, 100000),
65 	REGULATOR_LINEAR_RANGE(2450000, 14, 31, 50000),
66 };
67 
68 static int tps65217_pmic_enable(struct regulator_dev *dev)
69 {
70 	struct tps65217 *tps = rdev_get_drvdata(dev);
71 	unsigned int rid = rdev_get_id(dev);
72 
73 	if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
74 		return -EINVAL;
75 
76 	/* Enable the regulator and password protection is level 1 */
77 	return tps65217_set_bits(tps, TPS65217_REG_ENABLE,
78 				 dev->desc->enable_mask, dev->desc->enable_mask,
79 				 TPS65217_PROTECT_L1);
80 }
81 
82 static int tps65217_pmic_disable(struct regulator_dev *dev)
83 {
84 	struct tps65217 *tps = rdev_get_drvdata(dev);
85 	unsigned int rid = rdev_get_id(dev);
86 
87 	if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
88 		return -EINVAL;
89 
90 	/* Disable the regulator and password protection is level 1 */
91 	return tps65217_clear_bits(tps, TPS65217_REG_ENABLE,
92 				   dev->desc->enable_mask, TPS65217_PROTECT_L1);
93 }
94 
95 static int tps65217_pmic_set_voltage_sel(struct regulator_dev *dev,
96 					 unsigned selector)
97 {
98 	int ret;
99 	struct tps65217 *tps = rdev_get_drvdata(dev);
100 	unsigned int rid = rdev_get_id(dev);
101 
102 	/* Set the voltage based on vsel value and write protect level is 2 */
103 	ret = tps65217_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
104 				selector, TPS65217_PROTECT_L2);
105 
106 	/* Set GO bit for DCDCx to initiate voltage transistion */
107 	switch (rid) {
108 	case TPS65217_DCDC_1 ... TPS65217_DCDC_3:
109 		ret = tps65217_set_bits(tps, TPS65217_REG_DEFSLEW,
110 				       TPS65217_DEFSLEW_GO, TPS65217_DEFSLEW_GO,
111 				       TPS65217_PROTECT_L2);
112 		break;
113 	}
114 
115 	return ret;
116 }
117 
118 /* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
119 static struct regulator_ops tps65217_pmic_ops = {
120 	.is_enabled		= regulator_is_enabled_regmap,
121 	.enable			= tps65217_pmic_enable,
122 	.disable		= tps65217_pmic_disable,
123 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
124 	.set_voltage_sel	= tps65217_pmic_set_voltage_sel,
125 	.list_voltage		= regulator_list_voltage_linear_range,
126 	.map_voltage		= regulator_map_voltage_linear_range,
127 };
128 
129 /* Operations permitted on LDO1 */
130 static struct regulator_ops tps65217_pmic_ldo1_ops = {
131 	.is_enabled		= regulator_is_enabled_regmap,
132 	.enable			= tps65217_pmic_enable,
133 	.disable		= tps65217_pmic_disable,
134 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
135 	.set_voltage_sel	= tps65217_pmic_set_voltage_sel,
136 	.list_voltage		= regulator_list_voltage_table,
137 	.map_voltage		= regulator_map_voltage_ascend,
138 };
139 
140 static const struct regulator_desc regulators[] = {
141 	TPS65217_REGULATOR("DCDC1", TPS65217_DCDC_1, tps65217_pmic_ops, 64,
142 			   TPS65217_REG_DEFDCDC1, TPS65217_DEFDCDCX_DCDC_MASK,
143 			   TPS65217_ENABLE_DC1_EN, NULL, tps65217_uv1_ranges,
144 			   2),	/* DCDC1 voltage range: 900000 ~ 1800000 */
145 	TPS65217_REGULATOR("DCDC2", TPS65217_DCDC_2, tps65217_pmic_ops, 64,
146 			   TPS65217_REG_DEFDCDC2, TPS65217_DEFDCDCX_DCDC_MASK,
147 			   TPS65217_ENABLE_DC2_EN, NULL, tps65217_uv1_ranges,
148 			   ARRAY_SIZE(tps65217_uv1_ranges)),
149 	TPS65217_REGULATOR("DCDC3", TPS65217_DCDC_3, tps65217_pmic_ops, 64,
150 			   TPS65217_REG_DEFDCDC3, TPS65217_DEFDCDCX_DCDC_MASK,
151 			   TPS65217_ENABLE_DC3_EN, NULL, tps65217_uv1_ranges,
152 			   1),	/* DCDC3 voltage range: 900000 ~ 1500000 */
153 	TPS65217_REGULATOR("LDO1", TPS65217_LDO_1, tps65217_pmic_ldo1_ops, 16,
154 			   TPS65217_REG_DEFLDO1, TPS65217_DEFLDO1_LDO1_MASK,
155 			   TPS65217_ENABLE_LDO1_EN, LDO1_VSEL_table, NULL, 0),
156 	TPS65217_REGULATOR("LDO2", TPS65217_LDO_2, tps65217_pmic_ops, 64,
157 			   TPS65217_REG_DEFLDO2, TPS65217_DEFLDO2_LDO2_MASK,
158 			   TPS65217_ENABLE_LDO2_EN, NULL, tps65217_uv1_ranges,
159 			   ARRAY_SIZE(tps65217_uv1_ranges)),
160 	TPS65217_REGULATOR("LDO3", TPS65217_LDO_3, tps65217_pmic_ops, 32,
161 			   TPS65217_REG_DEFLS1, TPS65217_DEFLDO3_LDO3_MASK,
162 			   TPS65217_ENABLE_LS1_EN | TPS65217_DEFLDO3_LDO3_EN,
163 			   NULL, tps65217_uv2_ranges,
164 			   ARRAY_SIZE(tps65217_uv2_ranges)),
165 	TPS65217_REGULATOR("LDO4", TPS65217_LDO_4, tps65217_pmic_ops, 32,
166 			   TPS65217_REG_DEFLS2, TPS65217_DEFLDO4_LDO4_MASK,
167 			   TPS65217_ENABLE_LS2_EN | TPS65217_DEFLDO4_LDO4_EN,
168 			   NULL, tps65217_uv2_ranges,
169 			   ARRAY_SIZE(tps65217_uv2_ranges)),
170 };
171 
172 #ifdef CONFIG_OF
173 static struct of_regulator_match reg_matches[] = {
174 	{ .name = "dcdc1", .driver_data = (void *)TPS65217_DCDC_1 },
175 	{ .name = "dcdc2", .driver_data = (void *)TPS65217_DCDC_2 },
176 	{ .name = "dcdc3", .driver_data = (void *)TPS65217_DCDC_3 },
177 	{ .name = "ldo1", .driver_data = (void *)TPS65217_LDO_1 },
178 	{ .name = "ldo2", .driver_data = (void *)TPS65217_LDO_2 },
179 	{ .name = "ldo3", .driver_data = (void *)TPS65217_LDO_3 },
180 	{ .name = "ldo4", .driver_data = (void *)TPS65217_LDO_4 },
181 };
182 
183 static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
184 {
185 	struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
186 	struct device_node *node = tps->dev->of_node;
187 	struct tps65217_board *pdata;
188 	struct device_node *regs;
189 	int i, count;
190 
191 	regs = of_get_child_by_name(node, "regulators");
192 	if (!regs)
193 		return NULL;
194 
195 	count = of_regulator_match(&pdev->dev, regs, reg_matches,
196 				   TPS65217_NUM_REGULATOR);
197 	of_node_put(regs);
198 	if ((count < 0) || (count > TPS65217_NUM_REGULATOR))
199 		return NULL;
200 
201 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
202 	if (!pdata)
203 		return NULL;
204 
205 	for (i = 0; i < count; i++) {
206 		if (!reg_matches[i].of_node)
207 			continue;
208 
209 		pdata->tps65217_init_data[i] = reg_matches[i].init_data;
210 		pdata->of_node[i] = reg_matches[i].of_node;
211 	}
212 
213 	return pdata;
214 }
215 #else
216 static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
217 {
218 	return NULL;
219 }
220 #endif
221 
222 static int tps65217_regulator_probe(struct platform_device *pdev)
223 {
224 	struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
225 	struct tps65217_board *pdata = dev_get_platdata(tps->dev);
226 	struct regulator_dev *rdev;
227 	struct regulator_config config = { };
228 	int i;
229 
230 	if (tps->dev->of_node)
231 		pdata = tps65217_parse_dt(pdev);
232 
233 	if (!pdata) {
234 		dev_err(&pdev->dev, "Platform data not found\n");
235 		return -EINVAL;
236 	}
237 
238 	if (tps65217_chip_id(tps) != TPS65217) {
239 		dev_err(&pdev->dev, "Invalid tps chip version\n");
240 		return -ENODEV;
241 	}
242 
243 	platform_set_drvdata(pdev, tps);
244 
245 	for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
246 		/* Register the regulators */
247 		config.dev = tps->dev;
248 		config.init_data = pdata->tps65217_init_data[i];
249 		config.driver_data = tps;
250 		config.regmap = tps->regmap;
251 		if (tps->dev->of_node)
252 			config.of_node = pdata->of_node[i];
253 
254 		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
255 					       &config);
256 		if (IS_ERR(rdev)) {
257 			dev_err(tps->dev, "failed to register %s regulator\n",
258 				pdev->name);
259 			return PTR_ERR(rdev);
260 		}
261 	}
262 	return 0;
263 }
264 
265 static struct platform_driver tps65217_regulator_driver = {
266 	.driver = {
267 		.name = "tps65217-pmic",
268 	},
269 	.probe = tps65217_regulator_probe,
270 };
271 
272 static int __init tps65217_regulator_init(void)
273 {
274 	return platform_driver_register(&tps65217_regulator_driver);
275 }
276 subsys_initcall(tps65217_regulator_init);
277 
278 static void __exit tps65217_regulator_exit(void)
279 {
280 	platform_driver_unregister(&tps65217_regulator_driver);
281 }
282 module_exit(tps65217_regulator_exit);
283 
284 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
285 MODULE_DESCRIPTION("TPS65217 voltage regulator driver");
286 MODULE_ALIAS("platform:tps65217-pmic");
287 MODULE_LICENSE("GPL v2");
288