1 /*
2  * Regulator driver for LP87565 PMIC
3  *
4  * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
5  *
6  *  This program is free software; you can redistribute  it and/or modify it
7  *  under  the terms of  the GNU General  Public License as published by the
8  *  Free Software Foundation version 2.
9  */
10 
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14 
15 #include <linux/mfd/lp87565.h>
16 
17 #define LP87565_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
18 			 _delay, _lr, _cr)				\
19 	[_id] = {							\
20 		.desc = {						\
21 			.name			= _name,		\
22 			.supply_name		= _of "-in",		\
23 			.id			= _id,			\
24 			.of_match		= of_match_ptr(_of),	\
25 			.regulators_node	= of_match_ptr("regulators"),\
26 			.ops			= &_ops,		\
27 			.n_voltages		= _n,			\
28 			.type			= REGULATOR_VOLTAGE,	\
29 			.owner			= THIS_MODULE,		\
30 			.vsel_reg		= _vr,			\
31 			.vsel_mask		= _vm,			\
32 			.enable_reg		= _er,			\
33 			.enable_mask		= _em,			\
34 			.ramp_delay		= _delay,		\
35 			.linear_ranges		= _lr,			\
36 			.n_linear_ranges	= ARRAY_SIZE(_lr),	\
37 		},							\
38 		.ctrl2_reg = _cr,					\
39 	}
40 
41 struct lp87565_regulator {
42 	struct regulator_desc desc;
43 	unsigned int ctrl2_reg;
44 };
45 
46 static const struct lp87565_regulator regulators[];
47 
48 static const struct regulator_linear_range buck0_1_2_3_ranges[] = {
49 	REGULATOR_LINEAR_RANGE(600000, 0xA, 0x17, 10000),
50 	REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
51 	REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
52 };
53 
54 static unsigned int lp87565_buck_ramp_delay[] = {
55 	30000, 15000, 10000, 7500, 3800, 1900, 940, 470
56 };
57 
58 /* LP87565 BUCK current limit */
59 static const unsigned int lp87565_buck_uA[] = {
60 	1500000, 2000000, 2500000, 3000000, 3500000, 4000000, 4500000, 5000000,
61 };
62 
63 static int lp87565_buck_set_ramp_delay(struct regulator_dev *rdev,
64 				       int ramp_delay)
65 {
66 	int id = rdev_get_id(rdev);
67 	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
68 	unsigned int reg;
69 	int ret;
70 
71 	if (ramp_delay <= 470)
72 		reg = 7;
73 	else if (ramp_delay <= 940)
74 		reg = 6;
75 	else if (ramp_delay <= 1900)
76 		reg = 5;
77 	else if (ramp_delay <= 3800)
78 		reg = 4;
79 	else if (ramp_delay <= 7500)
80 		reg = 3;
81 	else if (ramp_delay <= 10000)
82 		reg = 2;
83 	else if (ramp_delay <= 15000)
84 		reg = 1;
85 	else
86 		reg = 0;
87 
88 	ret = regmap_update_bits(lp87565->regmap, regulators[id].ctrl2_reg,
89 				 LP87565_BUCK_CTRL_2_SLEW_RATE,
90 				 reg << __ffs(LP87565_BUCK_CTRL_2_SLEW_RATE));
91 	if (ret) {
92 		dev_err(lp87565->dev, "SLEW RATE write failed: %d\n", ret);
93 		return ret;
94 	}
95 
96 	rdev->constraints->ramp_delay = lp87565_buck_ramp_delay[reg];
97 
98 	/* Conservatively give a 15% margin */
99 	rdev->constraints->ramp_delay =
100 				rdev->constraints->ramp_delay * 85 / 100;
101 
102 	return 0;
103 }
104 
105 static int lp87565_buck_set_current_limit(struct regulator_dev *rdev,
106 					  int min_uA, int max_uA)
107 {
108 	int id = rdev_get_id(rdev);
109 	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
110 	int i;
111 
112 	for (i = ARRAY_SIZE(lp87565_buck_uA) - 1; i >= 0; i--) {
113 		if (lp87565_buck_uA[i] >= min_uA &&
114 		    lp87565_buck_uA[i] <= max_uA)
115 			return regmap_update_bits(lp87565->regmap,
116 						  regulators[id].ctrl2_reg,
117 						  LP87565_BUCK_CTRL_2_ILIM,
118 						  i << __ffs(LP87565_BUCK_CTRL_2_ILIM));
119 	}
120 
121 	return -EINVAL;
122 }
123 
124 static int lp87565_buck_get_current_limit(struct regulator_dev *rdev)
125 {
126 	int id = rdev_get_id(rdev);
127 	struct lp87565 *lp87565 = rdev_get_drvdata(rdev);
128 	int ret;
129 	unsigned int val;
130 
131 	ret = regmap_read(lp87565->regmap, regulators[id].ctrl2_reg, &val);
132 	if (ret)
133 		return ret;
134 
135 	val = (val & LP87565_BUCK_CTRL_2_ILIM) >>
136 	       __ffs(LP87565_BUCK_CTRL_2_ILIM);
137 
138 	return (val < ARRAY_SIZE(lp87565_buck_uA)) ?
139 			lp87565_buck_uA[val] : -EINVAL;
140 }
141 
142 /* Operations permitted on BUCK0, BUCK1 */
143 static struct regulator_ops lp87565_buck_ops = {
144 	.is_enabled		= regulator_is_enabled_regmap,
145 	.enable			= regulator_enable_regmap,
146 	.disable		= regulator_disable_regmap,
147 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
148 	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
149 	.list_voltage		= regulator_list_voltage_linear_range,
150 	.map_voltage		= regulator_map_voltage_linear_range,
151 	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
152 	.set_ramp_delay		= lp87565_buck_set_ramp_delay,
153 	.set_current_limit	= lp87565_buck_set_current_limit,
154 	.get_current_limit	= lp87565_buck_get_current_limit,
155 };
156 
157 static const struct lp87565_regulator regulators[] = {
158 	LP87565_REGULATOR("BUCK0", LP87565_BUCK_0, "buck0", lp87565_buck_ops,
159 			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
160 			  LP87565_REG_BUCK0_CTRL_1,
161 			  LP87565_BUCK_CTRL_1_EN, 3230,
162 			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
163 	LP87565_REGULATOR("BUCK1", LP87565_BUCK_1, "buck1", lp87565_buck_ops,
164 			  256, LP87565_REG_BUCK1_VOUT, LP87565_BUCK_VSET,
165 			  LP87565_REG_BUCK1_CTRL_1,
166 			  LP87565_BUCK_CTRL_1_EN, 3230,
167 			  buck0_1_2_3_ranges, LP87565_REG_BUCK1_CTRL_2),
168 	LP87565_REGULATOR("BUCK2", LP87565_BUCK_2, "buck2", lp87565_buck_ops,
169 			  256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
170 			  LP87565_REG_BUCK2_CTRL_1,
171 			  LP87565_BUCK_CTRL_1_EN, 3230,
172 			  buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
173 	LP87565_REGULATOR("BUCK3", LP87565_BUCK_3, "buck3", lp87565_buck_ops,
174 			  256, LP87565_REG_BUCK3_VOUT, LP87565_BUCK_VSET,
175 			  LP87565_REG_BUCK3_CTRL_1,
176 			  LP87565_BUCK_CTRL_1_EN, 3230,
177 			  buck0_1_2_3_ranges, LP87565_REG_BUCK3_CTRL_2),
178 	LP87565_REGULATOR("BUCK10", LP87565_BUCK_10, "buck10", lp87565_buck_ops,
179 			  256, LP87565_REG_BUCK0_VOUT, LP87565_BUCK_VSET,
180 			  LP87565_REG_BUCK0_CTRL_1,
181 			  LP87565_BUCK_CTRL_1_EN |
182 			  LP87565_BUCK_CTRL_1_FPWM_MP_0_2, 3230,
183 			  buck0_1_2_3_ranges, LP87565_REG_BUCK0_CTRL_2),
184 	LP87565_REGULATOR("BUCK23", LP87565_BUCK_23, "buck23", lp87565_buck_ops,
185 			  256, LP87565_REG_BUCK2_VOUT, LP87565_BUCK_VSET,
186 			  LP87565_REG_BUCK2_CTRL_1,
187 			  LP87565_BUCK_CTRL_1_EN, 3230,
188 			  buck0_1_2_3_ranges, LP87565_REG_BUCK2_CTRL_2),
189 };
190 
191 static int lp87565_regulator_probe(struct platform_device *pdev)
192 {
193 	struct lp87565 *lp87565 = dev_get_drvdata(pdev->dev.parent);
194 	struct regulator_config config = { };
195 	struct regulator_dev *rdev;
196 	int i, min_idx = LP87565_BUCK_1, max_idx = LP87565_BUCK_3;
197 
198 	platform_set_drvdata(pdev, lp87565);
199 
200 	config.dev = &pdev->dev;
201 	config.dev->of_node = lp87565->dev->of_node;
202 	config.driver_data = lp87565;
203 	config.regmap = lp87565->regmap;
204 
205 	if (lp87565->dev_type == LP87565_DEVICE_TYPE_LP87565_Q1) {
206 		min_idx = LP87565_BUCK_10;
207 		max_idx = LP87565_BUCK_23;
208 	}
209 
210 	for (i = min_idx; i <= max_idx; i++) {
211 		rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
212 					       &config);
213 		if (IS_ERR(rdev)) {
214 			dev_err(lp87565->dev, "failed to register %s regulator\n",
215 				pdev->name);
216 			return PTR_ERR(rdev);
217 		}
218 	}
219 
220 	return 0;
221 }
222 
223 static const struct platform_device_id lp87565_regulator_id_table[] = {
224 	{ "lp87565-regulator", },
225 	{ "lp87565-q1-regulator", },
226 	{ /* sentinel */ }
227 };
228 MODULE_DEVICE_TABLE(platform, lp87565_regulator_id_table);
229 
230 static struct platform_driver lp87565_regulator_driver = {
231 	.driver = {
232 		.name = "lp87565-pmic",
233 	},
234 	.probe = lp87565_regulator_probe,
235 	.id_table = lp87565_regulator_id_table,
236 };
237 module_platform_driver(lp87565_regulator_driver);
238 
239 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
240 MODULE_DESCRIPTION("LP87565 voltage regulator driver");
241 MODULE_LICENSE("GPL v2");
242