1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Device driver for regulators in Hi6421V530 IC
4 //
5 // Copyright (c) <2017> HiSilicon Technologies Co., Ltd.
6 //              http://www.hisilicon.com
7 // Copyright (c) <2017> Linaro Ltd.
8 //              https://www.linaro.org
9 //
10 // Author: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
11 //         Guodong Xu <guodong.xu@linaro.org>
12 
13 #include <linux/mfd/hi6421-pmic.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/regmap.h>
18 #include <linux/regulator/driver.h>
19 
20 /*
21  * struct hi6421v530_regulator_info - hi6421v530 regulator information
22  * @desc: regulator description
23  * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
24  * @eco_microamp: eco mode load upper limit (in uA), valid for LDOs only
25  */
26 struct hi6421v530_regulator_info {
27 	struct regulator_desc rdesc;
28 	u8 mode_mask;
29 	u32 eco_microamp;
30 };
31 
32 /* HI6421v530 regulators */
33 enum hi6421v530_regulator_id {
34 	HI6421V530_LDO3,
35 	HI6421V530_LDO9,
36 	HI6421V530_LDO11,
37 	HI6421V530_LDO15,
38 	HI6421V530_LDO16,
39 };
40 
41 static const unsigned int ldo_3_voltages[] = {
42 	1800000, 1825000, 1850000, 1875000,
43 	1900000, 1925000, 1950000, 1975000,
44 	2000000, 2025000, 2050000, 2075000,
45 	2100000, 2125000, 2150000, 2200000,
46 };
47 
48 static const unsigned int ldo_9_11_voltages[] = {
49 	1750000, 1800000, 1825000, 2800000,
50 	2850000, 2950000, 3000000, 3300000,
51 };
52 
53 static const unsigned int ldo_15_16_voltages[] = {
54 	1750000, 1800000, 2400000, 2600000,
55 	2700000, 2850000, 2950000, 3000000,
56 };
57 
58 static const struct regulator_ops hi6421v530_ldo_ops;
59 
60 #define HI6421V530_LDO_ENABLE_TIME (350)
61 
62 /*
63  * _id - LDO id name string
64  * v_table - voltage table
65  * vreg - voltage select register
66  * vmask - voltage select mask
67  * ereg - enable register
68  * emask - enable mask
69  * odelay - off/on delay time in uS
70  * ecomask - eco mode mask
71  * ecoamp - eco mode load uppler limit in uA
72  */
73 #define HI6421V530_LDO(_ID, v_table, vreg, vmask, ereg, emask,		\
74 		   odelay, ecomask, ecoamp) {				\
75 	.rdesc = {							\
76 		.name		 = #_ID,				\
77 		.of_match        = of_match_ptr(#_ID),			\
78 		.regulators_node = of_match_ptr("regulators"),		\
79 		.ops		 = &hi6421v530_ldo_ops,			\
80 		.type		 = REGULATOR_VOLTAGE,			\
81 		.id		 = HI6421V530_##_ID,			\
82 		.owner		 = THIS_MODULE,				\
83 		.n_voltages	 = ARRAY_SIZE(v_table),			\
84 		.volt_table	 = v_table,				\
85 		.vsel_reg	 = HI6421_REG_TO_BUS_ADDR(vreg),	\
86 		.vsel_mask	 = vmask,				\
87 		.enable_reg	 = HI6421_REG_TO_BUS_ADDR(ereg),	\
88 		.enable_mask	 = emask,				\
89 		.enable_time	 = HI6421V530_LDO_ENABLE_TIME,		\
90 		.off_on_delay	 = odelay,				\
91 	},								\
92 	.mode_mask	= ecomask,					\
93 	.eco_microamp	= ecoamp,					\
94 }
95 
96 /* HI6421V530 regulator information */
97 
98 static struct hi6421v530_regulator_info hi6421v530_regulator_info[] = {
99 	HI6421V530_LDO(LDO3, ldo_3_voltages, 0x061, 0xf, 0x060, 0x2,
100 		   20000, 0x6, 8000),
101 	HI6421V530_LDO(LDO9, ldo_9_11_voltages, 0x06b, 0x7, 0x06a, 0x2,
102 		   40000, 0x6, 8000),
103 	HI6421V530_LDO(LDO11, ldo_9_11_voltages, 0x06f, 0x7, 0x06e, 0x2,
104 		   40000, 0x6, 8000),
105 	HI6421V530_LDO(LDO15, ldo_15_16_voltages, 0x077, 0x7, 0x076, 0x2,
106 		   40000, 0x6, 8000),
107 	HI6421V530_LDO(LDO16, ldo_15_16_voltages, 0x079, 0x7, 0x078, 0x2,
108 		   40000, 0x6, 8000),
109 };
110 
111 static unsigned int hi6421v530_regulator_ldo_get_mode(
112 					struct regulator_dev *rdev)
113 {
114 	struct hi6421v530_regulator_info *info;
115 	unsigned int reg_val;
116 
117 	info = rdev_get_drvdata(rdev);
118 	regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
119 
120 	if (reg_val & (info->mode_mask))
121 		return REGULATOR_MODE_IDLE;
122 
123 	return REGULATOR_MODE_NORMAL;
124 }
125 
126 static int hi6421v530_regulator_ldo_set_mode(struct regulator_dev *rdev,
127 						unsigned int mode)
128 {
129 	struct hi6421v530_regulator_info *info;
130 	unsigned int new_mode;
131 
132 	info = rdev_get_drvdata(rdev);
133 	switch (mode) {
134 	case REGULATOR_MODE_NORMAL:
135 		new_mode = 0;
136 		break;
137 	case REGULATOR_MODE_IDLE:
138 		new_mode = info->mode_mask;
139 		break;
140 	default:
141 		return -EINVAL;
142 	}
143 
144 	regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
145 			   info->mode_mask, new_mode);
146 
147 	return 0;
148 }
149 
150 
151 static const struct regulator_ops hi6421v530_ldo_ops = {
152 	.is_enabled = regulator_is_enabled_regmap,
153 	.enable = regulator_enable_regmap,
154 	.disable = regulator_disable_regmap,
155 	.list_voltage = regulator_list_voltage_table,
156 	.map_voltage = regulator_map_voltage_ascend,
157 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
158 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
159 	.get_mode = hi6421v530_regulator_ldo_get_mode,
160 	.set_mode = hi6421v530_regulator_ldo_set_mode,
161 };
162 
163 static int hi6421v530_regulator_probe(struct platform_device *pdev)
164 {
165 	struct hi6421_pmic *pmic;
166 	struct regulator_dev *rdev;
167 	struct regulator_config config = { };
168 	unsigned int i;
169 
170 	pmic = dev_get_drvdata(pdev->dev.parent);
171 	if (!pmic) {
172 		dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
173 		return -ENODEV;
174 	}
175 
176 	for (i = 0; i < ARRAY_SIZE(hi6421v530_regulator_info); i++) {
177 		config.dev = pdev->dev.parent;
178 		config.regmap = pmic->regmap;
179 		config.driver_data = &hi6421v530_regulator_info[i];
180 
181 		rdev = devm_regulator_register(&pdev->dev,
182 				&hi6421v530_regulator_info[i].rdesc,
183 				&config);
184 		if (IS_ERR(rdev)) {
185 			dev_err(&pdev->dev, "failed to register regulator %s\n",
186 				hi6421v530_regulator_info[i].rdesc.name);
187 			return PTR_ERR(rdev);
188 		}
189 	}
190 	return 0;
191 }
192 
193 static const struct platform_device_id hi6421v530_regulator_table[] = {
194 	{ .name = "hi6421v530-regulator" },
195 	{},
196 };
197 MODULE_DEVICE_TABLE(platform, hi6421v530_regulator_table);
198 
199 static struct platform_driver hi6421v530_regulator_driver = {
200 	.id_table = hi6421v530_regulator_table,
201 	.driver = {
202 		.name	= "hi6421v530-regulator",
203 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
204 	},
205 	.probe	= hi6421v530_regulator_probe,
206 };
207 module_platform_driver(hi6421v530_regulator_driver);
208 
209 MODULE_AUTHOR("Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>");
210 MODULE_DESCRIPTION("Hi6421v530 regulator driver");
211 MODULE_LICENSE("GPL v2");
212