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
hi6421v530_regulator_ldo_get_mode(struct regulator_dev * rdev)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, ®_val);
119
120 if (reg_val & (info->mode_mask))
121 return REGULATOR_MODE_IDLE;
122
123 return REGULATOR_MODE_NORMAL;
124 }
125
hi6421v530_regulator_ldo_set_mode(struct regulator_dev * rdev,unsigned int mode)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
hi6421v530_regulator_probe(struct platform_device * pdev)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 },
204 .probe = hi6421v530_regulator_probe,
205 };
206 module_platform_driver(hi6421v530_regulator_driver);
207
208 MODULE_AUTHOR("Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>");
209 MODULE_DESCRIPTION("Hi6421v530 regulator driver");
210 MODULE_LICENSE("GPL v2");
211