1/*
2 * Device driver for regulators in Hi6421V530 IC
3 *
4 * Copyright (c) <2017> HiSilicon Technologies Co., Ltd.
5 * http://www.hisilicon.com
6 * Copyright (c) <2017> Linaro Ltd.
7 * http://www.linaro.org
8 *
9 * Author: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
10 * Guodong Xu <guodong.xu@linaro.org>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/mfd/hi6421-pmic.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/regmap.h>
22#include <linux/regulator/driver.h>
23
24/*
25 * struct hi6421v530_regulator_info - hi6421v530 regulator information
26 * @desc: regulator description
27 * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
28 * @eco_microamp: eco mode load upper limit (in uA), valid for LDOs only
29 */
30struct hi6421v530_regulator_info {
31 struct regulator_desc rdesc;
32 u8 mode_mask;
33 u32 eco_microamp;
34};
35
36/* HI6421v530 regulators */
37enum hi6421v530_regulator_id {
38 HI6421V530_LDO3,
39 HI6421V530_LDO9,
40 HI6421V530_LDO11,
41 HI6421V530_LDO15,
42 HI6421V530_LDO16,
43};
44
45static const unsigned int ldo_3_voltages[] = {
46 1800000, 1825000, 1850000, 1875000,
47 1900000, 1925000, 1950000, 1975000,
48 2000000, 2025000, 2050000, 2075000,
49 2100000, 2125000, 2150000, 2200000,
50};
51
52static const unsigned int ldo_9_11_voltages[] = {
53 1750000, 1800000, 1825000, 2800000,
54 2850000, 2950000, 3000000, 3300000,
55};
56
57static const unsigned int ldo_15_16_voltages[] = {
58 1750000, 1800000, 2400000, 2600000,
59 2700000, 2850000, 2950000, 3000000,
60};
61
62static const struct regulator_ops hi6421v530_ldo_ops;
63
64#define HI6421V530_LDO_ENABLE_TIME (350)
65
66/*
67 * _id - LDO id name string
68 * v_table - voltage table
69 * vreg - voltage select register
70 * vmask - voltage select mask
71 * ereg - enable register
72 * emask - enable mask
73 * odelay - off/on delay time in uS
74 * ecomask - eco mode mask
75 * ecoamp - eco mode load uppler limit in uA
76 */
77#define HI6421V530_LDO(_ID, v_table, vreg, vmask, ereg, emask, \
78 odelay, ecomask, ecoamp) { \
79 .rdesc = { \
80 .name = #_ID, \
81 .of_match = of_match_ptr(#_ID), \
82 .regulators_node = of_match_ptr("regulators"), \
83 .ops = &hi6421v530_ldo_ops, \
84 .type = REGULATOR_VOLTAGE, \
85 .id = HI6421V530_##_ID, \
86 .owner = THIS_MODULE, \
87 .n_voltages = ARRAY_SIZE(v_table), \
88 .volt_table = v_table, \
89 .vsel_reg = HI6421_REG_TO_BUS_ADDR(vreg), \
90 .vsel_mask = vmask, \
91 .enable_reg = HI6421_REG_TO_BUS_ADDR(ereg), \
92 .enable_mask = emask, \
93 .enable_time = HI6421V530_LDO_ENABLE_TIME, \
94 .off_on_delay = odelay, \
95 }, \
96 .mode_mask = ecomask, \
97 .eco_microamp = ecoamp, \
98}
99
100/* HI6421V530 regulator information */
101
102static struct hi6421v530_regulator_info hi6421v530_regulator_info[] = {
103 HI6421V530_LDO(LDO3, ldo_3_voltages, 0x061, 0xf, 0x060, 0x2,
104 20000, 0x6, 8000),
105 HI6421V530_LDO(LDO9, ldo_9_11_voltages, 0x06b, 0x7, 0x06a, 0x2,
106 40000, 0x6, 8000),
107 HI6421V530_LDO(LDO11, ldo_9_11_voltages, 0x06f, 0x7, 0x06e, 0x2,
108 40000, 0x6, 8000),
109 HI6421V530_LDO(LDO15, ldo_15_16_voltages, 0x077, 0x7, 0x076, 0x2,
110 40000, 0x6, 8000),
111 HI6421V530_LDO(LDO16, ldo_15_16_voltages, 0x079, 0x7, 0x078, 0x2,
112 40000, 0x6, 8000),
113};
114
115static unsigned int hi6421v530_regulator_ldo_get_mode(
116 struct regulator_dev *rdev)
117{
118 struct hi6421v530_regulator_info *info;
119 unsigned int reg_val;
120
121 info = rdev_get_drvdata(rdev);
122 regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
123
124 if (reg_val & (info->mode_mask))
125 return REGULATOR_MODE_IDLE;
126
127 return REGULATOR_MODE_NORMAL;
128}
129
130static int hi6421v530_regulator_ldo_set_mode(struct regulator_dev *rdev,
131 unsigned int mode)
132{
133 struct hi6421v530_regulator_info *info;
134 unsigned int new_mode;
135
136 info = rdev_get_drvdata(rdev);
137 switch (mode) {
138 case REGULATOR_MODE_NORMAL:
139 new_mode = 0;
140 break;
141 case REGULATOR_MODE_IDLE:
142 new_mode = info->mode_mask;
143 break;
144 default:
145 return -EINVAL;
146 }
147
148 regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
149 info->mode_mask, new_mode);
150
151 return 0;
152}
153
154
155static const struct regulator_ops hi6421v530_ldo_ops = {
156 .is_enabled = regulator_is_enabled_regmap,
157 .enable = regulator_enable_regmap,
158 .disable = regulator_disable_regmap,
159 .list_voltage = regulator_list_voltage_table,
160 .map_voltage = regulator_map_voltage_ascend,
161 .get_voltage_sel = regulator_get_voltage_sel_regmap,
162 .set_voltage_sel = regulator_set_voltage_sel_regmap,
163 .get_mode = hi6421v530_regulator_ldo_get_mode,
164 .set_mode = hi6421v530_regulator_ldo_set_mode,
165};
166
167static int hi6421v530_regulator_probe(struct platform_device *pdev)
168{
169 struct hi6421_pmic *pmic;
170 struct regulator_dev *rdev;
171 struct regulator_config config = { };
172 unsigned int i;
173
174 pmic = dev_get_drvdata(pdev->dev.parent);
175 if (!pmic) {
176 dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
177 return -ENODEV;
178 }
179
180 for (i = 0; i < ARRAY_SIZE(hi6421v530_regulator_info); i++) {
181 config.dev = pdev->dev.parent;
182 config.regmap = pmic->regmap;
183 config.driver_data = &hi6421v530_regulator_info[i];
184
185 rdev = devm_regulator_register(&pdev->dev,
186 &hi6421v530_regulator_info[i].rdesc,
187 &config);
188 if (IS_ERR(rdev)) {
189 dev_err(&pdev->dev, "failed to register regulator %s\n",
190 hi6421v530_regulator_info[i].rdesc.name);
191 return PTR_ERR(rdev);
192 }
193 }
194 return 0;
195}
196
197static const struct platform_device_id hi6421v530_regulator_table[] = {
198 { .name = "hi6421v530-regulator" },
199 {},
200};
201MODULE_DEVICE_TABLE(platform, hi6421v530_regulator_table);
202
203static struct platform_driver hi6421v530_regulator_driver = {
204 .id_table = hi6421v530_regulator_table,
205 .driver = {
206 .name = "hi6421v530-regulator",
207 },
208 .probe = hi6421v530_regulator_probe,
209};
210module_platform_driver(hi6421v530_regulator_driver);
211
212MODULE_AUTHOR("Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>");
213MODULE_DESCRIPTION("Hi6421v530 regulator driver");
214MODULE_LICENSE("GPL v2");
215