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 */
26struct hi6421v530_regulator_info {
27	struct regulator_desc rdesc;
28	u8 mode_mask;
29	u32 eco_microamp;
30};
31
32/* HI6421v530 regulators */
33enum hi6421v530_regulator_id {
34	HI6421V530_LDO3,
35	HI6421V530_LDO9,
36	HI6421V530_LDO11,
37	HI6421V530_LDO15,
38	HI6421V530_LDO16,
39};
40
41static 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
48static const unsigned int ldo_9_11_voltages[] = {
49	1750000, 1800000, 1825000, 2800000,
50	2850000, 2950000, 3000000, 3300000,
51};
52
53static const unsigned int ldo_15_16_voltages[] = {
54	1750000, 1800000, 2400000, 2600000,
55	2700000, 2850000, 2950000, 3000000,
56};
57
58static 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
98static 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
111static 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
126static 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
151static 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
163static 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
193static const struct platform_device_id hi6421v530_regulator_table[] = {
194	{ .name = "hi6421v530-regulator" },
195	{},
196};
197MODULE_DEVICE_TABLE(platform, hi6421v530_regulator_table);
198
199static 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};
207module_platform_driver(hi6421v530_regulator_driver);
208
209MODULE_AUTHOR("Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>");
210MODULE_DESCRIPTION("Hi6421v530 regulator driver");
211MODULE_LICENSE("GPL v2");
212