1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Regulator driver for RICOH RC5T583 power management chip.
4 *
5 * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
6 * Author: Laxman dewangan <ldewangan@nvidia.com>
7 *
8 * based on code
9 *      Copyright (C) 2011 RICOH COMPANY,LTD
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/err.h>
16#include <linux/platform_device.h>
17#include <linux/regulator/driver.h>
18#include <linux/regulator/machine.h>
19#include <linux/mfd/rc5t583.h>
20
21struct rc5t583_regulator_info {
22	int			deepsleep_id;
23
24	/* Regulator register address.*/
25	uint8_t			reg_disc_reg;
26	uint8_t			disc_bit;
27	uint8_t			deepsleep_reg;
28
29	/* Regulator specific turn-on delay  and voltage settling time*/
30	int			enable_uv_per_us;
31
32	/* Used by regulator core */
33	struct regulator_desc	desc;
34};
35
36static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
37{
38	struct rc5t583_regulator_info *reg_info = rdev_get_drvdata(rdev);
39	int vsel = regulator_get_voltage_sel_regmap(rdev);
40	int curr_uV = regulator_list_voltage_linear(rdev, vsel);
41
42	return DIV_ROUND_UP(curr_uV, reg_info->enable_uv_per_us);
43}
44
45static const struct regulator_ops rc5t583_ops = {
46	.is_enabled		= regulator_is_enabled_regmap,
47	.enable			= regulator_enable_regmap,
48	.disable		= regulator_disable_regmap,
49	.enable_time		= rc5t583_regulator_enable_time,
50	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
51	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
52	.list_voltage		= regulator_list_voltage_linear,
53	.map_voltage		= regulator_map_voltage_linear,
54	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
55};
56
57#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
58		_vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
59{								\
60	.reg_disc_reg	= RC5T583_REG_##_disc_reg,		\
61	.disc_bit	= _disc_bit,				\
62	.deepsleep_reg	= RC5T583_REG_##_id##DAC_DS,		\
63	.enable_uv_per_us = _enable_mv * 1000,			\
64	.deepsleep_id	= RC5T583_DS_##_id,			\
65	.desc = {						\
66		.name = "rc5t583-regulator-"#_id,		\
67		.id = RC5T583_REGULATOR_##_id,			\
68		.n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
69		.ops = &rc5t583_ops,				\
70		.type = REGULATOR_VOLTAGE,			\
71		.owner = THIS_MODULE,				\
72		.vsel_reg = RC5T583_REG_##_id##DAC,		\
73		.vsel_mask = _vout_mask,			\
74		.enable_reg = RC5T583_REG_##_en_reg,		\
75		.enable_mask = BIT(_en_bit),			\
76		.min_uV	= _min_mv * 1000,			\
77		.uV_step = _step_uV,				\
78		.ramp_delay = 40 * 1000,			\
79	},							\
80}
81
82static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
83	RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
84	RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
85	RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
86	RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
87	RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
88	RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
89	RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
90	RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
91	RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
92	RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
93	RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
94	RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
95	RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
96	RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
97};
98
99static int rc5t583_regulator_probe(struct platform_device *pdev)
100{
101	struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
102	struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
103	struct regulator_config config = { };
104	struct regulator_dev *rdev;
105	struct rc5t583_regulator_info *ri;
106	int ret;
107	int id;
108
109	if (!pdata) {
110		dev_err(&pdev->dev, "No platform data, exiting...\n");
111		return -ENODEV;
112	}
113
114	for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
115		ri = &rc5t583_reg_info[id];
116
117		if (ri->deepsleep_id == RC5T583_DS_NONE)
118			goto skip_ext_pwr_config;
119
120		ret = rc5t583_ext_power_req_config(rc5t583->dev,
121				ri->deepsleep_id,
122				pdata->regulator_ext_pwr_control[id],
123				pdata->regulator_deepsleep_slot[id]);
124		/*
125		 * Configuring external control is not a major issue,
126		 * just give warning.
127		 */
128		if (ret < 0)
129			dev_warn(&pdev->dev,
130				"Failed to configure ext control %d\n", id);
131
132skip_ext_pwr_config:
133		config.dev = &pdev->dev;
134		config.init_data = pdata->reg_init_data[id];
135		config.driver_data = ri;
136		config.regmap = rc5t583->regmap;
137
138		rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
139		if (IS_ERR(rdev)) {
140			dev_err(&pdev->dev, "Failed to register regulator %s\n",
141						ri->desc.name);
142			return PTR_ERR(rdev);
143		}
144	}
145	return 0;
146}
147
148static struct platform_driver rc5t583_regulator_driver = {
149	.driver	= {
150		.name	= "rc5t583-regulator",
151		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
152	},
153	.probe		= rc5t583_regulator_probe,
154};
155
156static int __init rc5t583_regulator_init(void)
157{
158	return platform_driver_register(&rc5t583_regulator_driver);
159}
160subsys_initcall(rc5t583_regulator_init);
161
162static void __exit rc5t583_regulator_exit(void)
163{
164	platform_driver_unregister(&rc5t583_regulator_driver);
165}
166module_exit(rc5t583_regulator_exit);
167
168MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
169MODULE_DESCRIPTION("RC5T583 regulator driver");
170MODULE_ALIAS("platform:rc5t583-regulator");
171MODULE_LICENSE("GPL v2");
172