1/*
2 * pbias-regulator.c
3 *
4 * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
5 * Author: Balaji T K <balajitk@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation version 2.
10 *
11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
12 * kind, whether express or implied; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/err.h>
18#include <linux/io.h>
19#include <linux/module.h>
20#include <linux/mfd/syscon.h>
21#include <linux/platform_device.h>
22#include <linux/regulator/driver.h>
23#include <linux/regulator/machine.h>
24#include <linux/regulator/of_regulator.h>
25#include <linux/regmap.h>
26#include <linux/slab.h>
27#include <linux/of.h>
28#include <linux/of_device.h>
29
30struct pbias_reg_info {
31	u32 enable;
32	u32 enable_mask;
33	u32 disable_val;
34	u32 vmode;
35	unsigned int enable_time;
36	char *name;
37	const unsigned int *pbias_volt_table;
38	int n_voltages;
39};
40
41struct pbias_of_data {
42	unsigned int offset;
43};
44
45static const unsigned int pbias_volt_table_3_0V[] = {
46	1800000,
47	3000000
48};
49
50static const unsigned int pbias_volt_table_3_3V[] = {
51	1800000,
52	3300000
53};
54
55static const struct regulator_ops pbias_regulator_voltage_ops = {
56	.list_voltage = regulator_list_voltage_table,
57	.get_voltage_sel = regulator_get_voltage_sel_regmap,
58	.set_voltage_sel = regulator_set_voltage_sel_regmap,
59	.enable = regulator_enable_regmap,
60	.disable = regulator_disable_regmap,
61	.is_enabled = regulator_is_enabled_regmap,
62};
63
64static const struct pbias_reg_info pbias_mmc_omap2430 = {
65	.enable = BIT(1),
66	.enable_mask = BIT(1),
67	.vmode = BIT(0),
68	.disable_val = 0,
69	.enable_time = 100,
70	.pbias_volt_table = pbias_volt_table_3_0V,
71	.n_voltages = 2,
72	.name = "pbias_mmc_omap2430"
73};
74
75static const struct pbias_reg_info pbias_sim_omap3 = {
76	.enable = BIT(9),
77	.enable_mask = BIT(9),
78	.vmode = BIT(8),
79	.enable_time = 100,
80	.pbias_volt_table = pbias_volt_table_3_0V,
81	.n_voltages = 2,
82	.name = "pbias_sim_omap3"
83};
84
85static const struct pbias_reg_info pbias_mmc_omap4 = {
86	.enable = BIT(26) | BIT(22),
87	.enable_mask = BIT(26) | BIT(25) | BIT(22),
88	.disable_val = BIT(25),
89	.vmode = BIT(21),
90	.enable_time = 100,
91	.pbias_volt_table = pbias_volt_table_3_0V,
92	.n_voltages = 2,
93	.name = "pbias_mmc_omap4"
94};
95
96static const struct pbias_reg_info pbias_mmc_omap5 = {
97	.enable = BIT(27) | BIT(26),
98	.enable_mask = BIT(27) | BIT(25) | BIT(26),
99	.disable_val = BIT(25),
100	.vmode = BIT(21),
101	.enable_time = 100,
102	.pbias_volt_table = pbias_volt_table_3_3V,
103	.n_voltages = 2,
104	.name = "pbias_mmc_omap5"
105};
106
107static struct of_regulator_match pbias_matches[] = {
108	{ .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
109	{ .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
110	{ .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
111	{ .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
112};
113#define PBIAS_NUM_REGS	ARRAY_SIZE(pbias_matches)
114
115/* Offset from SCM general area (and syscon) base */
116
117static const struct pbias_of_data pbias_of_data_omap2 = {
118	.offset = 0x230,
119};
120
121static const struct pbias_of_data pbias_of_data_omap3 = {
122	.offset = 0x2b0,
123};
124
125static const struct pbias_of_data pbias_of_data_omap4 = {
126	.offset = 0x60,
127};
128
129static const struct pbias_of_data pbias_of_data_omap5 = {
130	.offset = 0x60,
131};
132
133static const struct pbias_of_data pbias_of_data_dra7 = {
134	.offset = 0xe00,
135};
136
137static const struct of_device_id pbias_of_match[] = {
138	{ .compatible = "ti,pbias-omap", },
139	{ .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
140	{ .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
141	{ .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
142	{ .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
143	{ .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
144	{},
145};
146MODULE_DEVICE_TABLE(of, pbias_of_match);
147
148static int pbias_regulator_probe(struct platform_device *pdev)
149{
150	struct device_node *np = pdev->dev.of_node;
151	struct resource *res;
152	struct regulator_config cfg = { };
153	struct regulator_desc *desc;
154	struct regulator_dev *rdev;
155	struct regmap *syscon;
156	const struct pbias_reg_info *info;
157	int ret, count, idx;
158	const struct pbias_of_data *data;
159	unsigned int offset;
160
161	count = of_regulator_match(&pdev->dev, np, pbias_matches,
162						PBIAS_NUM_REGS);
163	if (count < 0)
164		return count;
165
166	desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL);
167	if (!desc)
168		return -ENOMEM;
169
170	syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
171	if (IS_ERR(syscon))
172		return PTR_ERR(syscon);
173
174	data = of_device_get_match_data(&pdev->dev);
175	if (data) {
176		offset = data->offset;
177	} else {
178		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
179		if (!res)
180			return -EINVAL;
181
182		offset = res->start;
183		dev_WARN(&pdev->dev,
184			 "using legacy dt data for pbias offset\n");
185	}
186
187	cfg.regmap = syscon;
188	cfg.dev = &pdev->dev;
189
190	for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) {
191		if (!pbias_matches[idx].init_data ||
192			!pbias_matches[idx].of_node)
193			continue;
194
195		info = pbias_matches[idx].driver_data;
196		if (!info)
197			return -ENODEV;
198
199		desc->name = info->name;
200		desc->owner = THIS_MODULE;
201		desc->type = REGULATOR_VOLTAGE;
202		desc->ops = &pbias_regulator_voltage_ops;
203		desc->volt_table = info->pbias_volt_table;
204		desc->n_voltages = info->n_voltages;
205		desc->enable_time = info->enable_time;
206		desc->vsel_reg = offset;
207		desc->vsel_mask = info->vmode;
208		desc->enable_reg = offset;
209		desc->enable_mask = info->enable_mask;
210		desc->enable_val = info->enable;
211		desc->disable_val = info->disable_val;
212
213		cfg.init_data = pbias_matches[idx].init_data;
214		cfg.of_node = pbias_matches[idx].of_node;
215
216		rdev = devm_regulator_register(&pdev->dev, desc, &cfg);
217		if (IS_ERR(rdev)) {
218			ret = PTR_ERR(rdev);
219			dev_err(&pdev->dev,
220				"Failed to register regulator: %d\n", ret);
221			return ret;
222		}
223		desc++;
224		count--;
225	}
226
227	return 0;
228}
229
230static struct platform_driver pbias_regulator_driver = {
231	.probe		= pbias_regulator_probe,
232	.driver		= {
233		.name		= "pbias-regulator",
234		.of_match_table = of_match_ptr(pbias_of_match),
235	},
236};
237
238module_platform_driver(pbias_regulator_driver);
239
240MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
241MODULE_DESCRIPTION("pbias voltage regulator");
242MODULE_LICENSE("GPL");
243MODULE_ALIAS("platform:pbias-regulator");
244