1/*
2 * pbias-regulator.c
3 *
4 * Copyright (C) 2014 Texas Instruments Incorporated - http://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};
38
39struct pbias_regulator_data {
40	struct regulator_desc desc;
41	void __iomem *pbias_addr;
42	struct regulator_dev *dev;
43	struct regmap *syscon;
44	const struct pbias_reg_info *info;
45	int voltage;
46};
47
48struct pbias_of_data {
49	unsigned int offset;
50};
51
52static const unsigned int pbias_volt_table[] = {
53	1800000,
54	3000000
55};
56
57static struct regulator_ops pbias_regulator_voltage_ops = {
58	.list_voltage = regulator_list_voltage_table,
59	.get_voltage_sel = regulator_get_voltage_sel_regmap,
60	.set_voltage_sel = regulator_set_voltage_sel_regmap,
61	.enable = regulator_enable_regmap,
62	.disable = regulator_disable_regmap,
63	.is_enabled = regulator_is_enabled_regmap,
64};
65
66static const struct pbias_reg_info pbias_mmc_omap2430 = {
67	.enable = BIT(1),
68	.enable_mask = BIT(1),
69	.vmode = BIT(0),
70	.disable_val = 0,
71	.enable_time = 100,
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	.name = "pbias_sim_omap3"
81};
82
83static const struct pbias_reg_info pbias_mmc_omap4 = {
84	.enable = BIT(26) | BIT(22),
85	.enable_mask = BIT(26) | BIT(25) | BIT(22),
86	.disable_val = BIT(25),
87	.vmode = BIT(21),
88	.enable_time = 100,
89	.name = "pbias_mmc_omap4"
90};
91
92static const struct pbias_reg_info pbias_mmc_omap5 = {
93	.enable = BIT(27) | BIT(26),
94	.enable_mask = BIT(27) | BIT(25) | BIT(26),
95	.disable_val = BIT(25),
96	.vmode = BIT(21),
97	.enable_time = 100,
98	.name = "pbias_mmc_omap5"
99};
100
101static struct of_regulator_match pbias_matches[] = {
102	{ .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
103	{ .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
104	{ .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
105	{ .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
106};
107#define PBIAS_NUM_REGS	ARRAY_SIZE(pbias_matches)
108
109/* Offset from SCM general area (and syscon) base */
110
111static const struct pbias_of_data pbias_of_data_omap2 = {
112	.offset = 0x230,
113};
114
115static const struct pbias_of_data pbias_of_data_omap3 = {
116	.offset = 0x2b0,
117};
118
119static const struct pbias_of_data pbias_of_data_omap4 = {
120	.offset = 0x60,
121};
122
123static const struct pbias_of_data pbias_of_data_omap5 = {
124	.offset = 0x60,
125};
126
127static const struct pbias_of_data pbias_of_data_dra7 = {
128	.offset = 0xe00,
129};
130
131static const struct of_device_id pbias_of_match[] = {
132	{ .compatible = "ti,pbias-omap", },
133	{ .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
134	{ .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
135	{ .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
136	{ .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
137	{ .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
138	{},
139};
140MODULE_DEVICE_TABLE(of, pbias_of_match);
141
142static int pbias_regulator_probe(struct platform_device *pdev)
143{
144	struct device_node *np = pdev->dev.of_node;
145	struct pbias_regulator_data *drvdata;
146	struct resource *res;
147	struct regulator_config cfg = { };
148	struct regmap *syscon;
149	const struct pbias_reg_info *info;
150	int ret = 0;
151	int count, idx, data_idx = 0;
152	const struct of_device_id *match;
153	const struct pbias_of_data *data;
154	unsigned int offset;
155
156	count = of_regulator_match(&pdev->dev, np, pbias_matches,
157						PBIAS_NUM_REGS);
158	if (count < 0)
159		return count;
160
161	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
162			       * count, GFP_KERNEL);
163	if (!drvdata)
164		return -ENOMEM;
165
166	syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
167	if (IS_ERR(syscon))
168		return PTR_ERR(syscon);
169
170	match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev);
171	if (match && match->data) {
172		data = match->data;
173		offset = data->offset;
174	} else {
175		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
176		if (!res)
177			return -EINVAL;
178
179		offset = res->start;
180		dev_WARN(&pdev->dev,
181			 "using legacy dt data for pbias offset\n");
182	}
183
184	cfg.regmap = syscon;
185	cfg.dev = &pdev->dev;
186
187	for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
188		if (!pbias_matches[idx].init_data ||
189			!pbias_matches[idx].of_node)
190			continue;
191
192		info = pbias_matches[idx].driver_data;
193		if (!info)
194			return -ENODEV;
195
196		drvdata[data_idx].syscon = syscon;
197		drvdata[data_idx].info = info;
198		drvdata[data_idx].desc.name = info->name;
199		drvdata[data_idx].desc.owner = THIS_MODULE;
200		drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
201		drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
202		drvdata[data_idx].desc.volt_table = pbias_volt_table;
203		drvdata[data_idx].desc.n_voltages = 2;
204		drvdata[data_idx].desc.enable_time = info->enable_time;
205		drvdata[data_idx].desc.vsel_reg = offset;
206		drvdata[data_idx].desc.vsel_mask = info->vmode;
207		drvdata[data_idx].desc.enable_reg = offset;
208		drvdata[data_idx].desc.enable_mask = info->enable_mask;
209		drvdata[data_idx].desc.enable_val = info->enable;
210		drvdata[data_idx].desc.disable_val = info->disable_val;
211
212		cfg.init_data = pbias_matches[idx].init_data;
213		cfg.driver_data = &drvdata[data_idx];
214		cfg.of_node = pbias_matches[idx].of_node;
215
216		drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
217					&drvdata[data_idx].desc, &cfg);
218		if (IS_ERR(drvdata[data_idx].dev)) {
219			ret = PTR_ERR(drvdata[data_idx].dev);
220			dev_err(&pdev->dev,
221				"Failed to register regulator: %d\n", ret);
222			goto err_regulator;
223		}
224		data_idx++;
225	}
226
227	platform_set_drvdata(pdev, drvdata);
228
229err_regulator:
230	return ret;
231}
232
233static struct platform_driver pbias_regulator_driver = {
234	.probe		= pbias_regulator_probe,
235	.driver		= {
236		.name		= "pbias-regulator",
237		.of_match_table = of_match_ptr(pbias_of_match),
238	},
239};
240
241module_platform_driver(pbias_regulator_driver);
242
243MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
244MODULE_DESCRIPTION("pbias voltage regulator");
245MODULE_LICENSE("GPL");
246MODULE_ALIAS("platform:pbias-regulator");
247