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 
30 struct 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 
41 struct pbias_regulator_data {
42 	struct regulator_desc desc;
43 	void __iomem *pbias_addr;
44 	struct regulator_dev *dev;
45 	struct regmap *syscon;
46 	const struct pbias_reg_info *info;
47 	int voltage;
48 };
49 
50 struct pbias_of_data {
51 	unsigned int offset;
52 };
53 
54 static const unsigned int pbias_volt_table_3_0V[] = {
55 	1800000,
56 	3000000
57 };
58 
59 static const unsigned int pbias_volt_table_3_3V[] = {
60 	1800000,
61 	3300000
62 };
63 
64 static const struct regulator_ops pbias_regulator_voltage_ops = {
65 	.list_voltage = regulator_list_voltage_table,
66 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
67 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
68 	.enable = regulator_enable_regmap,
69 	.disable = regulator_disable_regmap,
70 	.is_enabled = regulator_is_enabled_regmap,
71 };
72 
73 static const struct pbias_reg_info pbias_mmc_omap2430 = {
74 	.enable = BIT(1),
75 	.enable_mask = BIT(1),
76 	.vmode = BIT(0),
77 	.disable_val = 0,
78 	.enable_time = 100,
79 	.pbias_volt_table = pbias_volt_table_3_0V,
80 	.n_voltages = 2,
81 	.name = "pbias_mmc_omap2430"
82 };
83 
84 static const struct pbias_reg_info pbias_sim_omap3 = {
85 	.enable = BIT(9),
86 	.enable_mask = BIT(9),
87 	.vmode = BIT(8),
88 	.enable_time = 100,
89 	.pbias_volt_table = pbias_volt_table_3_0V,
90 	.n_voltages = 2,
91 	.name = "pbias_sim_omap3"
92 };
93 
94 static const struct pbias_reg_info pbias_mmc_omap4 = {
95 	.enable = BIT(26) | BIT(22),
96 	.enable_mask = BIT(26) | BIT(25) | BIT(22),
97 	.disable_val = BIT(25),
98 	.vmode = BIT(21),
99 	.enable_time = 100,
100 	.pbias_volt_table = pbias_volt_table_3_0V,
101 	.n_voltages = 2,
102 	.name = "pbias_mmc_omap4"
103 };
104 
105 static const struct pbias_reg_info pbias_mmc_omap5 = {
106 	.enable = BIT(27) | BIT(26),
107 	.enable_mask = BIT(27) | BIT(25) | BIT(26),
108 	.disable_val = BIT(25),
109 	.vmode = BIT(21),
110 	.enable_time = 100,
111 	.pbias_volt_table = pbias_volt_table_3_3V,
112 	.n_voltages = 2,
113 	.name = "pbias_mmc_omap5"
114 };
115 
116 static struct of_regulator_match pbias_matches[] = {
117 	{ .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
118 	{ .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
119 	{ .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
120 	{ .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
121 };
122 #define PBIAS_NUM_REGS	ARRAY_SIZE(pbias_matches)
123 
124 /* Offset from SCM general area (and syscon) base */
125 
126 static const struct pbias_of_data pbias_of_data_omap2 = {
127 	.offset = 0x230,
128 };
129 
130 static const struct pbias_of_data pbias_of_data_omap3 = {
131 	.offset = 0x2b0,
132 };
133 
134 static const struct pbias_of_data pbias_of_data_omap4 = {
135 	.offset = 0x60,
136 };
137 
138 static const struct pbias_of_data pbias_of_data_omap5 = {
139 	.offset = 0x60,
140 };
141 
142 static const struct pbias_of_data pbias_of_data_dra7 = {
143 	.offset = 0xe00,
144 };
145 
146 static const struct of_device_id pbias_of_match[] = {
147 	{ .compatible = "ti,pbias-omap", },
148 	{ .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
149 	{ .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
150 	{ .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
151 	{ .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
152 	{ .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
153 	{},
154 };
155 MODULE_DEVICE_TABLE(of, pbias_of_match);
156 
157 static int pbias_regulator_probe(struct platform_device *pdev)
158 {
159 	struct device_node *np = pdev->dev.of_node;
160 	struct pbias_regulator_data *drvdata;
161 	struct resource *res;
162 	struct regulator_config cfg = { };
163 	struct regmap *syscon;
164 	const struct pbias_reg_info *info;
165 	int ret = 0;
166 	int count, idx, data_idx = 0;
167 	const struct of_device_id *match;
168 	const struct pbias_of_data *data;
169 	unsigned int offset;
170 
171 	count = of_regulator_match(&pdev->dev, np, pbias_matches,
172 						PBIAS_NUM_REGS);
173 	if (count < 0)
174 		return count;
175 
176 	drvdata = devm_kcalloc(&pdev->dev,
177 			       count, sizeof(struct pbias_regulator_data),
178 			       GFP_KERNEL);
179 	if (!drvdata)
180 		return -ENOMEM;
181 
182 	syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
183 	if (IS_ERR(syscon))
184 		return PTR_ERR(syscon);
185 
186 	match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev);
187 	if (match && match->data) {
188 		data = match->data;
189 		offset = data->offset;
190 	} else {
191 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
192 		if (!res)
193 			return -EINVAL;
194 
195 		offset = res->start;
196 		dev_WARN(&pdev->dev,
197 			 "using legacy dt data for pbias offset\n");
198 	}
199 
200 	cfg.regmap = syscon;
201 	cfg.dev = &pdev->dev;
202 
203 	for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
204 		if (!pbias_matches[idx].init_data ||
205 			!pbias_matches[idx].of_node)
206 			continue;
207 
208 		info = pbias_matches[idx].driver_data;
209 		if (!info)
210 			return -ENODEV;
211 
212 		drvdata[data_idx].syscon = syscon;
213 		drvdata[data_idx].info = info;
214 		drvdata[data_idx].desc.name = info->name;
215 		drvdata[data_idx].desc.owner = THIS_MODULE;
216 		drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
217 		drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
218 		drvdata[data_idx].desc.volt_table = info->pbias_volt_table;
219 		drvdata[data_idx].desc.n_voltages = info->n_voltages;
220 		drvdata[data_idx].desc.enable_time = info->enable_time;
221 		drvdata[data_idx].desc.vsel_reg = offset;
222 		drvdata[data_idx].desc.vsel_mask = info->vmode;
223 		drvdata[data_idx].desc.enable_reg = offset;
224 		drvdata[data_idx].desc.enable_mask = info->enable_mask;
225 		drvdata[data_idx].desc.enable_val = info->enable;
226 		drvdata[data_idx].desc.disable_val = info->disable_val;
227 
228 		cfg.init_data = pbias_matches[idx].init_data;
229 		cfg.driver_data = &drvdata[data_idx];
230 		cfg.of_node = pbias_matches[idx].of_node;
231 
232 		drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
233 					&drvdata[data_idx].desc, &cfg);
234 		if (IS_ERR(drvdata[data_idx].dev)) {
235 			ret = PTR_ERR(drvdata[data_idx].dev);
236 			dev_err(&pdev->dev,
237 				"Failed to register regulator: %d\n", ret);
238 			goto err_regulator;
239 		}
240 		data_idx++;
241 	}
242 
243 	platform_set_drvdata(pdev, drvdata);
244 
245 err_regulator:
246 	return ret;
247 }
248 
249 static struct platform_driver pbias_regulator_driver = {
250 	.probe		= pbias_regulator_probe,
251 	.driver		= {
252 		.name		= "pbias-regulator",
253 		.of_match_table = of_match_ptr(pbias_of_match),
254 	},
255 };
256 
257 module_platform_driver(pbias_regulator_driver);
258 
259 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
260 MODULE_DESCRIPTION("pbias voltage regulator");
261 MODULE_LICENSE("GPL");
262 MODULE_ALIAS("platform:pbias-regulator");
263