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
 29struct pbias_reg_info {
 30	u32 enable;
 31	u32 enable_mask;
 32	u32 disable_val;
 33	u32 vmode;
 34	unsigned int enable_time;
 35	char *name;
 36	const unsigned int *pbias_volt_table;
 37	int n_voltages;
 38};
 39
 40struct pbias_of_data {
 41	unsigned int offset;
 42};
 43
 44static const unsigned int pbias_volt_table_3_0V[] = {
 45	1800000,
 46	3000000
 47};
 48
 49static const unsigned int pbias_volt_table_3_3V[] = {
 50	1800000,
 51	3300000
 52};
 53
 54static const struct regulator_ops pbias_regulator_voltage_ops = {
 55	.list_voltage = regulator_list_voltage_table,
 56	.get_voltage_sel = regulator_get_voltage_sel_regmap,
 57	.set_voltage_sel = regulator_set_voltage_sel_regmap,
 58	.enable = regulator_enable_regmap,
 59	.disable = regulator_disable_regmap,
 60	.is_enabled = regulator_is_enabled_regmap,
 61};
 62
 63static const struct pbias_reg_info pbias_mmc_omap2430 = {
 64	.enable = BIT(1),
 65	.enable_mask = BIT(1),
 66	.vmode = BIT(0),
 67	.disable_val = 0,
 68	.enable_time = 100,
 69	.pbias_volt_table = pbias_volt_table_3_0V,
 70	.n_voltages = 2,
 71	.name = "pbias_mmc_omap2430"
 72};
 73
 74static const struct pbias_reg_info pbias_sim_omap3 = {
 75	.enable = BIT(9),
 76	.enable_mask = BIT(9),
 77	.vmode = BIT(8),
 78	.enable_time = 100,
 79	.pbias_volt_table = pbias_volt_table_3_0V,
 80	.n_voltages = 2,
 81	.name = "pbias_sim_omap3"
 82};
 83
 84static const struct pbias_reg_info pbias_mmc_omap4 = {
 85	.enable = BIT(26) | BIT(22),
 86	.enable_mask = BIT(26) | BIT(25) | BIT(22),
 87	.disable_val = BIT(25),
 88	.vmode = BIT(21),
 89	.enable_time = 100,
 90	.pbias_volt_table = pbias_volt_table_3_0V,
 91	.n_voltages = 2,
 92	.name = "pbias_mmc_omap4"
 93};
 94
 95static const struct pbias_reg_info pbias_mmc_omap5 = {
 96	.enable = BIT(27) | BIT(26),
 97	.enable_mask = BIT(27) | BIT(25) | BIT(26),
 98	.disable_val = BIT(25),
 99	.vmode = BIT(21),
100	.enable_time = 100,
101	.pbias_volt_table = pbias_volt_table_3_3V,
102	.n_voltages = 2,
103	.name = "pbias_mmc_omap5"
104};
105
106static struct of_regulator_match pbias_matches[] = {
107	{ .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
108	{ .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
109	{ .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
110	{ .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
111};
112#define PBIAS_NUM_REGS	ARRAY_SIZE(pbias_matches)
113
114/* Offset from SCM general area (and syscon) base */
115
116static const struct pbias_of_data pbias_of_data_omap2 = {
117	.offset = 0x230,
118};
119
120static const struct pbias_of_data pbias_of_data_omap3 = {
121	.offset = 0x2b0,
122};
123
124static const struct pbias_of_data pbias_of_data_omap4 = {
125	.offset = 0x60,
126};
127
128static const struct pbias_of_data pbias_of_data_omap5 = {
129	.offset = 0x60,
130};
131
132static const struct pbias_of_data pbias_of_data_dra7 = {
133	.offset = 0xe00,
134};
135
136static const struct of_device_id pbias_of_match[] = {
137	{ .compatible = "ti,pbias-omap", },
138	{ .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
139	{ .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
140	{ .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
141	{ .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
142	{ .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
143	{},
144};
145MODULE_DEVICE_TABLE(of, pbias_of_match);
146
147static int pbias_regulator_probe(struct platform_device *pdev)
148{
149	struct device_node *np = pdev->dev.of_node;
150	struct resource *res;
151	struct regulator_config cfg = { };
152	struct regulator_desc *desc;
153	struct regulator_dev *rdev;
154	struct regmap *syscon;
155	const struct pbias_reg_info *info;
156	int ret, count, idx;
157	const struct pbias_of_data *data;
158	unsigned int offset;
159
160	count = of_regulator_match(&pdev->dev, np, pbias_matches,
161						PBIAS_NUM_REGS);
162	if (count < 0)
163		return count;
164
165	desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL);
166	if (!desc)
167		return -ENOMEM;
168
169	syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
170	if (IS_ERR(syscon))
171		return PTR_ERR(syscon);
172
173	data = of_device_get_match_data(&pdev->dev);
174	if (data) {
175		offset = data->offset;
176	} else {
177		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
178		if (!res)
179			return -EINVAL;
180
181		offset = res->start;
182		dev_WARN(&pdev->dev,
183			 "using legacy dt data for pbias offset\n");
184	}
185
186	cfg.regmap = syscon;
187	cfg.dev = &pdev->dev;
188
189	for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) {
190		if (!pbias_matches[idx].init_data ||
191			!pbias_matches[idx].of_node)
192			continue;
193
194		info = pbias_matches[idx].driver_data;
195		if (!info)
196			return -ENODEV;
197
198		desc->name = info->name;
199		desc->owner = THIS_MODULE;
200		desc->type = REGULATOR_VOLTAGE;
201		desc->ops = &pbias_regulator_voltage_ops;
202		desc->volt_table = info->pbias_volt_table;
203		desc->n_voltages = info->n_voltages;
204		desc->enable_time = info->enable_time;
205		desc->vsel_reg = offset;
206		desc->vsel_mask = info->vmode;
207		desc->enable_reg = offset;
208		desc->enable_mask = info->enable_mask;
209		desc->enable_val = info->enable;
210		desc->disable_val = info->disable_val;
211
212		cfg.init_data = pbias_matches[idx].init_data;
213		cfg.of_node = pbias_matches[idx].of_node;
214
215		rdev = devm_regulator_register(&pdev->dev, desc, &cfg);
216		if (IS_ERR(rdev)) {
217			ret = PTR_ERR(rdev);
218			dev_err(&pdev->dev,
219				"Failed to register regulator: %d\n", ret);
220			return ret;
221		}
222		desc++;
223		count--;
224	}
225
226	return 0;
227}
228
229static struct platform_driver pbias_regulator_driver = {
230	.probe		= pbias_regulator_probe,
231	.driver		= {
232		.name		= "pbias-regulator",
233		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
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");