1/*
2 * AXP20x regulators driver.
3 *
4 * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
5 *
6 * This file is subject to the terms and conditions of the GNU General
7 * Public License. See the file "COPYING" in the main directory of this
8 * archive for more details.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/err.h>
17#include <linux/init.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/of_device.h>
21#include <linux/platform_device.h>
22#include <linux/regmap.h>
23#include <linux/mfd/axp20x.h>
24#include <linux/regulator/driver.h>
25#include <linux/regulator/of_regulator.h>
26
27#define AXP20X_IO_ENABLED		0x03
28#define AXP20X_IO_DISABLED		0x07
29
30#define AXP20X_WORKMODE_DCDC2_MASK	BIT(2)
31#define AXP20X_WORKMODE_DCDC3_MASK	BIT(1)
32
33#define AXP20X_FREQ_DCDC_MASK		0x0f
34
35#define AXP20X_DESC_IO(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg,   \
36		       _emask, _enable_val, _disable_val)			\
37	[AXP20X_##_id] = {							\
38		.name		= #_id,						\
39		.supply_name	= (_supply),					\
40		.type		= REGULATOR_VOLTAGE,				\
41		.id		= AXP20X_##_id,					\
42		.n_voltages	= (((_max) - (_min)) / (_step) + 1),		\
43		.owner		= THIS_MODULE,					\
44		.min_uV		= (_min) * 1000,				\
45		.uV_step	= (_step) * 1000,				\
46		.vsel_reg	= (_vreg),					\
47		.vsel_mask	= (_vmask),					\
48		.enable_reg	= (_ereg),					\
49		.enable_mask	= (_emask),					\
50		.enable_val	= (_enable_val),				\
51		.disable_val	= (_disable_val),				\
52		.ops		= &axp20x_ops,					\
53	}
54
55#define AXP20X_DESC(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg,	\
56		    _emask) 							\
57	[AXP20X_##_id] = {							\
58		.name		= #_id,						\
59		.supply_name	= (_supply),					\
60		.type		= REGULATOR_VOLTAGE,				\
61		.id		= AXP20X_##_id,					\
62		.n_voltages	= (((_max) - (_min)) / (_step) + 1),		\
63		.owner		= THIS_MODULE,					\
64		.min_uV		= (_min) * 1000,				\
65		.uV_step	= (_step) * 1000,				\
66		.vsel_reg	= (_vreg),					\
67		.vsel_mask	= (_vmask),					\
68		.enable_reg	= (_ereg),					\
69		.enable_mask	= (_emask),					\
70		.ops		= &axp20x_ops,					\
71	}
72
73#define AXP20X_DESC_FIXED(_id, _supply, _volt)					\
74	[AXP20X_##_id] = {							\
75		.name		= #_id,						\
76		.supply_name	= (_supply),					\
77		.type		= REGULATOR_VOLTAGE,				\
78		.id		= AXP20X_##_id,					\
79		.n_voltages	= 1,						\
80		.owner		= THIS_MODULE,					\
81		.min_uV		= (_volt) * 1000,				\
82		.ops		= &axp20x_ops_fixed				\
83	}
84
85#define AXP20X_DESC_TABLE(_id, _supply, _table, _vreg, _vmask, _ereg, _emask)	\
86	[AXP20X_##_id] = {							\
87		.name		= #_id,						\
88		.supply_name	= (_supply),					\
89		.type		= REGULATOR_VOLTAGE,				\
90		.id		= AXP20X_##_id,					\
91		.n_voltages	= ARRAY_SIZE(_table),				\
92		.owner		= THIS_MODULE,					\
93		.vsel_reg	= (_vreg),					\
94		.vsel_mask	= (_vmask),					\
95		.enable_reg	= (_ereg),					\
96		.enable_mask	= (_emask),					\
97		.volt_table	= (_table),					\
98		.ops		= &axp20x_ops_table,				\
99	}
100
101static const int axp20x_ldo4_data[] = { 1250000, 1300000, 1400000, 1500000, 1600000,
102					1700000, 1800000, 1900000, 2000000, 2500000,
103					2700000, 2800000, 3000000, 3100000, 3200000,
104					3300000 };
105
106static struct regulator_ops axp20x_ops_fixed = {
107	.list_voltage		= regulator_list_voltage_linear,
108};
109
110static struct regulator_ops axp20x_ops_table = {
111	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
112	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
113	.list_voltage		= regulator_list_voltage_table,
114	.map_voltage		= regulator_map_voltage_ascend,
115	.enable			= regulator_enable_regmap,
116	.disable		= regulator_disable_regmap,
117	.is_enabled		= regulator_is_enabled_regmap,
118};
119
120static struct regulator_ops axp20x_ops = {
121	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
122	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
123	.list_voltage		= regulator_list_voltage_linear,
124	.enable			= regulator_enable_regmap,
125	.disable		= regulator_disable_regmap,
126	.is_enabled		= regulator_is_enabled_regmap,
127};
128
129static const struct regulator_desc axp20x_regulators[] = {
130	AXP20X_DESC(DCDC2, "vin2", 700, 2275, 25, AXP20X_DCDC2_V_OUT, 0x3f,
131		    AXP20X_PWR_OUT_CTRL, 0x10),
132	AXP20X_DESC(DCDC3, "vin3", 700, 3500, 25, AXP20X_DCDC3_V_OUT, 0x7f,
133		    AXP20X_PWR_OUT_CTRL, 0x02),
134	AXP20X_DESC_FIXED(LDO1, "acin", 1300),
135	AXP20X_DESC(LDO2, "ldo24in", 1800, 3300, 100, AXP20X_LDO24_V_OUT, 0xf0,
136		    AXP20X_PWR_OUT_CTRL, 0x04),
137	AXP20X_DESC(LDO3, "ldo3in", 700, 3500, 25, AXP20X_LDO3_V_OUT, 0x7f,
138		    AXP20X_PWR_OUT_CTRL, 0x40),
139	AXP20X_DESC_TABLE(LDO4, "ldo24in", axp20x_ldo4_data, AXP20X_LDO24_V_OUT, 0x0f,
140			  AXP20X_PWR_OUT_CTRL, 0x08),
141	AXP20X_DESC_IO(LDO5, "ldo5in", 1800, 3300, 100, AXP20X_LDO5_V_OUT, 0xf0,
142		       AXP20X_GPIO0_CTRL, 0x07, AXP20X_IO_ENABLED,
143		       AXP20X_IO_DISABLED),
144};
145
146#define AXP_MATCH(_name, _id) \
147	[AXP20X_##_id] = { \
148		.name		= #_name, \
149		.driver_data	= (void *) &axp20x_regulators[AXP20X_##_id], \
150	}
151
152static struct of_regulator_match axp20x_matches[] = {
153	AXP_MATCH(dcdc2, DCDC2),
154	AXP_MATCH(dcdc3, DCDC3),
155	AXP_MATCH(ldo1, LDO1),
156	AXP_MATCH(ldo2, LDO2),
157	AXP_MATCH(ldo3, LDO3),
158	AXP_MATCH(ldo4, LDO4),
159	AXP_MATCH(ldo5, LDO5),
160};
161
162static int axp20x_set_dcdc_freq(struct platform_device *pdev, u32 dcdcfreq)
163{
164	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
165
166	if (dcdcfreq < 750) {
167		dcdcfreq = 750;
168		dev_warn(&pdev->dev, "DCDC frequency too low. Set to 750kHz\n");
169	}
170
171	if (dcdcfreq > 1875) {
172		dcdcfreq = 1875;
173		dev_warn(&pdev->dev, "DCDC frequency too high. Set to 1875kHz\n");
174	}
175
176	dcdcfreq = (dcdcfreq - 750) / 75;
177
178	return regmap_update_bits(axp20x->regmap, AXP20X_DCDC_FREQ,
179				  AXP20X_FREQ_DCDC_MASK, dcdcfreq);
180}
181
182static int axp20x_regulator_parse_dt(struct platform_device *pdev)
183{
184	struct device_node *np, *regulators;
185	int ret;
186	u32 dcdcfreq;
187
188	np = of_node_get(pdev->dev.parent->of_node);
189	if (!np)
190		return 0;
191
192	regulators = of_get_child_by_name(np, "regulators");
193	if (!regulators) {
194		dev_warn(&pdev->dev, "regulators node not found\n");
195	} else {
196		ret = of_regulator_match(&pdev->dev, regulators, axp20x_matches,
197					 ARRAY_SIZE(axp20x_matches));
198		if (ret < 0) {
199			dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
200			return ret;
201		}
202
203		dcdcfreq = 1500;
204		of_property_read_u32(regulators, "x-powers,dcdc-freq", &dcdcfreq);
205		ret = axp20x_set_dcdc_freq(pdev, dcdcfreq);
206		if (ret < 0) {
207			dev_err(&pdev->dev, "Error setting dcdc frequency: %d\n", ret);
208			return ret;
209		}
210
211		of_node_put(regulators);
212	}
213
214	return 0;
215}
216
217static int axp20x_set_dcdc_workmode(struct regulator_dev *rdev, int id, u32 workmode)
218{
219	unsigned int mask = AXP20X_WORKMODE_DCDC2_MASK;
220
221	if ((id != AXP20X_DCDC2) && (id != AXP20X_DCDC3))
222		return -EINVAL;
223
224	if (id == AXP20X_DCDC3)
225		mask = AXP20X_WORKMODE_DCDC3_MASK;
226
227	workmode <<= ffs(mask) - 1;
228
229	return regmap_update_bits(rdev->regmap, AXP20X_DCDC_MODE, mask, workmode);
230}
231
232static int axp20x_regulator_probe(struct platform_device *pdev)
233{
234	struct regulator_dev *rdev;
235	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
236	struct regulator_config config = { };
237	struct regulator_init_data *init_data;
238	int ret, i;
239	u32 workmode;
240
241	ret = axp20x_regulator_parse_dt(pdev);
242	if (ret)
243		return ret;
244
245	for (i = 0; i < AXP20X_REG_ID_MAX; i++) {
246		init_data = axp20x_matches[i].init_data;
247
248		config.dev = pdev->dev.parent;
249		config.init_data = init_data;
250		config.regmap = axp20x->regmap;
251		config.of_node = axp20x_matches[i].of_node;
252
253		rdev = devm_regulator_register(&pdev->dev, &axp20x_regulators[i],
254					       &config);
255		if (IS_ERR(rdev)) {
256			dev_err(&pdev->dev, "Failed to register %s\n",
257				axp20x_regulators[i].name);
258
259			return PTR_ERR(rdev);
260		}
261
262		ret = of_property_read_u32(axp20x_matches[i].of_node, "x-powers,dcdc-workmode",
263					   &workmode);
264		if (!ret) {
265			if (axp20x_set_dcdc_workmode(rdev, i, workmode))
266				dev_err(&pdev->dev, "Failed to set workmode on %s\n",
267					axp20x_regulators[i].name);
268		}
269	}
270
271	return 0;
272}
273
274static struct platform_driver axp20x_regulator_driver = {
275	.probe	= axp20x_regulator_probe,
276	.driver	= {
277		.name		= "axp20x-regulator",
278		.owner		= THIS_MODULE,
279	},
280};
281
282module_platform_driver(axp20x_regulator_driver);
283
284MODULE_LICENSE("GPL v2");
285MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
286MODULE_DESCRIPTION("Regulator Driver for AXP20X PMIC");
287