1/*
2 * arizona-ldo1.c  --  LDO1 supply for Arizona devices
3 *
4 * Copyright 2012 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 *  This program is free software; you can redistribute  it and/or modify it
9 *  under  the terms of  the GNU General  Public License as published by the
10 *  Free Software Foundation;  either version 2 of the  License, or (at your
11 *  option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/init.h>
17#include <linux/bitops.h>
18#include <linux/err.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/regulator/driver.h>
22#include <linux/regulator/machine.h>
23#include <linux/regulator/of_regulator.h>
24#include <linux/gpio.h>
25#include <linux/slab.h>
26
27#include <linux/mfd/arizona/core.h>
28#include <linux/mfd/arizona/pdata.h>
29#include <linux/mfd/arizona/registers.h>
30
31struct arizona_ldo1 {
32	struct regulator_dev *regulator;
33	struct arizona *arizona;
34
35	struct regulator_consumer_supply supply;
36	struct regulator_init_data init_data;
37};
38
39static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
40					unsigned int selector)
41{
42	if (selector >= rdev->desc->n_voltages)
43		return -EINVAL;
44
45	if (selector == rdev->desc->n_voltages - 1)
46		return 1800000;
47	else
48		return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
49}
50
51static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
52				       int min_uV, int max_uV)
53{
54	int sel;
55
56	sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
57	if (sel >= rdev->desc->n_voltages)
58		sel = rdev->desc->n_voltages - 1;
59
60	return sel;
61}
62
63static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
64					   unsigned sel)
65{
66	struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
67	struct regmap *regmap = ldo->arizona->regmap;
68	unsigned int val;
69	int ret;
70
71	if (sel == rdev->desc->n_voltages - 1)
72		val = ARIZONA_LDO1_HI_PWR;
73	else
74		val = 0;
75
76	ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
77				 ARIZONA_LDO1_HI_PWR, val);
78	if (ret != 0)
79		return ret;
80
81	ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
82				 ARIZONA_SUBSYS_MAX_FREQ, val);
83	if (ret != 0)
84		return ret;
85
86	if (val)
87		return 0;
88
89	val = sel << ARIZONA_LDO1_VSEL_SHIFT;
90
91	return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
92				  ARIZONA_LDO1_VSEL_MASK, val);
93}
94
95static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
96{
97	struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
98	struct regmap *regmap = ldo->arizona->regmap;
99	unsigned int val;
100	int ret;
101
102	ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
103	if (ret != 0)
104		return ret;
105
106	if (val & ARIZONA_LDO1_HI_PWR)
107		return rdev->desc->n_voltages - 1;
108
109	ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
110	if (ret != 0)
111		return ret;
112
113	return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
114}
115
116static struct regulator_ops arizona_ldo1_hc_ops = {
117	.list_voltage = arizona_ldo1_hc_list_voltage,
118	.map_voltage = arizona_ldo1_hc_map_voltage,
119	.get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
120	.set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
121	.get_bypass = regulator_get_bypass_regmap,
122	.set_bypass = regulator_set_bypass_regmap,
123};
124
125static const struct regulator_desc arizona_ldo1_hc = {
126	.name = "LDO1",
127	.supply_name = "LDOVDD",
128	.type = REGULATOR_VOLTAGE,
129	.ops = &arizona_ldo1_hc_ops,
130
131	.bypass_reg = ARIZONA_LDO1_CONTROL_1,
132	.bypass_mask = ARIZONA_LDO1_BYPASS,
133	.min_uV = 900000,
134	.uV_step = 50000,
135	.n_voltages = 8,
136	.enable_time = 1500,
137
138	.owner = THIS_MODULE,
139};
140
141static struct regulator_ops arizona_ldo1_ops = {
142	.list_voltage = regulator_list_voltage_linear,
143	.map_voltage = regulator_map_voltage_linear,
144	.get_voltage_sel = regulator_get_voltage_sel_regmap,
145	.set_voltage_sel = regulator_set_voltage_sel_regmap,
146};
147
148static const struct regulator_desc arizona_ldo1 = {
149	.name = "LDO1",
150	.supply_name = "LDOVDD",
151	.type = REGULATOR_VOLTAGE,
152	.ops = &arizona_ldo1_ops,
153
154	.vsel_reg = ARIZONA_LDO1_CONTROL_1,
155	.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
156	.min_uV = 900000,
157	.uV_step = 25000,
158	.n_voltages = 13,
159	.enable_time = 500,
160
161	.owner = THIS_MODULE,
162};
163
164static const struct regulator_init_data arizona_ldo1_dvfs = {
165	.constraints = {
166		.min_uV = 1200000,
167		.max_uV = 1800000,
168		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
169				  REGULATOR_CHANGE_VOLTAGE,
170	},
171	.num_consumer_supplies = 1,
172};
173
174static const struct regulator_init_data arizona_ldo1_default = {
175	.constraints = {
176		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
177	},
178	.num_consumer_supplies = 1,
179};
180
181static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
182				     struct regulator_config *config,
183				     const struct regulator_desc *desc)
184{
185	struct arizona_pdata *pdata = &arizona->pdata;
186	struct arizona_ldo1 *ldo1 = config->driver_data;
187	struct device_node *init_node, *dcvdd_node;
188	struct regulator_init_data *init_data;
189
190	pdata->ldoena = arizona_of_get_named_gpio(arizona, "wlf,ldoena", true);
191
192	init_node = of_get_child_by_name(arizona->dev->of_node, "ldo1");
193	dcvdd_node = of_parse_phandle(arizona->dev->of_node, "DCVDD-supply", 0);
194
195	if (init_node) {
196		config->of_node = init_node;
197
198		init_data = of_get_regulator_init_data(arizona->dev, init_node,
199						       desc);
200
201		if (init_data) {
202			init_data->consumer_supplies = &ldo1->supply;
203			init_data->num_consumer_supplies = 1;
204
205			if (dcvdd_node && dcvdd_node != init_node)
206				arizona->external_dcvdd = true;
207
208			pdata->ldo1 = init_data;
209		}
210	} else if (dcvdd_node) {
211		arizona->external_dcvdd = true;
212	}
213
214	of_node_put(dcvdd_node);
215
216	return 0;
217}
218
219static int arizona_ldo1_probe(struct platform_device *pdev)
220{
221	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
222	const struct regulator_desc *desc;
223	struct regulator_config config = { };
224	struct arizona_ldo1 *ldo1;
225	int ret;
226
227	arizona->external_dcvdd = false;
228
229	ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
230	if (!ldo1)
231		return -ENOMEM;
232
233	ldo1->arizona = arizona;
234
235	/*
236	 * Since the chip usually supplies itself we provide some
237	 * default init_data for it.  This will be overridden with
238	 * platform data if provided.
239	 */
240	switch (arizona->type) {
241	case WM5102:
242	case WM8997:
243		desc = &arizona_ldo1_hc;
244		ldo1->init_data = arizona_ldo1_dvfs;
245		break;
246	default:
247		desc = &arizona_ldo1;
248		ldo1->init_data = arizona_ldo1_default;
249		break;
250	}
251
252	ldo1->init_data.consumer_supplies = &ldo1->supply;
253	ldo1->supply.supply = "DCVDD";
254	ldo1->supply.dev_name = dev_name(arizona->dev);
255
256	config.dev = arizona->dev;
257	config.driver_data = ldo1;
258	config.regmap = arizona->regmap;
259
260	if (IS_ENABLED(CONFIG_OF)) {
261		if (!dev_get_platdata(arizona->dev)) {
262			ret = arizona_ldo1_of_get_pdata(arizona, &config, desc);
263			if (ret < 0)
264				return ret;
265
266			config.ena_gpio_initialized = true;
267		}
268	}
269
270	config.ena_gpio = arizona->pdata.ldoena;
271
272	if (arizona->pdata.ldo1)
273		config.init_data = arizona->pdata.ldo1;
274	else
275		config.init_data = &ldo1->init_data;
276
277	/*
278	 * LDO1 can only be used to supply DCVDD so if it has no
279	 * consumers then DCVDD is supplied externally.
280	 */
281	if (config.init_data->num_consumer_supplies == 0)
282		arizona->external_dcvdd = true;
283
284	ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
285
286	of_node_put(config.of_node);
287
288	if (IS_ERR(ldo1->regulator)) {
289		ret = PTR_ERR(ldo1->regulator);
290		dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
291			ret);
292		return ret;
293	}
294
295	platform_set_drvdata(pdev, ldo1);
296
297	return 0;
298}
299
300static struct platform_driver arizona_ldo1_driver = {
301	.probe = arizona_ldo1_probe,
302	.driver		= {
303		.name	= "arizona-ldo1",
304	},
305};
306
307module_platform_driver(arizona_ldo1_driver);
308
309/* Module information */
310MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
311MODULE_DESCRIPTION("Arizona LDO1 driver");
312MODULE_LICENSE("GPL");
313MODULE_ALIAS("platform:arizona-ldo1");
314