1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Device driver for regulators in Hisi IC
4 //
5 // Copyright (c) 2013 Linaro Ltd.
6 // Copyright (c) 2011 HiSilicon Ltd.
7 // Copyright (c) 2020-2021 Huawei Technologies Co., Ltd
8 //
9 // Guodong Xu <guodong.xu@linaro.org>
10 
11 #include <linux/delay.h>
12 #include <linux/mfd/hi6421-spmi-pmic.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/spmi.h>
18 
19 struct hi6421_spmi_reg_priv {
20 	/* Serialize regulator enable logic */
21 	struct mutex enable_mutex;
22 };
23 
24 struct hi6421_spmi_reg_info {
25 	struct regulator_desc	desc;
26 	u8			eco_mode_mask;
27 	u32			eco_uA;
28 };
29 
30 static const unsigned int ldo3_voltages[] = {
31 	1500000, 1550000, 1600000, 1650000,
32 	1700000, 1725000, 1750000, 1775000,
33 	1800000, 1825000, 1850000, 1875000,
34 	1900000, 1925000, 1950000, 2000000
35 };
36 
37 static const unsigned int ldo4_voltages[] = {
38 	1725000, 1750000, 1775000, 1800000,
39 	1825000, 1850000, 1875000, 1900000
40 };
41 
42 static const unsigned int ldo9_voltages[] = {
43 	1750000, 1800000, 1825000, 2800000,
44 	2850000, 2950000, 3000000, 3300000
45 };
46 
47 static const unsigned int ldo15_voltages[] = {
48 	1800000, 1850000, 2400000, 2600000,
49 	2700000, 2850000, 2950000, 3000000
50 };
51 
52 static const unsigned int ldo17_voltages[] = {
53 	2500000, 2600000, 2700000, 2800000,
54 	3000000, 3100000, 3200000, 3300000
55 };
56 
57 static const unsigned int ldo34_voltages[] = {
58 	2600000, 2700000, 2800000, 2900000,
59 	3000000, 3100000, 3200000, 3300000
60 };
61 
62 /**
63  * HI6421V600_LDO() - specify a LDO power line
64  * @_id: LDO id name string
65  * @vtable: voltage table
66  * @ereg: enable register
67  * @emask: enable mask
68  * @vreg: voltage select register
69  * @odelay: off/on delay time in uS
70  * @etime: enable time in uS
71  * @ecomask: eco mode mask
72  * @ecoamp: eco mode load uppler limit in uA
73  */
74 #define HI6421V600_LDO(_id, vtable, ereg, emask, vreg,			       \
75 		       odelay, etime, ecomask, ecoamp)			       \
76 	[HI6421V600_##_id] = {						       \
77 		.desc = {						       \
78 			.name		= #_id,				       \
79 			.of_match        = of_match_ptr(#_id),		       \
80 			.regulators_node = of_match_ptr("regulators"),	       \
81 			.ops		= &hi6421_spmi_ldo_rops,	       \
82 			.type		= REGULATOR_VOLTAGE,		       \
83 			.id		= HI6421V600_##_id,		       \
84 			.owner		= THIS_MODULE,			       \
85 			.volt_table	= vtable,			       \
86 			.n_voltages	= ARRAY_SIZE(vtable),		       \
87 			.vsel_mask	= ARRAY_SIZE(vtable) - 1,	       \
88 			.vsel_reg	= vreg,				       \
89 			.enable_reg	= ereg,				       \
90 			.enable_mask	= emask,			       \
91 			.enable_time	= etime,			       \
92 			.ramp_delay	= etime,			       \
93 			.off_on_delay	= odelay,			       \
94 		},							       \
95 		.eco_mode_mask		= ecomask,			       \
96 		.eco_uA			= ecoamp,			       \
97 	}
98 
99 static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
100 {
101 	struct hi6421_spmi_reg_priv *priv;
102 	int ret;
103 
104 	priv = dev_get_drvdata(rdev->dev.parent);
105 	/* cannot enable more than one regulator at one time */
106 	mutex_lock(&priv->enable_mutex);
107 
108 	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
109 				 rdev->desc->enable_mask,
110 				 rdev->desc->enable_mask);
111 
112 	/* Avoid powering up multiple devices at the same time */
113 	usleep_range(rdev->desc->off_on_delay, rdev->desc->off_on_delay + 60);
114 
115 	mutex_unlock(&priv->enable_mutex);
116 
117 	return ret;
118 }
119 
120 static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
121 {
122 	struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
123 	unsigned int reg_val;
124 
125 	regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
126 
127 	if (reg_val & sreg->eco_mode_mask)
128 		return REGULATOR_MODE_IDLE;
129 
130 	return REGULATOR_MODE_NORMAL;
131 }
132 
133 static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
134 					  unsigned int mode)
135 {
136 	struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
137 	unsigned int val;
138 
139 	switch (mode) {
140 	case REGULATOR_MODE_NORMAL:
141 		val = 0;
142 		break;
143 	case REGULATOR_MODE_IDLE:
144 		if (!sreg->eco_mode_mask)
145 			return -EINVAL;
146 
147 		val = sreg->eco_mode_mask;
148 		break;
149 	default:
150 		return -EINVAL;
151 	}
152 
153 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
154 				  sreg->eco_mode_mask, val);
155 }
156 
157 static unsigned int
158 hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
159 				       int input_uV, int output_uV,
160 				       int load_uA)
161 {
162 	struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
163 
164 	if (!sreg->eco_uA || ((unsigned int)load_uA > sreg->eco_uA))
165 		return REGULATOR_MODE_NORMAL;
166 
167 	return REGULATOR_MODE_IDLE;
168 }
169 
170 static const struct regulator_ops hi6421_spmi_ldo_rops = {
171 	.is_enabled = regulator_is_enabled_regmap,
172 	.enable = hi6421_spmi_regulator_enable,
173 	.disable = regulator_disable_regmap,
174 	.list_voltage = regulator_list_voltage_table,
175 	.map_voltage = regulator_map_voltage_ascend,
176 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
177 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
178 	.get_mode = hi6421_spmi_regulator_get_mode,
179 	.set_mode = hi6421_spmi_regulator_set_mode,
180 	.get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
181 };
182 
183 /* HI6421v600 regulators with known registers */
184 enum hi6421_spmi_regulator_id {
185 	HI6421V600_LDO3,
186 	HI6421V600_LDO4,
187 	HI6421V600_LDO9,
188 	HI6421V600_LDO15,
189 	HI6421V600_LDO16,
190 	HI6421V600_LDO17,
191 	HI6421V600_LDO33,
192 	HI6421V600_LDO34,
193 };
194 
195 static struct hi6421_spmi_reg_info regulator_info[] = {
196 	HI6421V600_LDO(LDO3, ldo3_voltages,
197 		       0x16, 0x01, 0x51,
198 		       20000, 120,
199 		       0, 0),
200 	HI6421V600_LDO(LDO4, ldo4_voltages,
201 		       0x17, 0x01, 0x52,
202 		       20000, 120,
203 		       0x10, 10000),
204 	HI6421V600_LDO(LDO9, ldo9_voltages,
205 		       0x1c, 0x01, 0x57,
206 		       20000, 360,
207 		       0x10, 10000),
208 	HI6421V600_LDO(LDO15, ldo15_voltages,
209 		       0x21, 0x01, 0x5c,
210 		       20000, 360,
211 		       0x10, 10000),
212 	HI6421V600_LDO(LDO16, ldo15_voltages,
213 		       0x22, 0x01, 0x5d,
214 		       20000, 360,
215 		       0x10, 10000),
216 	HI6421V600_LDO(LDO17, ldo17_voltages,
217 		       0x23, 0x01, 0x5e,
218 		       20000, 120,
219 		       0x10, 10000),
220 	HI6421V600_LDO(LDO33, ldo17_voltages,
221 		       0x32, 0x01, 0x6d,
222 		       20000, 120,
223 		       0, 0),
224 	HI6421V600_LDO(LDO34, ldo34_voltages,
225 		       0x33, 0x01, 0x6e,
226 		       20000, 120,
227 		       0, 0),
228 };
229 
230 static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
231 {
232 	struct device *pmic_dev = pdev->dev.parent;
233 	struct regulator_config config = { };
234 	struct hi6421_spmi_reg_priv *priv;
235 	struct hi6421_spmi_reg_info *info;
236 	struct device *dev = &pdev->dev;
237 	struct hi6421_spmi_pmic *pmic;
238 	struct regulator_dev *rdev;
239 	int i;
240 
241 	/*
242 	 * This driver is meant to be called by hi6421-spmi-core,
243 	 * which should first set drvdata. If this doesn't happen, hit
244 	 * a warn on and return.
245 	 */
246 	pmic = dev_get_drvdata(pmic_dev);
247 	if (WARN_ON(!pmic))
248 		return -ENODEV;
249 
250 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
251 	if (!priv)
252 		return -ENOMEM;
253 
254 	mutex_init(&priv->enable_mutex);
255 	platform_set_drvdata(pdev, priv);
256 
257 	for (i = 0; i < ARRAY_SIZE(regulator_info); i++) {
258 		info = &regulator_info[i];
259 
260 		config.dev = pdev->dev.parent;
261 		config.driver_data = info;
262 		config.regmap = pmic->regmap;
263 
264 		rdev = devm_regulator_register(dev, &info->desc, &config);
265 		if (IS_ERR(rdev)) {
266 			dev_err(dev, "failed to register %s\n",
267 				info->desc.name);
268 			return PTR_ERR(rdev);
269 		}
270 	}
271 
272 	return 0;
273 }
274 
275 static const struct platform_device_id hi6421_spmi_regulator_table[] = {
276 	{ .name = "hi6421v600-regulator" },
277 	{},
278 };
279 MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);
280 
281 static struct platform_driver hi6421_spmi_regulator_driver = {
282 	.id_table = hi6421_spmi_regulator_table,
283 	.driver = {
284 		.name = "hi6421v600-regulator",
285 	},
286 	.probe	= hi6421_spmi_regulator_probe,
287 };
288 module_platform_driver(hi6421_spmi_regulator_driver);
289 
290 MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
291 MODULE_LICENSE("GPL v2");
292 
293