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/module.h>
13 #include <linux/of.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 range_1v5_to_2v0[] = {
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 range_1v725_to_1v9[] = {
38 	1725000, 1750000, 1775000, 1800000,
39 	1825000, 1850000, 1875000, 1900000
40 };
41 
42 static const unsigned int range_1v75_to_3v3[] = {
43 	1750000, 1800000, 1825000, 2800000,
44 	2850000, 2950000, 3000000, 3300000
45 };
46 
47 static const unsigned int range_1v8_to_3v0[] = {
48 	1800000, 1850000, 2400000, 2600000,
49 	2700000, 2850000, 2950000, 3000000
50 };
51 
52 static const unsigned int range_2v5_to_3v3[] = {
53 	2500000, 2600000, 2700000, 2800000,
54 	3000000, 3100000, 3200000, 3300000
55 };
56 
57 static const unsigned int range_2v6_to_3v3[] = {
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 
hi6421_spmi_regulator_enable(struct regulator_dev * rdev)99 static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
100 {
101 	struct hi6421_spmi_reg_priv *priv = rdev_get_drvdata(rdev);
102 	int ret;
103 
104 	/* cannot enable more than one regulator at one time */
105 	mutex_lock(&priv->enable_mutex);
106 
107 	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
108 				 rdev->desc->enable_mask,
109 				 rdev->desc->enable_mask);
110 
111 	/* Avoid powering up multiple devices at the same time */
112 	usleep_range(rdev->desc->off_on_delay, rdev->desc->off_on_delay + 60);
113 
114 	mutex_unlock(&priv->enable_mutex);
115 
116 	return ret;
117 }
118 
hi6421_spmi_regulator_get_mode(struct regulator_dev * rdev)119 static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
120 {
121 	struct hi6421_spmi_reg_info *sreg;
122 	unsigned int reg_val;
123 
124 	sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
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 
hi6421_spmi_regulator_set_mode(struct regulator_dev * rdev,unsigned int mode)133 static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
134 					  unsigned int mode)
135 {
136 	struct hi6421_spmi_reg_info *sreg;
137 	unsigned int val;
138 
139 	sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
140 	switch (mode) {
141 	case REGULATOR_MODE_NORMAL:
142 		val = 0;
143 		break;
144 	case REGULATOR_MODE_IDLE:
145 		if (!sreg->eco_mode_mask)
146 			return -EINVAL;
147 
148 		val = sreg->eco_mode_mask;
149 		break;
150 	default:
151 		return -EINVAL;
152 	}
153 
154 	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
155 				  sreg->eco_mode_mask, val);
156 }
157 
158 static unsigned int
hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev * rdev,int input_uV,int output_uV,int load_uA)159 hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
160 				       int input_uV, int output_uV,
161 				       int load_uA)
162 {
163 	struct hi6421_spmi_reg_info *sreg;
164 
165 	sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);
166 
167 	if (!sreg->eco_uA || ((unsigned int)load_uA > sreg->eco_uA))
168 		return REGULATOR_MODE_NORMAL;
169 
170 	return REGULATOR_MODE_IDLE;
171 }
172 
173 static const struct regulator_ops hi6421_spmi_ldo_rops = {
174 	.is_enabled = regulator_is_enabled_regmap,
175 	.enable = hi6421_spmi_regulator_enable,
176 	.disable = regulator_disable_regmap,
177 	.list_voltage = regulator_list_voltage_table,
178 	.map_voltage = regulator_map_voltage_ascend,
179 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
180 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
181 	.get_mode = hi6421_spmi_regulator_get_mode,
182 	.set_mode = hi6421_spmi_regulator_set_mode,
183 	.get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
184 };
185 
186 /* HI6421v600 regulators with known registers */
187 enum hi6421_spmi_regulator_id {
188 	hi6421v600_ldo3,
189 	hi6421v600_ldo4,
190 	hi6421v600_ldo9,
191 	hi6421v600_ldo15,
192 	hi6421v600_ldo16,
193 	hi6421v600_ldo17,
194 	hi6421v600_ldo33,
195 	hi6421v600_ldo34,
196 };
197 
198 static struct hi6421_spmi_reg_info regulator_info[] = {
199 	HI6421V600_LDO(ldo3, range_1v5_to_2v0,
200 		       0x16, 0x01, 0x51,
201 		       20000, 120,
202 		       0, 0),
203 	HI6421V600_LDO(ldo4, range_1v725_to_1v9,
204 		       0x17, 0x01, 0x52,
205 		       20000, 120,
206 		       0x10, 10000),
207 	HI6421V600_LDO(ldo9, range_1v75_to_3v3,
208 		       0x1c, 0x01, 0x57,
209 		       20000, 360,
210 		       0x10, 10000),
211 	HI6421V600_LDO(ldo15, range_1v8_to_3v0,
212 		       0x21, 0x01, 0x5c,
213 		       20000, 360,
214 		       0x10, 10000),
215 	HI6421V600_LDO(ldo16, range_1v8_to_3v0,
216 		       0x22, 0x01, 0x5d,
217 		       20000, 360,
218 		       0x10, 10000),
219 	HI6421V600_LDO(ldo17, range_2v5_to_3v3,
220 		       0x23, 0x01, 0x5e,
221 		       20000, 120,
222 		       0x10, 10000),
223 	HI6421V600_LDO(ldo33, range_2v5_to_3v3,
224 		       0x32, 0x01, 0x6d,
225 		       20000, 120,
226 		       0, 0),
227 	HI6421V600_LDO(ldo34, range_2v6_to_3v3,
228 		       0x33, 0x01, 0x6e,
229 		       20000, 120,
230 		       0, 0),
231 };
232 
hi6421_spmi_regulator_probe(struct platform_device * pdev)233 static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
234 {
235 	struct device *pmic_dev = pdev->dev.parent;
236 	struct regulator_config config = { };
237 	struct hi6421_spmi_reg_priv *priv;
238 	struct hi6421_spmi_reg_info *info;
239 	struct device *dev = &pdev->dev;
240 	struct regmap *regmap;
241 	struct regulator_dev *rdev;
242 	int i;
243 
244 	/*
245 	 * This driver is meant to be called by hi6421-spmi-core,
246 	 * which should first set drvdata. If this doesn't happen, hit
247 	 * a warn on and return.
248 	 */
249 	regmap = dev_get_drvdata(pmic_dev);
250 	if (WARN_ON(!regmap))
251 		return -ENODEV;
252 
253 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
254 	if (!priv)
255 		return -ENOMEM;
256 
257 	mutex_init(&priv->enable_mutex);
258 
259 	for (i = 0; i < ARRAY_SIZE(regulator_info); i++) {
260 		info = &regulator_info[i];
261 
262 		config.dev = pdev->dev.parent;
263 		config.driver_data = priv;
264 		config.regmap = regmap;
265 
266 		rdev = devm_regulator_register(dev, &info->desc, &config);
267 		if (IS_ERR(rdev)) {
268 			dev_err(dev, "failed to register %s\n",
269 				info->desc.name);
270 			return PTR_ERR(rdev);
271 		}
272 	}
273 
274 	return 0;
275 }
276 
277 static const struct platform_device_id hi6421_spmi_regulator_table[] = {
278 	{ .name = "hi6421v600-regulator" },
279 	{},
280 };
281 MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);
282 
283 static struct platform_driver hi6421_spmi_regulator_driver = {
284 	.id_table = hi6421_spmi_regulator_table,
285 	.driver = {
286 		.name = "hi6421v600-regulator",
287 	},
288 	.probe	= hi6421_spmi_regulator_probe,
289 };
290 module_platform_driver(hi6421_spmi_regulator_driver);
291 
292 MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
293 MODULE_LICENSE("GPL v2");
294 
295