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 const 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, ®_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 const 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 const 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 const 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 const 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 = ®ulator_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 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
288 },
289 .probe = hi6421_spmi_regulator_probe,
290 };
291 module_platform_driver(hi6421_spmi_regulator_driver);
292
293 MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
294 MODULE_LICENSE("GPL v2");
295
296