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.
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_info {
20 struct regulator_desc desc;
21 struct hi6421_spmi_pmic *pmic;
22 u8 eco_mode_mask;
23 u32 eco_uA;
24
25 /* Serialize regulator enable logic */
26 struct mutex enable_mutex;
27 };
28
29 static const unsigned int ldo3_voltages[] = {
30 1500000, 1550000, 1600000, 1650000,
31 1700000, 1725000, 1750000, 1775000,
32 1800000, 1825000, 1850000, 1875000,
33 1900000, 1925000, 1950000, 2000000
34 };
35
36 static const unsigned int ldo4_voltages[] = {
37 1725000, 1750000, 1775000, 1800000,
38 1825000, 1850000, 1875000, 1900000
39 };
40
41 static const unsigned int ldo9_voltages[] = {
42 1750000, 1800000, 1825000, 2800000,
43 2850000, 2950000, 3000000, 3300000
44 };
45
46 static const unsigned int ldo15_voltages[] = {
47 1800000, 1850000, 2400000, 2600000,
48 2700000, 2850000, 2950000, 3000000
49 };
50
51 static const unsigned int ldo17_voltages[] = {
52 2500000, 2600000, 2700000, 2800000,
53 3000000, 3100000, 3200000, 3300000
54 };
55
56 static const unsigned int ldo34_voltages[] = {
57 2600000, 2700000, 2800000, 2900000,
58 3000000, 3100000, 3200000, 3300000
59 };
60
61 /**
62 * HI6421V600_LDO() - specify a LDO power line
63 * @_id: LDO id name string
64 * @vtable: voltage table
65 * @ereg: enable register
66 * @emask: enable mask
67 * @vreg: voltage select register
68 * @odelay: off/on delay time in uS
69 * @etime: enable time in uS
70 * @ecomask: eco mode mask
71 * @ecoamp: eco mode load uppler limit in uA
72 */
73 #define HI6421V600_LDO(_id, vtable, ereg, emask, vreg, \
74 odelay, etime, ecomask, ecoamp) \
75 [HI6421V600_##_id] = { \
76 .desc = { \
77 .name = #_id, \
78 .of_match = of_match_ptr(#_id), \
79 .regulators_node = of_match_ptr("regulators"), \
80 .ops = &hi6421_spmi_ldo_rops, \
81 .type = REGULATOR_VOLTAGE, \
82 .id = HI6421V600_##_id, \
83 .owner = THIS_MODULE, \
84 .volt_table = vtable, \
85 .n_voltages = ARRAY_SIZE(vtable), \
86 .vsel_mask = (1 << (ARRAY_SIZE(vtable) - 1)) - 1, \
87 .vsel_reg = vreg, \
88 .enable_reg = ereg, \
89 .enable_mask = emask, \
90 .enable_time = etime, \
91 .ramp_delay = etime, \
92 .off_on_delay = odelay, \
93 }, \
94 .eco_mode_mask = ecomask, \
95 .eco_uA = ecoamp, \
96 }
97
hi6421_spmi_regulator_enable(struct regulator_dev * rdev)98 static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
99 {
100 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
101 struct hi6421_spmi_pmic *pmic = sreg->pmic;
102 int ret;
103
104 /* cannot enable more than one regulator at one time */
105 mutex_lock(&sreg->enable_mutex);
106
107 ret = regmap_update_bits(pmic->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(&sreg->enable_mutex);
115
116 return ret;
117 }
118
hi6421_spmi_regulator_disable(struct regulator_dev * rdev)119 static int hi6421_spmi_regulator_disable(struct regulator_dev *rdev)
120 {
121 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
122 struct hi6421_spmi_pmic *pmic = sreg->pmic;
123
124 return regmap_update_bits(pmic->regmap, rdev->desc->enable_reg,
125 rdev->desc->enable_mask, 0);
126 }
127
hi6421_spmi_regulator_get_mode(struct regulator_dev * rdev)128 static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
129 {
130 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
131 struct hi6421_spmi_pmic *pmic = sreg->pmic;
132 u32 reg_val;
133
134 regmap_read(pmic->regmap, rdev->desc->enable_reg, ®_val);
135
136 if (reg_val & sreg->eco_mode_mask)
137 return REGULATOR_MODE_IDLE;
138
139 return REGULATOR_MODE_NORMAL;
140 }
141
hi6421_spmi_regulator_set_mode(struct regulator_dev * rdev,unsigned int mode)142 static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
143 unsigned int mode)
144 {
145 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
146 struct hi6421_spmi_pmic *pmic = sreg->pmic;
147 u32 val;
148
149 switch (mode) {
150 case REGULATOR_MODE_NORMAL:
151 val = 0;
152 break;
153 case REGULATOR_MODE_IDLE:
154 val = sreg->eco_mode_mask << (ffs(sreg->eco_mode_mask) - 1);
155 break;
156 default:
157 return -EINVAL;
158 }
159
160 return regmap_update_bits(pmic->regmap, rdev->desc->enable_reg,
161 sreg->eco_mode_mask, val);
162 }
163
164 static unsigned int
hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev * rdev,int input_uV,int output_uV,int load_uA)165 hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
166 int input_uV, int output_uV,
167 int load_uA)
168 {
169 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
170
171 if (!sreg->eco_uA || ((unsigned int)load_uA > sreg->eco_uA))
172 return REGULATOR_MODE_NORMAL;
173
174 return REGULATOR_MODE_IDLE;
175 }
176
177 static const struct regulator_ops hi6421_spmi_ldo_rops = {
178 .is_enabled = regulator_is_enabled_regmap,
179 .enable = hi6421_spmi_regulator_enable,
180 .disable = hi6421_spmi_regulator_disable,
181 .list_voltage = regulator_list_voltage_table,
182 .map_voltage = regulator_map_voltage_iterate,
183 .get_voltage_sel = regulator_get_voltage_sel_regmap,
184 .set_voltage_sel = regulator_set_voltage_sel_regmap,
185 .get_mode = hi6421_spmi_regulator_get_mode,
186 .set_mode = hi6421_spmi_regulator_set_mode,
187 .get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
188 };
189
190 /* HI6421v600 regulators with known registers */
191 enum hi6421_spmi_regulator_id {
192 HI6421V600_LDO3,
193 HI6421V600_LDO4,
194 HI6421V600_LDO9,
195 HI6421V600_LDO15,
196 HI6421V600_LDO16,
197 HI6421V600_LDO17,
198 HI6421V600_LDO33,
199 HI6421V600_LDO34,
200 };
201
202 static struct hi6421_spmi_reg_info regulator_info[] = {
203 HI6421V600_LDO(LDO3, ldo3_voltages,
204 0x16, 0x01, 0x51,
205 20000, 120,
206 0, 0),
207 HI6421V600_LDO(LDO4, ldo4_voltages,
208 0x17, 0x01, 0x52,
209 20000, 120,
210 0x10, 10000),
211 HI6421V600_LDO(LDO9, ldo9_voltages,
212 0x1c, 0x01, 0x57,
213 20000, 360,
214 0x10, 10000),
215 HI6421V600_LDO(LDO15, ldo15_voltages,
216 0x21, 0x01, 0x5c,
217 20000, 360,
218 0x10, 10000),
219 HI6421V600_LDO(LDO16, ldo15_voltages,
220 0x22, 0x01, 0x5d,
221 20000, 360,
222 0x10, 10000),
223 HI6421V600_LDO(LDO17, ldo17_voltages,
224 0x23, 0x01, 0x5e,
225 20000, 120,
226 0x10, 10000),
227 HI6421V600_LDO(LDO33, ldo17_voltages,
228 0x32, 0x01, 0x6d,
229 20000, 120,
230 0, 0),
231 HI6421V600_LDO(LDO34, ldo34_voltages,
232 0x33, 0x01, 0x6e,
233 20000, 120,
234 0, 0),
235 };
236
hi6421_spmi_regulator_probe(struct platform_device * pdev)237 static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
238 {
239 struct device *pmic_dev = pdev->dev.parent;
240 struct regulator_config config = { };
241 struct hi6421_spmi_reg_info *sreg;
242 struct hi6421_spmi_reg_info *info;
243 struct device *dev = &pdev->dev;
244 struct hi6421_spmi_pmic *pmic;
245 struct regulator_dev *rdev;
246 int i;
247
248 /*
249 * This driver is meant to be called by hi6421-spmi-core,
250 * which should first set drvdata. If this doesn't happen, hit
251 * a warn on and return.
252 */
253 pmic = dev_get_drvdata(pmic_dev);
254 if (WARN_ON(!pmic))
255 return -ENODEV;
256
257 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
258 if (!sreg)
259 return -ENOMEM;
260
261 sreg->pmic = pmic;
262 mutex_init(&sreg->enable_mutex);
263
264 for (i = 0; i < ARRAY_SIZE(regulator_info); i++) {
265 info = ®ulator_info[i];
266
267 config.dev = pdev->dev.parent;
268 config.driver_data = sreg;
269 config.regmap = pmic->regmap;
270
271 rdev = devm_regulator_register(dev, &info->desc, &config);
272 if (IS_ERR(rdev)) {
273 dev_err(dev, "failed to register %s\n",
274 info->desc.name);
275 return PTR_ERR(rdev);
276 }
277 }
278
279 return 0;
280 }
281
282 static const struct platform_device_id hi6421_spmi_regulator_table[] = {
283 { .name = "hi6421v600-regulator" },
284 {},
285 };
286 MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);
287
288 static struct platform_driver hi6421_spmi_regulator_driver = {
289 .id_table = hi6421_spmi_regulator_table,
290 .driver = {
291 .name = "hi6421v600-regulator",
292 },
293 .probe = hi6421_spmi_regulator_probe,
294 };
295 module_platform_driver(hi6421_spmi_regulator_driver);
296
297 MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
298 MODULE_LICENSE("GPL v2");
299
300