1 // SPDX-License-Identifier: GPL-2.0+
2
3 #include <linux/bits.h>
4 #include <linux/kernel.h>
5 #include <linux/module.h>
6 #include <linux/of.h>
7 #include <linux/platform_device.h>
8 #include <linux/regmap.h>
9 #include <linux/regulator/driver.h>
10 #include <linux/regulator/machine.h>
11 #include <linux/regulator/of_regulator.h>
12
13 #define RT5120_REG_PGSTAT 0x03
14 #define RT5120_REG_CH1VID 0x06
15 #define RT5120_REG_CH1SLPVID 0x07
16 #define RT5120_REG_ENABLE 0x08
17 #define RT5120_REG_MODECTL 0x09
18 #define RT5120_REG_UVOVPROT 0x0A
19 #define RT5120_REG_SLPCTL 0x0C
20 #define RT5120_REG_INTSTAT 0x1E
21 #define RT5120_REG_DISCHG 0x1F
22
23 #define RT5120_OUTPG_MASK(rid) BIT(rid + 1)
24 #define RT5120_OUTUV_MASK(rid) BIT(rid + 9)
25 #define RT5120_OUTOV_MASK(rid) BIT(rid + 16)
26 #define RT5120_CH1VID_MASK GENMASK(6, 0)
27 #define RT5120_RIDEN_MASK(rid) BIT(rid + 1)
28 #define RT5120_RADEN_MASK(rid) BIT(rid)
29 #define RT5120_FPWM_MASK(rid) BIT(rid + 1)
30 #define RT5120_UVHICCUP_MASK BIT(1)
31 #define RT5120_OVHICCUP_MASK BIT(0)
32 #define RT5120_HOTDIE_MASK BIT(1)
33
34 #define RT5120_BUCK1_MINUV 600000
35 #define RT5120_BUCK1_MAXUV 1393750
36 #define RT5120_BUCK1_STEPUV 6250
37 #define RT5120_BUCK1_NUM_VOLT 0x80
38
39 #define RT5120_AUTO_MODE 0
40 #define RT5120_FPWM_MODE 1
41
42 enum {
43 RT5120_REGULATOR_BUCK1 = 0,
44 RT5120_REGULATOR_BUCK2,
45 RT5120_REGULATOR_BUCK3,
46 RT5120_REGULATOR_BUCK4,
47 RT5120_REGULATOR_LDO,
48 RT5120_REGULATOR_EXTEN,
49 RT5120_MAX_REGULATOR
50 };
51
52 struct rt5120_priv {
53 struct device *dev;
54 struct regmap *regmap;
55 struct regulator_desc rdesc[RT5120_MAX_REGULATOR];
56 };
57
rt5120_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)58 static int rt5120_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
59 {
60 struct regmap *regmap = rdev_get_regmap(rdev);
61 int rid = rdev_get_id(rdev);
62 unsigned int mask = RT5120_FPWM_MASK(rid), val;
63
64 switch (mode) {
65 case REGULATOR_MODE_NORMAL:
66 val = 0;
67 break;
68 case REGULATOR_MODE_FAST:
69 val = RT5120_FPWM_MASK(rid);
70 break;
71 default:
72 return -EINVAL;
73 }
74
75 return regmap_update_bits(regmap, RT5120_REG_MODECTL, mask, val);
76 }
77
rt5120_buck_get_mode(struct regulator_dev * rdev)78 static unsigned int rt5120_buck_get_mode(struct regulator_dev *rdev)
79 {
80 struct regmap *regmap = rdev_get_regmap(rdev);
81 int ret, rid = rdev_get_id(rdev);
82 unsigned int val;
83
84 ret = regmap_read(regmap, RT5120_REG_MODECTL, &val);
85 if (ret)
86 return REGULATOR_MODE_INVALID;
87
88 if (val & RT5120_FPWM_MASK(rid))
89 return REGULATOR_MODE_FAST;
90
91 return REGULATOR_MODE_NORMAL;
92 }
93
rt5120_regulator_get_error_flags(struct regulator_dev * rdev,unsigned int * flags)94 static int rt5120_regulator_get_error_flags(struct regulator_dev *rdev,
95 unsigned int *flags)
96 {
97 struct regmap *regmap = rdev_get_regmap(rdev);
98 unsigned int stat, hd_stat, cur_flags = 0;
99 int rid = rdev_get_id(rdev), ret;
100
101 /*
102 * reg 0x03/0x04/0x05 to indicate PG/UV/OV
103 * use block read to descrease I/O xfer time
104 */
105 ret = regmap_raw_read(regmap, RT5120_REG_PGSTAT, &stat, 3);
106 if (ret)
107 return ret;
108
109 ret = regmap_read(regmap, RT5120_REG_INTSTAT, &hd_stat);
110 if (ret)
111 return ret;
112
113 if (!(stat & RT5120_OUTPG_MASK(rid))) {
114 if (stat & RT5120_OUTUV_MASK(rid))
115 cur_flags |= REGULATOR_ERROR_UNDER_VOLTAGE;
116
117 if (stat & RT5120_OUTOV_MASK(rid))
118 cur_flags |= REGULATOR_ERROR_REGULATION_OUT;
119 }
120
121 if (hd_stat & RT5120_HOTDIE_MASK)
122 cur_flags |= REGULATOR_ERROR_OVER_TEMP;
123
124 *flags = cur_flags;
125 return 0;
126 }
127
rt5120_buck1_set_suspend_voltage(struct regulator_dev * rdev,int uV)128 static int rt5120_buck1_set_suspend_voltage(struct regulator_dev *rdev, int uV)
129 {
130 struct regmap *regmap = rdev_get_regmap(rdev);
131 int sel;
132
133 if (uV < RT5120_BUCK1_MINUV || uV > RT5120_BUCK1_MAXUV)
134 return -EINVAL;
135
136 sel = (uV - RT5120_BUCK1_MINUV) / RT5120_BUCK1_STEPUV;
137 return regmap_write(regmap, RT5120_REG_CH1SLPVID, sel);
138 }
139
rt5120_regulator_set_suspend_enable(struct regulator_dev * rdev)140 static int rt5120_regulator_set_suspend_enable(struct regulator_dev *rdev)
141 {
142 struct regmap *regmap = rdev_get_regmap(rdev);
143 int rid = rdev_get_id(rdev);
144 unsigned int mask = RT5120_RIDEN_MASK(rid);
145
146 return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, mask);
147 }
148
rt5120_regulator_set_suspend_disable(struct regulator_dev * rdev)149 static int rt5120_regulator_set_suspend_disable(struct regulator_dev *rdev)
150 {
151 struct regmap *regmap = rdev_get_regmap(rdev);
152 int rid = rdev_get_id(rdev);
153 unsigned int mask = RT5120_RIDEN_MASK(rid);
154
155 return regmap_update_bits(regmap, RT5120_REG_SLPCTL, mask, 0);
156 }
157
158 static const struct regulator_ops rt5120_buck1_ops = {
159 .enable = regulator_enable_regmap,
160 .disable = regulator_disable_regmap,
161 .is_enabled = regulator_is_enabled_regmap,
162 .list_voltage = regulator_list_voltage_linear,
163 .set_voltage_sel = regulator_set_voltage_sel_regmap,
164 .get_voltage_sel = regulator_get_voltage_sel_regmap,
165 .set_active_discharge = regulator_set_active_discharge_regmap,
166 .set_mode = rt5120_buck_set_mode,
167 .get_mode = rt5120_buck_get_mode,
168 .get_error_flags = rt5120_regulator_get_error_flags,
169 .set_suspend_voltage = rt5120_buck1_set_suspend_voltage,
170 .set_suspend_enable = rt5120_regulator_set_suspend_enable,
171 .set_suspend_disable = rt5120_regulator_set_suspend_disable,
172 };
173
174 static const struct regulator_ops rt5120_buck234_ops = {
175 .enable = regulator_enable_regmap,
176 .disable = regulator_disable_regmap,
177 .is_enabled = regulator_is_enabled_regmap,
178 .set_active_discharge = regulator_set_active_discharge_regmap,
179 .set_mode = rt5120_buck_set_mode,
180 .get_mode = rt5120_buck_get_mode,
181 .get_error_flags = rt5120_regulator_get_error_flags,
182 .set_suspend_enable = rt5120_regulator_set_suspend_enable,
183 .set_suspend_disable = rt5120_regulator_set_suspend_disable,
184 };
185
186 static const struct regulator_ops rt5120_ldo_ops = {
187 .enable = regulator_enable_regmap,
188 .disable = regulator_disable_regmap,
189 .is_enabled = regulator_is_enabled_regmap,
190 .set_active_discharge = regulator_set_active_discharge_regmap,
191 .get_error_flags = rt5120_regulator_get_error_flags,
192 .set_suspend_enable = rt5120_regulator_set_suspend_enable,
193 .set_suspend_disable = rt5120_regulator_set_suspend_disable,
194 };
195
196 static const struct regulator_ops rt5120_exten_ops = {
197 .enable = regulator_enable_regmap,
198 .disable = regulator_disable_regmap,
199 .is_enabled = regulator_is_enabled_regmap,
200 .set_suspend_enable = rt5120_regulator_set_suspend_enable,
201 .set_suspend_disable = rt5120_regulator_set_suspend_disable,
202 };
203
rt5120_buck_of_map_mode(unsigned int mode)204 static unsigned int rt5120_buck_of_map_mode(unsigned int mode)
205 {
206 switch (mode) {
207 case RT5120_AUTO_MODE:
208 return REGULATOR_MODE_NORMAL;
209 case RT5120_FPWM_MODE:
210 return REGULATOR_MODE_FAST;
211 default:
212 return REGULATOR_MODE_INVALID;
213 }
214 }
215
rt5120_fillin_regulator_desc(struct regulator_desc * desc,int rid)216 static void rt5120_fillin_regulator_desc(struct regulator_desc *desc, int rid)
217 {
218 static const char * const name[] = {
219 "buck1", "buck2", "buck3", "buck4", "ldo", "exten" };
220 static const char * const sname[] = {
221 "vin1", "vin2", "vin3", "vin4", "vinldo", NULL };
222
223 /* Common regulator property */
224 desc->name = name[rid];
225 desc->supply_name = sname[rid];
226 desc->owner = THIS_MODULE;
227 desc->type = REGULATOR_VOLTAGE;
228 desc->id = rid;
229 desc->enable_reg = RT5120_REG_ENABLE;
230 desc->enable_mask = RT5120_RIDEN_MASK(rid);
231 desc->active_discharge_reg = RT5120_REG_DISCHG;
232 desc->active_discharge_mask = RT5120_RADEN_MASK(rid);
233 desc->active_discharge_on = RT5120_RADEN_MASK(rid);
234 /* Config n_voltages to 1 for all*/
235 desc->n_voltages = 1;
236
237 /* Only buck support mode change */
238 if (rid >= RT5120_REGULATOR_BUCK1 && rid <= RT5120_REGULATOR_BUCK4)
239 desc->of_map_mode = rt5120_buck_of_map_mode;
240
241 /* RID specific property init */
242 switch (rid) {
243 case RT5120_REGULATOR_BUCK1:
244 /* Only buck1 support voltage change by I2C */
245 desc->n_voltages = RT5120_BUCK1_NUM_VOLT;
246 desc->min_uV = RT5120_BUCK1_MINUV;
247 desc->uV_step = RT5120_BUCK1_STEPUV;
248 desc->vsel_reg = RT5120_REG_CH1VID,
249 desc->vsel_mask = RT5120_CH1VID_MASK,
250 desc->ops = &rt5120_buck1_ops;
251 break;
252 case RT5120_REGULATOR_BUCK2 ... RT5120_REGULATOR_BUCK4:
253 desc->ops = &rt5120_buck234_ops;
254 break;
255 case RT5120_REGULATOR_LDO:
256 desc->ops = &rt5120_ldo_ops;
257 break;
258 default:
259 desc->ops = &rt5120_exten_ops;
260 }
261 }
262
rt5120_of_parse_cb(struct rt5120_priv * priv,int rid,struct of_regulator_match * match)263 static int rt5120_of_parse_cb(struct rt5120_priv *priv, int rid,
264 struct of_regulator_match *match)
265 {
266 struct regulator_desc *desc = priv->rdesc + rid;
267 struct regulator_init_data *init_data = match->init_data;
268
269 if (!init_data || rid == RT5120_REGULATOR_BUCK1)
270 return 0;
271
272 if (init_data->constraints.min_uV != init_data->constraints.max_uV) {
273 dev_err(priv->dev, "Variable voltage for fixed regulator\n");
274 return -EINVAL;
275 }
276
277 desc->fixed_uV = init_data->constraints.min_uV;
278 return 0;
279 }
280
281 static struct of_regulator_match rt5120_regu_match[RT5120_MAX_REGULATOR] = {
282 [RT5120_REGULATOR_BUCK1] = { .name = "buck1", },
283 [RT5120_REGULATOR_BUCK2] = { .name = "buck2", },
284 [RT5120_REGULATOR_BUCK3] = { .name = "buck3", },
285 [RT5120_REGULATOR_BUCK4] = { .name = "buck4", },
286 [RT5120_REGULATOR_LDO] = { .name = "ldo", },
287 [RT5120_REGULATOR_EXTEN] = { .name = "exten", }
288 };
289
rt5120_parse_regulator_dt_data(struct rt5120_priv * priv)290 static int rt5120_parse_regulator_dt_data(struct rt5120_priv *priv)
291 {
292 struct device *dev = priv->dev->parent;
293 struct device_node *reg_node;
294 int i, ret;
295
296 for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
297 rt5120_fillin_regulator_desc(priv->rdesc + i, i);
298
299 rt5120_regu_match[i].desc = priv->rdesc + i;
300 }
301
302 reg_node = of_get_child_by_name(dev->of_node, "regulators");
303 if (!reg_node) {
304 dev_err(priv->dev, "Couldn't find 'regulators' node\n");
305 return -ENODEV;
306 }
307
308 ret = of_regulator_match(priv->dev, reg_node, rt5120_regu_match,
309 ARRAY_SIZE(rt5120_regu_match));
310
311 of_node_put(reg_node);
312
313 if (ret < 0) {
314 dev_err(priv->dev,
315 "Error parsing regulator init data (%d)\n", ret);
316 return ret;
317 }
318
319 for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
320 ret = rt5120_of_parse_cb(priv, i, rt5120_regu_match + i);
321 if (ret) {
322 dev_err(priv->dev, "Failed in [%d] of_passe_cb\n", i);
323 return ret;
324 }
325 }
326
327 return 0;
328 }
329
rt5120_device_property_init(struct rt5120_priv * priv)330 static int rt5120_device_property_init(struct rt5120_priv *priv)
331 {
332 struct device *dev = priv->dev->parent;
333 struct device_node *np = dev->of_node;
334 bool prot_enable;
335 unsigned int prot_enable_val = 0;
336
337 /* Assign UV/OV HW protection behavior */
338 prot_enable = of_property_read_bool(np,
339 "richtek,enable-undervolt-hiccup");
340 if (prot_enable)
341 prot_enable_val |= RT5120_UVHICCUP_MASK;
342
343 prot_enable = of_property_read_bool(np,
344 "richtek,enable-overvolt-hiccup");
345 if (prot_enable)
346 prot_enable_val |= RT5120_OVHICCUP_MASK;
347
348 return regmap_update_bits(priv->regmap, RT5120_REG_UVOVPROT,
349 RT5120_UVHICCUP_MASK | RT5120_OVHICCUP_MASK,
350 prot_enable_val);
351 }
352
rt5120_regulator_probe(struct platform_device * pdev)353 static int rt5120_regulator_probe(struct platform_device *pdev)
354 {
355 struct rt5120_priv *priv;
356 struct regulator_dev *rdev;
357 struct regulator_config config = {};
358 int i, ret;
359
360 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
361 if (!priv)
362 return -ENOMEM;
363
364 priv->dev = &pdev->dev;
365
366 priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
367 if (!priv->regmap) {
368 dev_err(&pdev->dev, "Failed to init regmap\n");
369 return -ENODEV;
370 }
371
372 ret = rt5120_device_property_init(priv);
373 if (ret) {
374 dev_err(&pdev->dev, "Failed to do property init\n");
375 return ret;
376 }
377
378 ret = rt5120_parse_regulator_dt_data(priv);
379 if (ret) {
380 dev_err(&pdev->dev, "Failed to parse dt data\n");
381 return ret;
382 }
383
384 config.dev = &pdev->dev;
385 config.regmap = priv->regmap;
386
387 for (i = 0; i < RT5120_MAX_REGULATOR; i++) {
388 config.of_node = rt5120_regu_match[i].of_node;
389 config.init_data = rt5120_regu_match[i].init_data;
390
391 rdev = devm_regulator_register(&pdev->dev, priv->rdesc + i,
392 &config);
393 if (IS_ERR(rdev)) {
394 dev_err(&pdev->dev,
395 "Failed to register regulator [%d]\n", i);
396 return PTR_ERR(rdev);
397 }
398 }
399
400 return 0;
401 }
402
403 static const struct platform_device_id rt5120_regulator_dev_table[] = {
404 { "rt5120-regulator", 0 },
405 {}
406 };
407 MODULE_DEVICE_TABLE(platform, rt5120_regulator_dev_table);
408
409 static struct platform_driver rt5120_regulator_driver = {
410 .driver = {
411 .name = "rt5120-regulator",
412 },
413 .id_table = rt5120_regulator_dev_table,
414 .probe = rt5120_regulator_probe,
415 };
416 module_platform_driver(rt5120_regulator_driver);
417
418 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
419 MODULE_DESCRIPTION("Richtek RT5120 regulator driver");
420 MODULE_LICENSE("GPL v2");
421
