1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ROHM BD9571MWV-M and BD9574MWF-M regulator driver
4 *
5 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
6 *
7 * Based on the TPS65086 driver
8 *
9 * NOTE: VD09 is missing
10 */
11
12 #include <linux/mfd/rohm-generic.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/regulator/driver.h>
17
18 #include <linux/mfd/bd9571mwv.h>
19
20 struct bd9571mwv_reg {
21 struct regmap *regmap;
22
23 /* DDR Backup Power */
24 u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
25 u8 bkup_mode_cnt_saved;
26 bool bkup_mode_enabled;
27
28 /* Power switch type */
29 bool rstbmode_level;
30 bool rstbmode_pulse;
31 };
32
33 enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };
34
35 #define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
36 { \
37 .name = _name, \
38 .of_match = of_match_ptr(_of), \
39 .regulators_node = "regulators", \
40 .id = _id, \
41 .ops = &_ops, \
42 .n_voltages = _nv, \
43 .type = REGULATOR_VOLTAGE, \
44 .owner = THIS_MODULE, \
45 .vsel_reg = _vr, \
46 .vsel_mask = _vm, \
47 .min_uV = _min, \
48 .uV_step = _step, \
49 .linear_min_sel = _lmin, \
50 }
51
bd9571mwv_avs_get_moni_state(struct regulator_dev * rdev)52 static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
53 {
54 unsigned int val;
55 int ret;
56
57 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
58 if (ret != 0)
59 return ret;
60
61 return val & BD9571MWV_AVS_SET_MONI_MASK;
62 }
63
bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev * rdev,unsigned int sel)64 static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
65 unsigned int sel)
66 {
67 int ret;
68
69 ret = bd9571mwv_avs_get_moni_state(rdev);
70 if (ret < 0)
71 return ret;
72
73 return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
74 rdev->desc->vsel_mask, sel);
75 }
76
bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev * rdev)77 static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
78 {
79 unsigned int val;
80 int ret;
81
82 ret = bd9571mwv_avs_get_moni_state(rdev);
83 if (ret < 0)
84 return ret;
85
86 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
87 if (ret != 0)
88 return ret;
89
90 val &= rdev->desc->vsel_mask;
91 val >>= ffs(rdev->desc->vsel_mask) - 1;
92
93 return val;
94 }
95
bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev * rdev,unsigned int sel)96 static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
97 unsigned int sel)
98 {
99 return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
100 rdev->desc->vsel_mask, sel);
101 }
102
103 /* Operations permitted on AVS voltage regulator */
104 static const struct regulator_ops avs_ops = {
105 .set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap,
106 .map_voltage = regulator_map_voltage_linear,
107 .get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap,
108 .list_voltage = regulator_list_voltage_linear,
109 };
110
111 /* Operations permitted on voltage regulators */
112 static const struct regulator_ops reg_ops = {
113 .set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap,
114 .map_voltage = regulator_map_voltage_linear,
115 .get_voltage_sel = regulator_get_voltage_sel_regmap,
116 .list_voltage = regulator_list_voltage_linear,
117 };
118
119 /* Operations permitted on voltage monitors */
120 static const struct regulator_ops vid_ops = {
121 .map_voltage = regulator_map_voltage_linear,
122 .get_voltage_sel = regulator_get_voltage_sel_regmap,
123 .list_voltage = regulator_list_voltage_linear,
124 };
125
126 static const struct regulator_desc regulators[] = {
127 BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
128 0x6f, 600000, 10000, 0x3c),
129 BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
130 16, 1625000, 25000, 0),
131 BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
132 16, 2150000, 50000, 0),
133 BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
134 11, 2800000, 100000, 0),
135 BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
136 BD9571MWV_DVFS_MONIVDAC, 0x7f,
137 0x6f, 600000, 10000, 0x3c),
138 };
139
140 #ifdef CONFIG_PM_SLEEP
bd9571mwv_bkup_mode_read(struct bd9571mwv_reg * bdreg,unsigned int * mode)141 static int bd9571mwv_bkup_mode_read(struct bd9571mwv_reg *bdreg,
142 unsigned int *mode)
143 {
144 int ret;
145
146 ret = regmap_read(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
147 if (ret) {
148 dev_err(regmap_get_device(bdreg->regmap),
149 "failed to read backup mode (%d)\n", ret);
150 return ret;
151 }
152
153 return 0;
154 }
155
bd9571mwv_bkup_mode_write(struct bd9571mwv_reg * bdreg,unsigned int mode)156 static int bd9571mwv_bkup_mode_write(struct bd9571mwv_reg *bdreg,
157 unsigned int mode)
158 {
159 int ret;
160
161 ret = regmap_write(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
162 if (ret) {
163 dev_err(regmap_get_device(bdreg->regmap),
164 "failed to configure backup mode 0x%x (%d)\n",
165 mode, ret);
166 return ret;
167 }
168
169 return 0;
170 }
171
backup_mode_show(struct device * dev,struct device_attribute * attr,char * buf)172 static ssize_t backup_mode_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
174 {
175 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
176
177 return sysfs_emit(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
178 }
179
backup_mode_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)180 static ssize_t backup_mode_store(struct device *dev,
181 struct device_attribute *attr,
182 const char *buf, size_t count)
183 {
184 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
185 unsigned int mode;
186 int ret;
187
188 if (!count)
189 return 0;
190
191 ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
192 if (ret)
193 return ret;
194
195 if (!bdreg->rstbmode_level)
196 return count;
197
198 /*
199 * Configure DDR Backup Mode, to change the role of the accessory power
200 * switch from a power switch to a wake-up switch, or vice versa
201 */
202 ret = bd9571mwv_bkup_mode_read(bdreg, &mode);
203 if (ret)
204 return ret;
205
206 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
207 if (bdreg->bkup_mode_enabled)
208 mode |= bdreg->bkup_mode_cnt_keepon;
209
210 ret = bd9571mwv_bkup_mode_write(bdreg, mode);
211 if (ret)
212 return ret;
213
214 return count;
215 }
216
217 static DEVICE_ATTR_RW(backup_mode);
218
bd9571mwv_suspend(struct device * dev)219 static int bd9571mwv_suspend(struct device *dev)
220 {
221 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
222 unsigned int mode;
223 int ret;
224
225 if (!bdreg->bkup_mode_enabled)
226 return 0;
227
228 /* Save DDR Backup Mode */
229 ret = bd9571mwv_bkup_mode_read(bdreg, &mode);
230 if (ret)
231 return ret;
232
233 bdreg->bkup_mode_cnt_saved = mode;
234
235 if (!bdreg->rstbmode_pulse)
236 return 0;
237
238 /* Enable DDR Backup Mode */
239 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
240 mode |= bdreg->bkup_mode_cnt_keepon;
241
242 if (mode != bdreg->bkup_mode_cnt_saved)
243 return bd9571mwv_bkup_mode_write(bdreg, mode);
244
245 return 0;
246 }
247
bd9571mwv_resume(struct device * dev)248 static int bd9571mwv_resume(struct device *dev)
249 {
250 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
251
252 if (!bdreg->bkup_mode_enabled)
253 return 0;
254
255 /* Restore DDR Backup Mode */
256 return bd9571mwv_bkup_mode_write(bdreg, bdreg->bkup_mode_cnt_saved);
257 }
258
259 static const struct dev_pm_ops bd9571mwv_pm = {
260 SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
261 };
262
bd9571mwv_regulator_remove(struct platform_device * pdev)263 static void bd9571mwv_regulator_remove(struct platform_device *pdev)
264 {
265 device_remove_file(&pdev->dev, &dev_attr_backup_mode);
266 }
267 #define DEV_PM_OPS &bd9571mwv_pm
268 #else
269 #define DEV_PM_OPS NULL
270 #define bd9571mwv_regulator_remove NULL
271 #endif /* CONFIG_PM_SLEEP */
272
bd9571mwv_regulator_probe(struct platform_device * pdev)273 static int bd9571mwv_regulator_probe(struct platform_device *pdev)
274 {
275 struct regulator_config config = { };
276 struct bd9571mwv_reg *bdreg;
277 struct regulator_dev *rdev;
278 unsigned int val;
279 int i;
280 enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
281
282 bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
283 if (!bdreg)
284 return -ENOMEM;
285
286 bdreg->regmap = dev_get_regmap(pdev->dev.parent, NULL);
287
288 platform_set_drvdata(pdev, bdreg);
289
290 config.dev = &pdev->dev;
291 config.dev->of_node = pdev->dev.parent->of_node;
292 config.driver_data = bdreg;
293 config.regmap = bdreg->regmap;
294
295 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
296 /* BD9574MWF supports DVFS only */
297 if (chip == ROHM_CHIP_TYPE_BD9574 && regulators[i].id != DVFS)
298 continue;
299 rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
300 &config);
301 if (IS_ERR(rdev)) {
302 dev_err(&pdev->dev, "failed to register %s regulator\n",
303 regulators[i].name);
304 return PTR_ERR(rdev);
305 }
306 }
307
308 val = 0;
309 of_property_read_u32(config.dev->of_node, "rohm,ddr-backup-power", &val);
310 if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
311 dev_err(&pdev->dev, "invalid %s mode %u\n",
312 "rohm,ddr-backup-power", val);
313 return -EINVAL;
314 }
315 bdreg->bkup_mode_cnt_keepon = val;
316
317 bdreg->rstbmode_level = of_property_read_bool(config.dev->of_node,
318 "rohm,rstbmode-level");
319 bdreg->rstbmode_pulse = of_property_read_bool(config.dev->of_node,
320 "rohm,rstbmode-pulse");
321 if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
322 dev_err(&pdev->dev, "only one rohm,rstbmode-* may be specified");
323 return -EINVAL;
324 }
325
326 #ifdef CONFIG_PM_SLEEP
327 if (bdreg->bkup_mode_cnt_keepon) {
328 int ret;
329
330 /*
331 * Backup mode is enabled by default in pulse mode, but needs
332 * explicit user setup in level mode.
333 */
334 bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;
335
336 ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
337 if (ret)
338 return ret;
339 }
340 #endif /* CONFIG_PM_SLEEP */
341
342 return 0;
343 }
344
345 static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
346 { "bd9571mwv-regulator", ROHM_CHIP_TYPE_BD9571 },
347 { "bd9574mwf-regulator", ROHM_CHIP_TYPE_BD9574 },
348 { /* sentinel */ }
349 };
350 MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);
351
352 static struct platform_driver bd9571mwv_regulator_driver = {
353 .driver = {
354 .name = "bd9571mwv-regulator",
355 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
356 .pm = DEV_PM_OPS,
357 },
358 .probe = bd9571mwv_regulator_probe,
359 .remove_new = bd9571mwv_regulator_remove,
360 .id_table = bd9571mwv_regulator_id_table,
361 };
362 module_platform_driver(bd9571mwv_regulator_driver);
363
364 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
365 MODULE_DESCRIPTION("BD9571MWV Regulator driver");
366 MODULE_LICENSE("GPL v2");
367