1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ROHM BD9571MWV-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/module.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/regulator/driver.h>
16
17#include <linux/mfd/bd9571mwv.h>
18
19struct bd9571mwv_reg {
20 struct bd9571mwv *bd;
21
22 /* DDR Backup Power */
23 u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
24 u8 bkup_mode_cnt_saved;
25 bool bkup_mode_enabled;
26
27 /* Power switch type */
28 bool rstbmode_level;
29 bool rstbmode_pulse;
30};
31
32enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };
33
34#define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
35 { \
36 .name = _name, \
37 .of_match = of_match_ptr(_of), \
38 .regulators_node = "regulators", \
39 .id = _id, \
40 .ops = &_ops, \
41 .n_voltages = _nv, \
42 .type = REGULATOR_VOLTAGE, \
43 .owner = THIS_MODULE, \
44 .vsel_reg = _vr, \
45 .vsel_mask = _vm, \
46 .min_uV = _min, \
47 .uV_step = _step, \
48 .linear_min_sel = _lmin, \
49 }
50
51static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
52{
53 unsigned int val;
54 int ret;
55
56 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
57 if (ret != 0)
58 return ret;
59
60 return val & BD9571MWV_AVS_SET_MONI_MASK;
61}
62
63static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
64 unsigned int sel)
65{
66 int ret;
67
68 ret = bd9571mwv_avs_get_moni_state(rdev);
69 if (ret < 0)
70 return ret;
71
72 return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
73 rdev->desc->vsel_mask, sel);
74}
75
76static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
77{
78 unsigned int val;
79 int ret;
80
81 ret = bd9571mwv_avs_get_moni_state(rdev);
82 if (ret < 0)
83 return ret;
84
85 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
86 if (ret != 0)
87 return ret;
88
89 val &= rdev->desc->vsel_mask;
90 val >>= ffs(rdev->desc->vsel_mask) - 1;
91
92 return val;
93}
94
95static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
96 unsigned int sel)
97{
98 return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
99 rdev->desc->vsel_mask, sel);
100}
101
102/* Operations permitted on AVS voltage regulator */
103static const struct regulator_ops avs_ops = {
104 .set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap,
105 .map_voltage = regulator_map_voltage_linear,
106 .get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap,
107 .list_voltage = regulator_list_voltage_linear,
108};
109
110/* Operations permitted on voltage regulators */
111static const struct regulator_ops reg_ops = {
112 .set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap,
113 .map_voltage = regulator_map_voltage_linear,
114 .get_voltage_sel = regulator_get_voltage_sel_regmap,
115 .list_voltage = regulator_list_voltage_linear,
116};
117
118/* Operations permitted on voltage monitors */
119static const struct regulator_ops vid_ops = {
120 .map_voltage = regulator_map_voltage_linear,
121 .get_voltage_sel = regulator_get_voltage_sel_regmap,
122 .list_voltage = regulator_list_voltage_linear,
123};
124
125static const struct regulator_desc regulators[] = {
126 BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
127 0x80, 600000, 10000, 0x3c),
128 BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
129 16, 1625000, 25000, 0),
130 BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
131 16, 2150000, 50000, 0),
132 BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
133 11, 2800000, 100000, 0),
134 BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
135 BD9571MWV_DVFS_MONIVDAC, 0x7f,
136 0x80, 600000, 10000, 0x3c),
137};
138
139#ifdef CONFIG_PM_SLEEP
140static int bd9571mwv_bkup_mode_read(struct bd9571mwv *bd, unsigned int *mode)
141{
142 int ret;
143
144 ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
145 if (ret) {
146 dev_err(bd->dev, "failed to read backup mode (%d)\n", ret);
147 return ret;
148 }
149
150 return 0;
151}
152
153static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
154{
155 int ret;
156
157 ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
158 if (ret) {
159 dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n",
160 mode, ret);
161 return ret;
162 }
163
164 return 0;
165}
166
167static ssize_t backup_mode_show(struct device *dev,
168 struct device_attribute *attr, char *buf)
169{
170 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
171
172 return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
173}
174
175static ssize_t backup_mode_store(struct device *dev,
176 struct device_attribute *attr,
177 const char *buf, size_t count)
178{
179 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
180 unsigned int mode;
181 int ret;
182
183 if (!count)
184 return 0;
185
186 ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
187 if (ret)
188 return ret;
189
190 if (!bdreg->rstbmode_level)
191 return count;
192
193 /*
194 * Configure DDR Backup Mode, to change the role of the accessory power
195 * switch from a power switch to a wake-up switch, or vice versa
196 */
197 ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
198 if (ret)
199 return ret;
200
201 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
202 if (bdreg->bkup_mode_enabled)
203 mode |= bdreg->bkup_mode_cnt_keepon;
204
205 ret = bd9571mwv_bkup_mode_write(bdreg->bd, mode);
206 if (ret)
207 return ret;
208
209 return count;
210}
211
212static DEVICE_ATTR_RW(backup_mode);
213
214static int bd9571mwv_suspend(struct device *dev)
215{
216 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
217 unsigned int mode;
218 int ret;
219
220 if (!bdreg->bkup_mode_enabled)
221 return 0;
222
223 /* Save DDR Backup Mode */
224 ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
225 if (ret)
226 return ret;
227
228 bdreg->bkup_mode_cnt_saved = mode;
229
230 if (!bdreg->rstbmode_pulse)
231 return 0;
232
233 /* Enable DDR Backup Mode */
234 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
235 mode |= bdreg->bkup_mode_cnt_keepon;
236
237 if (mode != bdreg->bkup_mode_cnt_saved)
238 return bd9571mwv_bkup_mode_write(bdreg->bd, mode);
239
240 return 0;
241}
242
243static int bd9571mwv_resume(struct device *dev)
244{
245 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
246
247 if (!bdreg->bkup_mode_enabled)
248 return 0;
249
250 /* Restore DDR Backup Mode */
251 return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved);
252}
253
254static const struct dev_pm_ops bd9571mwv_pm = {
255 SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
256};
257
258static int bd9571mwv_regulator_remove(struct platform_device *pdev)
259{
260 device_remove_file(&pdev->dev, &dev_attr_backup_mode);
261 return 0;
262}
263#define DEV_PM_OPS &bd9571mwv_pm
264#else
265#define DEV_PM_OPS NULL
266#define bd9571mwv_regulator_remove NULL
267#endif /* CONFIG_PM_SLEEP */
268
269static int bd9571mwv_regulator_probe(struct platform_device *pdev)
270{
271 struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent);
272 struct regulator_config config = { };
273 struct bd9571mwv_reg *bdreg;
274 struct regulator_dev *rdev;
275 unsigned int val;
276 int i;
277
278 bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
279 if (!bdreg)
280 return -ENOMEM;
281
282 bdreg->bd = bd;
283
284 platform_set_drvdata(pdev, bdreg);
285
286 config.dev = &pdev->dev;
287 config.dev->of_node = bd->dev->of_node;
288 config.driver_data = bd;
289 config.regmap = bd->regmap;
290
291 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
292 rdev = devm_regulator_register(&pdev->dev, &regulators[i],
293 &config);
294 if (IS_ERR(rdev)) {
295 dev_err(bd->dev, "failed to register %s regulator\n",
296 pdev->name);
297 return PTR_ERR(rdev);
298 }
299 }
300
301 val = 0;
302 of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val);
303 if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
304 dev_err(bd->dev, "invalid %s mode %u\n",
305 "rohm,ddr-backup-power", val);
306 return -EINVAL;
307 }
308 bdreg->bkup_mode_cnt_keepon = val;
309
310 bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node,
311 "rohm,rstbmode-level");
312 bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node,
313 "rohm,rstbmode-pulse");
314 if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
315 dev_err(bd->dev, "only one rohm,rstbmode-* may be specified");
316 return -EINVAL;
317 }
318
319#ifdef CONFIG_PM_SLEEP
320 if (bdreg->bkup_mode_cnt_keepon) {
321 int ret;
322
323 /*
324 * Backup mode is enabled by default in pulse mode, but needs
325 * explicit user setup in level mode.
326 */
327 bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;
328
329 ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
330 if (ret)
331 return ret;
332 }
333#endif /* CONFIG_PM_SLEEP */
334
335 return 0;
336}
337
338static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
339 { "bd9571mwv-regulator", },
340 { /* sentinel */ }
341};
342MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);
343
344static struct platform_driver bd9571mwv_regulator_driver = {
345 .driver = {
346 .name = "bd9571mwv-regulator",
347 .pm = DEV_PM_OPS,
348 },
349 .probe = bd9571mwv_regulator_probe,
350 .remove = bd9571mwv_regulator_remove,
351 .id_table = bd9571mwv_regulator_id_table,
352};
353module_platform_driver(bd9571mwv_regulator_driver);
354
355MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
356MODULE_DESCRIPTION("BD9571MWV Regulator driver");
357MODULE_LICENSE("GPL v2");
358