virtio-mem: don't read big block size in Sub Block Mode
[linux-2.6-microblaze.git] / drivers / regulator / tps6507x-regulator.c
1 /*
2  * tps6507x-regulator.c
3  *
4  * Regulator driver for TPS65073 PMIC
5  *
6  * Copyright (C) 2009 Texas Instrument Incorporated - https://www.ti.com/
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation version 2.
11  *
12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
13  * whether express or implied; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/err.h>
22 #include <linux/platform_device.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/machine.h>
25 #include <linux/regulator/tps6507x.h>
26 #include <linux/of.h>
27 #include <linux/slab.h>
28 #include <linux/mfd/tps6507x.h>
29 #include <linux/regulator/of_regulator.h>
30
31 /* DCDC's */
32 #define TPS6507X_DCDC_1                         0
33 #define TPS6507X_DCDC_2                         1
34 #define TPS6507X_DCDC_3                         2
35 /* LDOs */
36 #define TPS6507X_LDO_1                          3
37 #define TPS6507X_LDO_2                          4
38
39 #define TPS6507X_MAX_REG_ID                     TPS6507X_LDO_2
40
41 /* Number of step-down converters available */
42 #define TPS6507X_NUM_DCDC                       3
43 /* Number of LDO voltage regulators  available */
44 #define TPS6507X_NUM_LDO                        2
45 /* Number of total regulators available */
46 #define TPS6507X_NUM_REGULATOR          (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
47
48 /* Supported voltage values for regulators (in microVolts) */
49 static const unsigned int VDCDCx_VSEL_table[] = {
50         725000, 750000, 775000, 800000,
51         825000, 850000, 875000, 900000,
52         925000, 950000, 975000, 1000000,
53         1025000, 1050000, 1075000, 1100000,
54         1125000, 1150000, 1175000, 1200000,
55         1225000, 1250000, 1275000, 1300000,
56         1325000, 1350000, 1375000, 1400000,
57         1425000, 1450000, 1475000, 1500000,
58         1550000, 1600000, 1650000, 1700000,
59         1750000, 1800000, 1850000, 1900000,
60         1950000, 2000000, 2050000, 2100000,
61         2150000, 2200000, 2250000, 2300000,
62         2350000, 2400000, 2450000, 2500000,
63         2550000, 2600000, 2650000, 2700000,
64         2750000, 2800000, 2850000, 2900000,
65         3000000, 3100000, 3200000, 3300000,
66 };
67
68 static const unsigned int LDO1_VSEL_table[] = {
69         1000000, 1100000, 1200000, 1250000,
70         1300000, 1350000, 1400000, 1500000,
71         1600000, 1800000, 2500000, 2750000,
72         2800000, 3000000, 3100000, 3300000,
73 };
74
75 /* The voltage mapping table for LDO2 is the same as VDCDCx */
76 #define LDO2_VSEL_table VDCDCx_VSEL_table
77
78 struct tps_info {
79         const char *name;
80         u8 table_len;
81         const unsigned int *table;
82
83         /* Does DCDC high or the low register defines output voltage? */
84         bool defdcdc_default;
85 };
86
87 static struct tps_info tps6507x_pmic_regs[] = {
88         {
89                 .name = "VDCDC1",
90                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
91                 .table = VDCDCx_VSEL_table,
92         },
93         {
94                 .name = "VDCDC2",
95                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
96                 .table = VDCDCx_VSEL_table,
97         },
98         {
99                 .name = "VDCDC3",
100                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
101                 .table = VDCDCx_VSEL_table,
102         },
103         {
104                 .name = "LDO1",
105                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
106                 .table = LDO1_VSEL_table,
107         },
108         {
109                 .name = "LDO2",
110                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
111                 .table = LDO2_VSEL_table,
112         },
113 };
114
115 struct tps6507x_pmic {
116         struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
117         struct tps6507x_dev *mfd;
118         struct tps_info *info[TPS6507X_NUM_REGULATOR];
119         struct mutex io_lock;
120 };
121 static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
122 {
123         u8 val;
124         int err;
125
126         err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
127
128         if (err)
129                 return err;
130
131         return val;
132 }
133
134 static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
135 {
136         return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
137 }
138
139 static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
140 {
141         int err, data;
142
143         mutex_lock(&tps->io_lock);
144
145         data = tps6507x_pmic_read(tps, reg);
146         if (data < 0) {
147                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
148                 err = data;
149                 goto out;
150         }
151
152         data |= mask;
153         err = tps6507x_pmic_write(tps, reg, data);
154         if (err)
155                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
156
157 out:
158         mutex_unlock(&tps->io_lock);
159         return err;
160 }
161
162 static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
163 {
164         int err, data;
165
166         mutex_lock(&tps->io_lock);
167
168         data = tps6507x_pmic_read(tps, reg);
169         if (data < 0) {
170                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
171                 err = data;
172                 goto out;
173         }
174
175         data &= ~mask;
176         err = tps6507x_pmic_write(tps, reg, data);
177         if (err)
178                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
179
180 out:
181         mutex_unlock(&tps->io_lock);
182         return err;
183 }
184
185 static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
186 {
187         int data;
188
189         mutex_lock(&tps->io_lock);
190
191         data = tps6507x_pmic_read(tps, reg);
192         if (data < 0)
193                 dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
194
195         mutex_unlock(&tps->io_lock);
196         return data;
197 }
198
199 static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
200 {
201         int err;
202
203         mutex_lock(&tps->io_lock);
204
205         err = tps6507x_pmic_write(tps, reg, val);
206         if (err < 0)
207                 dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
208
209         mutex_unlock(&tps->io_lock);
210         return err;
211 }
212
213 static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
214 {
215         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
216         int data, rid = rdev_get_id(dev);
217         u8 shift;
218
219         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
220                 return -EINVAL;
221
222         shift = TPS6507X_MAX_REG_ID - rid;
223         data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
224
225         if (data < 0)
226                 return data;
227         else
228                 return (data & 1<<shift) ? 1 : 0;
229 }
230
231 static int tps6507x_pmic_enable(struct regulator_dev *dev)
232 {
233         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
234         int rid = rdev_get_id(dev);
235         u8 shift;
236
237         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
238                 return -EINVAL;
239
240         shift = TPS6507X_MAX_REG_ID - rid;
241         return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
242 }
243
244 static int tps6507x_pmic_disable(struct regulator_dev *dev)
245 {
246         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
247         int rid = rdev_get_id(dev);
248         u8 shift;
249
250         if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
251                 return -EINVAL;
252
253         shift = TPS6507X_MAX_REG_ID - rid;
254         return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
255                                         1 << shift);
256 }
257
258 static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
259 {
260         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
261         int data, rid = rdev_get_id(dev);
262         u8 reg, mask;
263
264         switch (rid) {
265         case TPS6507X_DCDC_1:
266                 reg = TPS6507X_REG_DEFDCDC1;
267                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
268                 break;
269         case TPS6507X_DCDC_2:
270                 if (tps->info[rid]->defdcdc_default)
271                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
272                 else
273                         reg = TPS6507X_REG_DEFDCDC2_LOW;
274                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
275                 break;
276         case TPS6507X_DCDC_3:
277                 if (tps->info[rid]->defdcdc_default)
278                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
279                 else
280                         reg = TPS6507X_REG_DEFDCDC3_LOW;
281                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
282                 break;
283         case TPS6507X_LDO_1:
284                 reg = TPS6507X_REG_LDO_CTRL1;
285                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
286                 break;
287         case TPS6507X_LDO_2:
288                 reg = TPS6507X_REG_DEFLDO2;
289                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
290                 break;
291         default:
292                 return -EINVAL;
293         }
294
295         data = tps6507x_pmic_reg_read(tps, reg);
296         if (data < 0)
297                 return data;
298
299         data &= mask;
300         return data;
301 }
302
303 static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
304                                           unsigned selector)
305 {
306         struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
307         int data, rid = rdev_get_id(dev);
308         u8 reg, mask;
309
310         switch (rid) {
311         case TPS6507X_DCDC_1:
312                 reg = TPS6507X_REG_DEFDCDC1;
313                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
314                 break;
315         case TPS6507X_DCDC_2:
316                 if (tps->info[rid]->defdcdc_default)
317                         reg = TPS6507X_REG_DEFDCDC2_HIGH;
318                 else
319                         reg = TPS6507X_REG_DEFDCDC2_LOW;
320                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
321                 break;
322         case TPS6507X_DCDC_3:
323                 if (tps->info[rid]->defdcdc_default)
324                         reg = TPS6507X_REG_DEFDCDC3_HIGH;
325                 else
326                         reg = TPS6507X_REG_DEFDCDC3_LOW;
327                 mask = TPS6507X_DEFDCDCX_DCDC_MASK;
328                 break;
329         case TPS6507X_LDO_1:
330                 reg = TPS6507X_REG_LDO_CTRL1;
331                 mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
332                 break;
333         case TPS6507X_LDO_2:
334                 reg = TPS6507X_REG_DEFLDO2;
335                 mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
336                 break;
337         default:
338                 return -EINVAL;
339         }
340
341         data = tps6507x_pmic_reg_read(tps, reg);
342         if (data < 0)
343                 return data;
344
345         data &= ~mask;
346         data |= selector;
347
348         return tps6507x_pmic_reg_write(tps, reg, data);
349 }
350
351 static const struct regulator_ops tps6507x_pmic_ops = {
352         .is_enabled = tps6507x_pmic_is_enabled,
353         .enable = tps6507x_pmic_enable,
354         .disable = tps6507x_pmic_disable,
355         .get_voltage_sel = tps6507x_pmic_get_voltage_sel,
356         .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
357         .list_voltage = regulator_list_voltage_table,
358         .map_voltage = regulator_map_voltage_ascend,
359 };
360
361 static int tps6507x_pmic_of_parse_cb(struct device_node *np,
362                                      const struct regulator_desc *desc,
363                                      struct regulator_config *config)
364 {
365         struct tps6507x_pmic *tps = config->driver_data;
366         struct tps_info *info = tps->info[desc->id];
367         u32 prop;
368         int ret;
369
370         ret = of_property_read_u32(np, "ti,defdcdc_default", &prop);
371         if (!ret)
372                 info->defdcdc_default = prop;
373
374         return 0;
375 }
376
377 static int tps6507x_pmic_probe(struct platform_device *pdev)
378 {
379         struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
380         struct tps_info *info = &tps6507x_pmic_regs[0];
381         struct regulator_config config = { };
382         struct regulator_init_data *init_data = NULL;
383         struct regulator_dev *rdev;
384         struct tps6507x_pmic *tps;
385         struct tps6507x_board *tps_board;
386         int i;
387
388         /**
389          * tps_board points to pmic related constants
390          * coming from the board-evm file.
391          */
392
393         tps_board = dev_get_platdata(tps6507x_dev->dev);
394         if (tps_board)
395                 init_data = tps_board->tps6507x_pmic_init_data;
396
397         tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
398         if (!tps)
399                 return -ENOMEM;
400
401         mutex_init(&tps->io_lock);
402
403         /* common for all regulators */
404         tps->mfd = tps6507x_dev;
405
406         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++) {
407                 /* Register the regulators */
408                 tps->info[i] = info;
409                 if (init_data && init_data[i].driver_data) {
410                         struct tps6507x_reg_platform_data *data =
411                                         init_data[i].driver_data;
412                         info->defdcdc_default = data->defdcdc_default;
413                 }
414
415                 tps->desc[i].name = info->name;
416                 tps->desc[i].of_match = of_match_ptr(info->name);
417                 tps->desc[i].regulators_node = of_match_ptr("regulators");
418                 tps->desc[i].of_parse_cb = tps6507x_pmic_of_parse_cb;
419                 tps->desc[i].id = i;
420                 tps->desc[i].n_voltages = info->table_len;
421                 tps->desc[i].volt_table = info->table;
422                 tps->desc[i].ops = &tps6507x_pmic_ops;
423                 tps->desc[i].type = REGULATOR_VOLTAGE;
424                 tps->desc[i].owner = THIS_MODULE;
425
426                 config.dev = tps6507x_dev->dev;
427                 config.init_data = init_data;
428                 config.driver_data = tps;
429
430                 rdev = devm_regulator_register(&pdev->dev, &tps->desc[i],
431                                                &config);
432                 if (IS_ERR(rdev)) {
433                         dev_err(tps6507x_dev->dev,
434                                 "failed to register %s regulator\n",
435                                 pdev->name);
436                         return PTR_ERR(rdev);
437                 }
438         }
439
440         tps6507x_dev->pmic = tps;
441         platform_set_drvdata(pdev, tps6507x_dev);
442
443         return 0;
444 }
445
446 static struct platform_driver tps6507x_pmic_driver = {
447         .driver = {
448                 .name = "tps6507x-pmic",
449         },
450         .probe = tps6507x_pmic_probe,
451 };
452
453 static int __init tps6507x_pmic_init(void)
454 {
455         return platform_driver_register(&tps6507x_pmic_driver);
456 }
457 subsys_initcall(tps6507x_pmic_init);
458
459 static void __exit tps6507x_pmic_cleanup(void)
460 {
461         platform_driver_unregister(&tps6507x_pmic_driver);
462 }
463 module_exit(tps6507x_pmic_cleanup);
464
465 MODULE_AUTHOR("Texas Instruments");
466 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
467 MODULE_LICENSE("GPL v2");
468 MODULE_ALIAS("platform:tps6507x-pmic");