Merge remote-tracking branch 'regulator/topic/change' into regulator-next
[linux-3.10.git] / drivers / regulator / tps65217-regulator.c
1 /*
2  * tps65217-regulator.c
3  *
4  * Regulator driver for TPS65217 PMIC
5  *
6  * Copyright (C) 2011 Texas Instruments Incorporated - http://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
13  * kind, whether express or implied; without even the implied warranty
14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/init.h>
22 #include <linux/err.h>
23 #include <linux/platform_device.h>
24
25 #include <linux/regulator/of_regulator.h>
26 #include <linux/regulator/driver.h>
27 #include <linux/regulator/machine.h>
28 #include <linux/mfd/tps65217.h>
29
30 #define TPS65217_REGULATOR(_name, _id, _ops, _n, _vr, _vm, _em, _t) \
31         {                                               \
32                 .name           = _name,                \
33                 .id             = _id,                  \
34                 .ops            = &_ops,                \
35                 .n_voltages     = _n,                   \
36                 .type           = REGULATOR_VOLTAGE,    \
37                 .owner          = THIS_MODULE,          \
38                 .vsel_reg       = _vr,                  \
39                 .vsel_mask      = _vm,                  \
40                 .enable_reg     = TPS65217_REG_ENABLE,  \
41                 .enable_mask    = _em,                  \
42                 .volt_table     = _t,                   \
43         }                                               \
44
45 #define TPS65217_INFO(_nm, _min, _max, _f1, _f2)        \
46         {                                               \
47                 .name           = _nm,                  \
48                 .min_uV         = _min,                 \
49                 .max_uV         = _max,                 \
50                 .vsel_to_uv     = _f1,                  \
51                 .uv_to_vsel     = _f2,                  \
52         }
53
54 static const unsigned int LDO1_VSEL_table[] = {
55         1000000, 1100000, 1200000, 1250000,
56         1300000, 1350000, 1400000, 1500000,
57         1600000, 1800000, 2500000, 2750000,
58         2800000, 3000000, 3100000, 3300000,
59 };
60
61 static int tps65217_vsel_to_uv1(unsigned int vsel)
62 {
63         int uV = 0;
64
65         if (vsel > 63)
66                 return -EINVAL;
67
68         if (vsel <= 24)
69                 uV = vsel * 25000 + 900000;
70         else if (vsel <= 52)
71                 uV = (vsel - 24) * 50000 + 1500000;
72         else if (vsel < 56)
73                 uV = (vsel - 52) * 100000 + 2900000;
74         else
75                 uV = 3300000;
76
77         return uV;
78 }
79
80 static int tps65217_uv_to_vsel1(int uV, unsigned int *vsel)
81 {
82         if (uV < 0 || uV > 3300000)
83                 return -EINVAL;
84
85         if (uV <= 1500000)
86                 *vsel = DIV_ROUND_UP(uV - 900000, 25000);
87         else if (uV <= 2900000)
88                 *vsel = 24 + DIV_ROUND_UP(uV - 1500000, 50000);
89         else if (uV < 3300000)
90                 *vsel = 52 + DIV_ROUND_UP(uV - 2900000, 100000);
91         else
92                 *vsel = 56;
93
94         return 0;
95 }
96
97 static int tps65217_vsel_to_uv2(unsigned int vsel)
98 {
99         int uV = 0;
100
101         if (vsel > 31)
102                 return -EINVAL;
103
104         if (vsel <= 8)
105                 uV = vsel * 50000 + 1500000;
106         else if (vsel <= 13)
107                 uV = (vsel - 8) * 100000 + 1900000;
108         else
109                 uV = (vsel - 13) * 50000 + 2400000;
110
111         return uV;
112 }
113
114 static int tps65217_uv_to_vsel2(int uV, unsigned int *vsel)
115 {
116         if (uV < 0 || uV > 3300000)
117                 return -EINVAL;
118
119         if (uV <= 1900000)
120                 *vsel = DIV_ROUND_UP(uV - 1500000, 50000);
121         else if (uV <= 2400000)
122                 *vsel = 8 + DIV_ROUND_UP(uV - 1900000, 100000);
123         else
124                 *vsel = 13 + DIV_ROUND_UP(uV - 2400000, 50000);
125
126         return 0;
127 }
128
129 static struct tps_info tps65217_pmic_regs[] = {
130         TPS65217_INFO("DCDC1", 900000, 1800000, tps65217_vsel_to_uv1,
131                         tps65217_uv_to_vsel1),
132         TPS65217_INFO("DCDC2", 900000, 3300000, tps65217_vsel_to_uv1,
133                         tps65217_uv_to_vsel1),
134         TPS65217_INFO("DCDC3", 900000, 1500000, tps65217_vsel_to_uv1,
135                         tps65217_uv_to_vsel1),
136         TPS65217_INFO("LDO1", 1000000, 3300000, NULL, NULL),
137         TPS65217_INFO("LDO2", 900000, 3300000, tps65217_vsel_to_uv1,
138                         tps65217_uv_to_vsel1),
139         TPS65217_INFO("LDO3", 1800000, 3300000, tps65217_vsel_to_uv2,
140                         tps65217_uv_to_vsel2),
141         TPS65217_INFO("LDO4", 1800000, 3300000, tps65217_vsel_to_uv2,
142                         tps65217_uv_to_vsel2),
143 };
144
145 static int tps65217_pmic_enable(struct regulator_dev *dev)
146 {
147         struct tps65217 *tps = rdev_get_drvdata(dev);
148         unsigned int rid = rdev_get_id(dev);
149
150         if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
151                 return -EINVAL;
152
153         /* Enable the regulator and password protection is level 1 */
154         return tps65217_set_bits(tps, TPS65217_REG_ENABLE,
155                                  dev->desc->enable_mask, dev->desc->enable_mask,
156                                  TPS65217_PROTECT_L1);
157 }
158
159 static int tps65217_pmic_disable(struct regulator_dev *dev)
160 {
161         struct tps65217 *tps = rdev_get_drvdata(dev);
162         unsigned int rid = rdev_get_id(dev);
163
164         if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
165                 return -EINVAL;
166
167         /* Disable the regulator and password protection is level 1 */
168         return tps65217_clear_bits(tps, TPS65217_REG_ENABLE,
169                                    dev->desc->enable_mask, TPS65217_PROTECT_L1);
170 }
171
172 static int tps65217_pmic_set_voltage_sel(struct regulator_dev *dev,
173                                          unsigned selector)
174 {
175         int ret;
176         struct tps65217 *tps = rdev_get_drvdata(dev);
177         unsigned int rid = rdev_get_id(dev);
178
179         /* Set the voltage based on vsel value and write protect level is 2 */
180         ret = tps65217_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
181                                 selector, TPS65217_PROTECT_L2);
182
183         /* Set GO bit for DCDCx to initiate voltage transistion */
184         switch (rid) {
185         case TPS65217_DCDC_1 ... TPS65217_DCDC_3:
186                 ret = tps65217_set_bits(tps, TPS65217_REG_DEFSLEW,
187                                        TPS65217_DEFSLEW_GO, TPS65217_DEFSLEW_GO,
188                                        TPS65217_PROTECT_L2);
189                 break;
190         }
191
192         return ret;
193 }
194
195 static int tps65217_pmic_map_voltage(struct regulator_dev *dev,
196                                      int min_uV, int max_uV)
197 {
198
199         struct tps65217 *tps = rdev_get_drvdata(dev);
200         unsigned int sel, rid = rdev_get_id(dev);
201         int ret;
202
203         /* LDO1 uses regulator_map_voltage_iterate() */
204         if (rid == TPS65217_LDO_1)
205                 return -EINVAL;
206
207         if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
208                 return -EINVAL;
209
210         if (min_uV < tps->info[rid]->min_uV)
211                 min_uV = tps->info[rid]->min_uV;
212
213         if (max_uV < tps->info[rid]->min_uV || min_uV > tps->info[rid]->max_uV)
214                 return -EINVAL;
215
216         ret = tps->info[rid]->uv_to_vsel(min_uV, &sel);
217         if (ret)
218                 return ret;
219
220         return sel;
221 }
222
223 static int tps65217_pmic_list_voltage(struct regulator_dev *dev,
224                                         unsigned selector)
225 {
226         struct tps65217 *tps = rdev_get_drvdata(dev);
227         unsigned int rid = rdev_get_id(dev);
228
229         if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
230                 return -EINVAL;
231
232         if (selector >= dev->desc->n_voltages)
233                 return -EINVAL;
234
235         return tps->info[rid]->vsel_to_uv(selector);
236 }
237
238 /* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
239 static struct regulator_ops tps65217_pmic_ops = {
240         .is_enabled             = regulator_is_enabled_regmap,
241         .enable                 = tps65217_pmic_enable,
242         .disable                = tps65217_pmic_disable,
243         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
244         .set_voltage_sel        = tps65217_pmic_set_voltage_sel,
245         .list_voltage           = tps65217_pmic_list_voltage,
246         .map_voltage            = tps65217_pmic_map_voltage,
247 };
248
249 /* Operations permitted on LDO1 */
250 static struct regulator_ops tps65217_pmic_ldo1_ops = {
251         .is_enabled             = regulator_is_enabled_regmap,
252         .enable                 = tps65217_pmic_enable,
253         .disable                = tps65217_pmic_disable,
254         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
255         .set_voltage_sel        = tps65217_pmic_set_voltage_sel,
256         .list_voltage           = regulator_list_voltage_table,
257 };
258
259 static const struct regulator_desc regulators[] = {
260         TPS65217_REGULATOR("DCDC1", TPS65217_DCDC_1, tps65217_pmic_ops, 64,
261                            TPS65217_REG_DEFDCDC1, TPS65217_DEFDCDCX_DCDC_MASK,
262                            TPS65217_ENABLE_DC1_EN, NULL),
263         TPS65217_REGULATOR("DCDC2", TPS65217_DCDC_2, tps65217_pmic_ops, 64,
264                            TPS65217_REG_DEFDCDC2, TPS65217_DEFDCDCX_DCDC_MASK,
265                            TPS65217_ENABLE_DC2_EN, NULL),
266         TPS65217_REGULATOR("DCDC3", TPS65217_DCDC_3, tps65217_pmic_ops, 64,
267                            TPS65217_REG_DEFDCDC3, TPS65217_DEFDCDCX_DCDC_MASK,
268                            TPS65217_ENABLE_DC3_EN, NULL),
269         TPS65217_REGULATOR("LDO1", TPS65217_LDO_1, tps65217_pmic_ldo1_ops, 16,
270                            TPS65217_REG_DEFLDO1, TPS65217_DEFLDO1_LDO1_MASK,
271                            TPS65217_ENABLE_LDO1_EN, LDO1_VSEL_table),
272         TPS65217_REGULATOR("LDO2", TPS65217_LDO_2, tps65217_pmic_ops, 64,
273                            TPS65217_REG_DEFLDO2, TPS65217_DEFLDO2_LDO2_MASK,
274                            TPS65217_ENABLE_LDO2_EN, NULL),
275         TPS65217_REGULATOR("LDO3", TPS65217_LDO_3, tps65217_pmic_ops, 32,
276                            TPS65217_REG_DEFLS1, TPS65217_DEFLDO3_LDO3_MASK,
277                            TPS65217_ENABLE_LS1_EN | TPS65217_DEFLDO3_LDO3_EN,
278                            NULL),
279         TPS65217_REGULATOR("LDO4", TPS65217_LDO_4, tps65217_pmic_ops, 32,
280                            TPS65217_REG_DEFLS2, TPS65217_DEFLDO4_LDO4_MASK,
281                            TPS65217_ENABLE_LS2_EN | TPS65217_DEFLDO4_LDO4_EN,
282                            NULL),
283 };
284
285 #ifdef CONFIG_OF
286 static struct of_regulator_match reg_matches[] = {
287         { .name = "dcdc1", .driver_data = (void *)TPS65217_DCDC_1 },
288         { .name = "dcdc2", .driver_data = (void *)TPS65217_DCDC_2 },
289         { .name = "dcdc3", .driver_data = (void *)TPS65217_DCDC_3 },
290         { .name = "ldo1", .driver_data = (void *)TPS65217_LDO_1 },
291         { .name = "ldo2", .driver_data = (void *)TPS65217_LDO_2 },
292         { .name = "ldo3", .driver_data = (void *)TPS65217_LDO_3 },
293         { .name = "ldo4", .driver_data = (void *)TPS65217_LDO_4 },
294 };
295
296 static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
297 {
298         struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
299         struct device_node *node = tps->dev->of_node;
300         struct tps65217_board *pdata;
301         struct device_node *regs;
302         int i, count;
303
304         regs = of_find_node_by_name(node, "regulators");
305         if (!regs)
306                 return NULL;
307
308         count = of_regulator_match(pdev->dev.parent, regs,
309                                 reg_matches, TPS65217_NUM_REGULATOR);
310         of_node_put(regs);
311         if ((count < 0) || (count > TPS65217_NUM_REGULATOR))
312                 return NULL;
313
314         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
315         if (!pdata)
316                 return NULL;
317
318         for (i = 0; i < count; i++) {
319                 if (!reg_matches[i].init_data || !reg_matches[i].of_node)
320                         continue;
321
322                 pdata->tps65217_init_data[i] = reg_matches[i].init_data;
323                 pdata->of_node[i] = reg_matches[i].of_node;
324         }
325
326         return pdata;
327 }
328 #else
329 static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
330 {
331         return NULL;
332 }
333 #endif
334
335 static int __devinit tps65217_regulator_probe(struct platform_device *pdev)
336 {
337         struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
338         struct tps65217_board *pdata = dev_get_platdata(tps->dev);
339         struct regulator_init_data *reg_data;
340         struct regulator_dev *rdev;
341         struct regulator_config config = { };
342         int i, ret;
343
344         if (tps->dev->of_node)
345                 pdata = tps65217_parse_dt(pdev);
346
347         if (!pdata) {
348                 dev_err(&pdev->dev, "Platform data not found\n");
349                 return -EINVAL;
350         }
351
352         if (tps65217_chip_id(tps) != TPS65217) {
353                 dev_err(&pdev->dev, "Invalid tps chip version\n");
354                 return -ENODEV;
355         }
356
357         platform_set_drvdata(pdev, tps);
358
359         for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
360
361                 reg_data = pdata->tps65217_init_data[i];
362
363                 /*
364                  * Regulator API handles empty constraints but not NULL
365                  * constraints
366                  */
367                 if (!reg_data)
368                         continue;
369
370                 /* Register the regulators */
371                 tps->info[i] = &tps65217_pmic_regs[i];
372
373                 config.dev = tps->dev;
374                 config.init_data = reg_data;
375                 config.driver_data = tps;
376                 config.regmap = tps->regmap;
377                 if (tps->dev->of_node)
378                         config.of_node = pdata->of_node[i];
379
380                 rdev = regulator_register(&regulators[i], &config);
381                 if (IS_ERR(rdev)) {
382                         dev_err(tps->dev, "failed to register %s regulator\n",
383                                 pdev->name);
384                         ret = PTR_ERR(rdev);
385                         goto err_unregister_regulator;
386                 }
387
388                 /* Save regulator for cleanup */
389                 tps->rdev[i] = rdev;
390         }
391         return 0;
392
393 err_unregister_regulator:
394         while (--i >= 0)
395                 regulator_unregister(tps->rdev[i]);
396
397         return ret;
398 }
399
400 static int __devexit tps65217_regulator_remove(struct platform_device *pdev)
401 {
402         struct tps65217 *tps = platform_get_drvdata(pdev);
403         unsigned int i;
404
405         for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
406                 regulator_unregister(tps->rdev[i]);
407
408         platform_set_drvdata(pdev, NULL);
409
410         return 0;
411 }
412
413 static struct platform_driver tps65217_regulator_driver = {
414         .driver = {
415                 .name = "tps65217-pmic",
416         },
417         .probe = tps65217_regulator_probe,
418         .remove = __devexit_p(tps65217_regulator_remove),
419 };
420
421 static int __init tps65217_regulator_init(void)
422 {
423         return platform_driver_register(&tps65217_regulator_driver);
424 }
425 subsys_initcall(tps65217_regulator_init);
426
427 static void __exit tps65217_regulator_exit(void)
428 {
429         platform_driver_unregister(&tps65217_regulator_driver);
430 }
431 module_exit(tps65217_regulator_exit);
432
433 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
434 MODULE_DESCRIPTION("TPS65217 voltage regulator driver");
435 MODULE_ALIAS("platform:tps65217-pmic");
436 MODULE_LICENSE("GPL v2");