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hfs: get rid of hfs_sync_super
[linux/fpc-iii.git] / drivers / regulator / tps62360-regulator.c
blobe534269ed44aa2afebcd4cc1c7e509354aa92877
1 /*
2 * tps62360.c -- TI tps62360
3 *
4 * Driver for processor core supply tps62360, tps62361B, tps62362 and tps62363.
5 *
6 * Copyright (c) 2012, NVIDIA Corporation.
7 *
8 * Author: Laxman Dewangan <ldewangan@nvidia.com>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation version 2.
13 *
14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
15 * whether express or implied; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 * 02111-1307, USA
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/err.h>
29 #include <linux/of.h>
30 #include <linux/of_device.h>
31 #include <linux/of_gpio.h>
32 #include <linux/regulator/of_regulator.h>
33 #include <linux/platform_device.h>
34 #include <linux/regulator/driver.h>
35 #include <linux/regulator/machine.h>
36 #include <linux/regulator/tps62360.h>
37 #include <linux/gpio.h>
38 #include <linux/i2c.h>
39 #include <linux/slab.h>
40 #include <linux/regmap.h>
41
42 /* Register definitions */
43 #define REG_VSET0 0
44 #define REG_VSET1 1
45 #define REG_VSET2 2
46 #define REG_VSET3 3
47 #define REG_CONTROL 4
48 #define REG_TEMP 5
49 #define REG_RAMPCTRL 6
50 #define REG_CHIPID 8
51
52 #define FORCE_PWM_ENABLE BIT(7)
53
54 enum chips {TPS62360, TPS62361, TPS62362, TPS62363};
55
56 #define TPS62360_BASE_VOLTAGE 770000
57 #define TPS62360_N_VOLTAGES 64
58
59 #define TPS62361_BASE_VOLTAGE 500000
60 #define TPS62361_N_VOLTAGES 128
61
62 /* tps 62360 chip information */
63 struct tps62360_chip {
64 struct device *dev;
65 struct regulator_desc desc;
66 struct regulator_dev *rdev;
67 struct regmap *regmap;
68 int chip_id;
69 int vsel0_gpio;
70 int vsel1_gpio;
71 int voltage_base;
72 u8 voltage_reg_mask;
73 bool en_internal_pulldn;
74 bool en_discharge;
75 bool valid_gpios;
76 int lru_index[4];
77 int curr_vset_vsel[4];
78 int curr_vset_id;
79 int change_uv_per_us;
80 };
81
82 /*
83 * find_voltage_set_register: Find new voltage configuration register
84 * (VSET) id.
85 * The finding of the new VSET register will be based on the LRU mechanism.
86 * Each VSET register will have different voltage configured . This
87 * Function will look if any of the VSET register have requested voltage set
88 * or not.
89 * - If it is already there then it will make that register as most
90 * recently used and return as found so that caller need not to set
91 * the VSET register but need to set the proper gpios to select this
92 * VSET register.
93 * - If requested voltage is not found then it will use the least
94 * recently mechanism to get new VSET register for new configuration
95 * and will return not_found so that caller need to set new VSET
96 * register and then gpios (both).
97 */
98 static bool find_voltage_set_register(struct tps62360_chip *tps,
99 int req_vsel, int *vset_reg_id)
100 {
101 int i;
102 bool found = false;
103 int new_vset_reg = tps->lru_index[3];
104 int found_index = 3;
105
106 for (i = 0; i < 4; ++i) {
107 if (tps->curr_vset_vsel[tps->lru_index[i]] == req_vsel) {
108 new_vset_reg = tps->lru_index[i];
109 found_index = i;
110 found = true;
111 goto update_lru_index;
112 }
113 }
114
115 update_lru_index:
116 for (i = found_index; i > 0; i--)
117 tps->lru_index[i] = tps->lru_index[i - 1];
118
119 tps->lru_index[0] = new_vset_reg;
120 *vset_reg_id = new_vset_reg;
121 return found;
122 }
123
124 static int tps62360_dcdc_get_voltage_sel(struct regulator_dev *dev)
125 {
126 struct tps62360_chip *tps = rdev_get_drvdata(dev);
127 int vsel;
128 unsigned int data;
129 int ret;
130
131 ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
132 if (ret < 0) {
133 dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
134 __func__, REG_VSET0 + tps->curr_vset_id, ret);
135 return ret;
136 }
137 vsel = (int)data & tps->voltage_reg_mask;
138 return vsel;
139 }
140
141 static int tps62360_dcdc_set_voltage_sel(struct regulator_dev *dev,
142 unsigned selector)
143 {
144 struct tps62360_chip *tps = rdev_get_drvdata(dev);
145 int ret;
146 bool found = false;
147 int new_vset_id = tps->curr_vset_id;
148
149 /*
150 * If gpios are available to select the VSET register then least
151 * recently used register for new configuration.
152 */
153 if (tps->valid_gpios)
154 found = find_voltage_set_register(tps, selector, &new_vset_id);
155
156 if (!found) {
157 ret = regmap_update_bits(tps->regmap, REG_VSET0 + new_vset_id,
158 tps->voltage_reg_mask, selector);
159 if (ret < 0) {
160 dev_err(tps->dev,
161 "%s(): register %d update failed with err %d\n",
162 __func__, REG_VSET0 + new_vset_id, ret);
163 return ret;
164 }
165 tps->curr_vset_id = new_vset_id;
166 tps->curr_vset_vsel[new_vset_id] = selector;
167 }
168
169 /* Select proper VSET register vio gpios */
170 if (tps->valid_gpios) {
171 gpio_set_value_cansleep(tps->vsel0_gpio, new_vset_id & 0x1);
172 gpio_set_value_cansleep(tps->vsel1_gpio,
173 (new_vset_id >> 1) & 0x1);
174 }
175 return 0;
176 }
177
178 static int tps62360_set_voltage_time_sel(struct regulator_dev *rdev,
179 unsigned int old_selector, unsigned int new_selector)
180 {
181 struct tps62360_chip *tps = rdev_get_drvdata(rdev);
182 int old_uV, new_uV;
183
184 old_uV = regulator_list_voltage_linear(rdev, old_selector);
185 if (old_uV < 0)
186 return old_uV;
187
188 new_uV = regulator_list_voltage_linear(rdev, new_selector);
189 if (new_uV < 0)
190 return new_uV;
191
192 return DIV_ROUND_UP(abs(old_uV - new_uV), tps->change_uv_per_us);
193 }
194
195 static int tps62360_set_mode(struct regulator_dev *rdev, unsigned int mode)
196 {
197 struct tps62360_chip *tps = rdev_get_drvdata(rdev);
198 int i;
199 int val;
200 int ret;
201
202 /* Enable force PWM mode in FAST mode only. */
203 switch (mode) {
204 case REGULATOR_MODE_FAST:
205 val = FORCE_PWM_ENABLE;
206 break;
207
208 case REGULATOR_MODE_NORMAL:
209 val = 0;
210 break;
211
212 default:
213 return -EINVAL;
214 }
215
216 if (!tps->valid_gpios) {
217 ret = regmap_update_bits(tps->regmap,
218 REG_VSET0 + tps->curr_vset_id, FORCE_PWM_ENABLE, val);
219 if (ret < 0)
220 dev_err(tps->dev,
221 "%s(): register %d update failed with err %d\n",
222 __func__, REG_VSET0 + tps->curr_vset_id, ret);
223 return ret;
224 }
225
226 /* If gpios are valid then all register set need to be control */
227 for (i = 0; i < 4; ++i) {
228 ret = regmap_update_bits(tps->regmap,
229 REG_VSET0 + i, FORCE_PWM_ENABLE, val);
230 if (ret < 0) {
231 dev_err(tps->dev,
232 "%s(): register %d update failed with err %d\n",
233 __func__, REG_VSET0 + i, ret);
234 return ret;
235 }
236 }
237 return ret;
238 }
239
240 static unsigned int tps62360_get_mode(struct regulator_dev *rdev)
241 {
242 struct tps62360_chip *tps = rdev_get_drvdata(rdev);
243 unsigned int data;
244 int ret;
245
246 ret = regmap_read(tps->regmap, REG_VSET0 + tps->curr_vset_id, &data);
247 if (ret < 0) {
248 dev_err(tps->dev, "%s(): register %d read failed with err %d\n",
249 __func__, REG_VSET0 + tps->curr_vset_id, ret);
250 return ret;
251 }
252 return (data & FORCE_PWM_ENABLE) ?
253 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
254 }
255
256 static struct regulator_ops tps62360_dcdc_ops = {
257 .get_voltage_sel = tps62360_dcdc_get_voltage_sel,
258 .set_voltage_sel = tps62360_dcdc_set_voltage_sel,
259 .list_voltage = regulator_list_voltage_linear,
260 .map_voltage = regulator_map_voltage_linear,
261 .set_voltage_time_sel = tps62360_set_voltage_time_sel,
262 .set_mode = tps62360_set_mode,
263 .get_mode = tps62360_get_mode,
264 };
265
266 static int __devinit tps62360_init_dcdc(struct tps62360_chip *tps,
267 struct tps62360_regulator_platform_data *pdata)
268 {
269 int ret;
270 unsigned int ramp_ctrl;
271
272 /* Initialize internal pull up/down control */
273 if (tps->en_internal_pulldn)
274 ret = regmap_write(tps->regmap, REG_CONTROL, 0xE0);
275 else
276 ret = regmap_write(tps->regmap, REG_CONTROL, 0x0);
277 if (ret < 0) {
278 dev_err(tps->dev,
279 "%s(): register %d write failed with err %d\n",
280 __func__, REG_CONTROL, ret);
281 return ret;
282 }
283
284 /* Reset output discharge path to reduce power consumption */
285 ret = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), 0);
286 if (ret < 0) {
287 dev_err(tps->dev,
288 "%s(): register %d update failed with err %d\n",
289 __func__, REG_RAMPCTRL, ret);
290 return ret;
291 }
292
293 /* Get ramp value from ramp control register */
294 ret = regmap_read(tps->regmap, REG_RAMPCTRL, &ramp_ctrl);
295 if (ret < 0) {
296 dev_err(tps->dev,
297 "%s(): register %d read failed with err %d\n",
298 __func__, REG_RAMPCTRL, ret);
299 return ret;
300 }
301 ramp_ctrl = (ramp_ctrl >> 4) & 0x7;
302
303 /* ramp mV/us = 32/(2^ramp_ctrl) */
304 tps->change_uv_per_us = DIV_ROUND_UP(32000, BIT(ramp_ctrl));
305 return ret;
306 }
307
308 static const struct regmap_config tps62360_regmap_config = {
309 .reg_bits = 8,
310 .val_bits = 8,
311 .max_register = REG_CHIPID,
312 .cache_type = REGCACHE_RBTREE,
313 };
314
315 static struct tps62360_regulator_platform_data *
316 of_get_tps62360_platform_data(struct device *dev)
317 {
318 struct tps62360_regulator_platform_data *pdata;
319 struct device_node *np = dev->of_node;
320
321 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
322 if (!pdata) {
323 dev_err(dev, "Memory alloc failed for platform data\n");
324 return NULL;
325 }
326
327 pdata->reg_init_data = of_get_regulator_init_data(dev, dev->of_node);
328 if (!pdata->reg_init_data) {
329 dev_err(dev, "Not able to get OF regulator init data\n");
330 return NULL;
331 }
332
333 pdata->vsel0_gpio = of_get_named_gpio(np, "vsel0-gpio", 0);
334 pdata->vsel1_gpio = of_get_named_gpio(np, "vsel1-gpio", 0);
335
336 if (of_find_property(np, "ti,vsel0-state-high", NULL))
337 pdata->vsel0_def_state = 1;
338
339 if (of_find_property(np, "ti,vsel1-state-high", NULL))
340 pdata->vsel1_def_state = 1;
341
342 if (of_find_property(np, "ti,enable-pull-down", NULL))
343 pdata->en_internal_pulldn = true;
344
345 if (of_find_property(np, "ti,enable-vout-discharge", NULL))
346 pdata->en_discharge = true;
347
348 return pdata;
349 }
350
351 #if defined(CONFIG_OF)
352 static const struct of_device_id tps62360_of_match[] = {
353 { .compatible = "ti,tps62360", .data = (void *)TPS62360},
354 { .compatible = "ti,tps62361", .data = (void *)TPS62361},
355 { .compatible = "ti,tps62362", .data = (void *)TPS62362},
356 { .compatible = "ti,tps62363", .data = (void *)TPS62363},
357 {},
358 };
359 MODULE_DEVICE_TABLE(of, tps62360_of_match);
360 #endif
361
362 static int __devinit tps62360_probe(struct i2c_client *client,
363 const struct i2c_device_id *id)
364 {
365 struct regulator_config config = { };
366 struct tps62360_regulator_platform_data *pdata;
367 struct regulator_dev *rdev;
368 struct tps62360_chip *tps;
369 int ret;
370 int i;
371 int chip_id;
372
373 pdata = client->dev.platform_data;
374 chip_id = id->driver_data;
375
376 if (client->dev.of_node) {
377 const struct of_device_id *match;
378 match = of_match_device(of_match_ptr(tps62360_of_match),
379 &client->dev);
380 if (!match) {
381 dev_err(&client->dev, "Error: No device match found\n");
382 return -ENODEV;
383 }
384 chip_id = (int)match->data;
385 if (!pdata)
386 pdata = of_get_tps62360_platform_data(&client->dev);
387 }
388
389 if (!pdata) {
390 dev_err(&client->dev, "%s(): Platform data not found\n",
391 __func__);
392 return -EIO;
393 }
394
395 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
396 if (!tps) {
397 dev_err(&client->dev, "%s(): Memory allocation failed\n",
398 __func__);
399 return -ENOMEM;
400 }
401
402 tps->en_discharge = pdata->en_discharge;
403 tps->en_internal_pulldn = pdata->en_internal_pulldn;
404 tps->vsel0_gpio = pdata->vsel0_gpio;
405 tps->vsel1_gpio = pdata->vsel1_gpio;
406 tps->dev = &client->dev;
407
408 switch (chip_id) {
409 case TPS62360:
410 case TPS62362:
411 tps->voltage_base = TPS62360_BASE_VOLTAGE;
412 tps->voltage_reg_mask = 0x3F;
413 tps->desc.n_voltages = TPS62360_N_VOLTAGES;
414 break;
415 case TPS62361:
416 case TPS62363:
417 tps->voltage_base = TPS62361_BASE_VOLTAGE;
418 tps->voltage_reg_mask = 0x7F;
419 tps->desc.n_voltages = TPS62361_N_VOLTAGES;
420 break;
421 default:
422 return -ENODEV;
423 }
424
425 tps->desc.name = id->name;
426 tps->desc.id = 0;
427 tps->desc.ops = &tps62360_dcdc_ops;
428 tps->desc.type = REGULATOR_VOLTAGE;
429 tps->desc.owner = THIS_MODULE;
430 tps->desc.min_uV = tps->voltage_base;
431 tps->desc.uV_step = 10000;
432
433 tps->regmap = devm_regmap_init_i2c(client, &tps62360_regmap_config);
434 if (IS_ERR(tps->regmap)) {
435 ret = PTR_ERR(tps->regmap);
436 dev_err(&client->dev,
437 "%s(): regmap allocation failed with err %d\n",
438 __func__, ret);
439 return ret;
440 }
441 i2c_set_clientdata(client, tps);
442
443 tps->curr_vset_id = (pdata->vsel1_def_state & 1) * 2 +
444 (pdata->vsel0_def_state & 1);
445 tps->lru_index[0] = tps->curr_vset_id;
446 tps->valid_gpios = false;
447
448 if (gpio_is_valid(tps->vsel0_gpio) && gpio_is_valid(tps->vsel1_gpio)) {
449 int gpio_flags;
450 gpio_flags = (pdata->vsel0_def_state) ?
451 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
452 ret = gpio_request_one(tps->vsel0_gpio,
453 gpio_flags, "tps62360-vsel0");
454 if (ret) {
455 dev_err(&client->dev,
456 "%s(): Could not obtain vsel0 GPIO %d: %d\n",
457 __func__, tps->vsel0_gpio, ret);
458 goto err_gpio0;
459 }
460
461 gpio_flags = (pdata->vsel1_def_state) ?
462 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
463 ret = gpio_request_one(tps->vsel1_gpio,
464 gpio_flags, "tps62360-vsel1");
465 if (ret) {
466 dev_err(&client->dev,
467 "%s(): Could not obtain vsel1 GPIO %d: %d\n",
468 __func__, tps->vsel1_gpio, ret);
469 goto err_gpio1;
470 }
471 tps->valid_gpios = true;
472
473 /*
474 * Initialize the lru index with vset_reg id
475 * The index 0 will be most recently used and
476 * set with the tps->curr_vset_id */
477 for (i = 0; i < 4; ++i)
478 tps->lru_index[i] = i;
479 tps->lru_index[0] = tps->curr_vset_id;
480 tps->lru_index[tps->curr_vset_id] = 0;
481 }
482
483 ret = tps62360_init_dcdc(tps, pdata);
484 if (ret < 0) {
485 dev_err(tps->dev, "%s(): Init failed with err = %d\n",
486 __func__, ret);
487 goto err_init;
488 }
489
490 config.dev = &client->dev;
491 config.init_data = pdata->reg_init_data;
492 config.driver_data = tps;
493 config.of_node = client->dev.of_node;
494
495 /* Register the regulators */
496 rdev = regulator_register(&tps->desc, &config);
497 if (IS_ERR(rdev)) {
498 dev_err(tps->dev,
499 "%s(): regulator register failed with err %s\n",
500 __func__, id->name);
501 ret = PTR_ERR(rdev);
502 goto err_init;
503 }
504
505 tps->rdev = rdev;
506 return 0;
507
508 err_init:
509 if (gpio_is_valid(tps->vsel1_gpio))
510 gpio_free(tps->vsel1_gpio);
511 err_gpio1:
512 if (gpio_is_valid(tps->vsel0_gpio))
513 gpio_free(tps->vsel0_gpio);
514 err_gpio0:
515 return ret;
516 }
517
518 /**
519 * tps62360_remove - tps62360 driver i2c remove handler
520 * @client: i2c driver client device structure
521 *
522 * Unregister TPS driver as an i2c client device driver
523 */
524 static int __devexit tps62360_remove(struct i2c_client *client)
525 {
526 struct tps62360_chip *tps = i2c_get_clientdata(client);
527
528 if (gpio_is_valid(tps->vsel1_gpio))
529 gpio_free(tps->vsel1_gpio);
530
531 if (gpio_is_valid(tps->vsel0_gpio))
532 gpio_free(tps->vsel0_gpio);
533
534 regulator_unregister(tps->rdev);
535 return 0;
536 }
537
538 static void tps62360_shutdown(struct i2c_client *client)
539 {
540 struct tps62360_chip *tps = i2c_get_clientdata(client);
541 int st;
542
543 if (!tps->en_discharge)
544 return;
545
546 /* Configure the output discharge path */
547 st = regmap_update_bits(tps->regmap, REG_RAMPCTRL, BIT(2), BIT(2));
548 if (st < 0)
549 dev_err(tps->dev,
550 "%s(): register %d update failed with err %d\n",
551 __func__, REG_RAMPCTRL, st);
552 }
553
554 static const struct i2c_device_id tps62360_id[] = {
555 {.name = "tps62360", .driver_data = TPS62360},
556 {.name = "tps62361", .driver_data = TPS62361},
557 {.name = "tps62362", .driver_data = TPS62362},
558 {.name = "tps62363", .driver_data = TPS62363},
559 {},
560 };
561
562 MODULE_DEVICE_TABLE(i2c, tps62360_id);
563
564 static struct i2c_driver tps62360_i2c_driver = {
565 .driver = {
566 .name = "tps62360",
567 .owner = THIS_MODULE,
568 .of_match_table = of_match_ptr(tps62360_of_match),
569 },
570 .probe = tps62360_probe,
571 .remove = __devexit_p(tps62360_remove),
572 .shutdown = tps62360_shutdown,
573 .id_table = tps62360_id,
574 };
575
576 static int __init tps62360_init(void)
577 {
578 return i2c_add_driver(&tps62360_i2c_driver);
579 }
580 subsys_initcall(tps62360_init);
581
582 static void __exit tps62360_cleanup(void)
583 {
584 i2c_del_driver(&tps62360_i2c_driver);
585 }
586 module_exit(tps62360_cleanup);
587
588 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
589 MODULE_DESCRIPTION("TPS6236x voltage regulator driver");
590 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support