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Linux/drivers/regulator/tps65090-regulator.c

  1 /*
  2  * Regulator driver for tps65090 power management chip.
  3  *
  4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
  5 
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms and conditions of the GNU General Public License,
  8  * version 2, as published by the Free Software Foundation.
  9 
 10  * This program is distributed in the hope it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13  * more details.
 14 
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program.  If not, see <http://www.gnu.org/licenses/>
 17  */
 18 
 19 #include <linux/module.h>
 20 #include <linux/delay.h>
 21 #include <linux/init.h>
 22 #include <linux/gpio.h>
 23 #include <linux/of_gpio.h>
 24 #include <linux/slab.h>
 25 #include <linux/err.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/regulator/driver.h>
 28 #include <linux/regulator/machine.h>
 29 #include <linux/regulator/of_regulator.h>
 30 #include <linux/mfd/tps65090.h>
 31 
 32 #define MAX_CTRL_READ_TRIES     5
 33 #define MAX_FET_ENABLE_TRIES    1000
 34 
 35 #define CTRL_EN_BIT             0 /* Regulator enable bit, active high */
 36 #define CTRL_WT_BIT             2 /* Regulator wait time 0 bit */
 37 #define CTRL_PG_BIT             4 /* Regulator power good bit, 1=good */
 38 #define CTRL_TO_BIT             7 /* Regulator timeout bit, 1=wait */
 39 
 40 #define MAX_OVERCURRENT_WAIT    3 /* Overcurrent wait must be <= this */
 41 
 42 /**
 43  * struct tps65090_regulator - Per-regulator data for a tps65090 regulator
 44  *
 45  * @dev: Pointer to our device.
 46  * @desc: The struct regulator_desc for the regulator.
 47  * @rdev: The struct regulator_dev for the regulator.
 48  * @overcurrent_wait_valid: True if overcurrent_wait is valid.
 49  * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
 50  */
 51 
 52 struct tps65090_regulator {
 53         struct device           *dev;
 54         struct regulator_desc   *desc;
 55         struct regulator_dev    *rdev;
 56         bool                    overcurrent_wait_valid;
 57         int                     overcurrent_wait;
 58 };
 59 
 60 static struct regulator_ops tps65090_ext_control_ops = {
 61 };
 62 
 63 /**
 64  * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait
 65  *
 66  * This will set the overcurrent wait time based on what's in the regulator
 67  * info.
 68  *
 69  * @ri:         Overall regulator data
 70  * @rdev:       Regulator device
 71  *
 72  * Return: 0 if no error, non-zero if there was an error writing the register.
 73  */
 74 static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri,
 75                                              struct regulator_dev *rdev)
 76 {
 77         int ret;
 78 
 79         ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 80                                  MAX_OVERCURRENT_WAIT << CTRL_WT_BIT,
 81                                  ri->overcurrent_wait << CTRL_WT_BIT);
 82         if (ret) {
 83                 dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n",
 84                         rdev->desc->enable_reg);
 85         }
 86 
 87         return ret;
 88 }
 89 
 90 /**
 91  * tps65090_try_enable_fet - Try to enable a FET
 92  *
 93  * @rdev:       Regulator device
 94  *
 95  * Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get
 96  * set, or some other -ve value if another error occurred (e.g. i2c error)
 97  */
 98 static int tps65090_try_enable_fet(struct regulator_dev *rdev)
 99 {
100         unsigned int control;
101         int ret, i;
102 
103         ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
104                                  rdev->desc->enable_mask,
105                                  rdev->desc->enable_mask);
106         if (ret < 0) {
107                 dev_err(&rdev->dev, "Error in updating reg %#x\n",
108                         rdev->desc->enable_reg);
109                 return ret;
110         }
111 
112         for (i = 0; i < MAX_CTRL_READ_TRIES; i++) {
113                 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg,
114                                   &control);
115                 if (ret < 0)
116                         return ret;
117 
118                 if (!(control & BIT(CTRL_TO_BIT)))
119                         break;
120 
121                 usleep_range(1000, 1500);
122         }
123         if (!(control & BIT(CTRL_PG_BIT)))
124                 return -ENOTRECOVERABLE;
125 
126         return 0;
127 }
128 
129 /**
130  * tps65090_fet_enable - Enable a FET, trying a few times if it fails
131  *
132  * Some versions of the tps65090 have issues when turning on the FETs.
133  * This function goes through several steps to ensure the best chance of the
134  * FET going on.  Specifically:
135  * - We'll make sure that we bump the "overcurrent wait" to the maximum, which
136  *   increases the chances that we'll turn on properly.
137  * - We'll retry turning the FET on multiple times (turning off in between).
138  *
139  * @rdev:       Regulator device
140  *
141  * Return: 0 if ok, non-zero if it fails.
142  */
143 static int tps65090_fet_enable(struct regulator_dev *rdev)
144 {
145         int ret, tries;
146 
147         /*
148          * Try enabling multiple times until we succeed since sometimes the
149          * first try times out.
150          */
151         tries = 0;
152         while (true) {
153                 ret = tps65090_try_enable_fet(rdev);
154                 if (!ret)
155                         break;
156                 if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES)
157                         goto err;
158 
159                 /* Try turning the FET off (and then on again) */
160                 ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
161                                          rdev->desc->enable_mask, 0);
162                 if (ret)
163                         goto err;
164 
165                 tries++;
166         }
167 
168         if (tries)
169                 dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n",
170                          rdev->desc->enable_reg, tries);
171 
172         return 0;
173 err:
174         dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg);
175         WARN_ON(1);
176 
177         return ret;
178 }
179 
180 static struct regulator_ops tps65090_reg_control_ops = {
181         .enable         = regulator_enable_regmap,
182         .disable        = regulator_disable_regmap,
183         .is_enabled     = regulator_is_enabled_regmap,
184 };
185 
186 static struct regulator_ops tps65090_fet_control_ops = {
187         .enable         = tps65090_fet_enable,
188         .disable        = regulator_disable_regmap,
189         .is_enabled     = regulator_is_enabled_regmap,
190 };
191 
192 static struct regulator_ops tps65090_ldo_ops = {
193 };
194 
195 #define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _ops) \
196 {                                                       \
197         .name = "TPS65090_RAILS"#_id,                   \
198         .supply_name = _sname,                          \
199         .id = TPS65090_REGULATOR_##_id,                 \
200         .ops = &_ops,                                   \
201         .enable_reg = _en_reg,                          \
202         .enable_val = _en_bits,                         \
203         .enable_mask = _en_bits,                        \
204         .type = REGULATOR_VOLTAGE,                      \
205         .owner = THIS_MODULE,                           \
206 }
207 
208 static struct regulator_desc tps65090_regulator_desc[] = {
209         tps65090_REG_DESC(DCDC1, "vsys1",   0x0C, BIT(CTRL_EN_BIT),
210                           tps65090_reg_control_ops),
211         tps65090_REG_DESC(DCDC2, "vsys2",   0x0D, BIT(CTRL_EN_BIT),
212                           tps65090_reg_control_ops),
213         tps65090_REG_DESC(DCDC3, "vsys3",   0x0E, BIT(CTRL_EN_BIT),
214                           tps65090_reg_control_ops),
215 
216         tps65090_REG_DESC(FET1,  "infet1",  0x0F,
217                           BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
218                           tps65090_fet_control_ops),
219         tps65090_REG_DESC(FET2,  "infet2",  0x10,
220                           BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
221                           tps65090_fet_control_ops),
222         tps65090_REG_DESC(FET3,  "infet3",  0x11,
223                           BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
224                           tps65090_fet_control_ops),
225         tps65090_REG_DESC(FET4,  "infet4",  0x12,
226                           BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
227                           tps65090_fet_control_ops),
228         tps65090_REG_DESC(FET5,  "infet5",  0x13,
229                           BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
230                           tps65090_fet_control_ops),
231         tps65090_REG_DESC(FET6,  "infet6",  0x14,
232                           BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
233                           tps65090_fet_control_ops),
234         tps65090_REG_DESC(FET7,  "infet7",  0x15,
235                           BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
236                           tps65090_fet_control_ops),
237 
238         tps65090_REG_DESC(LDO1,  "vsys-l1", 0, 0,
239                           tps65090_ldo_ops),
240         tps65090_REG_DESC(LDO2,  "vsys-l2", 0, 0,
241                           tps65090_ldo_ops),
242 };
243 
244 static inline bool is_dcdc(int id)
245 {
246         switch (id) {
247         case TPS65090_REGULATOR_DCDC1:
248         case TPS65090_REGULATOR_DCDC2:
249         case TPS65090_REGULATOR_DCDC3:
250                 return true;
251         default:
252                 return false;
253         }
254 }
255 
256 static int tps65090_config_ext_control(
257         struct tps65090_regulator *ri, bool enable)
258 {
259         int ret;
260         struct device *parent = ri->dev->parent;
261         unsigned int reg_en_reg = ri->desc->enable_reg;
262 
263         if (enable)
264                 ret = tps65090_set_bits(parent, reg_en_reg, 1);
265         else
266                 ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
267         if (ret < 0)
268                 dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
269         return ret;
270 }
271 
272 static int tps65090_regulator_disable_ext_control(
273                 struct tps65090_regulator *ri,
274                 struct tps65090_regulator_plat_data *tps_pdata)
275 {
276         int ret = 0;
277         struct device *parent = ri->dev->parent;
278         unsigned int reg_en_reg = ri->desc->enable_reg;
279 
280         /*
281          * First enable output for internal control if require.
282          * And then disable external control.
283          */
284         if (tps_pdata->reg_init_data->constraints.always_on ||
285                         tps_pdata->reg_init_data->constraints.boot_on) {
286                 ret =  tps65090_set_bits(parent, reg_en_reg, 0);
287                 if (ret < 0) {
288                         dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
289                         return ret;
290                 }
291         }
292         return tps65090_config_ext_control(ri, false);
293 }
294 
295 static void tps65090_configure_regulator_config(
296                 struct tps65090_regulator_plat_data *tps_pdata,
297                 struct regulator_config *config)
298 {
299         if (gpio_is_valid(tps_pdata->gpio)) {
300                 int gpio_flag = GPIOF_OUT_INIT_LOW;
301 
302                 if (tps_pdata->reg_init_data->constraints.always_on ||
303                                 tps_pdata->reg_init_data->constraints.boot_on)
304                         gpio_flag = GPIOF_OUT_INIT_HIGH;
305 
306                 config->ena_gpio = tps_pdata->gpio;
307                 config->ena_gpio_flags = gpio_flag;
308         }
309 }
310 
311 #ifdef CONFIG_OF
312 static struct of_regulator_match tps65090_matches[] = {
313         { .name = "dcdc1", },
314         { .name = "dcdc2", },
315         { .name = "dcdc3", },
316         { .name = "fet1",  },
317         { .name = "fet2",  },
318         { .name = "fet3",  },
319         { .name = "fet4",  },
320         { .name = "fet5",  },
321         { .name = "fet6",  },
322         { .name = "fet7",  },
323         { .name = "ldo1",  },
324         { .name = "ldo2",  },
325 };
326 
327 static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
328                 struct platform_device *pdev,
329                 struct of_regulator_match **tps65090_reg_matches)
330 {
331         struct tps65090_platform_data *tps65090_pdata;
332         struct device_node *np = pdev->dev.parent->of_node;
333         struct device_node *regulators;
334         int idx = 0, ret;
335         struct tps65090_regulator_plat_data *reg_pdata;
336 
337         tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
338                                 GFP_KERNEL);
339         if (!tps65090_pdata)
340                 return ERR_PTR(-ENOMEM);
341 
342         reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX *
343                                 sizeof(*reg_pdata), GFP_KERNEL);
344         if (!reg_pdata)
345                 return ERR_PTR(-ENOMEM);
346 
347         regulators = of_get_child_by_name(np, "regulators");
348         if (!regulators) {
349                 dev_err(&pdev->dev, "regulator node not found\n");
350                 return ERR_PTR(-ENODEV);
351         }
352 
353         ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
354                         ARRAY_SIZE(tps65090_matches));
355         of_node_put(regulators);
356         if (ret < 0) {
357                 dev_err(&pdev->dev,
358                         "Error parsing regulator init data: %d\n", ret);
359                 return ERR_PTR(ret);
360         }
361 
362         *tps65090_reg_matches = tps65090_matches;
363         for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
364                 struct regulator_init_data *ri_data;
365                 struct tps65090_regulator_plat_data *rpdata;
366 
367                 rpdata = &reg_pdata[idx];
368                 ri_data = tps65090_matches[idx].init_data;
369                 if (!ri_data || !tps65090_matches[idx].of_node)
370                         continue;
371 
372                 rpdata->reg_init_data = ri_data;
373                 rpdata->enable_ext_control = of_property_read_bool(
374                                         tps65090_matches[idx].of_node,
375                                         "ti,enable-ext-control");
376                 if (rpdata->enable_ext_control)
377                         rpdata->gpio = of_get_named_gpio(np,
378                                         "dcdc-ext-control-gpios", 0);
379 
380                 if (of_property_read_u32(tps65090_matches[idx].of_node,
381                                          "ti,overcurrent-wait",
382                                          &rpdata->overcurrent_wait) == 0)
383                         rpdata->overcurrent_wait_valid = true;
384 
385                 tps65090_pdata->reg_pdata[idx] = rpdata;
386         }
387         return tps65090_pdata;
388 }
389 #else
390 static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
391                         struct platform_device *pdev,
392                         struct of_regulator_match **tps65090_reg_matches)
393 {
394         *tps65090_reg_matches = NULL;
395         return NULL;
396 }
397 #endif
398 
399 static int tps65090_regulator_probe(struct platform_device *pdev)
400 {
401         struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
402         struct tps65090_regulator *ri = NULL;
403         struct regulator_config config = { };
404         struct regulator_dev *rdev;
405         struct tps65090_regulator_plat_data *tps_pdata;
406         struct tps65090_regulator *pmic;
407         struct tps65090_platform_data *tps65090_pdata;
408         struct of_regulator_match *tps65090_reg_matches = NULL;
409         int num;
410         int ret;
411 
412         dev_dbg(&pdev->dev, "Probing regulator\n");
413 
414         tps65090_pdata = dev_get_platdata(pdev->dev.parent);
415         if (!tps65090_pdata && tps65090_mfd->dev->of_node)
416                 tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
417                                         &tps65090_reg_matches);
418         if (IS_ERR_OR_NULL(tps65090_pdata)) {
419                 dev_err(&pdev->dev, "Platform data missing\n");
420                 return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
421         }
422 
423         pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
424                         GFP_KERNEL);
425         if (!pmic)
426                 return -ENOMEM;
427 
428         for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
429                 tps_pdata = tps65090_pdata->reg_pdata[num];
430 
431                 ri = &pmic[num];
432                 ri->dev = &pdev->dev;
433                 ri->desc = &tps65090_regulator_desc[num];
434                 if (tps_pdata) {
435                         ri->overcurrent_wait_valid =
436                                 tps_pdata->overcurrent_wait_valid;
437                         ri->overcurrent_wait = tps_pdata->overcurrent_wait;
438                 }
439 
440                 /*
441                  * TPS5090 DCDC support the control from external digital input.
442                  * Configure it as per platform data.
443                  */
444                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
445                         if (tps_pdata->enable_ext_control) {
446                                 tps65090_configure_regulator_config(
447                                                 tps_pdata, &config);
448                                 ri->desc->ops = &tps65090_ext_control_ops;
449                         } else {
450                                 ret = tps65090_regulator_disable_ext_control(
451                                                 ri, tps_pdata);
452                                 if (ret < 0) {
453                                         dev_err(&pdev->dev,
454                                                 "failed disable ext control\n");
455                                         return ret;
456                                 }
457                         }
458                 }
459 
460                 config.dev = pdev->dev.parent;
461                 config.driver_data = ri;
462                 config.regmap = tps65090_mfd->rmap;
463                 if (tps_pdata)
464                         config.init_data = tps_pdata->reg_init_data;
465                 else
466                         config.init_data = NULL;
467                 if (tps65090_reg_matches)
468                         config.of_node = tps65090_reg_matches[num].of_node;
469                 else
470                         config.of_node = NULL;
471 
472                 rdev = devm_regulator_register(&pdev->dev, ri->desc, &config);
473                 if (IS_ERR(rdev)) {
474                         dev_err(&pdev->dev, "failed to register regulator %s\n",
475                                 ri->desc->name);
476                         return PTR_ERR(rdev);
477                 }
478                 ri->rdev = rdev;
479 
480                 if (ri->overcurrent_wait_valid) {
481                         ret = tps65090_reg_set_overcurrent_wait(ri, rdev);
482                         if (ret < 0)
483                                 return ret;
484                 }
485 
486                 /* Enable external control if it is require */
487                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
488                                 tps_pdata->enable_ext_control) {
489                         ret = tps65090_config_ext_control(ri, true);
490                         if (ret < 0)
491                                 return ret;
492                 }
493         }
494 
495         platform_set_drvdata(pdev, pmic);
496         return 0;
497 }
498 
499 static struct platform_driver tps65090_regulator_driver = {
500         .driver = {
501                 .name   = "tps65090-pmic",
502                 .owner  = THIS_MODULE,
503         },
504         .probe          = tps65090_regulator_probe,
505 };
506 
507 static int __init tps65090_regulator_init(void)
508 {
509         return platform_driver_register(&tps65090_regulator_driver);
510 }
511 subsys_initcall(tps65090_regulator_init);
512 
513 static void __exit tps65090_regulator_exit(void)
514 {
515         platform_driver_unregister(&tps65090_regulator_driver);
516 }
517 module_exit(tps65090_regulator_exit);
518 
519 MODULE_DESCRIPTION("tps65090 regulator driver");
520 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
521 MODULE_LICENSE("GPL v2");
522 MODULE_ALIAS("platform:tps65090-pmic");
523 

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