Pileus Git - ~andy/linux/blob - drivers/staging/omap-thermal/omap-bandgap.c

   1 /*
   2  * OMAP4 Bandgap temperature sensor driver
   3  *
   4  * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/
   5  * Author: J Keerthy <j-keerthy@ti.com>
   6  * Author: Moiz Sonasath <m-sonasath@ti.com>
   7  * Couple of fixes, DT and MFD adaptation:
   8  *   Eduardo Valentin <eduardo.valentin@ti.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
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; 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., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/export.h>
  28 #include <linux/init.h>
  29 #include <linux/kernel.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/clk.h>
  32 #include <linux/gpio.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/err.h>
  35 #include <linux/types.h>
  36 #include <linux/mutex.h>
  37 #include <linux/reboot.h>
  38 #include <linux/of_device.h>
  39 #include <linux/of_platform.h>
  40 #include <linux/of_irq.h>
  41 #include <linux/io.h>
  42
  43 #include "omap-bandgap.h"
  44
  45 static u32 omap_bandgap_readl(struct omap_bandgap *bg_ptr, u32 reg)
  46 {
  47         return readl(bg_ptr->base + reg);
  48 }
  49
  50 static void omap_bandgap_writel(struct omap_bandgap *bg_ptr, u32 val, u32 reg)
  51 {
  52         writel(val, bg_ptr->base + reg);
  53 }
  54
  55 static int omap_bandgap_power(struct omap_bandgap *bg_ptr, bool on)
  56 {
  57         struct temp_sensor_registers *tsr;
  58         int i;
  59         u32 ctrl;
  60
  61         if (!OMAP_BANDGAP_HAS(bg_ptr, POWER_SWITCH))
  62                 return 0;
  63
  64         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
  65                 tsr = bg_ptr->conf->sensors[i].registers;
  66                 ctrl = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
  67                 ctrl &= ~tsr->bgap_tempsoff_mask;
  68                 /* active on 0 */
  69                 ctrl |= !on << __ffs(tsr->bgap_tempsoff_mask);
  70
  71                 /* write BGAP_TEMPSOFF should be reset to 0 */
  72                 omap_bandgap_writel(bg_ptr, ctrl, tsr->temp_sensor_ctrl);
  73         }
  74
  75         return 0;
  76 }
  77
  78 /* This is the Talert handler. Call it only if HAS(TALERT) is set */
  79 static irqreturn_t talert_irq_handler(int irq, void *data)
  80 {
  81         struct omap_bandgap *bg_ptr = data;
  82         struct temp_sensor_registers *tsr;
  83         u32 t_hot = 0, t_cold = 0, temp, ctrl;
  84         int i;
  85
  86         bg_ptr = data;
  87         /* Read the status of t_hot */
  88         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
  89                 tsr = bg_ptr->conf->sensors[i].registers;
  90                 t_hot = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
  91                 t_hot &= tsr->status_hot_mask;
  92
  93                 /* Read the status of t_cold */
  94                 t_cold = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
  95                 t_cold &= tsr->status_cold_mask;
  96
  97                 if (!t_cold && !t_hot)
  98                         continue;
  99
 100                 ctrl = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
 101                 /*
 102                  * One TALERT interrupt: Two sources
 103                  * If the interrupt is due to t_hot then mask t_hot and
 104                  * and unmask t_cold else mask t_cold and unmask t_hot
 105                  */
 106                 if (t_hot) {
 107                         ctrl &= ~tsr->mask_hot_mask;
 108                         ctrl |= tsr->mask_cold_mask;
 109                 } else if (t_cold) {
 110                         ctrl &= ~tsr->mask_cold_mask;
 111                         ctrl |= tsr->mask_hot_mask;
 112                 }
 113
 114                 omap_bandgap_writel(bg_ptr, ctrl, tsr->bgap_mask_ctrl);
 115
 116                 dev_dbg(bg_ptr->dev,
 117                         "%s: IRQ from %s sensor: hotevent %d coldevent %d\n",
 118                         __func__, bg_ptr->conf->sensors[i].domain,
 119                         t_hot, t_cold);
 120
 121                 /* read temperature */
 122                 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 123                 temp &= tsr->bgap_dtemp_mask;
 124
 125                 /* report temperature to whom may concern */
 126                 if (bg_ptr->conf->report_temperature)
 127                         bg_ptr->conf->report_temperature(bg_ptr, i);
 128         }
 129
 130         return IRQ_HANDLED;
 131 }
 132
 133 /* This is the Tshut handler. Call it only if HAS(TSHUT) is set */
 134 static irqreturn_t omap_bandgap_tshut_irq_handler(int irq, void *data)
 135 {
 136         orderly_poweroff(true);
 137
 138         return IRQ_HANDLED;
 139 }
 140
 141 static
 142 int adc_to_temp_conversion(struct omap_bandgap *bg_ptr, int id, int adc_val,
 143                            int *t)
 144 {
 145         struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
 146
 147         /* look up for temperature in the table and return the temperature */
 148         if (adc_val < ts_data->adc_start_val || adc_val > ts_data->adc_end_val)
 149                 return -ERANGE;
 150
 151         *t = bg_ptr->conv_table[adc_val - ts_data->adc_start_val];
 152
 153         return 0;
 154 }
 155
 156 static int temp_to_adc_conversion(long temp, struct omap_bandgap *bg_ptr, int i,
 157                                   int *adc)
 158 {
 159         struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[i].ts_data;
 160         int high, low, mid;
 161
 162         low = 0;
 163         high = ts_data->adc_end_val - ts_data->adc_start_val;
 164         mid = (high + low) / 2;
 165
 166         if (temp < bg_ptr->conv_table[low] || temp > bg_ptr->conv_table[high])
 167                 return -EINVAL;
 168
 169         while (low < high) {
 170                 if (temp < bg_ptr->conv_table[mid])
 171                         high = mid - 1;
 172                 else
 173                         low = mid + 1;
 174                 mid = (low + high) / 2;
 175         }
 176
 177         *adc = ts_data->adc_start_val + low;
 178
 179         return 0;
 180 }
 181
 182 /* Talert masks. Call it only if HAS(TALERT) is set */
 183 static int temp_sensor_unmask_interrupts(struct omap_bandgap *bg_ptr, int id,
 184                                          u32 t_hot, u32 t_cold)
 185 {
 186         struct temp_sensor_registers *tsr;
 187         u32 temp, reg_val;
 188
 189         /* Read the current on die temperature */
 190         tsr = bg_ptr->conf->sensors[id].registers;
 191         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 192         temp &= tsr->bgap_dtemp_mask;
 193
 194         reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
 195         if (temp < t_hot)
 196                 reg_val |= tsr->mask_hot_mask;
 197         else
 198                 reg_val &= ~tsr->mask_hot_mask;
 199
 200         if (t_cold < temp)
 201                 reg_val |= tsr->mask_cold_mask;
 202         else
 203                 reg_val &= ~tsr->mask_cold_mask;
 204         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
 205
 206         return 0;
 207 }
 208
 209 static
 210 int add_hyst(int adc_val, int hyst_val, struct omap_bandgap *bg_ptr, int i,
 211              u32 *sum)
 212 {
 213         int temp, ret;
 214
 215         ret = adc_to_temp_conversion(bg_ptr, i, adc_val, &temp);
 216         if (ret < 0)
 217                 return ret;
 218
 219         temp += hyst_val;
 220
 221         return temp_to_adc_conversion(temp, bg_ptr, i, sum);
 222 }
 223
 224 /* Talert Thot threshold. Call it only if HAS(TALERT) is set */
 225 static
 226 int temp_sensor_configure_thot(struct omap_bandgap *bg_ptr, int id, int t_hot)
 227 {
 228         struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
 229         struct temp_sensor_registers *tsr;
 230         u32 thresh_val, reg_val;
 231         int cold, err = 0;
 232
 233         tsr = bg_ptr->conf->sensors[id].registers;
 234
 235         /* obtain the T cold value */
 236         thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 237         cold = (thresh_val & tsr->threshold_tcold_mask) >>
 238             __ffs(tsr->threshold_tcold_mask);
 239         if (t_hot <= cold) {
 240                 /* change the t_cold to t_hot - 5000 millidegrees */
 241                 err |= add_hyst(t_hot, -ts_data->hyst_val, bg_ptr, id, &cold);
 242                 /* write the new t_cold value */
 243                 reg_val = thresh_val & (~tsr->threshold_tcold_mask);
 244                 reg_val |= cold << __ffs(tsr->threshold_tcold_mask);
 245                 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 246                 thresh_val = reg_val;
 247         }
 248
 249         /* write the new t_hot value */
 250         reg_val = thresh_val & ~tsr->threshold_thot_mask;
 251         reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
 252         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 253         if (err) {
 254                 dev_err(bg_ptr->dev, "failed to reprogram thot threshold\n");
 255                 return -EIO;
 256         }
 257
 258         return temp_sensor_unmask_interrupts(bg_ptr, id, t_hot, cold);
 259 }
 260
 261 /* Talert Thot and Tcold thresholds. Call it only if HAS(TALERT) is set */
 262 static
 263 int temp_sensor_init_talert_thresholds(struct omap_bandgap *bg_ptr, int id,
 264                                        int t_hot, int t_cold)
 265 {
 266         struct temp_sensor_registers *tsr;
 267         u32 reg_val, thresh_val;
 268
 269         tsr = bg_ptr->conf->sensors[id].registers;
 270         thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 271
 272         /* write the new t_cold value */
 273         reg_val = thresh_val & ~tsr->threshold_tcold_mask;
 274         reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
 275         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 276
 277         thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 278
 279         /* write the new t_hot value */
 280         reg_val = thresh_val & ~tsr->threshold_thot_mask;
 281         reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
 282         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 283
 284         reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
 285         reg_val |= tsr->mask_hot_mask;
 286         reg_val |= tsr->mask_cold_mask;
 287         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
 288
 289         return 0;
 290 }
 291
 292 /* Talert Tcold threshold. Call it only if HAS(TALERT) is set */
 293 static
 294 int temp_sensor_configure_tcold(struct omap_bandgap *bg_ptr, int id,
 295                                 int t_cold)
 296 {
 297         struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
 298         struct temp_sensor_registers *tsr;
 299         u32 thresh_val, reg_val;
 300         int hot, err = 0;
 301
 302         tsr = bg_ptr->conf->sensors[id].registers;
 303         /* obtain the T cold value */
 304         thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 305         hot = (thresh_val & tsr->threshold_thot_mask) >>
 306             __ffs(tsr->threshold_thot_mask);
 307
 308         if (t_cold >= hot) {
 309                 /* change the t_hot to t_cold + 5000 millidegrees */
 310                 err |= add_hyst(t_cold, ts_data->hyst_val, bg_ptr, id, &hot);
 311                 /* write the new t_hot value */
 312                 reg_val = thresh_val & (~tsr->threshold_thot_mask);
 313                 reg_val |= hot << __ffs(tsr->threshold_thot_mask);
 314                 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 315                 thresh_val = reg_val;
 316         }
 317
 318         /* write the new t_cold value */
 319         reg_val = thresh_val & ~tsr->threshold_tcold_mask;
 320         reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
 321         omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
 322         if (err) {
 323                 dev_err(bg_ptr->dev, "failed to reprogram tcold threshold\n");
 324                 return -EIO;
 325         }
 326
 327         return temp_sensor_unmask_interrupts(bg_ptr, id, hot, t_cold);
 328 }
 329
 330 /* This is Tshut Thot config. Call it only if HAS(TSHUT_CONFIG) is set */
 331 static int temp_sensor_configure_tshut_hot(struct omap_bandgap *bg_ptr,
 332                                            int id, int tshut_hot)
 333 {
 334         struct temp_sensor_registers *tsr;
 335         u32 reg_val;
 336
 337         tsr = bg_ptr->conf->sensors[id].registers;
 338         reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
 339         reg_val &= ~tsr->tshut_hot_mask;
 340         reg_val |= tshut_hot << __ffs(tsr->tshut_hot_mask);
 341         omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
 342
 343         return 0;
 344 }
 345
 346 /* This is Tshut Tcold config. Call it only if HAS(TSHUT_CONFIG) is set */
 347 static int temp_sensor_configure_tshut_cold(struct omap_bandgap *bg_ptr,
 348                                             int id, int tshut_cold)
 349 {
 350         struct temp_sensor_registers *tsr;
 351         u32 reg_val;
 352
 353         tsr = bg_ptr->conf->sensors[id].registers;
 354         reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
 355         reg_val &= ~tsr->tshut_cold_mask;
 356         reg_val |= tshut_cold << __ffs(tsr->tshut_cold_mask);
 357         omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
 358
 359         return 0;
 360 }
 361
 362 /* This is counter config. Call it only if HAS(COUNTER) is set */
 363 static int configure_temp_sensor_counter(struct omap_bandgap *bg_ptr, int id,
 364                                          u32 counter)
 365 {
 366         struct temp_sensor_registers *tsr;
 367         u32 val;
 368
 369         tsr = bg_ptr->conf->sensors[id].registers;
 370         val = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
 371         val &= ~tsr->counter_mask;
 372         val |= counter << __ffs(tsr->counter_mask);
 373         omap_bandgap_writel(bg_ptr, val, tsr->bgap_counter);
 374
 375         return 0;
 376 }
 377
 378 #define bandgap_is_valid(b)                                             \
 379                         (!IS_ERR_OR_NULL(b))
 380 #define bandgap_is_valid_sensor_id(b, i)                                \
 381                         ((i) >= 0 && (i) < (b)->conf->sensor_count)
 382 static inline int omap_bandgap_validate(struct omap_bandgap *bg_ptr, int id)
 383 {
 384         if (!bandgap_is_valid(bg_ptr)) {
 385                 pr_err("%s: invalid bandgap pointer\n", __func__);
 386                 return -EINVAL;
 387         }
 388
 389         if (!bandgap_is_valid_sensor_id(bg_ptr, id)) {
 390                 dev_err(bg_ptr->dev, "%s: sensor id out of range (%d)\n",
 391                         __func__, id);
 392                 return -ERANGE;
 393         }
 394
 395         return 0;
 396 }
 397
 398 /* Exposed APIs */
 399 /**
 400  * omap_bandgap_read_thot() - reads sensor current thot
 401  * @bg_ptr - pointer to bandgap instance
 402  * @id - sensor id
 403  * @thot - resulting current thot value
 404  *
 405  * returns 0 on success or the proper error code
 406  */
 407 int omap_bandgap_read_thot(struct omap_bandgap *bg_ptr, int id,
 408                               int *thot)
 409 {
 410         struct temp_sensor_registers *tsr;
 411         u32 temp;
 412         int ret;
 413
 414         ret = omap_bandgap_validate(bg_ptr, id);
 415         if (ret)
 416                 return ret;
 417
 418         if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 419                 return -ENOTSUPP;
 420
 421         tsr = bg_ptr->conf->sensors[id].registers;
 422         temp = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 423         temp = (temp & tsr->threshold_thot_mask) >>
 424                 __ffs(tsr->threshold_thot_mask);
 425         ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
 426         if (ret) {
 427                 dev_err(bg_ptr->dev, "failed to read thot\n");
 428                 return -EIO;
 429         }
 430
 431         *thot = temp;
 432
 433         return 0;
 434 }
 435
 436 /**
 437  * omap_bandgap_write_thot() - sets sensor current thot
 438  * @bg_ptr - pointer to bandgap instance
 439  * @id - sensor id
 440  * @val - desired thot value
 441  *
 442  * returns 0 on success or the proper error code
 443  */
 444 int omap_bandgap_write_thot(struct omap_bandgap *bg_ptr, int id, int val)
 445 {
 446         struct temp_sensor_data *ts_data;
 447         struct temp_sensor_registers *tsr;
 448         u32 t_hot;
 449         int ret;
 450
 451         ret = omap_bandgap_validate(bg_ptr, id);
 452         if (ret)
 453                 return ret;
 454
 455         if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 456                 return -ENOTSUPP;
 457
 458         ts_data = bg_ptr->conf->sensors[id].ts_data;
 459         tsr = bg_ptr->conf->sensors[id].registers;
 460
 461         if (val < ts_data->min_temp + ts_data->hyst_val)
 462                 return -EINVAL;
 463         ret = temp_to_adc_conversion(val, bg_ptr, id, &t_hot);
 464         if (ret < 0)
 465                 return ret;
 466
 467         mutex_lock(&bg_ptr->bg_mutex);
 468         temp_sensor_configure_thot(bg_ptr, id, t_hot);
 469         mutex_unlock(&bg_ptr->bg_mutex);
 470
 471         return 0;
 472 }
 473
 474 /**
 475  * omap_bandgap_read_tcold() - reads sensor current tcold
 476  * @bg_ptr - pointer to bandgap instance
 477  * @id - sensor id
 478  * @tcold - resulting current tcold value
 479  *
 480  * returns 0 on success or the proper error code
 481  */
 482 int omap_bandgap_read_tcold(struct omap_bandgap *bg_ptr, int id,
 483                                int *tcold)
 484 {
 485         struct temp_sensor_registers *tsr;
 486         u32 temp;
 487         int ret;
 488
 489         ret = omap_bandgap_validate(bg_ptr, id);
 490         if (ret)
 491                 return ret;
 492
 493         if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 494                 return -ENOTSUPP;
 495
 496         tsr = bg_ptr->conf->sensors[id].registers;
 497         temp = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
 498         temp = (temp & tsr->threshold_tcold_mask)
 499             >> __ffs(tsr->threshold_tcold_mask);
 500         ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
 501         if (ret)
 502                 return -EIO;
 503
 504         *tcold = temp;
 505
 506         return 0;
 507 }
 508
 509 /**
 510  * omap_bandgap_write_tcold() - sets the sensor tcold
 511  * @bg_ptr - pointer to bandgap instance
 512  * @id - sensor id
 513  * @val - desired tcold value
 514  *
 515  * returns 0 on success or the proper error code
 516  */
 517 int omap_bandgap_write_tcold(struct omap_bandgap *bg_ptr, int id, int val)
 518 {
 519         struct temp_sensor_data *ts_data;
 520         struct temp_sensor_registers *tsr;
 521         u32 t_cold;
 522         int ret;
 523
 524         ret = omap_bandgap_validate(bg_ptr, id);
 525         if (ret)
 526                 return ret;
 527
 528         if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 529                 return -ENOTSUPP;
 530
 531         ts_data = bg_ptr->conf->sensors[id].ts_data;
 532         tsr = bg_ptr->conf->sensors[id].registers;
 533         if (val > ts_data->max_temp + ts_data->hyst_val)
 534                 return -EINVAL;
 535
 536         ret = temp_to_adc_conversion(val, bg_ptr, id, &t_cold);
 537         if (ret < 0)
 538                 return ret;
 539
 540         mutex_lock(&bg_ptr->bg_mutex);
 541         temp_sensor_configure_tcold(bg_ptr, id, t_cold);
 542         mutex_unlock(&bg_ptr->bg_mutex);
 543
 544         return 0;
 545 }
 546
 547 /**
 548  * omap_bandgap_read_update_interval() - read the sensor update interval
 549  * @bg_ptr - pointer to bandgap instance
 550  * @id - sensor id
 551  * @interval - resulting update interval in miliseconds
 552  *
 553  * returns 0 on success or the proper error code
 554  */
 555 int omap_bandgap_read_update_interval(struct omap_bandgap *bg_ptr, int id,
 556                                          int *interval)
 557 {
 558         struct temp_sensor_registers *tsr;
 559         u32 time;
 560         int ret;
 561
 562         ret = omap_bandgap_validate(bg_ptr, id);
 563         if (ret)
 564                 return ret;
 565
 566         if (!OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
 567                 return -ENOTSUPP;
 568
 569         tsr = bg_ptr->conf->sensors[id].registers;
 570         time = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
 571         if (ret)
 572                 return ret;
 573         time = (time & tsr->counter_mask) >> __ffs(tsr->counter_mask);
 574         time = time * 1000 / bg_ptr->clk_rate;
 575
 576         *interval = time;
 577
 578         return 0;
 579 }
 580
 581 /**
 582  * omap_bandgap_write_update_interval() - set the update interval
 583  * @bg_ptr - pointer to bandgap instance
 584  * @id - sensor id
 585  * @interval - desired update interval in miliseconds
 586  *
 587  * returns 0 on success or the proper error code
 588  */
 589 int omap_bandgap_write_update_interval(struct omap_bandgap *bg_ptr,
 590                                           int id, u32 interval)
 591 {
 592         int ret = omap_bandgap_validate(bg_ptr, id);
 593         if (ret)
 594                 return ret;
 595
 596         if (!OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
 597                 return -ENOTSUPP;
 598
 599         interval = interval * bg_ptr->clk_rate / 1000;
 600         mutex_lock(&bg_ptr->bg_mutex);
 601         configure_temp_sensor_counter(bg_ptr, id, interval);
 602         mutex_unlock(&bg_ptr->bg_mutex);
 603
 604         return 0;
 605 }
 606
 607 /**
 608  * omap_bandgap_read_temperature() - report current temperature
 609  * @bg_ptr - pointer to bandgap instance
 610  * @id - sensor id
 611  * @temperature - resulting temperature
 612  *
 613  * returns 0 on success or the proper error code
 614  */
 615 int omap_bandgap_read_temperature(struct omap_bandgap *bg_ptr, int id,
 616                                      int *temperature)
 617 {
 618         struct temp_sensor_registers *tsr;
 619         u32 temp;
 620         int ret;
 621
 622         ret = omap_bandgap_validate(bg_ptr, id);
 623         if (ret)
 624                 return ret;
 625
 626         tsr = bg_ptr->conf->sensors[id].registers;
 627         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 628         temp &= tsr->bgap_dtemp_mask;
 629
 630         ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
 631         if (ret)
 632                 return -EIO;
 633
 634         *temperature = temp;
 635
 636         return 0;
 637 }
 638
 639 /**
 640  * omap_bandgap_set_sensor_data() - helper function to store thermal
 641  * framework related data.
 642  * @bg_ptr - pointer to bandgap instance
 643  * @id - sensor id
 644  * @data - thermal framework related data to be stored
 645  *
 646  * returns 0 on success or the proper error code
 647  */
 648 int omap_bandgap_set_sensor_data(struct omap_bandgap *bg_ptr, int id,
 649                                 void *data)
 650 {
 651         int ret = omap_bandgap_validate(bg_ptr, id);
 652         if (ret)
 653                 return ret;
 654
 655         bg_ptr->conf->sensors[id].data = data;
 656
 657         return 0;
 658 }
 659
 660 /**
 661  * omap_bandgap_get_sensor_data() - helper function to get thermal
 662  * framework related data.
 663  * @bg_ptr - pointer to bandgap instance
 664  * @id - sensor id
 665  *
 666  * returns data stored by set function with sensor id on success or NULL
 667  */
 668 void *omap_bandgap_get_sensor_data(struct omap_bandgap *bg_ptr, int id)
 669 {
 670         int ret = omap_bandgap_validate(bg_ptr, id);
 671         if (ret)
 672                 return ERR_PTR(ret);
 673
 674         return bg_ptr->conf->sensors[id].data;
 675 }
 676
 677 static int
 678 omap_bandgap_force_single_read(struct omap_bandgap *bg_ptr, int id)
 679 {
 680         struct temp_sensor_registers *tsr;
 681         u32 temp = 0, counter = 1000;
 682
 683         tsr = bg_ptr->conf->sensors[id].registers;
 684         /* Select single conversion mode */
 685         if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG)) {
 686                 temp = omap_bandgap_readl(bg_ptr, tsr->bgap_mode_ctrl);
 687                 temp &= ~(1 << __ffs(tsr->mode_ctrl_mask));
 688                 omap_bandgap_writel(bg_ptr, temp, tsr->bgap_mode_ctrl);
 689         }
 690
 691         /* Start of Conversion = 1 */
 692         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 693         temp |= 1 << __ffs(tsr->bgap_soc_mask);
 694         omap_bandgap_writel(bg_ptr, temp, tsr->temp_sensor_ctrl);
 695         /* Wait until DTEMP is updated */
 696         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 697         temp &= (tsr->bgap_dtemp_mask);
 698         while ((temp == 0) && --counter) {
 699                 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 700                 temp &= (tsr->bgap_dtemp_mask);
 701         }
 702         /* Start of Conversion = 0 */
 703         temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
 704         temp &= ~(1 << __ffs(tsr->bgap_soc_mask));
 705         omap_bandgap_writel(bg_ptr, temp, tsr->temp_sensor_ctrl);
 706
 707         return 0;
 708 }
 709
 710 /**
 711  * enable_continuous_mode() - One time enabling of continuous conversion mode
 712  * @bg_ptr - pointer to scm instance
 713  *
 714  * Call this function only if HAS(MODE_CONFIG) is set
 715  */
 716 static int enable_continuous_mode(struct omap_bandgap *bg_ptr)
 717 {
 718         struct temp_sensor_registers *tsr;
 719         int i;
 720         u32 val;
 721
 722         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
 723                 /* Perform a single read just before enabling continuous */
 724                 omap_bandgap_force_single_read(bg_ptr, i);
 725                 tsr = bg_ptr->conf->sensors[i].registers;
 726                 val = omap_bandgap_readl(bg_ptr, tsr->bgap_mode_ctrl);
 727                 val |= 1 << __ffs(tsr->mode_ctrl_mask);
 728                 omap_bandgap_writel(bg_ptr, val, tsr->bgap_mode_ctrl);
 729         }
 730
 731         return 0;
 732 }
 733
 734 static int omap_bandgap_tshut_init(struct omap_bandgap *bg_ptr,
 735                                       struct platform_device *pdev)
 736 {
 737         int gpio_nr = bg_ptr->tshut_gpio;
 738         int status;
 739
 740         /* Request for gpio_86 line */
 741         status = gpio_request(gpio_nr, "tshut");
 742         if (status < 0) {
 743                 dev_err(bg_ptr->dev,
 744                         "Could not request for TSHUT GPIO:%i\n", 86);
 745                 return status;
 746         }
 747         status = gpio_direction_input(gpio_nr);
 748         if (status) {
 749                 dev_err(bg_ptr->dev,
 750                         "Cannot set input TSHUT GPIO %d\n", gpio_nr);
 751                 return status;
 752         }
 753
 754         status = request_irq(gpio_to_irq(gpio_nr),
 755                              omap_bandgap_tshut_irq_handler,
 756                              IRQF_TRIGGER_RISING, "tshut",
 757                              NULL);
 758         if (status) {
 759                 gpio_free(gpio_nr);
 760                 dev_err(bg_ptr->dev, "request irq failed for TSHUT");
 761         }
 762
 763         return 0;
 764 }
 765
 766 /* Initialization of Talert. Call it only if HAS(TALERT) is set */
 767 static int omap_bandgap_talert_init(struct omap_bandgap *bg_ptr,
 768                                        struct platform_device *pdev)
 769 {
 770         int ret;
 771
 772         bg_ptr->irq = platform_get_irq(pdev, 0);
 773         if (bg_ptr->irq < 0) {
 774                 dev_err(&pdev->dev, "get_irq failed\n");
 775                 return bg_ptr->irq;
 776         }
 777         ret = request_threaded_irq(bg_ptr->irq, NULL,
 778                                    talert_irq_handler,
 779                                    IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 780                                    "talert", bg_ptr);
 781         if (ret) {
 782                 dev_err(&pdev->dev, "Request threaded irq failed.\n");
 783                 return ret;
 784         }
 785
 786         return 0;
 787 }
 788
 789 static const struct of_device_id of_omap_bandgap_match[];
 790 static struct omap_bandgap *omap_bandgap_build(struct platform_device *pdev)
 791 {
 792         struct device_node *node = pdev->dev.of_node;
 793         const struct of_device_id *of_id;
 794         struct omap_bandgap *bg_ptr;
 795         struct resource *res;
 796         u32 prop;
 797         int i;
 798
 799         /* just for the sake */
 800         if (!node) {
 801                 dev_err(&pdev->dev, "no platform information available\n");
 802                 return ERR_PTR(-EINVAL);
 803         }
 804
 805         bg_ptr = devm_kzalloc(&pdev->dev, sizeof(struct omap_bandgap),
 806                                     GFP_KERNEL);
 807         if (!bg_ptr) {
 808                 dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
 809                 return ERR_PTR(-ENOMEM);
 810         }
 811
 812         of_id = of_match_device(of_omap_bandgap_match, &pdev->dev);
 813         if (of_id)
 814                 bg_ptr->conf = of_id->data;
 815
 816         i = 0;
 817         do {
 818                 void __iomem *chunk;
 819
 820                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 821                 if (!res)
 822                         break;
 823                 chunk = devm_request_and_ioremap(&pdev->dev, res);
 824                 if (i == 0)
 825                         bg_ptr->base = chunk;
 826                 if (!chunk) {
 827                         dev_err(&pdev->dev,
 828                                 "failed to request the IO (%d:%pR).\n",
 829                                 i, res);
 830                         return ERR_PTR(-EADDRNOTAVAIL);
 831                 }
 832                 i++;
 833         } while (res);
 834
 835         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
 836                 if (of_property_read_u32(node, "ti,tshut-gpio", &prop) < 0) {
 837                         dev_err(&pdev->dev, "missing tshut gpio in device tree\n");
 838                         return ERR_PTR(-EINVAL);
 839                 }
 840                 bg_ptr->tshut_gpio = prop;
 841                 if (!gpio_is_valid(bg_ptr->tshut_gpio)) {
 842                         dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
 843                                 bg_ptr->tshut_gpio);
 844                         return ERR_PTR(-EINVAL);
 845                 }
 846         }
 847
 848         return bg_ptr;
 849 }
 850
 851 static
 852 int omap_bandgap_probe(struct platform_device *pdev)
 853 {
 854         struct omap_bandgap *bg_ptr;
 855         int clk_rate, ret = 0, i;
 856
 857         bg_ptr = omap_bandgap_build(pdev);
 858         if (IS_ERR_OR_NULL(bg_ptr)) {
 859                 dev_err(&pdev->dev, "failed to fetch platform data\n");
 860                 return PTR_ERR(bg_ptr);
 861         }
 862         bg_ptr->dev = &pdev->dev;
 863
 864         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
 865                 ret = omap_bandgap_tshut_init(bg_ptr, pdev);
 866                 if (ret) {
 867                         dev_err(&pdev->dev,
 868                                 "failed to initialize system tshut IRQ\n");
 869                         return ret;
 870                 }
 871         }
 872
 873         bg_ptr->fclock = clk_get(NULL, bg_ptr->conf->fclock_name);
 874         ret = IS_ERR_OR_NULL(bg_ptr->fclock);
 875         if (ret) {
 876                 dev_err(&pdev->dev, "failed to request fclock reference\n");
 877                 goto free_irqs;
 878         }
 879
 880         bg_ptr->div_clk = clk_get(NULL,  bg_ptr->conf->div_ck_name);
 881         ret = IS_ERR_OR_NULL(bg_ptr->div_clk);
 882         if (ret) {
 883                 dev_err(&pdev->dev,
 884                         "failed to request div_ts_ck clock ref\n");
 885                 goto free_irqs;
 886         }
 887
 888         bg_ptr->conv_table = bg_ptr->conf->conv_table;
 889         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
 890                 struct temp_sensor_registers *tsr;
 891                 u32 val;
 892
 893                 tsr = bg_ptr->conf->sensors[i].registers;
 894                 /*
 895                  * check if the efuse has a non-zero value if not
 896                  * it is an untrimmed sample and the temperatures
 897                  * may not be accurate
 898                  */
 899                 val = omap_bandgap_readl(bg_ptr, tsr->bgap_efuse);
 900                 if (ret || !val)
 901                         dev_info(&pdev->dev,
 902                                  "Non-trimmed BGAP, Temp not accurate\n");
 903         }
 904
 905         clk_rate = clk_round_rate(bg_ptr->div_clk,
 906                                   bg_ptr->conf->sensors[0].ts_data->max_freq);
 907         if (clk_rate < bg_ptr->conf->sensors[0].ts_data->min_freq ||
 908             clk_rate == 0xffffffff) {
 909                 ret = -ENODEV;
 910                 dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);
 911                 goto put_clks;
 912         }
 913
 914         ret = clk_set_rate(bg_ptr->div_clk, clk_rate);
 915         if (ret)
 916                 dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");
 917
 918         bg_ptr->clk_rate = clk_rate;
 919         clk_enable(bg_ptr->fclock);
 920
 921         mutex_init(&bg_ptr->bg_mutex);
 922         bg_ptr->dev = &pdev->dev;
 923         platform_set_drvdata(pdev, bg_ptr);
 924
 925         omap_bandgap_power(bg_ptr, true);
 926
 927         /* Set default counter to 1 for now */
 928         if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
 929                 for (i = 0; i < bg_ptr->conf->sensor_count; i++)
 930                         configure_temp_sensor_counter(bg_ptr, i, 1);
 931
 932         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
 933                 struct temp_sensor_data *ts_data;
 934
 935                 ts_data = bg_ptr->conf->sensors[i].ts_data;
 936
 937                 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT))
 938                         temp_sensor_init_talert_thresholds(bg_ptr, i,
 939                                                            ts_data->t_hot,
 940                                                            ts_data->t_cold);
 941                 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG)) {
 942                         temp_sensor_configure_tshut_hot(bg_ptr, i,
 943                                                         ts_data->tshut_hot);
 944                         temp_sensor_configure_tshut_cold(bg_ptr, i,
 945                                                          ts_data->tshut_cold);
 946                 }
 947         }
 948
 949         if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
 950                 enable_continuous_mode(bg_ptr);
 951
 952         /* Set .250 seconds time as default counter */
 953         if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
 954                 for (i = 0; i < bg_ptr->conf->sensor_count; i++)
 955                         configure_temp_sensor_counter(bg_ptr, i,
 956                                                       bg_ptr->clk_rate / 4);
 957
 958         /* Every thing is good? Then expose the sensors */
 959         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
 960                 char *domain;
 961
 962                 if (bg_ptr->conf->sensors[i].register_cooling)
 963                         bg_ptr->conf->sensors[i].register_cooling(bg_ptr, i);
 964
 965                 domain = bg_ptr->conf->sensors[i].domain;
 966                 if (bg_ptr->conf->expose_sensor)
 967                         bg_ptr->conf->expose_sensor(bg_ptr, i, domain);
 968         }
 969
 970         /*
 971          * Enable the Interrupts once everything is set. Otherwise irq handler
 972          * might be called as soon as it is enabled where as rest of framework
 973          * is still getting initialised.
 974          */
 975         if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
 976                 ret = omap_bandgap_talert_init(bg_ptr, pdev);
 977                 if (ret) {
 978                         dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");
 979                         i = bg_ptr->conf->sensor_count;
 980                         goto disable_clk;
 981                 }
 982         }
 983
 984         return 0;
 985
 986 disable_clk:
 987         clk_disable(bg_ptr->fclock);
 988 put_clks:
 989         clk_put(bg_ptr->fclock);
 990         clk_put(bg_ptr->div_clk);
 991 free_irqs:
 992         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
 993                 free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
 994                 gpio_free(bg_ptr->tshut_gpio);
 995         }
 996
 997         return ret;
 998 }
 999
1000 static
1001 int omap_bandgap_remove(struct platform_device *pdev)
1002 {
1003         struct omap_bandgap *bg_ptr = platform_get_drvdata(pdev);
1004         int i;
1005
1006         /* First thing is to remove sensor interfaces */
1007         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
1008                 if (bg_ptr->conf->sensors[i].register_cooling)
1009                         bg_ptr->conf->sensors[i].unregister_cooling(bg_ptr, i);
1010
1011                 if (bg_ptr->conf->remove_sensor)
1012                         bg_ptr->conf->remove_sensor(bg_ptr, i);
1013         }
1014
1015         omap_bandgap_power(bg_ptr, false);
1016
1017         clk_disable(bg_ptr->fclock);
1018         clk_put(bg_ptr->fclock);
1019         clk_put(bg_ptr->div_clk);
1020
1021         if (OMAP_BANDGAP_HAS(bg_ptr, TALERT))
1022                 free_irq(bg_ptr->irq, bg_ptr);
1023
1024         if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
1025                 free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
1026                 gpio_free(bg_ptr->tshut_gpio);
1027         }
1028
1029         return 0;
1030 }
1031
1032 #ifdef CONFIG_PM
1033 static int omap_bandgap_save_ctxt(struct omap_bandgap *bg_ptr)
1034 {
1035         int i;
1036
1037         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
1038                 struct temp_sensor_registers *tsr;
1039                 struct temp_sensor_regval *rval;
1040
1041                 rval = &bg_ptr->conf->sensors[i].regval;
1042                 tsr = bg_ptr->conf->sensors[i].registers;
1043
1044                 if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
1045                         rval->bg_mode_ctrl = omap_bandgap_readl(bg_ptr,
1046                                                         tsr->bgap_mode_ctrl);
1047                 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
1048                         rval->bg_counter = omap_bandgap_readl(bg_ptr,
1049                                                         tsr->bgap_counter);
1050                 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
1051                         rval->bg_threshold = omap_bandgap_readl(bg_ptr,
1052                                                         tsr->bgap_threshold);
1053                         rval->bg_ctrl = omap_bandgap_readl(bg_ptr,
1054                                                    tsr->bgap_mask_ctrl);
1055                 }
1056
1057                 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG))
1058                         rval->tshut_threshold = omap_bandgap_readl(bg_ptr,
1059                                                    tsr->tshut_threshold);
1060         }
1061
1062         return 0;
1063 }
1064
1065 static int omap_bandgap_restore_ctxt(struct omap_bandgap *bg_ptr)
1066 {
1067         int i;
1068
1069         for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
1070                 struct temp_sensor_registers *tsr;
1071                 struct temp_sensor_regval *rval;
1072                 u32 val = 0;
1073
1074                 rval = &bg_ptr->conf->sensors[i].regval;
1075                 tsr = bg_ptr->conf->sensors[i].registers;
1076
1077                 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
1078                         val = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
1079
1080                 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG))
1081                         omap_bandgap_writel(bg_ptr,
1082                                 rval->tshut_threshold,
1083                                            tsr->tshut_threshold);
1084                 /* Force immediate temperature measurement and update
1085                  * of the DTEMP field
1086                  */
1087                 omap_bandgap_force_single_read(bg_ptr, i);
1088
1089                 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
1090                         omap_bandgap_writel(bg_ptr, rval->bg_counter,
1091                                                    tsr->bgap_counter);
1092                 if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
1093                         omap_bandgap_writel(bg_ptr, rval->bg_mode_ctrl,
1094                                                    tsr->bgap_mode_ctrl);
1095                 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
1096                         omap_bandgap_writel(bg_ptr,
1097                                                    rval->bg_threshold,
1098                                                    tsr->bgap_threshold);
1099                         omap_bandgap_writel(bg_ptr, rval->bg_ctrl,
1100                                                    tsr->bgap_mask_ctrl);
1101                 }
1102         }
1103
1104         return 0;
1105 }
1106
1107 static int omap_bandgap_suspend(struct device *dev)
1108 {
1109         struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
1110         int err;
1111
1112         err = omap_bandgap_save_ctxt(bg_ptr);
1113         omap_bandgap_power(bg_ptr, false);
1114         clk_disable(bg_ptr->fclock);
1115
1116         return err;
1117 }
1118
1119 static int omap_bandgap_resume(struct device *dev)
1120 {
1121         struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
1122
1123         clk_enable(bg_ptr->fclock);
1124         omap_bandgap_power(bg_ptr, true);
1125
1126         return omap_bandgap_restore_ctxt(bg_ptr);
1127 }
1128 static const struct dev_pm_ops omap_bandgap_dev_pm_ops = {
1129         SET_SYSTEM_SLEEP_PM_OPS(omap_bandgap_suspend,
1130                                 omap_bandgap_resume)
1131 };
1132
1133 #define DEV_PM_OPS      (&omap_bandgap_dev_pm_ops)
1134 #else
1135 #define DEV_PM_OPS      NULL
1136 #endif
1137
1138 static const struct of_device_id of_omap_bandgap_match[] = {
1139 #ifdef CONFIG_OMAP4_THERMAL
1140         {
1141                 .compatible = "ti,omap4430-bandgap",
1142                 .data = (void *)&omap4430_data,
1143         },
1144         {
1145                 .compatible = "ti,omap4460-bandgap",
1146                 .data = (void *)&omap4460_data,
1147         },
1148         {
1149                 .compatible = "ti,omap4470-bandgap",
1150                 .data = (void *)&omap4470_data,
1151         },
1152 #endif
1153 #ifdef CONFIG_OMAP5_THERMAL
1154         {
1155                 .compatible = "ti,omap5430-bandgap",
1156                 .data = (void *)&omap5430_data,
1157         },
1158 #endif
1159         /* Sentinel */
1160         { },
1161 };
1162 MODULE_DEVICE_TABLE(of, of_omap_bandgap_match);
1163
1164 static struct platform_driver omap_bandgap_sensor_driver = {
1165         .probe = omap_bandgap_probe,
1166         .remove = omap_bandgap_remove,
1167         .driver = {
1168                         .name = "omap-bandgap",
1169                         .pm = DEV_PM_OPS,
1170                         .of_match_table = of_omap_bandgap_match,
1171         },
1172 };
1173
1174 module_platform_driver(omap_bandgap_sensor_driver);
1175
1176 MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver");
1177 MODULE_LICENSE("GPL v2");
1178 MODULE_ALIAS("platform:omap-bandgap");
1179 MODULE_AUTHOR("Texas Instrument Inc.");