drivers/opp/of.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic OPP OF helpers
   4  *
   5  * Copyright (C) 2009-2010 Texas Instruments Incorporated.
   6  *      Nishanth Menon
   7  *      Romit Dasgupta
   8  *      Kevin Hilman
   9  */
  10
  11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/cpu.h>
  14 #include <linux/errno.h>
  15 #include <linux/device.h>
  16 #include <linux/of_device.h>
  17 #include <linux/pm_domain.h>
  18 #include <linux/slab.h>
  19 #include <linux/export.h>
  20 #include <linux/energy_model.h>
  21
  22 #include "opp.h"
  23
  24 /*
  25  * Returns opp descriptor node for a device node, caller must
  26  * do of_node_put().
  27  */
  28 static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np,
  29                                                      int index)
  30 {
  31         /* "operating-points-v2" can be an array for power domain providers */
  32         return of_parse_phandle(np, "operating-points-v2", index);
  33 }
  34
  35 /* Returns opp descriptor node for a device, caller must do of_node_put() */
  36 struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
  37 {
  38         return _opp_of_get_opp_desc_node(dev->of_node, 0);
  39 }
  40 EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
  41
  42 struct opp_table *_managed_opp(struct device *dev, int index)
  43 {
  44         struct opp_table *opp_table, *managed_table = NULL;
  45         struct device_node *np;
  46
  47         np = _opp_of_get_opp_desc_node(dev->of_node, index);
  48         if (!np)
  49                 return NULL;
  50
  51         list_for_each_entry(opp_table, &opp_tables, node) {
  52                 if (opp_table->np == np) {
  53                         /*
  54                          * Multiple devices can point to the same OPP table and
  55                          * so will have same node-pointer, np.
  56                          *
  57                          * But the OPPs will be considered as shared only if the
  58                          * OPP table contains a "opp-shared" property.
  59                          */
  60                         if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
  61                                 _get_opp_table_kref(opp_table);
  62                                 managed_table = opp_table;
  63                         }
  64
  65                         break;
  66                 }
  67         }
  68
  69         of_node_put(np);
  70
  71         return managed_table;
  72 }
  73
  74 /* The caller must call dev_pm_opp_put() after the OPP is used */
  75 static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table,
  76                                           struct device_node *opp_np)
  77 {
  78         struct dev_pm_opp *opp;
  79
  80         mutex_lock(&opp_table->lock);
  81
  82         list_for_each_entry(opp, &opp_table->opp_list, node) {
  83                 if (opp->np == opp_np) {
  84                         dev_pm_opp_get(opp);
  85                         mutex_unlock(&opp_table->lock);
  86                         return opp;
  87                 }
  88         }
  89
  90         mutex_unlock(&opp_table->lock);
  91
  92         return NULL;
  93 }
  94
  95 static struct device_node *of_parse_required_opp(struct device_node *np,
  96                                                  int index)
  97 {
  98         struct device_node *required_np;
  99
 100         required_np = of_parse_phandle(np, "required-opps", index);
 101         if (unlikely(!required_np)) {
 102                 pr_err("%s: Unable to parse required-opps: %pOF, index: %d\n",
 103                        __func__, np, index);
 104         }
 105
 106         return required_np;
 107 }
 108
 109 /* The caller must call dev_pm_opp_put_opp_table() after the table is used */
 110 static struct opp_table *_find_table_of_opp_np(struct device_node *opp_np)
 111 {
 112         struct opp_table *opp_table;
 113         struct device_node *opp_table_np;
 114
 115         lockdep_assert_held(&opp_table_lock);
 116
 117         opp_table_np = of_get_parent(opp_np);
 118         if (!opp_table_np)
 119                 goto err;
 120
 121         /* It is safe to put the node now as all we need now is its address */
 122         of_node_put(opp_table_np);
 123
 124         list_for_each_entry(opp_table, &opp_tables, node) {
 125                 if (opp_table_np == opp_table->np) {
 126                         _get_opp_table_kref(opp_table);
 127                         return opp_table;
 128                 }
 129         }
 130
 131 err:
 132         return ERR_PTR(-ENODEV);
 133 }
 134
 135 /* Free resources previously acquired by _opp_table_alloc_required_tables() */
 136 static void _opp_table_free_required_tables(struct opp_table *opp_table)
 137 {
 138         struct opp_table **required_opp_tables = opp_table->required_opp_tables;
 139         int i;
 140
 141         if (!required_opp_tables)
 142                 return;
 143
 144         for (i = 0; i < opp_table->required_opp_count; i++) {
 145                 if (IS_ERR_OR_NULL(required_opp_tables[i]))
 146                         break;
 147
 148                 dev_pm_opp_put_opp_table(required_opp_tables[i]);
 149         }
 150
 151         kfree(required_opp_tables);
 152
 153         opp_table->required_opp_count = 0;
 154         opp_table->required_opp_tables = NULL;
 155 }
 156
 157 /*
 158  * Populate all devices and opp tables which are part of "required-opps" list.
 159  * Checking only the first OPP node should be enough.
 160  */
 161 static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
 162                                              struct device *dev,
 163                                              struct device_node *opp_np)
 164 {
 165         struct opp_table **required_opp_tables;
 166         struct device_node *required_np, *np;
 167         int count, i;
 168
 169         /* Traversing the first OPP node is all we need */
 170         np = of_get_next_available_child(opp_np, NULL);
 171         if (!np) {
 172                 dev_err(dev, "Empty OPP table\n");
 173                 return;
 174         }
 175
 176         count = of_count_phandle_with_args(np, "required-opps", NULL);
 177         if (!count)
 178                 goto put_np;
 179
 180         required_opp_tables = kcalloc(count, sizeof(*required_opp_tables),
 181                                       GFP_KERNEL);
 182         if (!required_opp_tables)
 183                 goto put_np;
 184
 185         opp_table->required_opp_tables = required_opp_tables;
 186         opp_table->required_opp_count = count;
 187
 188         for (i = 0; i < count; i++) {
 189                 required_np = of_parse_required_opp(np, i);
 190                 if (!required_np)
 191                         goto free_required_tables;
 192
 193                 required_opp_tables[i] = _find_table_of_opp_np(required_np);
 194                 of_node_put(required_np);
 195
 196                 if (IS_ERR(required_opp_tables[i]))
 197                         goto free_required_tables;
 198
 199                 /*
 200                  * We only support genpd's OPPs in the "required-opps" for now,
 201                  * as we don't know how much about other cases. Error out if the
 202                  * required OPP doesn't belong to a genpd.
 203                  */
 204                 if (!required_opp_tables[i]->is_genpd) {
 205                         dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n",
 206                                 required_np);
 207                         goto free_required_tables;
 208                 }
 209         }
 210
 211         goto put_np;
 212
 213 free_required_tables:
 214         _opp_table_free_required_tables(opp_table);
 215 put_np:
 216         of_node_put(np);
 217 }
 218
 219 void _of_init_opp_table(struct opp_table *opp_table, struct device *dev,
 220                         int index)
 221 {
 222         struct device_node *np, *opp_np;
 223         u32 val;
 224
 225         /*
 226          * Only required for backward compatibility with v1 bindings, but isn't
 227          * harmful for other cases. And so we do it unconditionally.
 228          */
 229         np = of_node_get(dev->of_node);
 230         if (!np)
 231                 return;
 232
 233         if (!of_property_read_u32(np, "clock-latency", &val))
 234                 opp_table->clock_latency_ns_max = val;
 235         of_property_read_u32(np, "voltage-tolerance",
 236                              &opp_table->voltage_tolerance_v1);
 237
 238         if (of_find_property(np, "#power-domain-cells", NULL))
 239                 opp_table->is_genpd = true;
 240
 241         /* Get OPP table node */
 242         opp_np = _opp_of_get_opp_desc_node(np, index);
 243         of_node_put(np);
 244
 245         if (!opp_np)
 246                 return;
 247
 248         if (of_property_read_bool(opp_np, "opp-shared"))
 249                 opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
 250         else
 251                 opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
 252
 253         opp_table->np = opp_np;
 254
 255         _opp_table_alloc_required_tables(opp_table, dev, opp_np);
 256         of_node_put(opp_np);
 257 }
 258
 259 void _of_clear_opp_table(struct opp_table *opp_table)
 260 {
 261         _opp_table_free_required_tables(opp_table);
 262 }
 263
 264 /*
 265  * Release all resources previously acquired with a call to
 266  * _of_opp_alloc_required_opps().
 267  */
 268 void _of_opp_free_required_opps(struct opp_table *opp_table,
 269                                 struct dev_pm_opp *opp)
 270 {
 271         struct dev_pm_opp **required_opps = opp->required_opps;
 272         int i;
 273
 274         if (!required_opps)
 275                 return;
 276
 277         for (i = 0; i < opp_table->required_opp_count; i++) {
 278                 if (!required_opps[i])
 279                         break;
 280
 281                 /* Put the reference back */
 282                 dev_pm_opp_put(required_opps[i]);
 283         }
 284
 285         kfree(required_opps);
 286         opp->required_opps = NULL;
 287 }
 288
 289 /* Populate all required OPPs which are part of "required-opps" list */
 290 static int _of_opp_alloc_required_opps(struct opp_table *opp_table,
 291                                        struct dev_pm_opp *opp)
 292 {
 293         struct dev_pm_opp **required_opps;
 294         struct opp_table *required_table;
 295         struct device_node *np;
 296         int i, ret, count = opp_table->required_opp_count;
 297
 298         if (!count)
 299                 return 0;
 300
 301         required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL);
 302         if (!required_opps)
 303                 return -ENOMEM;
 304
 305         opp->required_opps = required_opps;
 306
 307         for (i = 0; i < count; i++) {
 308                 required_table = opp_table->required_opp_tables[i];
 309
 310                 np = of_parse_required_opp(opp->np, i);
 311                 if (unlikely(!np)) {
 312                         ret = -ENODEV;
 313                         goto free_required_opps;
 314                 }
 315
 316                 required_opps[i] = _find_opp_of_np(required_table, np);
 317                 of_node_put(np);
 318
 319                 if (!required_opps[i]) {
 320                         pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
 321                                __func__, opp->np, i);
 322                         ret = -ENODEV;
 323                         goto free_required_opps;
 324                 }
 325         }
 326
 327         return 0;
 328
 329 free_required_opps:
 330         _of_opp_free_required_opps(opp_table, opp);
 331
 332         return ret;
 333 }
 334
 335 static int _bandwidth_supported(struct device *dev, struct opp_table *opp_table)
 336 {
 337         struct device_node *np, *opp_np;
 338         struct property *prop;
 339
 340         if (!opp_table) {
 341                 np = of_node_get(dev->of_node);
 342                 if (!np)
 343                         return -ENODEV;
 344
 345                 opp_np = _opp_of_get_opp_desc_node(np, 0);
 346                 of_node_put(np);
 347         } else {
 348                 opp_np = of_node_get(opp_table->np);
 349         }
 350
 351         /* Lets not fail in case we are parsing opp-v1 bindings */
 352         if (!opp_np)
 353                 return 0;
 354
 355         /* Checking only first OPP is sufficient */
 356         np = of_get_next_available_child(opp_np, NULL);
 357         if (!np) {
 358                 dev_err(dev, "OPP table empty\n");
 359                 return -EINVAL;
 360         }
 361         of_node_put(opp_np);
 362
 363         prop = of_find_property(np, "opp-peak-kBps", NULL);
 364         of_node_put(np);
 365
 366         if (!prop || !prop->length)
 367                 return 0;
 368
 369         return 1;
 370 }
 371
 372 int dev_pm_opp_of_find_icc_paths(struct device *dev,
 373                                  struct opp_table *opp_table)
 374 {
 375         struct device_node *np;
 376         int ret, i, count, num_paths;
 377         struct icc_path **paths;
 378
 379         ret = _bandwidth_supported(dev, opp_table);
 380         if (ret <= 0)
 381                 return ret;
 382
 383         ret = 0;
 384
 385         np = of_node_get(dev->of_node);
 386         if (!np)
 387                 return 0;
 388
 389         count = of_count_phandle_with_args(np, "interconnects",
 390                                            "#interconnect-cells");
 391         of_node_put(np);
 392         if (count < 0)
 393                 return 0;
 394
 395         /* two phandles when #interconnect-cells = <1> */
 396         if (count % 2) {
 397                 dev_err(dev, "%s: Invalid interconnects values\n", __func__);
 398                 return -EINVAL;
 399         }
 400
 401         num_paths = count / 2;
 402         paths = kcalloc(num_paths, sizeof(*paths), GFP_KERNEL);
 403         if (!paths)
 404                 return -ENOMEM;
 405
 406         for (i = 0; i < num_paths; i++) {
 407                 paths[i] = of_icc_get_by_index(dev, i);
 408                 if (IS_ERR(paths[i])) {
 409                         ret = PTR_ERR(paths[i]);
 410                         if (ret != -EPROBE_DEFER) {
 411                                 dev_err(dev, "%s: Unable to get path%d: %d\n",
 412                                         __func__, i, ret);
 413                         }
 414                         goto err;
 415                 }
 416         }
 417
 418         if (opp_table) {
 419                 opp_table->paths = paths;
 420                 opp_table->path_count = num_paths;
 421                 return 0;
 422         }
 423
 424 err:
 425         while (i--)
 426                 icc_put(paths[i]);
 427
 428         kfree(paths);
 429
 430         return ret;
 431 }
 432 EXPORT_SYMBOL_GPL(dev_pm_opp_of_find_icc_paths);
 433
 434 static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
 435                               struct device_node *np)
 436 {
 437         unsigned int levels = opp_table->supported_hw_count;
 438         int count, versions, ret, i, j;
 439         u32 val;
 440
 441         if (!opp_table->supported_hw) {
 442                 /*
 443                  * In the case that no supported_hw has been set by the
 444                  * platform but there is an opp-supported-hw value set for
 445                  * an OPP then the OPP should not be enabled as there is
 446                  * no way to see if the hardware supports it.
 447                  */
 448                 if (of_find_property(np, "opp-supported-hw", NULL))
 449                         return false;
 450                 else
 451                         return true;
 452         }
 453
 454         count = of_property_count_u32_elems(np, "opp-supported-hw");
 455         if (count <= 0 || count % levels) {
 456                 dev_err(dev, "%s: Invalid opp-supported-hw property (%d)\n",
 457                         __func__, count);
 458                 return false;
 459         }
 460
 461         versions = count / levels;
 462
 463         /* All levels in at least one of the versions should match */
 464         for (i = 0; i < versions; i++) {
 465                 bool supported = true;
 466
 467                 for (j = 0; j < levels; j++) {
 468                         ret = of_property_read_u32_index(np, "opp-supported-hw",
 469                                                          i * levels + j, &val);
 470                         if (ret) {
 471                                 dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
 472                                          __func__, i * levels + j, ret);
 473                                 return false;
 474                         }
 475
 476                         /* Check if the level is supported */
 477                         if (!(val & opp_table->supported_hw[j])) {
 478                                 supported = false;
 479                                 break;
 480                         }
 481                 }
 482
 483                 if (supported)
 484                         return true;
 485         }
 486
 487         return false;
 488 }
 489
 490 static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
 491                               struct opp_table *opp_table)
 492 {
 493         u32 *microvolt, *microamp = NULL;
 494         int supplies = opp_table->regulator_count, vcount, icount, ret, i, j;
 495         struct property *prop = NULL;
 496         char name[NAME_MAX];
 497
 498         /* Search for "opp-microvolt-<name>" */
 499         if (opp_table->prop_name) {
 500                 snprintf(name, sizeof(name), "opp-microvolt-%s",
 501                          opp_table->prop_name);
 502                 prop = of_find_property(opp->np, name, NULL);
 503         }
 504
 505         if (!prop) {
 506                 /* Search for "opp-microvolt" */
 507                 sprintf(name, "opp-microvolt");
 508                 prop = of_find_property(opp->np, name, NULL);
 509
 510                 /* Missing property isn't a problem, but an invalid entry is */
 511                 if (!prop) {
 512                         if (unlikely(supplies == -1)) {
 513                                 /* Initialize regulator_count */
 514                                 opp_table->regulator_count = 0;
 515                                 return 0;
 516                         }
 517
 518                         if (!supplies)
 519                                 return 0;
 520
 521                         dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
 522                                 __func__);
 523                         return -EINVAL;
 524                 }
 525         }
 526
 527         if (unlikely(supplies == -1)) {
 528                 /* Initialize regulator_count */
 529                 supplies = opp_table->regulator_count = 1;
 530         } else if (unlikely(!supplies)) {
 531                 dev_err(dev, "%s: opp-microvolt wasn't expected\n", __func__);
 532                 return -EINVAL;
 533         }
 534
 535         vcount = of_property_count_u32_elems(opp->np, name);
 536         if (vcount < 0) {
 537                 dev_err(dev, "%s: Invalid %s property (%d)\n",
 538                         __func__, name, vcount);
 539                 return vcount;
 540         }
 541
 542         /* There can be one or three elements per supply */
 543         if (vcount != supplies && vcount != supplies * 3) {
 544                 dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
 545                         __func__, name, vcount, supplies);
 546                 return -EINVAL;
 547         }
 548
 549         microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL);
 550         if (!microvolt)
 551                 return -ENOMEM;
 552
 553         ret = of_property_read_u32_array(opp->np, name, microvolt, vcount);
 554         if (ret) {
 555                 dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
 556                 ret = -EINVAL;
 557                 goto free_microvolt;
 558         }
 559
 560         /* Search for "opp-microamp-<name>" */
 561         prop = NULL;
 562         if (opp_table->prop_name) {
 563                 snprintf(name, sizeof(name), "opp-microamp-%s",
 564                          opp_table->prop_name);
 565                 prop = of_find_property(opp->np, name, NULL);
 566         }
 567
 568         if (!prop) {
 569                 /* Search for "opp-microamp" */
 570                 sprintf(name, "opp-microamp");
 571                 prop = of_find_property(opp->np, name, NULL);
 572         }
 573
 574         if (prop) {
 575                 icount = of_property_count_u32_elems(opp->np, name);
 576                 if (icount < 0) {
 577                         dev_err(dev, "%s: Invalid %s property (%d)\n", __func__,
 578                                 name, icount);
 579                         ret = icount;
 580                         goto free_microvolt;
 581                 }
 582
 583                 if (icount != supplies) {
 584                         dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
 585                                 __func__, name, icount, supplies);
 586                         ret = -EINVAL;
 587                         goto free_microvolt;
 588                 }
 589
 590                 microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL);
 591                 if (!microamp) {
 592                         ret = -EINVAL;
 593                         goto free_microvolt;
 594                 }
 595
 596                 ret = of_property_read_u32_array(opp->np, name, microamp,
 597                                                  icount);
 598                 if (ret) {
 599                         dev_err(dev, "%s: error parsing %s: %d\n", __func__,
 600                                 name, ret);
 601                         ret = -EINVAL;
 602                         goto free_microamp;
 603                 }
 604         }
 605
 606         for (i = 0, j = 0; i < supplies; i++) {
 607                 opp->supplies[i].u_volt = microvolt[j++];
 608
 609                 if (vcount == supplies) {
 610                         opp->supplies[i].u_volt_min = opp->supplies[i].u_volt;
 611                         opp->supplies[i].u_volt_max = opp->supplies[i].u_volt;
 612                 } else {
 613                         opp->supplies[i].u_volt_min = microvolt[j++];
 614                         opp->supplies[i].u_volt_max = microvolt[j++];
 615                 }
 616
 617                 if (microamp)
 618                         opp->supplies[i].u_amp = microamp[i];
 619         }
 620
 621 free_microamp:
 622         kfree(microamp);
 623 free_microvolt:
 624         kfree(microvolt);
 625
 626         return ret;
 627 }
 628
 629 /**
 630  * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
 631  *                                entries
 632  * @dev:        device pointer used to lookup OPP table.
 633  *
 634  * Free OPPs created using static entries present in DT.
 635  */
 636 void dev_pm_opp_of_remove_table(struct device *dev)
 637 {
 638         dev_pm_opp_remove_table(dev);
 639 }
 640 EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
 641
 642 static int _read_bw(struct dev_pm_opp *new_opp, struct opp_table *table,
 643                     struct device_node *np, bool peak)
 644 {
 645         const char *name = peak ? "opp-peak-kBps" : "opp-avg-kBps";
 646         struct property *prop;
 647         int i, count, ret;
 648         u32 *bw;
 649
 650         prop = of_find_property(np, name, NULL);
 651         if (!prop)
 652                 return -ENODEV;
 653
 654         count = prop->length / sizeof(u32);
 655         if (table->path_count != count) {
 656                 pr_err("%s: Mismatch between %s and paths (%d %d)\n",
 657                                 __func__, name, count, table->path_count);
 658                 return -EINVAL;
 659         }
 660
 661         bw = kmalloc_array(count, sizeof(*bw), GFP_KERNEL);
 662         if (!bw)
 663                 return -ENOMEM;
 664
 665         ret = of_property_read_u32_array(np, name, bw, count);
 666         if (ret) {
 667                 pr_err("%s: Error parsing %s: %d\n", __func__, name, ret);
 668                 goto out;
 669         }
 670
 671         for (i = 0; i < count; i++) {
 672                 if (peak)
 673                         new_opp->bandwidth[i].peak = kBps_to_icc(bw[i]);
 674                 else
 675                         new_opp->bandwidth[i].avg = kBps_to_icc(bw[i]);
 676         }
 677
 678 out:
 679         kfree(bw);
 680         return ret;
 681 }
 682
 683 static int _read_opp_key(struct dev_pm_opp *new_opp, struct opp_table *table,
 684                          struct device_node *np, bool *rate_not_available)
 685 {
 686         bool found = false;
 687         u64 rate;
 688         int ret;
 689
 690         ret = of_property_read_u64(np, "opp-hz", &rate);
 691         if (!ret) {
 692                 /*
 693                  * Rate is defined as an unsigned long in clk API, and so
 694                  * casting explicitly to its type. Must be fixed once rate is 64
 695                  * bit guaranteed in clk API.
 696                  */
 697                 new_opp->rate = (unsigned long)rate;
 698                 found = true;
 699         }
 700         *rate_not_available = !!ret;
 701
 702         /*
 703          * Bandwidth consists of peak and average (optional) values:
 704          * opp-peak-kBps = <path1_value path2_value>;
 705          * opp-avg-kBps = <path1_value path2_value>;
 706          */
 707         ret = _read_bw(new_opp, table, np, true);
 708         if (!ret) {
 709                 found = true;
 710                 ret = _read_bw(new_opp, table, np, false);
 711         }
 712
 713         /* The properties were found but we failed to parse them */
 714         if (ret && ret != -ENODEV)
 715                 return ret;
 716
 717         if (!of_property_read_u32(np, "opp-level", &new_opp->level))
 718                 found = true;
 719
 720         if (found)
 721                 return 0;
 722
 723         return ret;
 724 }
 725
 726 /**
 727  * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
 728  * @opp_table:  OPP table
 729  * @dev:        device for which we do this operation
 730  * @np:         device node
 731  *
 732  * This function adds an opp definition to the opp table and returns status. The
 733  * opp can be controlled using dev_pm_opp_enable/disable functions and may be
 734  * removed by dev_pm_opp_remove.
 735  *
 736  * Return:
 737  * Valid OPP pointer:
 738  *              On success
 739  * NULL:
 740  *              Duplicate OPPs (both freq and volt are same) and opp->available
 741  *              OR if the OPP is not supported by hardware.
 742  * ERR_PTR(-EEXIST):
 743  *              Freq are same and volt are different OR
 744  *              Duplicate OPPs (both freq and volt are same) and !opp->available
 745  * ERR_PTR(-ENOMEM):
 746  *              Memory allocation failure
 747  * ERR_PTR(-EINVAL):
 748  *              Failed parsing the OPP node
 749  */
 750 static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
 751                 struct device *dev, struct device_node *np)
 752 {
 753         struct dev_pm_opp *new_opp;
 754         u64 rate = 0;
 755         u32 val;
 756         int ret;
 757         bool rate_not_available = false;
 758
 759         new_opp = _opp_allocate(opp_table);
 760         if (!new_opp)
 761                 return ERR_PTR(-ENOMEM);
 762
 763         ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available);
 764         if (ret < 0 && !opp_table->is_genpd) {
 765                 dev_err(dev, "%s: opp key field not found\n", __func__);
 766                 goto free_opp;
 767         }
 768
 769         /* Check if the OPP supports hardware's hierarchy of versions or not */
 770         if (!_opp_is_supported(dev, opp_table, np)) {
 771                 dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
 772                 goto free_opp;
 773         }
 774
 775         new_opp->turbo = of_property_read_bool(np, "turbo-mode");
 776
 777         new_opp->np = np;
 778         new_opp->dynamic = false;
 779         new_opp->available = true;
 780
 781         ret = _of_opp_alloc_required_opps(opp_table, new_opp);
 782         if (ret)
 783                 goto free_opp;
 784
 785         if (!of_property_read_u32(np, "clock-latency-ns", &val))
 786                 new_opp->clock_latency_ns = val;
 787
 788         ret = opp_parse_supplies(new_opp, dev, opp_table);
 789         if (ret)
 790                 goto free_required_opps;
 791
 792         if (opp_table->is_genpd)
 793                 new_opp->pstate = pm_genpd_opp_to_performance_state(dev, new_opp);
 794
 795         ret = _opp_add(dev, new_opp, opp_table, rate_not_available);
 796         if (ret) {
 797                 /* Don't return error for duplicate OPPs */
 798                 if (ret == -EBUSY)
 799                         ret = 0;
 800                 goto free_required_opps;
 801         }
 802
 803         /* OPP to select on device suspend */
 804         if (of_property_read_bool(np, "opp-suspend")) {
 805                 if (opp_table->suspend_opp) {
 806                         /* Pick the OPP with higher rate as suspend OPP */
 807                         if (new_opp->rate > opp_table->suspend_opp->rate) {
 808                                 opp_table->suspend_opp->suspend = false;
 809                                 new_opp->suspend = true;
 810                                 opp_table->suspend_opp = new_opp;
 811                         }
 812                 } else {
 813                         new_opp->suspend = true;
 814                         opp_table->suspend_opp = new_opp;
 815                 }
 816         }
 817
 818         if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
 819                 opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
 820
 821         pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
 822                  __func__, new_opp->turbo, new_opp->rate,
 823                  new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
 824                  new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns);
 825
 826         /*
 827          * Notify the changes in the availability of the operable
 828          * frequency/voltage list.
 829          */
 830         blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
 831         return new_opp;
 832
 833 free_required_opps:
 834         _of_opp_free_required_opps(opp_table, new_opp);
 835 free_opp:
 836         _opp_free(new_opp);
 837
 838         return ERR_PTR(ret);
 839 }
 840
 841 /* Initializes OPP tables based on new bindings */
 842 static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table)
 843 {
 844         struct device_node *np;
 845         int ret, count = 0;
 846         struct dev_pm_opp *opp;
 847
 848         /* OPP table is already initialized for the device */
 849         mutex_lock(&opp_table->lock);
 850         if (opp_table->parsed_static_opps) {
 851                 opp_table->parsed_static_opps++;
 852                 mutex_unlock(&opp_table->lock);
 853                 return 0;
 854         }
 855
 856         opp_table->parsed_static_opps = 1;
 857         mutex_unlock(&opp_table->lock);
 858
 859         /* We have opp-table node now, iterate over it and add OPPs */
 860         for_each_available_child_of_node(opp_table->np, np) {
 861                 opp = _opp_add_static_v2(opp_table, dev, np);
 862                 if (IS_ERR(opp)) {
 863                         ret = PTR_ERR(opp);
 864                         dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
 865                                 ret);
 866                         of_node_put(np);
 867                         goto remove_static_opp;
 868                 } else if (opp) {
 869                         count++;
 870                 }
 871         }
 872
 873         /* There should be one of more OPP defined */
 874         if (WARN_ON(!count)) {
 875                 ret = -ENOENT;
 876                 goto remove_static_opp;
 877         }
 878
 879         list_for_each_entry(opp, &opp_table->opp_list, node) {
 880                 /* Any non-zero performance state would enable the feature */
 881                 if (opp->pstate) {
 882                         opp_table->genpd_performance_state = true;
 883                         break;
 884                 }
 885         }
 886
 887         return 0;
 888
 889 remove_static_opp:
 890         _opp_remove_all_static(opp_table);
 891
 892         return ret;
 893 }
 894
 895 /* Initializes OPP tables based on old-deprecated bindings */
 896 static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table)
 897 {
 898         const struct property *prop;
 899         const __be32 *val;
 900         int nr, ret = 0;
 901
 902         mutex_lock(&opp_table->lock);
 903         if (opp_table->parsed_static_opps) {
 904                 opp_table->parsed_static_opps++;
 905                 mutex_unlock(&opp_table->lock);
 906                 return 0;
 907         }
 908
 909         opp_table->parsed_static_opps = 1;
 910         mutex_unlock(&opp_table->lock);
 911
 912         prop = of_find_property(dev->of_node, "operating-points", NULL);
 913         if (!prop) {
 914                 ret = -ENODEV;
 915                 goto remove_static_opp;
 916         }
 917         if (!prop->value) {
 918                 ret = -ENODATA;
 919                 goto remove_static_opp;
 920         }
 921
 922         /*
 923          * Each OPP is a set of tuples consisting of frequency and
 924          * voltage like <freq-kHz vol-uV>.
 925          */
 926         nr = prop->length / sizeof(u32);
 927         if (nr % 2) {
 928                 dev_err(dev, "%s: Invalid OPP table\n", __func__);
 929                 ret = -EINVAL;
 930                 goto remove_static_opp;
 931         }
 932
 933         val = prop->value;
 934         while (nr) {
 935                 unsigned long freq = be32_to_cpup(val++) * 1000;
 936                 unsigned long volt = be32_to_cpup(val++);
 937
 938                 ret = _opp_add_v1(opp_table, dev, freq, volt, false);
 939                 if (ret) {
 940                         dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
 941                                 __func__, freq, ret);
 942                         goto remove_static_opp;
 943                 }
 944                 nr -= 2;
 945         }
 946
 947 remove_static_opp:
 948         _opp_remove_all_static(opp_table);
 949
 950         return ret;
 951 }
 952
 953 /**
 954  * dev_pm_opp_of_add_table() - Initialize opp table from device tree
 955  * @dev:        device pointer used to lookup OPP table.
 956  *
 957  * Register the initial OPP table with the OPP library for given device.
 958  *
 959  * Return:
 960  * 0            On success OR
 961  *              Duplicate OPPs (both freq and volt are same) and opp->available
 962  * -EEXIST      Freq are same and volt are different OR
 963  *              Duplicate OPPs (both freq and volt are same) and !opp->available
 964  * -ENOMEM      Memory allocation failure
 965  * -ENODEV      when 'operating-points' property is not found or is invalid data
 966  *              in device node.
 967  * -ENODATA     when empty 'operating-points' property is found
 968  * -EINVAL      when invalid entries are found in opp-v2 table
 969  */
 970 int dev_pm_opp_of_add_table(struct device *dev)
 971 {
 972         struct opp_table *opp_table;
 973         int ret;
 974
 975         opp_table = dev_pm_opp_get_opp_table_indexed(dev, 0);
 976         if (IS_ERR(opp_table))
 977                 return PTR_ERR(opp_table);
 978
 979         /*
 980          * OPPs have two version of bindings now. Also try the old (v1)
 981          * bindings for backward compatibility with older dtbs.
 982          */
 983         if (opp_table->np)
 984                 ret = _of_add_opp_table_v2(dev, opp_table);
 985         else
 986                 ret = _of_add_opp_table_v1(dev, opp_table);
 987
 988         if (ret)
 989                 dev_pm_opp_put_opp_table(opp_table);
 990
 991         return ret;
 992 }
 993 EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
 994
 995 /**
 996  * dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree
 997  * @dev:        device pointer used to lookup OPP table.
 998  * @index:      Index number.
 999  *
1000  * Register the initial OPP table with the OPP library for given device only
1001  * using the "operating-points-v2" property.
1002  *
1003  * Return:
1004  * 0            On success OR
1005  *              Duplicate OPPs (both freq and volt are same) and opp->available
1006  * -EEXIST      Freq are same and volt are different OR
1007  *              Duplicate OPPs (both freq and volt are same) and !opp->available
1008  * -ENOMEM      Memory allocation failure
1009  * -ENODEV      when 'operating-points' property is not found or is invalid data
1010  *              in device node.
1011  * -ENODATA     when empty 'operating-points' property is found
1012  * -EINVAL      when invalid entries are found in opp-v2 table
1013  */
1014 int dev_pm_opp_of_add_table_indexed(struct device *dev, int index)
1015 {
1016         struct opp_table *opp_table;
1017         int ret, count;
1018
1019         if (index) {
1020                 /*
1021                  * If only one phandle is present, then the same OPP table
1022                  * applies for all index requests.
1023                  */
1024                 count = of_count_phandle_with_args(dev->of_node,
1025                                                    "operating-points-v2", NULL);
1026                 if (count == 1)
1027                         index = 0;
1028         }
1029
1030         opp_table = dev_pm_opp_get_opp_table_indexed(dev, index);
1031         if (IS_ERR(opp_table))
1032                 return PTR_ERR(opp_table);
1033
1034         ret = _of_add_opp_table_v2(dev, opp_table);
1035         if (ret)
1036                 dev_pm_opp_put_opp_table(opp_table);
1037
1038         return ret;
1039 }
1040 EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed);
1041
1042 /* CPU device specific helpers */
1043
1044 /**
1045  * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask
1046  * @cpumask:    cpumask for which OPP table needs to be removed
1047  *
1048  * This removes the OPP tables for CPUs present in the @cpumask.
1049  * This should be used only to remove static entries created from DT.
1050  */
1051 void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
1052 {
1053         _dev_pm_opp_cpumask_remove_table(cpumask, -1);
1054 }
1055 EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
1056
1057 /**
1058  * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask
1059  * @cpumask:    cpumask for which OPP table needs to be added.
1060  *
1061  * This adds the OPP tables for CPUs present in the @cpumask.
1062  */
1063 int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
1064 {
1065         struct device *cpu_dev;
1066         int cpu, ret;
1067
1068         if (WARN_ON(cpumask_empty(cpumask)))
1069                 return -ENODEV;
1070
1071         for_each_cpu(cpu, cpumask) {
1072                 cpu_dev = get_cpu_device(cpu);
1073                 if (!cpu_dev) {
1074                         pr_err("%s: failed to get cpu%d device\n", __func__,
1075                                cpu);
1076                         ret = -ENODEV;
1077                         goto remove_table;
1078                 }
1079
1080                 ret = dev_pm_opp_of_add_table(cpu_dev);
1081                 if (ret) {
1082                         /*
1083                          * OPP may get registered dynamically, don't print error
1084                          * message here.
1085                          */
1086                         pr_debug("%s: couldn't find opp table for cpu:%d, %d\n",
1087                                  __func__, cpu, ret);
1088
1089                         goto remove_table;
1090                 }
1091         }
1092
1093         return 0;
1094
1095 remove_table:
1096         /* Free all other OPPs */
1097         _dev_pm_opp_cpumask_remove_table(cpumask, cpu);
1098
1099         return ret;
1100 }
1101 EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
1102
1103 /*
1104  * Works only for OPP v2 bindings.
1105  *
1106  * Returns -ENOENT if operating-points-v2 bindings aren't supported.
1107  */
1108 /**
1109  * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with
1110  *                                    @cpu_dev using operating-points-v2
1111  *                                    bindings.
1112  *
1113  * @cpu_dev:    CPU device for which we do this operation
1114  * @cpumask:    cpumask to update with information of sharing CPUs
1115  *
1116  * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
1117  *
1118  * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev.
1119  */
1120 int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
1121                                    struct cpumask *cpumask)
1122 {
1123         struct device_node *np, *tmp_np, *cpu_np;
1124         int cpu, ret = 0;
1125
1126         /* Get OPP descriptor node */
1127         np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
1128         if (!np) {
1129                 dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__);
1130                 return -ENOENT;
1131         }
1132
1133         cpumask_set_cpu(cpu_dev->id, cpumask);
1134
1135         /* OPPs are shared ? */
1136         if (!of_property_read_bool(np, "opp-shared"))
1137                 goto put_cpu_node;
1138
1139         for_each_possible_cpu(cpu) {
1140                 if (cpu == cpu_dev->id)
1141                         continue;
1142
1143                 cpu_np = of_cpu_device_node_get(cpu);
1144                 if (!cpu_np) {
1145                         dev_err(cpu_dev, "%s: failed to get cpu%d node\n",
1146                                 __func__, cpu);
1147                         ret = -ENOENT;
1148                         goto put_cpu_node;
1149                 }
1150
1151                 /* Get OPP descriptor node */
1152                 tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0);
1153                 of_node_put(cpu_np);
1154                 if (!tmp_np) {
1155                         pr_err("%pOF: Couldn't find opp node\n", cpu_np);
1156                         ret = -ENOENT;
1157                         goto put_cpu_node;
1158                 }
1159
1160                 /* CPUs are sharing opp node */
1161                 if (np == tmp_np)
1162                         cpumask_set_cpu(cpu, cpumask);
1163
1164                 of_node_put(tmp_np);
1165         }
1166
1167 put_cpu_node:
1168         of_node_put(np);
1169         return ret;
1170 }
1171 EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
1172
1173 /**
1174  * of_get_required_opp_performance_state() - Search for required OPP and return its performance state.
1175  * @np: Node that contains the "required-opps" property.
1176  * @index: Index of the phandle to parse.
1177  *
1178  * Returns the performance state of the OPP pointed out by the "required-opps"
1179  * property at @index in @np.
1180  *
1181  * Return: Zero or positive performance state on success, otherwise negative
1182  * value on errors.
1183  */
1184 int of_get_required_opp_performance_state(struct device_node *np, int index)
1185 {
1186         struct dev_pm_opp *opp;
1187         struct device_node *required_np;
1188         struct opp_table *opp_table;
1189         int pstate = -EINVAL;
1190
1191         required_np = of_parse_required_opp(np, index);
1192         if (!required_np)
1193                 return -EINVAL;
1194
1195         opp_table = _find_table_of_opp_np(required_np);
1196         if (IS_ERR(opp_table)) {
1197                 pr_err("%s: Failed to find required OPP table %pOF: %ld\n",
1198                        __func__, np, PTR_ERR(opp_table));
1199                 goto put_required_np;
1200         }
1201
1202         opp = _find_opp_of_np(opp_table, required_np);
1203         if (opp) {
1204                 pstate = opp->pstate;
1205                 dev_pm_opp_put(opp);
1206         }
1207
1208         dev_pm_opp_put_opp_table(opp_table);
1209
1210 put_required_np:
1211         of_node_put(required_np);
1212
1213         return pstate;
1214 }
1215 EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state);
1216
1217 /**
1218  * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp
1219  * @opp:        opp for which DT node has to be returned for
1220  *
1221  * Return: DT node corresponding to the opp, else 0 on success.
1222  *
1223  * The caller needs to put the node with of_node_put() after using it.
1224  */
1225 struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
1226 {
1227         if (IS_ERR_OR_NULL(opp)) {
1228                 pr_err("%s: Invalid parameters\n", __func__);
1229                 return NULL;
1230         }
1231
1232         return of_node_get(opp->np);
1233 }
1234 EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
1235
1236 /*
1237  * Callback function provided to the Energy Model framework upon registration.
1238  * This computes the power estimated by @dev at @kHz if it is the frequency
1239  * of an existing OPP, or at the frequency of the first OPP above @kHz otherwise
1240  * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled
1241  * frequency and @mW to the associated power. The power is estimated as
1242  * P = C * V^2 * f with C being the device's capacitance and V and f
1243  * respectively the voltage and frequency of the OPP.
1244  *
1245  * Returns -EINVAL if the power calculation failed because of missing
1246  * parameters, 0 otherwise.
1247  */
1248 static int __maybe_unused _get_power(unsigned long *mW, unsigned long *kHz,
1249                                      struct device *dev)
1250 {
1251         struct dev_pm_opp *opp;
1252         struct device_node *np;
1253         unsigned long mV, Hz;
1254         u32 cap;
1255         u64 tmp;
1256         int ret;
1257
1258         np = of_node_get(dev->of_node);
1259         if (!np)
1260                 return -EINVAL;
1261
1262         ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
1263         of_node_put(np);
1264         if (ret)
1265                 return -EINVAL;
1266
1267         Hz = *kHz * 1000;
1268         opp = dev_pm_opp_find_freq_ceil(dev, &Hz);
1269         if (IS_ERR(opp))
1270                 return -EINVAL;
1271
1272         mV = dev_pm_opp_get_voltage(opp) / 1000;
1273         dev_pm_opp_put(opp);
1274         if (!mV)
1275                 return -EINVAL;
1276
1277         tmp = (u64)cap * mV * mV * (Hz / 1000000);
1278         do_div(tmp, 1000000000);
1279
1280         *mW = (unsigned long)tmp;
1281         *kHz = Hz / 1000;
1282
1283         return 0;
1284 }
1285
1286 /**
1287  * dev_pm_opp_of_register_em() - Attempt to register an Energy Model
1288  * @dev         : Device for which an Energy Model has to be registered
1289  * @cpus        : CPUs for which an Energy Model has to be registered. For
1290  *              other type of devices it should be set to NULL.
1291  *
1292  * This checks whether the "dynamic-power-coefficient" devicetree property has
1293  * been specified, and tries to register an Energy Model with it if it has.
1294  * Having this property means the voltages are known for OPPs and the EM
1295  * might be calculated.
1296  */
1297 int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus)
1298 {
1299         struct em_data_callback em_cb = EM_DATA_CB(_get_power);
1300         struct device_node *np;
1301         int ret, nr_opp;
1302         u32 cap;
1303
1304         if (IS_ERR_OR_NULL(dev)) {
1305                 ret = -EINVAL;
1306                 goto failed;
1307         }
1308
1309         nr_opp = dev_pm_opp_get_opp_count(dev);
1310         if (nr_opp <= 0) {
1311                 ret = -EINVAL;
1312                 goto failed;
1313         }
1314
1315         np = of_node_get(dev->of_node);
1316         if (!np) {
1317                 ret = -EINVAL;
1318                 goto failed;
1319         }
1320
1321         /*
1322          * Register an EM only if the 'dynamic-power-coefficient' property is
1323          * set in devicetree. It is assumed the voltage values are known if that
1324          * property is set since it is useless otherwise. If voltages are not
1325          * known, just let the EM registration fail with an error to alert the
1326          * user about the inconsistent configuration.
1327          */
1328         ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
1329         of_node_put(np);
1330         if (ret || !cap) {
1331                 dev_dbg(dev, "Couldn't find proper 'dynamic-power-coefficient' in DT\n");
1332                 ret = -EINVAL;
1333                 goto failed;
1334         }
1335
1336         ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus);
1337         if (ret)
1338                 goto failed;
1339
1340         return 0;
1341
1342 failed:
1343         dev_dbg(dev, "Couldn't register Energy Model %d\n", ret);
1344         return ret;
1345 }
1346 EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em);