drivers/devfreq/event/exynos-ppmu.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * exynos_ppmu.c - Exynos PPMU (Platform Performance Monitoring Unit) support
   4  *
   5  * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd.
   6  * Author : Chanwoo Choi <cw00.choi@samsung.com>
   7  *
   8  * This driver is based on drivers/devfreq/exynos/exynos_ppmu.c
   9  */
  10
  11 #include <linux/clk.h>
  12 #include <linux/io.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/property.h>
  18 #include <linux/regmap.h>
  19 #include <linux/suspend.h>
  20 #include <linux/devfreq-event.h>
  21
  22 #include "exynos-ppmu.h"
  23
  24 enum exynos_ppmu_type {
  25         EXYNOS_TYPE_PPMU,
  26         EXYNOS_TYPE_PPMU_V2,
  27 };
  28
  29 struct exynos_ppmu_data {
  30         struct clk *clk;
  31 };
  32
  33 struct exynos_ppmu {
  34         struct devfreq_event_dev **edev;
  35         struct devfreq_event_desc *desc;
  36         unsigned int num_events;
  37
  38         struct device *dev;
  39         struct regmap *regmap;
  40
  41         struct exynos_ppmu_data ppmu;
  42         enum exynos_ppmu_type ppmu_type;
  43 };
  44
  45 #define PPMU_EVENT(name)                        \
  46         { "ppmu-event0-"#name, PPMU_PMNCNT0 },  \
  47         { "ppmu-event1-"#name, PPMU_PMNCNT1 },  \
  48         { "ppmu-event2-"#name, PPMU_PMNCNT2 },  \
  49         { "ppmu-event3-"#name, PPMU_PMNCNT3 }
  50
  51 static struct __exynos_ppmu_events {
  52         char *name;
  53         int id;
  54 } ppmu_events[] = {
  55         /* For Exynos3250, Exynos4 and Exynos5260 */
  56         PPMU_EVENT(g3d),
  57         PPMU_EVENT(fsys),
  58
  59         /* For Exynos4 SoCs and Exynos3250 */
  60         PPMU_EVENT(dmc0),
  61         PPMU_EVENT(dmc1),
  62         PPMU_EVENT(cpu),
  63         PPMU_EVENT(rightbus),
  64         PPMU_EVENT(leftbus),
  65         PPMU_EVENT(lcd0),
  66         PPMU_EVENT(camif),
  67
  68         /* Only for Exynos3250 and Exynos5260 */
  69         PPMU_EVENT(mfc),
  70
  71         /* Only for Exynos4 SoCs */
  72         PPMU_EVENT(mfc-left),
  73         PPMU_EVENT(mfc-right),
  74
  75         /* Only for Exynos5260 SoCs */
  76         PPMU_EVENT(drex0-s0),
  77         PPMU_EVENT(drex0-s1),
  78         PPMU_EVENT(drex1-s0),
  79         PPMU_EVENT(drex1-s1),
  80         PPMU_EVENT(eagle),
  81         PPMU_EVENT(kfc),
  82         PPMU_EVENT(isp),
  83         PPMU_EVENT(fimc),
  84         PPMU_EVENT(gscl),
  85         PPMU_EVENT(mscl),
  86         PPMU_EVENT(fimd0x),
  87         PPMU_EVENT(fimd1x),
  88
  89         /* Only for Exynos5433 SoCs */
  90         PPMU_EVENT(d0-cpu),
  91         PPMU_EVENT(d0-general),
  92         PPMU_EVENT(d0-rt),
  93         PPMU_EVENT(d1-cpu),
  94         PPMU_EVENT(d1-general),
  95         PPMU_EVENT(d1-rt),
  96
  97         /* For Exynos5422 SoC, deprecated (backwards compatible) */
  98         PPMU_EVENT(dmc0_0),
  99         PPMU_EVENT(dmc0_1),
 100         PPMU_EVENT(dmc1_0),
 101         PPMU_EVENT(dmc1_1),
 102         /* For Exynos5422 SoC */
 103         PPMU_EVENT(dmc0-0),
 104         PPMU_EVENT(dmc0-1),
 105         PPMU_EVENT(dmc1-0),
 106         PPMU_EVENT(dmc1-1),
 107 };
 108
 109 static int __exynos_ppmu_find_ppmu_id(const char *edev_name)
 110 {
 111         int i;
 112
 113         for (i = 0; i < ARRAY_SIZE(ppmu_events); i++)
 114                 if (!strcmp(edev_name, ppmu_events[i].name))
 115                         return ppmu_events[i].id;
 116
 117         return -EINVAL;
 118 }
 119
 120 static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
 121 {
 122         return __exynos_ppmu_find_ppmu_id(edev->desc->name);
 123 }
 124
 125 /*
 126  * The devfreq-event ops structure for PPMU v1.1
 127  */
 128 static int exynos_ppmu_disable(struct devfreq_event_dev *edev)
 129 {
 130         struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
 131         int ret;
 132         u32 pmnc;
 133
 134         /* Disable all counters */
 135         ret = regmap_write(info->regmap, PPMU_CNTENC,
 136                                 PPMU_CCNT_MASK |
 137                                 PPMU_PMCNT0_MASK |
 138                                 PPMU_PMCNT1_MASK |
 139                                 PPMU_PMCNT2_MASK |
 140                                 PPMU_PMCNT3_MASK);
 141         if (ret < 0)
 142                 return ret;
 143
 144         /* Disable PPMU */
 145         ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
 146         if (ret < 0)
 147                 return ret;
 148
 149         pmnc &= ~PPMU_PMNC_ENABLE_MASK;
 150         ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
 151         if (ret < 0)
 152                 return ret;
 153
 154         return 0;
 155 }
 156
 157 static int exynos_ppmu_set_event(struct devfreq_event_dev *edev)
 158 {
 159         struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
 160         int id = exynos_ppmu_find_ppmu_id(edev);
 161         int ret;
 162         u32 pmnc, cntens;
 163
 164         if (id < 0)
 165                 return id;
 166
 167         /* Enable specific counter */
 168         ret = regmap_read(info->regmap, PPMU_CNTENS, &cntens);
 169         if (ret < 0)
 170                 return ret;
 171
 172         cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
 173         ret = regmap_write(info->regmap, PPMU_CNTENS, cntens);
 174         if (ret < 0)
 175                 return ret;
 176
 177         /* Set the event of proper data type monitoring */
 178         ret = regmap_write(info->regmap, PPMU_BEVTxSEL(id),
 179                            edev->desc->event_type);
 180         if (ret < 0)
 181                 return ret;
 182
 183         /* Reset cycle counter/performance counter and enable PPMU */
 184         ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
 185         if (ret < 0)
 186                 return ret;
 187
 188         pmnc &= ~(PPMU_PMNC_ENABLE_MASK
 189                         | PPMU_PMNC_COUNTER_RESET_MASK
 190                         | PPMU_PMNC_CC_RESET_MASK);
 191         pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
 192         pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
 193         pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
 194         ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
 195         if (ret < 0)
 196                 return ret;
 197
 198         return 0;
 199 }
 200
 201 static int exynos_ppmu_get_event(struct devfreq_event_dev *edev,
 202                                 struct devfreq_event_data *edata)
 203 {
 204         struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
 205         int id = exynos_ppmu_find_ppmu_id(edev);
 206         unsigned int total_count, load_count;
 207         unsigned int pmcnt3_high, pmcnt3_low;
 208         unsigned int pmnc, cntenc;
 209         int ret;
 210
 211         if (id < 0)
 212                 return -EINVAL;
 213
 214         /* Disable PPMU */
 215         ret = regmap_read(info->regmap, PPMU_PMNC, &pmnc);
 216         if (ret < 0)
 217                 return ret;
 218
 219         pmnc &= ~PPMU_PMNC_ENABLE_MASK;
 220         ret = regmap_write(info->regmap, PPMU_PMNC, pmnc);
 221         if (ret < 0)
 222                 return ret;
 223
 224         /* Read cycle count */
 225         ret = regmap_read(info->regmap, PPMU_CCNT, &total_count);
 226         if (ret < 0)
 227                 return ret;
 228         edata->total_count = total_count;
 229
 230         /* Read performance count */
 231         switch (id) {
 232         case PPMU_PMNCNT0:
 233         case PPMU_PMNCNT1:
 234         case PPMU_PMNCNT2:
 235                 ret = regmap_read(info->regmap, PPMU_PMNCT(id), &load_count);
 236                 if (ret < 0)
 237                         return ret;
 238                 edata->load_count = load_count;
 239                 break;
 240         case PPMU_PMNCNT3:
 241                 ret = regmap_read(info->regmap, PPMU_PMCNT3_HIGH, &pmcnt3_high);
 242                 if (ret < 0)
 243                         return ret;
 244
 245                 ret = regmap_read(info->regmap, PPMU_PMCNT3_LOW, &pmcnt3_low);
 246                 if (ret < 0)
 247                         return ret;
 248
 249                 edata->load_count = ((pmcnt3_high << 8) | pmcnt3_low);
 250                 break;
 251         default:
 252                 return -EINVAL;
 253         }
 254
 255         /* Disable specific counter */
 256         ret = regmap_read(info->regmap, PPMU_CNTENC, &cntenc);
 257         if (ret < 0)
 258                 return ret;
 259
 260         cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
 261         ret = regmap_write(info->regmap, PPMU_CNTENC, cntenc);
 262         if (ret < 0)
 263                 return ret;
 264
 265         dev_dbg(&edev->dev, "%s (event: %ld/%ld)\n", edev->desc->name,
 266                                         edata->load_count, edata->total_count);
 267
 268         return 0;
 269 }
 270
 271 static const struct devfreq_event_ops exynos_ppmu_ops = {
 272         .disable = exynos_ppmu_disable,
 273         .set_event = exynos_ppmu_set_event,
 274         .get_event = exynos_ppmu_get_event,
 275 };
 276
 277 /*
 278  * The devfreq-event ops structure for PPMU v2.0
 279  */
 280 static int exynos_ppmu_v2_disable(struct devfreq_event_dev *edev)
 281 {
 282         struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
 283         int ret;
 284         u32 pmnc, clear;
 285
 286         /* Disable all counters */
 287         clear = (PPMU_CCNT_MASK | PPMU_PMCNT0_MASK | PPMU_PMCNT1_MASK
 288                 | PPMU_PMCNT2_MASK | PPMU_PMCNT3_MASK);
 289         ret = regmap_write(info->regmap, PPMU_V2_FLAG, clear);
 290         if (ret < 0)
 291                 return ret;
 292
 293         ret = regmap_write(info->regmap, PPMU_V2_INTENC, clear);
 294         if (ret < 0)
 295                 return ret;
 296
 297         ret = regmap_write(info->regmap, PPMU_V2_CNTENC, clear);
 298         if (ret < 0)
 299                 return ret;
 300
 301         ret = regmap_write(info->regmap, PPMU_V2_CNT_RESET, clear);
 302         if (ret < 0)
 303                 return ret;
 304
 305         ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG0, 0x0);
 306         if (ret < 0)
 307                 return ret;
 308
 309         ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG1, 0x0);
 310         if (ret < 0)
 311                 return ret;
 312
 313         ret = regmap_write(info->regmap, PPMU_V2_CIG_CFG2, 0x0);
 314         if (ret < 0)
 315                 return ret;
 316
 317         ret = regmap_write(info->regmap, PPMU_V2_CIG_RESULT, 0x0);
 318         if (ret < 0)
 319                 return ret;
 320
 321         ret = regmap_write(info->regmap, PPMU_V2_CNT_AUTO, 0x0);
 322         if (ret < 0)
 323                 return ret;
 324
 325         ret = regmap_write(info->regmap, PPMU_V2_CH_EV0_TYPE, 0x0);
 326         if (ret < 0)
 327                 return ret;
 328
 329         ret = regmap_write(info->regmap, PPMU_V2_CH_EV1_TYPE, 0x0);
 330         if (ret < 0)
 331                 return ret;
 332
 333         ret = regmap_write(info->regmap, PPMU_V2_CH_EV2_TYPE, 0x0);
 334         if (ret < 0)
 335                 return ret;
 336
 337         ret = regmap_write(info->regmap, PPMU_V2_CH_EV3_TYPE, 0x0);
 338         if (ret < 0)
 339                 return ret;
 340
 341         ret = regmap_write(info->regmap, PPMU_V2_SM_ID_V, 0x0);
 342         if (ret < 0)
 343                 return ret;
 344
 345         ret = regmap_write(info->regmap, PPMU_V2_SM_ID_A, 0x0);
 346         if (ret < 0)
 347                 return ret;
 348
 349         ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_V, 0x0);
 350         if (ret < 0)
 351                 return ret;
 352
 353         ret = regmap_write(info->regmap, PPMU_V2_SM_OTHERS_A, 0x0);
 354         if (ret < 0)
 355                 return ret;
 356
 357         ret = regmap_write(info->regmap, PPMU_V2_INTERRUPT_RESET, 0x0);
 358         if (ret < 0)
 359                 return ret;
 360
 361         /* Disable PPMU */
 362         ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
 363         if (ret < 0)
 364                 return ret;
 365
 366         pmnc &= ~PPMU_PMNC_ENABLE_MASK;
 367         ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
 368         if (ret < 0)
 369                 return ret;
 370
 371         return 0;
 372 }
 373
 374 static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
 375 {
 376         struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
 377         unsigned int pmnc, cntens;
 378         int id = exynos_ppmu_find_ppmu_id(edev);
 379         int ret;
 380
 381         /* Enable all counters */
 382         ret = regmap_read(info->regmap, PPMU_V2_CNTENS, &cntens);
 383         if (ret < 0)
 384                 return ret;
 385
 386         cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
 387         ret = regmap_write(info->regmap, PPMU_V2_CNTENS, cntens);
 388         if (ret < 0)
 389                 return ret;
 390
 391         /* Set the event of proper data type monitoring */
 392         ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
 393                            edev->desc->event_type);
 394         if (ret < 0)
 395                 return ret;
 396
 397         /* Reset cycle counter/performance counter and enable PPMU */
 398         ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
 399         if (ret < 0)
 400                 return ret;
 401
 402         pmnc &= ~(PPMU_PMNC_ENABLE_MASK
 403                         | PPMU_PMNC_COUNTER_RESET_MASK
 404                         | PPMU_PMNC_CC_RESET_MASK
 405                         | PPMU_PMNC_CC_DIVIDER_MASK
 406                         | PPMU_V2_PMNC_START_MODE_MASK);
 407         pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
 408         pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
 409         pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
 410         pmnc |= (PPMU_V2_MODE_MANUAL << PPMU_V2_PMNC_START_MODE_SHIFT);
 411
 412         ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
 413         if (ret < 0)
 414                 return ret;
 415
 416         return 0;
 417 }
 418
 419 static int exynos_ppmu_v2_get_event(struct devfreq_event_dev *edev,
 420                                     struct devfreq_event_data *edata)
 421 {
 422         struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
 423         int id = exynos_ppmu_find_ppmu_id(edev);
 424         int ret;
 425         unsigned int pmnc, cntenc;
 426         unsigned int pmcnt_high, pmcnt_low;
 427         unsigned int total_count, count;
 428         unsigned long load_count = 0;
 429
 430         /* Disable PPMU */
 431         ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
 432         if (ret < 0)
 433                 return ret;
 434
 435         pmnc &= ~PPMU_PMNC_ENABLE_MASK;
 436         ret = regmap_write(info->regmap, PPMU_V2_PMNC, pmnc);
 437         if (ret < 0)
 438                 return ret;
 439
 440         /* Read cycle count and performance count */
 441         ret = regmap_read(info->regmap, PPMU_V2_CCNT, &total_count);
 442         if (ret < 0)
 443                 return ret;
 444         edata->total_count = total_count;
 445
 446         switch (id) {
 447         case PPMU_PMNCNT0:
 448         case PPMU_PMNCNT1:
 449         case PPMU_PMNCNT2:
 450                 ret = regmap_read(info->regmap, PPMU_V2_PMNCT(id), &count);
 451                 if (ret < 0)
 452                         return ret;
 453                 load_count = count;
 454                 break;
 455         case PPMU_PMNCNT3:
 456                 ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_HIGH,
 457                                                 &pmcnt_high);
 458                 if (ret < 0)
 459                         return ret;
 460
 461                 ret = regmap_read(info->regmap, PPMU_V2_PMCNT3_LOW, &pmcnt_low);
 462                 if (ret < 0)
 463                         return ret;
 464
 465                 load_count = ((u64)((pmcnt_high & 0xff)) << 32)+ (u64)pmcnt_low;
 466                 break;
 467         }
 468         edata->load_count = load_count;
 469
 470         /* Disable all counters */
 471         ret = regmap_read(info->regmap, PPMU_V2_CNTENC, &cntenc);
 472         if (ret < 0)
 473                 return 0;
 474
 475         cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
 476         ret = regmap_write(info->regmap, PPMU_V2_CNTENC, cntenc);
 477         if (ret < 0)
 478                 return ret;
 479
 480         dev_dbg(&edev->dev, "%25s (load: %ld / %ld)\n", edev->desc->name,
 481                                         edata->load_count, edata->total_count);
 482         return 0;
 483 }
 484
 485 static const struct devfreq_event_ops exynos_ppmu_v2_ops = {
 486         .disable = exynos_ppmu_v2_disable,
 487         .set_event = exynos_ppmu_v2_set_event,
 488         .get_event = exynos_ppmu_v2_get_event,
 489 };
 490
 491 static const struct of_device_id exynos_ppmu_id_match[] = {
 492         {
 493                 .compatible = "samsung,exynos-ppmu",
 494                 .data = (void *)EXYNOS_TYPE_PPMU,
 495         }, {
 496                 .compatible = "samsung,exynos-ppmu-v2",
 497                 .data = (void *)EXYNOS_TYPE_PPMU_V2,
 498         },
 499         { /* sentinel */ },
 500 };
 501 MODULE_DEVICE_TABLE(of, exynos_ppmu_id_match);
 502
 503 static int of_get_devfreq_events(struct device_node *np,
 504                                  struct exynos_ppmu *info)
 505 {
 506         struct devfreq_event_desc *desc;
 507         struct device *dev = info->dev;
 508         struct device_node *events_np, *node;
 509         int i, j, count;
 510         int ret;
 511
 512         events_np = of_get_child_by_name(np, "events");
 513         if (!events_np) {
 514                 dev_err(dev,
 515                         "failed to get child node of devfreq-event devices\n");
 516                 return -EINVAL;
 517         }
 518
 519         count = of_get_child_count(events_np);
 520         desc = devm_kcalloc(dev, count, sizeof(*desc), GFP_KERNEL);
 521         if (!desc) {
 522                 of_node_put(events_np);
 523                 return -ENOMEM;
 524         }
 525         info->num_events = count;
 526
 527         info->ppmu_type = (enum exynos_ppmu_type)device_get_match_data(dev);
 528
 529         j = 0;
 530         for_each_child_of_node(events_np, node) {
 531                 for (i = 0; i < ARRAY_SIZE(ppmu_events); i++) {
 532                         if (!ppmu_events[i].name)
 533                                 continue;
 534
 535                         if (of_node_name_eq(node, ppmu_events[i].name))
 536                                 break;
 537                 }
 538
 539                 if (i == ARRAY_SIZE(ppmu_events)) {
 540                         dev_warn(dev,
 541                                 "don't know how to configure events : %pOFn\n",
 542                                 node);
 543                         continue;
 544                 }
 545
 546                 switch (info->ppmu_type) {
 547                 case EXYNOS_TYPE_PPMU:
 548                         desc[j].ops = &exynos_ppmu_ops;
 549                         break;
 550                 case EXYNOS_TYPE_PPMU_V2:
 551                         desc[j].ops = &exynos_ppmu_v2_ops;
 552                         break;
 553                 }
 554
 555                 desc[j].driver_data = info;
 556
 557                 of_property_read_string(node, "event-name", &desc[j].name);
 558                 ret = of_property_read_u32(node, "event-data-type",
 559                                            &desc[j].event_type);
 560                 if (ret) {
 561                         /* Set the event of proper data type counting.
 562                          * Check if the data type has been defined in DT,
 563                          * use default if not.
 564                          */
 565                         if (info->ppmu_type == EXYNOS_TYPE_PPMU_V2) {
 566                                 /* Not all registers take the same value for
 567                                  * read+write data count.
 568                                  */
 569                                 switch (ppmu_events[i].id) {
 570                                 case PPMU_PMNCNT0:
 571                                 case PPMU_PMNCNT1:
 572                                 case PPMU_PMNCNT2:
 573                                         desc[j].event_type = PPMU_V2_RO_DATA_CNT
 574                                                 | PPMU_V2_WO_DATA_CNT;
 575                                         break;
 576                                 case PPMU_PMNCNT3:
 577                                         desc[j].event_type =
 578                                                 PPMU_V2_EVT3_RW_DATA_CNT;
 579                                         break;
 580                                 }
 581                         } else {
 582                                 desc[j].event_type = PPMU_RO_DATA_CNT |
 583                                         PPMU_WO_DATA_CNT;
 584                         }
 585                 }
 586
 587                 j++;
 588         }
 589         info->desc = desc;
 590
 591         of_node_put(events_np);
 592
 593         return 0;
 594 }
 595
 596 static struct regmap_config exynos_ppmu_regmap_config = {
 597         .reg_bits = 32,
 598         .val_bits = 32,
 599         .reg_stride = 4,
 600 };
 601
 602 static int exynos_ppmu_parse_dt(struct platform_device *pdev,
 603                                 struct exynos_ppmu *info)
 604 {
 605         struct device *dev = info->dev;
 606         struct device_node *np = dev->of_node;
 607         struct resource *res;
 608         void __iomem *base;
 609         int ret = 0;
 610
 611         if (!np) {
 612                 dev_err(dev, "failed to find devicetree node\n");
 613                 return -EINVAL;
 614         }
 615
 616         /* Maps the memory mapped IO to control PPMU register */
 617         base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 618         if (IS_ERR(base))
 619                 return PTR_ERR(base);
 620
 621         exynos_ppmu_regmap_config.max_register = resource_size(res) - 4;
 622         info->regmap = devm_regmap_init_mmio(dev, base,
 623                                         &exynos_ppmu_regmap_config);
 624         if (IS_ERR(info->regmap)) {
 625                 dev_err(dev, "failed to initialize regmap\n");
 626                 return PTR_ERR(info->regmap);
 627         }
 628
 629         info->ppmu.clk = devm_clk_get(dev, "ppmu");
 630         if (IS_ERR(info->ppmu.clk)) {
 631                 info->ppmu.clk = NULL;
 632                 dev_warn(dev, "cannot get PPMU clock\n");
 633         }
 634
 635         ret = of_get_devfreq_events(np, info);
 636         if (ret < 0) {
 637                 dev_err(dev, "failed to parse exynos ppmu dt node\n");
 638                 return ret;
 639         }
 640
 641         return 0;
 642 }
 643
 644 static int exynos_ppmu_probe(struct platform_device *pdev)
 645 {
 646         struct exynos_ppmu *info;
 647         struct devfreq_event_dev **edev;
 648         struct devfreq_event_desc *desc;
 649         int i, ret = 0, size;
 650
 651         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 652         if (!info)
 653                 return -ENOMEM;
 654
 655         info->dev = &pdev->dev;
 656
 657         /* Parse dt data to get resource */
 658         ret = exynos_ppmu_parse_dt(pdev, info);
 659         if (ret < 0) {
 660                 dev_err(&pdev->dev,
 661                         "failed to parse devicetree for resource\n");
 662                 return ret;
 663         }
 664         desc = info->desc;
 665
 666         size = sizeof(struct devfreq_event_dev *) * info->num_events;
 667         info->edev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 668         if (!info->edev)
 669                 return -ENOMEM;
 670
 671         edev = info->edev;
 672         platform_set_drvdata(pdev, info);
 673
 674         for (i = 0; i < info->num_events; i++) {
 675                 edev[i] = devm_devfreq_event_add_edev(&pdev->dev, &desc[i]);
 676                 if (IS_ERR(edev[i])) {
 677                         dev_err(&pdev->dev,
 678                                 "failed to add devfreq-event device\n");
 679                         return PTR_ERR(edev[i]);
 680                 }
 681
 682                 pr_info("exynos-ppmu: new PPMU device registered %s (%s)\n",
 683                         dev_name(&pdev->dev), desc[i].name);
 684         }
 685
 686         ret = clk_prepare_enable(info->ppmu.clk);
 687         if (ret) {
 688                 dev_err(&pdev->dev, "failed to prepare ppmu clock\n");
 689                 return ret;
 690         }
 691
 692         return 0;
 693 }
 694
 695 static void exynos_ppmu_remove(struct platform_device *pdev)
 696 {
 697         struct exynos_ppmu *info = platform_get_drvdata(pdev);
 698
 699         clk_disable_unprepare(info->ppmu.clk);
 700 }
 701
 702 static struct platform_driver exynos_ppmu_driver = {
 703         .probe  = exynos_ppmu_probe,
 704         .remove = exynos_ppmu_remove,
 705         .driver = {
 706                 .name   = "exynos-ppmu",
 707                 .of_match_table = exynos_ppmu_id_match,
 708         },
 709 };
 710 module_platform_driver(exynos_ppmu_driver);
 711
 712 MODULE_DESCRIPTION("Exynos PPMU(Platform Performance Monitoring Unit) driver");
 713 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
 714 MODULE_LICENSE("GPL");