drivers/firmware/arm_scmi/perf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * System Control and Management Interface (SCMI) Performance Protocol
   4  *
   5  * Copyright (C) 2018 ARM Ltd.
   6  */
   7
   8 #include <linux/bits.h>
   9 #include <linux/of.h>
  10 #include <linux/io.h>
  11 #include <linux/io-64-nonatomic-hi-lo.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/pm_opp.h>
  14 #include <linux/sort.h>
  15
  16 #include "common.h"
  17
  18 enum scmi_performance_protocol_cmd {
  19         PERF_DOMAIN_ATTRIBUTES = 0x3,
  20         PERF_DESCRIBE_LEVELS = 0x4,
  21         PERF_LIMITS_SET = 0x5,
  22         PERF_LIMITS_GET = 0x6,
  23         PERF_LEVEL_SET = 0x7,
  24         PERF_LEVEL_GET = 0x8,
  25         PERF_NOTIFY_LIMITS = 0x9,
  26         PERF_NOTIFY_LEVEL = 0xa,
  27         PERF_DESCRIBE_FASTCHANNEL = 0xb,
  28 };
  29
  30 struct scmi_opp {
  31         u32 perf;
  32         u32 power;
  33         u32 trans_latency_us;
  34 };
  35
  36 struct scmi_msg_resp_perf_attributes {
  37         __le16 num_domains;
  38         __le16 flags;
  39 #define POWER_SCALE_IN_MILLIWATT(x)     ((x) & BIT(0))
  40         __le32 stats_addr_low;
  41         __le32 stats_addr_high;
  42         __le32 stats_size;
  43 };
  44
  45 struct scmi_msg_resp_perf_domain_attributes {
  46         __le32 flags;
  47 #define SUPPORTS_SET_LIMITS(x)          ((x) & BIT(31))
  48 #define SUPPORTS_SET_PERF_LVL(x)        ((x) & BIT(30))
  49 #define SUPPORTS_PERF_LIMIT_NOTIFY(x)   ((x) & BIT(29))
  50 #define SUPPORTS_PERF_LEVEL_NOTIFY(x)   ((x) & BIT(28))
  51 #define SUPPORTS_PERF_FASTCHANNELS(x)   ((x) & BIT(27))
  52         __le32 rate_limit_us;
  53         __le32 sustained_freq_khz;
  54         __le32 sustained_perf_level;
  55             u8 name[SCMI_MAX_STR_SIZE];
  56 };
  57
  58 struct scmi_msg_perf_describe_levels {
  59         __le32 domain;
  60         __le32 level_index;
  61 };
  62
  63 struct scmi_perf_set_limits {
  64         __le32 domain;
  65         __le32 max_level;
  66         __le32 min_level;
  67 };
  68
  69 struct scmi_perf_get_limits {
  70         __le32 max_level;
  71         __le32 min_level;
  72 };
  73
  74 struct scmi_perf_set_level {
  75         __le32 domain;
  76         __le32 level;
  77 };
  78
  79 struct scmi_perf_notify_level_or_limits {
  80         __le32 domain;
  81         __le32 notify_enable;
  82 };
  83
  84 struct scmi_msg_resp_perf_describe_levels {
  85         __le16 num_returned;
  86         __le16 num_remaining;
  87         struct {
  88                 __le32 perf_val;
  89                 __le32 power;
  90                 __le16 transition_latency_us;
  91                 __le16 reserved;
  92         } opp[0];
  93 };
  94
  95 struct scmi_perf_get_fc_info {
  96         __le32 domain;
  97         __le32 message_id;
  98 };
  99
 100 struct scmi_msg_resp_perf_desc_fc {
 101         __le32 attr;
 102 #define SUPPORTS_DOORBELL(x)            ((x) & BIT(0))
 103 #define DOORBELL_REG_WIDTH(x)           FIELD_GET(GENMASK(2, 1), (x))
 104         __le32 rate_limit;
 105         __le32 chan_addr_low;
 106         __le32 chan_addr_high;
 107         __le32 chan_size;
 108         __le32 db_addr_low;
 109         __le32 db_addr_high;
 110         __le32 db_set_lmask;
 111         __le32 db_set_hmask;
 112         __le32 db_preserve_lmask;
 113         __le32 db_preserve_hmask;
 114 };
 115
 116 struct scmi_fc_db_info {
 117         int width;
 118         u64 set;
 119         u64 mask;
 120         void __iomem *addr;
 121 };
 122
 123 struct scmi_fc_info {
 124         void __iomem *level_set_addr;
 125         void __iomem *limit_set_addr;
 126         void __iomem *level_get_addr;
 127         void __iomem *limit_get_addr;
 128         struct scmi_fc_db_info *level_set_db;
 129         struct scmi_fc_db_info *limit_set_db;
 130 };
 131
 132 struct perf_dom_info {
 133         bool set_limits;
 134         bool set_perf;
 135         bool perf_limit_notify;
 136         bool perf_level_notify;
 137         bool perf_fastchannels;
 138         u32 opp_count;
 139         u32 sustained_freq_khz;
 140         u32 sustained_perf_level;
 141         u32 mult_factor;
 142         char name[SCMI_MAX_STR_SIZE];
 143         struct scmi_opp opp[MAX_OPPS];
 144         struct scmi_fc_info *fc_info;
 145 };
 146
 147 struct scmi_perf_info {
 148         u32 version;
 149         int num_domains;
 150         bool power_scale_mw;
 151         u64 stats_addr;
 152         u32 stats_size;
 153         struct perf_dom_info *dom_info;
 154 };
 155
 156 static int scmi_perf_attributes_get(const struct scmi_handle *handle,
 157                                     struct scmi_perf_info *pi)
 158 {
 159         int ret;
 160         struct scmi_xfer *t;
 161         struct scmi_msg_resp_perf_attributes *attr;
 162
 163         ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
 164                                  SCMI_PROTOCOL_PERF, 0, sizeof(*attr), &t);
 165         if (ret)
 166                 return ret;
 167
 168         attr = t->rx.buf;
 169
 170         ret = scmi_do_xfer(handle, t);
 171         if (!ret) {
 172                 u16 flags = le16_to_cpu(attr->flags);
 173
 174                 pi->num_domains = le16_to_cpu(attr->num_domains);
 175                 pi->power_scale_mw = POWER_SCALE_IN_MILLIWATT(flags);
 176                 pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
 177                                 (u64)le32_to_cpu(attr->stats_addr_high) << 32;
 178                 pi->stats_size = le32_to_cpu(attr->stats_size);
 179         }
 180
 181         scmi_xfer_put(handle, t);
 182         return ret;
 183 }
 184
 185 static int
 186 scmi_perf_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
 187                                 struct perf_dom_info *dom_info)
 188 {
 189         int ret;
 190         struct scmi_xfer *t;
 191         struct scmi_msg_resp_perf_domain_attributes *attr;
 192
 193         ret = scmi_xfer_get_init(handle, PERF_DOMAIN_ATTRIBUTES,
 194                                  SCMI_PROTOCOL_PERF, sizeof(domain),
 195                                  sizeof(*attr), &t);
 196         if (ret)
 197                 return ret;
 198
 199         put_unaligned_le32(domain, t->tx.buf);
 200         attr = t->rx.buf;
 201
 202         ret = scmi_do_xfer(handle, t);
 203         if (!ret) {
 204                 u32 flags = le32_to_cpu(attr->flags);
 205
 206                 dom_info->set_limits = SUPPORTS_SET_LIMITS(flags);
 207                 dom_info->set_perf = SUPPORTS_SET_PERF_LVL(flags);
 208                 dom_info->perf_limit_notify = SUPPORTS_PERF_LIMIT_NOTIFY(flags);
 209                 dom_info->perf_level_notify = SUPPORTS_PERF_LEVEL_NOTIFY(flags);
 210                 dom_info->perf_fastchannels = SUPPORTS_PERF_FASTCHANNELS(flags);
 211                 dom_info->sustained_freq_khz =
 212                                         le32_to_cpu(attr->sustained_freq_khz);
 213                 dom_info->sustained_perf_level =
 214                                         le32_to_cpu(attr->sustained_perf_level);
 215                 if (!dom_info->sustained_freq_khz ||
 216                     !dom_info->sustained_perf_level)
 217                         /* CPUFreq converts to kHz, hence default 1000 */
 218                         dom_info->mult_factor = 1000;
 219                 else
 220                         dom_info->mult_factor =
 221                                         (dom_info->sustained_freq_khz * 1000) /
 222                                         dom_info->sustained_perf_level;
 223                 strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
 224         }
 225
 226         scmi_xfer_put(handle, t);
 227         return ret;
 228 }
 229
 230 static int opp_cmp_func(const void *opp1, const void *opp2)
 231 {
 232         const struct scmi_opp *t1 = opp1, *t2 = opp2;
 233
 234         return t1->perf - t2->perf;
 235 }
 236
 237 static int
 238 scmi_perf_describe_levels_get(const struct scmi_handle *handle, u32 domain,
 239                               struct perf_dom_info *perf_dom)
 240 {
 241         int ret, cnt;
 242         u32 tot_opp_cnt = 0;
 243         u16 num_returned, num_remaining;
 244         struct scmi_xfer *t;
 245         struct scmi_opp *opp;
 246         struct scmi_msg_perf_describe_levels *dom_info;
 247         struct scmi_msg_resp_perf_describe_levels *level_info;
 248
 249         ret = scmi_xfer_get_init(handle, PERF_DESCRIBE_LEVELS,
 250                                  SCMI_PROTOCOL_PERF, sizeof(*dom_info), 0, &t);
 251         if (ret)
 252                 return ret;
 253
 254         dom_info = t->tx.buf;
 255         level_info = t->rx.buf;
 256
 257         do {
 258                 dom_info->domain = cpu_to_le32(domain);
 259                 /* Set the number of OPPs to be skipped/already read */
 260                 dom_info->level_index = cpu_to_le32(tot_opp_cnt);
 261
 262                 ret = scmi_do_xfer(handle, t);
 263                 if (ret)
 264                         break;
 265
 266                 num_returned = le16_to_cpu(level_info->num_returned);
 267                 num_remaining = le16_to_cpu(level_info->num_remaining);
 268                 if (tot_opp_cnt + num_returned > MAX_OPPS) {
 269                         dev_err(handle->dev, "No. of OPPs exceeded MAX_OPPS");
 270                         break;
 271                 }
 272
 273                 opp = &perf_dom->opp[tot_opp_cnt];
 274                 for (cnt = 0; cnt < num_returned; cnt++, opp++) {
 275                         opp->perf = le32_to_cpu(level_info->opp[cnt].perf_val);
 276                         opp->power = le32_to_cpu(level_info->opp[cnt].power);
 277                         opp->trans_latency_us = le16_to_cpu
 278                                 (level_info->opp[cnt].transition_latency_us);
 279
 280                         dev_dbg(handle->dev, "Level %d Power %d Latency %dus\n",
 281                                 opp->perf, opp->power, opp->trans_latency_us);
 282                 }
 283
 284                 tot_opp_cnt += num_returned;
 285                 /*
 286                  * check for both returned and remaining to avoid infinite
 287                  * loop due to buggy firmware
 288                  */
 289         } while (num_returned && num_remaining);
 290
 291         perf_dom->opp_count = tot_opp_cnt;
 292         scmi_xfer_put(handle, t);
 293
 294         sort(perf_dom->opp, tot_opp_cnt, sizeof(*opp), opp_cmp_func, NULL);
 295         return ret;
 296 }
 297
 298 #define SCMI_PERF_FC_RING_DB(w)                         \
 299 do {                                                    \
 300         u##w val = 0;                                   \
 301                                                         \
 302         if (db->mask)                                   \
 303                 val = ioread##w(db->addr) & db->mask;   \
 304         iowrite##w((u##w)db->set | val, db->addr);      \
 305 } while (0)
 306
 307 static void scmi_perf_fc_ring_db(struct scmi_fc_db_info *db)
 308 {
 309         if (!db || !db->addr)
 310                 return;
 311
 312         if (db->width == 1)
 313                 SCMI_PERF_FC_RING_DB(8);
 314         else if (db->width == 2)
 315                 SCMI_PERF_FC_RING_DB(16);
 316         else if (db->width == 4)
 317                 SCMI_PERF_FC_RING_DB(32);
 318         else /* db->width == 8 */
 319 #ifdef CONFIG_64BIT
 320                 SCMI_PERF_FC_RING_DB(64);
 321 #else
 322         {
 323                 u64 val = 0;
 324
 325                 if (db->mask)
 326                         val = ioread64_hi_lo(db->addr) & db->mask;
 327                 iowrite64_hi_lo(db->set | val, db->addr);
 328         }
 329 #endif
 330 }
 331
 332 static int scmi_perf_mb_limits_set(const struct scmi_handle *handle, u32 domain,
 333                                    u32 max_perf, u32 min_perf)
 334 {
 335         int ret;
 336         struct scmi_xfer *t;
 337         struct scmi_perf_set_limits *limits;
 338
 339         ret = scmi_xfer_get_init(handle, PERF_LIMITS_SET, SCMI_PROTOCOL_PERF,
 340                                  sizeof(*limits), 0, &t);
 341         if (ret)
 342                 return ret;
 343
 344         limits = t->tx.buf;
 345         limits->domain = cpu_to_le32(domain);
 346         limits->max_level = cpu_to_le32(max_perf);
 347         limits->min_level = cpu_to_le32(min_perf);
 348
 349         ret = scmi_do_xfer(handle, t);
 350
 351         scmi_xfer_put(handle, t);
 352         return ret;
 353 }
 354
 355 static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
 356                                 u32 max_perf, u32 min_perf)
 357 {
 358         struct scmi_perf_info *pi = handle->perf_priv;
 359         struct perf_dom_info *dom = pi->dom_info + domain;
 360
 361         if (dom->fc_info && dom->fc_info->limit_set_addr) {
 362                 iowrite32(max_perf, dom->fc_info->limit_set_addr);
 363                 iowrite32(min_perf, dom->fc_info->limit_set_addr + 4);
 364                 scmi_perf_fc_ring_db(dom->fc_info->limit_set_db);
 365                 return 0;
 366         }
 367
 368         return scmi_perf_mb_limits_set(handle, domain, max_perf, min_perf);
 369 }
 370
 371 static int scmi_perf_mb_limits_get(const struct scmi_handle *handle, u32 domain,
 372                                    u32 *max_perf, u32 *min_perf)
 373 {
 374         int ret;
 375         struct scmi_xfer *t;
 376         struct scmi_perf_get_limits *limits;
 377
 378         ret = scmi_xfer_get_init(handle, PERF_LIMITS_GET, SCMI_PROTOCOL_PERF,
 379                                  sizeof(__le32), 0, &t);
 380         if (ret)
 381                 return ret;
 382
 383         put_unaligned_le32(domain, t->tx.buf);
 384
 385         ret = scmi_do_xfer(handle, t);
 386         if (!ret) {
 387                 limits = t->rx.buf;
 388
 389                 *max_perf = le32_to_cpu(limits->max_level);
 390                 *min_perf = le32_to_cpu(limits->min_level);
 391         }
 392
 393         scmi_xfer_put(handle, t);
 394         return ret;
 395 }
 396
 397 static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
 398                                 u32 *max_perf, u32 *min_perf)
 399 {
 400         struct scmi_perf_info *pi = handle->perf_priv;
 401         struct perf_dom_info *dom = pi->dom_info + domain;
 402
 403         if (dom->fc_info && dom->fc_info->limit_get_addr) {
 404                 *max_perf = ioread32(dom->fc_info->limit_get_addr);
 405                 *min_perf = ioread32(dom->fc_info->limit_get_addr + 4);
 406                 return 0;
 407         }
 408
 409         return scmi_perf_mb_limits_get(handle, domain, max_perf, min_perf);
 410 }
 411
 412 static int scmi_perf_mb_level_set(const struct scmi_handle *handle, u32 domain,
 413                                   u32 level, bool poll)
 414 {
 415         int ret;
 416         struct scmi_xfer *t;
 417         struct scmi_perf_set_level *lvl;
 418
 419         ret = scmi_xfer_get_init(handle, PERF_LEVEL_SET, SCMI_PROTOCOL_PERF,
 420                                  sizeof(*lvl), 0, &t);
 421         if (ret)
 422                 return ret;
 423
 424         t->hdr.poll_completion = poll;
 425         lvl = t->tx.buf;
 426         lvl->domain = cpu_to_le32(domain);
 427         lvl->level = cpu_to_le32(level);
 428
 429         ret = scmi_do_xfer(handle, t);
 430
 431         scmi_xfer_put(handle, t);
 432         return ret;
 433 }
 434
 435 static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
 436                                u32 level, bool poll)
 437 {
 438         struct scmi_perf_info *pi = handle->perf_priv;
 439         struct perf_dom_info *dom = pi->dom_info + domain;
 440
 441         if (dom->fc_info && dom->fc_info->level_set_addr) {
 442                 iowrite32(level, dom->fc_info->level_set_addr);
 443                 scmi_perf_fc_ring_db(dom->fc_info->level_set_db);
 444                 return 0;
 445         }
 446
 447         return scmi_perf_mb_level_set(handle, domain, level, poll);
 448 }
 449
 450 static int scmi_perf_mb_level_get(const struct scmi_handle *handle, u32 domain,
 451                                   u32 *level, bool poll)
 452 {
 453         int ret;
 454         struct scmi_xfer *t;
 455
 456         ret = scmi_xfer_get_init(handle, PERF_LEVEL_GET, SCMI_PROTOCOL_PERF,
 457                                  sizeof(u32), sizeof(u32), &t);
 458         if (ret)
 459                 return ret;
 460
 461         t->hdr.poll_completion = poll;
 462         put_unaligned_le32(domain, t->tx.buf);
 463
 464         ret = scmi_do_xfer(handle, t);
 465         if (!ret)
 466                 *level = get_unaligned_le32(t->rx.buf);
 467
 468         scmi_xfer_put(handle, t);
 469         return ret;
 470 }
 471
 472 static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
 473                                u32 *level, bool poll)
 474 {
 475         struct scmi_perf_info *pi = handle->perf_priv;
 476         struct perf_dom_info *dom = pi->dom_info + domain;
 477
 478         if (dom->fc_info && dom->fc_info->level_get_addr) {
 479                 *level = ioread32(dom->fc_info->level_get_addr);
 480                 return 0;
 481         }
 482
 483         return scmi_perf_mb_level_get(handle, domain, level, poll);
 484 }
 485
 486 static bool scmi_perf_fc_size_is_valid(u32 msg, u32 size)
 487 {
 488         if ((msg == PERF_LEVEL_GET || msg == PERF_LEVEL_SET) && size == 4)
 489                 return true;
 490         if ((msg == PERF_LIMITS_GET || msg == PERF_LIMITS_SET) && size == 8)
 491                 return true;
 492         return false;
 493 }
 494
 495 static void
 496 scmi_perf_domain_desc_fc(const struct scmi_handle *handle, u32 domain,
 497                          u32 message_id, void __iomem **p_addr,
 498                          struct scmi_fc_db_info **p_db)
 499 {
 500         int ret;
 501         u32 flags;
 502         u64 phys_addr;
 503         u8 size;
 504         void __iomem *addr;
 505         struct scmi_xfer *t;
 506         struct scmi_fc_db_info *db;
 507         struct scmi_perf_get_fc_info *info;
 508         struct scmi_msg_resp_perf_desc_fc *resp;
 509
 510         if (!p_addr)
 511                 return;
 512
 513         ret = scmi_xfer_get_init(handle, PERF_DESCRIBE_FASTCHANNEL,
 514                                  SCMI_PROTOCOL_PERF,
 515                                  sizeof(*info), sizeof(*resp), &t);
 516         if (ret)
 517                 return;
 518
 519         info = t->tx.buf;
 520         info->domain = cpu_to_le32(domain);
 521         info->message_id = cpu_to_le32(message_id);
 522
 523         ret = scmi_do_xfer(handle, t);
 524         if (ret)
 525                 goto err_xfer;
 526
 527         resp = t->rx.buf;
 528         flags = le32_to_cpu(resp->attr);
 529         size = le32_to_cpu(resp->chan_size);
 530         if (!scmi_perf_fc_size_is_valid(message_id, size))
 531                 goto err_xfer;
 532
 533         phys_addr = le32_to_cpu(resp->chan_addr_low);
 534         phys_addr |= (u64)le32_to_cpu(resp->chan_addr_high) << 32;
 535         addr = devm_ioremap(handle->dev, phys_addr, size);
 536         if (!addr)
 537                 goto err_xfer;
 538         *p_addr = addr;
 539
 540         if (p_db && SUPPORTS_DOORBELL(flags)) {
 541                 db = devm_kzalloc(handle->dev, sizeof(*db), GFP_KERNEL);
 542                 if (!db)
 543                         goto err_xfer;
 544
 545                 size = 1 << DOORBELL_REG_WIDTH(flags);
 546                 phys_addr = le32_to_cpu(resp->db_addr_low);
 547                 phys_addr |= (u64)le32_to_cpu(resp->db_addr_high) << 32;
 548                 addr = devm_ioremap(handle->dev, phys_addr, size);
 549                 if (!addr)
 550                         goto err_xfer;
 551
 552                 db->addr = addr;
 553                 db->width = size;
 554                 db->set = le32_to_cpu(resp->db_set_lmask);
 555                 db->set |= (u64)le32_to_cpu(resp->db_set_hmask) << 32;
 556                 db->mask = le32_to_cpu(resp->db_preserve_lmask);
 557                 db->mask |= (u64)le32_to_cpu(resp->db_preserve_hmask) << 32;
 558                 *p_db = db;
 559         }
 560 err_xfer:
 561         scmi_xfer_put(handle, t);
 562 }
 563
 564 static void scmi_perf_domain_init_fc(const struct scmi_handle *handle,
 565                                      u32 domain, struct scmi_fc_info **p_fc)
 566 {
 567         struct scmi_fc_info *fc;
 568
 569         fc = devm_kzalloc(handle->dev, sizeof(*fc), GFP_KERNEL);
 570         if (!fc)
 571                 return;
 572
 573         scmi_perf_domain_desc_fc(handle, domain, PERF_LEVEL_SET,
 574                                  &fc->level_set_addr, &fc->level_set_db);
 575         scmi_perf_domain_desc_fc(handle, domain, PERF_LEVEL_GET,
 576                                  &fc->level_get_addr, NULL);
 577         scmi_perf_domain_desc_fc(handle, domain, PERF_LIMITS_SET,
 578                                  &fc->limit_set_addr, &fc->limit_set_db);
 579         scmi_perf_domain_desc_fc(handle, domain, PERF_LIMITS_GET,
 580                                  &fc->limit_get_addr, NULL);
 581         *p_fc = fc;
 582 }
 583
 584 /* Device specific ops */
 585 static int scmi_dev_domain_id(struct device *dev)
 586 {
 587         struct of_phandle_args clkspec;
 588
 589         if (of_parse_phandle_with_args(dev->of_node, "clocks", "#clock-cells",
 590                                        0, &clkspec))
 591                 return -EINVAL;
 592
 593         return clkspec.args[0];
 594 }
 595
 596 static int scmi_dvfs_device_opps_add(const struct scmi_handle *handle,
 597                                      struct device *dev)
 598 {
 599         int idx, ret, domain;
 600         unsigned long freq;
 601         struct scmi_opp *opp;
 602         struct perf_dom_info *dom;
 603         struct scmi_perf_info *pi = handle->perf_priv;
 604
 605         domain = scmi_dev_domain_id(dev);
 606         if (domain < 0)
 607                 return domain;
 608
 609         dom = pi->dom_info + domain;
 610
 611         for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {
 612                 freq = opp->perf * dom->mult_factor;
 613
 614                 ret = dev_pm_opp_add(dev, freq, 0);
 615                 if (ret) {
 616                         dev_warn(dev, "failed to add opp %luHz\n", freq);
 617
 618                         while (idx-- > 0) {
 619                                 freq = (--opp)->perf * dom->mult_factor;
 620                                 dev_pm_opp_remove(dev, freq);
 621                         }
 622                         return ret;
 623                 }
 624         }
 625         return 0;
 626 }
 627
 628 static int scmi_dvfs_transition_latency_get(const struct scmi_handle *handle,
 629                                             struct device *dev)
 630 {
 631         struct perf_dom_info *dom;
 632         struct scmi_perf_info *pi = handle->perf_priv;
 633         int domain = scmi_dev_domain_id(dev);
 634
 635         if (domain < 0)
 636                 return domain;
 637
 638         dom = pi->dom_info + domain;
 639         /* uS to nS */
 640         return dom->opp[dom->opp_count - 1].trans_latency_us * 1000;
 641 }
 642
 643 static int scmi_dvfs_freq_set(const struct scmi_handle *handle, u32 domain,
 644                               unsigned long freq, bool poll)
 645 {
 646         struct scmi_perf_info *pi = handle->perf_priv;
 647         struct perf_dom_info *dom = pi->dom_info + domain;
 648
 649         return scmi_perf_level_set(handle, domain, freq / dom->mult_factor,
 650                                    poll);
 651 }
 652
 653 static int scmi_dvfs_freq_get(const struct scmi_handle *handle, u32 domain,
 654                               unsigned long *freq, bool poll)
 655 {
 656         int ret;
 657         u32 level;
 658         struct scmi_perf_info *pi = handle->perf_priv;
 659         struct perf_dom_info *dom = pi->dom_info + domain;
 660
 661         ret = scmi_perf_level_get(handle, domain, &level, poll);
 662         if (!ret)
 663                 *freq = level * dom->mult_factor;
 664
 665         return ret;
 666 }
 667
 668 static int scmi_dvfs_est_power_get(const struct scmi_handle *handle, u32 domain,
 669                                    unsigned long *freq, unsigned long *power)
 670 {
 671         struct scmi_perf_info *pi = handle->perf_priv;
 672         struct perf_dom_info *dom;
 673         unsigned long opp_freq;
 674         int idx, ret = -EINVAL;
 675         struct scmi_opp *opp;
 676
 677         dom = pi->dom_info + domain;
 678         if (!dom)
 679                 return -EIO;
 680
 681         for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {
 682                 opp_freq = opp->perf * dom->mult_factor;
 683                 if (opp_freq < *freq)
 684                         continue;
 685
 686                 *freq = opp_freq;
 687                 *power = opp->power;
 688                 ret = 0;
 689                 break;
 690         }
 691
 692         return ret;
 693 }
 694
 695 static struct scmi_perf_ops perf_ops = {
 696         .limits_set = scmi_perf_limits_set,
 697         .limits_get = scmi_perf_limits_get,
 698         .level_set = scmi_perf_level_set,
 699         .level_get = scmi_perf_level_get,
 700         .device_domain_id = scmi_dev_domain_id,
 701         .transition_latency_get = scmi_dvfs_transition_latency_get,
 702         .device_opps_add = scmi_dvfs_device_opps_add,
 703         .freq_set = scmi_dvfs_freq_set,
 704         .freq_get = scmi_dvfs_freq_get,
 705         .est_power_get = scmi_dvfs_est_power_get,
 706 };
 707
 708 static int scmi_perf_protocol_init(struct scmi_handle *handle)
 709 {
 710         int domain;
 711         u32 version;
 712         struct scmi_perf_info *pinfo;
 713
 714         scmi_version_get(handle, SCMI_PROTOCOL_PERF, &version);
 715
 716         dev_dbg(handle->dev, "Performance Version %d.%d\n",
 717                 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
 718
 719         pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
 720         if (!pinfo)
 721                 return -ENOMEM;
 722
 723         scmi_perf_attributes_get(handle, pinfo);
 724
 725         pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
 726                                        sizeof(*pinfo->dom_info), GFP_KERNEL);
 727         if (!pinfo->dom_info)
 728                 return -ENOMEM;
 729
 730         for (domain = 0; domain < pinfo->num_domains; domain++) {
 731                 struct perf_dom_info *dom = pinfo->dom_info + domain;
 732
 733                 scmi_perf_domain_attributes_get(handle, domain, dom);
 734                 scmi_perf_describe_levels_get(handle, domain, dom);
 735
 736                 if (dom->perf_fastchannels)
 737                         scmi_perf_domain_init_fc(handle, domain, &dom->fc_info);
 738         }
 739
 740         pinfo->version = version;
 741         handle->perf_ops = &perf_ops;
 742         handle->perf_priv = pinfo;
 743
 744         return 0;
 745 }
 746
 747 static int __init scmi_perf_init(void)
 748 {
 749         return scmi_protocol_register(SCMI_PROTOCOL_PERF,
 750                                       &scmi_perf_protocol_init);
 751 }
 752 subsys_initcall(scmi_perf_init);