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