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 #define pr_fmt(fmt) "SCMI Notifications PERF - " fmt
   9
  10 #include <linux/bits.h>
  11 #include <linux/of.h>
  12 #include <linux/io.h>
  13 #include <linux/io-64-nonatomic-hi-lo.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/pm_opp.h>
  16 #include <linux/scmi_protocol.h>
  17 #include <linux/sort.h>
  18
  19 #include "common.h"
  20 #include "notify.h"
  21
  22 enum scmi_performance_protocol_cmd {
  23         PERF_DOMAIN_ATTRIBUTES = 0x3,
  24         PERF_DESCRIBE_LEVELS = 0x4,
  25         PERF_LIMITS_SET = 0x5,
  26         PERF_LIMITS_GET = 0x6,
  27         PERF_LEVEL_SET = 0x7,
  28         PERF_LEVEL_GET = 0x8,
  29         PERF_NOTIFY_LIMITS = 0x9,
  30         PERF_NOTIFY_LEVEL = 0xa,
  31         PERF_DESCRIBE_FASTCHANNEL = 0xb,
  32 };
  33
  34 struct scmi_opp {
  35         u32 perf;
  36         u32 power;
  37         u32 trans_latency_us;
  38 };
  39
  40 struct scmi_msg_resp_perf_attributes {
  41         __le16 num_domains;
  42         __le16 flags;
  43 #define POWER_SCALE_IN_MILLIWATT(x)     ((x) & BIT(0))
  44         __le32 stats_addr_low;
  45         __le32 stats_addr_high;
  46         __le32 stats_size;
  47 };
  48
  49 struct scmi_msg_resp_perf_domain_attributes {
  50         __le32 flags;
  51 #define SUPPORTS_SET_LIMITS(x)          ((x) & BIT(31))
  52 #define SUPPORTS_SET_PERF_LVL(x)        ((x) & BIT(30))
  53 #define SUPPORTS_PERF_LIMIT_NOTIFY(x)   ((x) & BIT(29))
  54 #define SUPPORTS_PERF_LEVEL_NOTIFY(x)   ((x) & BIT(28))
  55 #define SUPPORTS_PERF_FASTCHANNELS(x)   ((x) & BIT(27))
  56         __le32 rate_limit_us;
  57         __le32 sustained_freq_khz;
  58         __le32 sustained_perf_level;
  59             u8 name[SCMI_MAX_STR_SIZE];
  60 };
  61
  62 struct scmi_msg_perf_describe_levels {
  63         __le32 domain;
  64         __le32 level_index;
  65 };
  66
  67 struct scmi_perf_set_limits {
  68         __le32 domain;
  69         __le32 max_level;
  70         __le32 min_level;
  71 };
  72
  73 struct scmi_perf_get_limits {
  74         __le32 max_level;
  75         __le32 min_level;
  76 };
  77
  78 struct scmi_perf_set_level {
  79         __le32 domain;
  80         __le32 level;
  81 };
  82
  83 struct scmi_perf_notify_level_or_limits {
  84         __le32 domain;
  85         __le32 notify_enable;
  86 };
  87
  88 struct scmi_perf_limits_notify_payld {
  89         __le32 agent_id;
  90         __le32 domain_id;
  91         __le32 range_max;
  92         __le32 range_min;
  93 };
  94
  95 struct scmi_perf_level_notify_payld {
  96         __le32 agent_id;
  97         __le32 domain_id;
  98         __le32 performance_level;
  99 };
 100
 101 struct scmi_msg_resp_perf_describe_levels {
 102         __le16 num_returned;
 103         __le16 num_remaining;
 104         struct {
 105                 __le32 perf_val;
 106                 __le32 power;
 107                 __le16 transition_latency_us;
 108                 __le16 reserved;
 109         } opp[];
 110 };
 111
 112 struct scmi_perf_get_fc_info {
 113         __le32 domain;
 114         __le32 message_id;
 115 };
 116
 117 struct scmi_msg_resp_perf_desc_fc {
 118         __le32 attr;
 119 #define SUPPORTS_DOORBELL(x)            ((x) & BIT(0))
 120 #define DOORBELL_REG_WIDTH(x)           FIELD_GET(GENMASK(2, 1), (x))
 121         __le32 rate_limit;
 122         __le32 chan_addr_low;
 123         __le32 chan_addr_high;
 124         __le32 chan_size;
 125         __le32 db_addr_low;
 126         __le32 db_addr_high;
 127         __le32 db_set_lmask;
 128         __le32 db_set_hmask;
 129         __le32 db_preserve_lmask;
 130         __le32 db_preserve_hmask;
 131 };
 132
 133 struct scmi_fc_db_info {
 134         int width;
 135         u64 set;
 136         u64 mask;
 137         void __iomem *addr;
 138 };
 139
 140 struct scmi_fc_info {
 141         void __iomem *level_set_addr;
 142         void __iomem *limit_set_addr;
 143         void __iomem *level_get_addr;
 144         void __iomem *limit_get_addr;
 145         struct scmi_fc_db_info *level_set_db;
 146         struct scmi_fc_db_info *limit_set_db;
 147 };
 148
 149 struct perf_dom_info {
 150         bool set_limits;
 151         bool set_perf;
 152         bool perf_limit_notify;
 153         bool perf_level_notify;
 154         bool perf_fastchannels;
 155         u32 opp_count;
 156         u32 sustained_freq_khz;
 157         u32 sustained_perf_level;
 158         u32 mult_factor;
 159         char name[SCMI_MAX_STR_SIZE];
 160         struct scmi_opp opp[MAX_OPPS];
 161         struct scmi_fc_info *fc_info;
 162 };
 163
 164 struct scmi_perf_info {
 165         u32 version;
 166         int num_domains;
 167         bool power_scale_mw;
 168         u64 stats_addr;
 169         u32 stats_size;
 170         struct perf_dom_info *dom_info;
 171 };
 172
 173 static enum scmi_performance_protocol_cmd evt_2_cmd[] = {
 174         PERF_NOTIFY_LIMITS,
 175         PERF_NOTIFY_LEVEL,
 176 };
 177
 178 static int scmi_perf_attributes_get(const struct scmi_handle *handle,
 179                                     struct scmi_perf_info *pi)
 180 {
 181         int ret;
 182         struct scmi_xfer *t;
 183         struct scmi_msg_resp_perf_attributes *attr;
 184
 185         ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
 186                                  SCMI_PROTOCOL_PERF, 0, sizeof(*attr), &t);
 187         if (ret)
 188                 return ret;
 189
 190         attr = t->rx.buf;
 191
 192         ret = scmi_do_xfer(handle, t);
 193         if (!ret) {
 194                 u16 flags = le16_to_cpu(attr->flags);
 195
 196                 pi->num_domains = le16_to_cpu(attr->num_domains);
 197                 pi->power_scale_mw = POWER_SCALE_IN_MILLIWATT(flags);
 198                 pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
 199                                 (u64)le32_to_cpu(attr->stats_addr_high) << 32;
 200                 pi->stats_size = le32_to_cpu(attr->stats_size);
 201         }
 202
 203         scmi_xfer_put(handle, t);
 204         return ret;
 205 }
 206
 207 static int
 208 scmi_perf_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
 209                                 struct perf_dom_info *dom_info)
 210 {
 211         int ret;
 212         struct scmi_xfer *t;
 213         struct scmi_msg_resp_perf_domain_attributes *attr;
 214
 215         ret = scmi_xfer_get_init(handle, PERF_DOMAIN_ATTRIBUTES,
 216                                  SCMI_PROTOCOL_PERF, sizeof(domain),
 217                                  sizeof(*attr), &t);
 218         if (ret)
 219                 return ret;
 220
 221         put_unaligned_le32(domain, t->tx.buf);
 222         attr = t->rx.buf;
 223
 224         ret = scmi_do_xfer(handle, t);
 225         if (!ret) {
 226                 u32 flags = le32_to_cpu(attr->flags);
 227
 228                 dom_info->set_limits = SUPPORTS_SET_LIMITS(flags);
 229                 dom_info->set_perf = SUPPORTS_SET_PERF_LVL(flags);
 230                 dom_info->perf_limit_notify = SUPPORTS_PERF_LIMIT_NOTIFY(flags);
 231                 dom_info->perf_level_notify = SUPPORTS_PERF_LEVEL_NOTIFY(flags);
 232                 dom_info->perf_fastchannels = SUPPORTS_PERF_FASTCHANNELS(flags);
 233                 dom_info->sustained_freq_khz =
 234                                         le32_to_cpu(attr->sustained_freq_khz);
 235                 dom_info->sustained_perf_level =
 236                                         le32_to_cpu(attr->sustained_perf_level);
 237                 if (!dom_info->sustained_freq_khz ||
 238                     !dom_info->sustained_perf_level)
 239                         /* CPUFreq converts to kHz, hence default 1000 */
 240                         dom_info->mult_factor = 1000;
 241                 else
 242                         dom_info->mult_factor =
 243                                         (dom_info->sustained_freq_khz * 1000) /
 244                                         dom_info->sustained_perf_level;
 245                 strlcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
 246         }
 247
 248         scmi_xfer_put(handle, t);
 249         return ret;
 250 }
 251
 252 static int opp_cmp_func(const void *opp1, const void *opp2)
 253 {
 254         const struct scmi_opp *t1 = opp1, *t2 = opp2;
 255
 256         return t1->perf - t2->perf;
 257 }
 258
 259 static int
 260 scmi_perf_describe_levels_get(const struct scmi_handle *handle, u32 domain,
 261                               struct perf_dom_info *perf_dom)
 262 {
 263         int ret, cnt;
 264         u32 tot_opp_cnt = 0;
 265         u16 num_returned, num_remaining;
 266         struct scmi_xfer *t;
 267         struct scmi_opp *opp;
 268         struct scmi_msg_perf_describe_levels *dom_info;
 269         struct scmi_msg_resp_perf_describe_levels *level_info;
 270
 271         ret = scmi_xfer_get_init(handle, PERF_DESCRIBE_LEVELS,
 272                                  SCMI_PROTOCOL_PERF, sizeof(*dom_info), 0, &t);
 273         if (ret)
 274                 return ret;
 275
 276         dom_info = t->tx.buf;
 277         level_info = t->rx.buf;
 278
 279         do {
 280                 dom_info->domain = cpu_to_le32(domain);
 281                 /* Set the number of OPPs to be skipped/already read */
 282                 dom_info->level_index = cpu_to_le32(tot_opp_cnt);
 283
 284                 ret = scmi_do_xfer(handle, t);
 285                 if (ret)
 286                         break;
 287
 288                 num_returned = le16_to_cpu(level_info->num_returned);
 289                 num_remaining = le16_to_cpu(level_info->num_remaining);
 290                 if (tot_opp_cnt + num_returned > MAX_OPPS) {
 291                         dev_err(handle->dev, "No. of OPPs exceeded MAX_OPPS");
 292                         break;
 293                 }
 294
 295                 opp = &perf_dom->opp[tot_opp_cnt];
 296                 for (cnt = 0; cnt < num_returned; cnt++, opp++) {
 297                         opp->perf = le32_to_cpu(level_info->opp[cnt].perf_val);
 298                         opp->power = le32_to_cpu(level_info->opp[cnt].power);
 299                         opp->trans_latency_us = le16_to_cpu
 300                                 (level_info->opp[cnt].transition_latency_us);
 301
 302                         dev_dbg(handle->dev, "Level %d Power %d Latency %dus\n",
 303                                 opp->perf, opp->power, opp->trans_latency_us);
 304                 }
 305
 306                 tot_opp_cnt += num_returned;
 307
 308                 scmi_reset_rx_to_maxsz(handle, t);
 309                 /*
 310                  * check for both returned and remaining to avoid infinite
 311                  * loop due to buggy firmware
 312                  */
 313         } while (num_returned && num_remaining);
 314
 315         perf_dom->opp_count = tot_opp_cnt;
 316         scmi_xfer_put(handle, t);
 317
 318         sort(perf_dom->opp, tot_opp_cnt, sizeof(*opp), opp_cmp_func, NULL);
 319         return ret;
 320 }
 321
 322 #define SCMI_PERF_FC_RING_DB(w)                         \
 323 do {                                                    \
 324         u##w val = 0;                                   \
 325                                                         \
 326         if (db->mask)                                   \
 327                 val = ioread##w(db->addr) & db->mask;   \
 328         iowrite##w((u##w)db->set | val, db->addr);      \
 329 } while (0)
 330
 331 static void scmi_perf_fc_ring_db(struct scmi_fc_db_info *db)
 332 {
 333         if (!db || !db->addr)
 334                 return;
 335
 336         if (db->width == 1)
 337                 SCMI_PERF_FC_RING_DB(8);
 338         else if (db->width == 2)
 339                 SCMI_PERF_FC_RING_DB(16);
 340         else if (db->width == 4)
 341                 SCMI_PERF_FC_RING_DB(32);
 342         else /* db->width == 8 */
 343 #ifdef CONFIG_64BIT
 344                 SCMI_PERF_FC_RING_DB(64);
 345 #else
 346         {
 347                 u64 val = 0;
 348
 349                 if (db->mask)
 350                         val = ioread64_hi_lo(db->addr) & db->mask;
 351                 iowrite64_hi_lo(db->set | val, db->addr);
 352         }
 353 #endif
 354 }
 355
 356 static int scmi_perf_mb_limits_set(const struct scmi_handle *handle, u32 domain,
 357                                    u32 max_perf, u32 min_perf)
 358 {
 359         int ret;
 360         struct scmi_xfer *t;
 361         struct scmi_perf_set_limits *limits;
 362
 363         ret = scmi_xfer_get_init(handle, PERF_LIMITS_SET, SCMI_PROTOCOL_PERF,
 364                                  sizeof(*limits), 0, &t);
 365         if (ret)
 366                 return ret;
 367
 368         limits = t->tx.buf;
 369         limits->domain = cpu_to_le32(domain);
 370         limits->max_level = cpu_to_le32(max_perf);
 371         limits->min_level = cpu_to_le32(min_perf);
 372
 373         ret = scmi_do_xfer(handle, t);
 374
 375         scmi_xfer_put(handle, t);
 376         return ret;
 377 }
 378
 379 static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
 380                                 u32 max_perf, u32 min_perf)
 381 {
 382         struct scmi_perf_info *pi = handle->perf_priv;
 383         struct perf_dom_info *dom = pi->dom_info + domain;
 384
 385         if (dom->fc_info && dom->fc_info->limit_set_addr) {
 386                 iowrite32(max_perf, dom->fc_info->limit_set_addr);
 387                 iowrite32(min_perf, dom->fc_info->limit_set_addr + 4);
 388                 scmi_perf_fc_ring_db(dom->fc_info->limit_set_db);
 389                 return 0;
 390         }
 391
 392         return scmi_perf_mb_limits_set(handle, domain, max_perf, min_perf);
 393 }
 394
 395 static int scmi_perf_mb_limits_get(const struct scmi_handle *handle, u32 domain,
 396                                    u32 *max_perf, u32 *min_perf)
 397 {
 398         int ret;
 399         struct scmi_xfer *t;
 400         struct scmi_perf_get_limits *limits;
 401
 402         ret = scmi_xfer_get_init(handle, PERF_LIMITS_GET, SCMI_PROTOCOL_PERF,
 403                                  sizeof(__le32), 0, &t);
 404         if (ret)
 405                 return ret;
 406
 407         put_unaligned_le32(domain, t->tx.buf);
 408
 409         ret = scmi_do_xfer(handle, t);
 410         if (!ret) {
 411                 limits = t->rx.buf;
 412
 413                 *max_perf = le32_to_cpu(limits->max_level);
 414                 *min_perf = le32_to_cpu(limits->min_level);
 415         }
 416
 417         scmi_xfer_put(handle, t);
 418         return ret;
 419 }
 420
 421 static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
 422                                 u32 *max_perf, u32 *min_perf)
 423 {
 424         struct scmi_perf_info *pi = handle->perf_priv;
 425         struct perf_dom_info *dom = pi->dom_info + domain;
 426
 427         if (dom->fc_info && dom->fc_info->limit_get_addr) {
 428                 *max_perf = ioread32(dom->fc_info->limit_get_addr);
 429                 *min_perf = ioread32(dom->fc_info->limit_get_addr + 4);
 430                 return 0;
 431         }
 432
 433         return scmi_perf_mb_limits_get(handle, domain, max_perf, min_perf);
 434 }
 435
 436 static int scmi_perf_mb_level_set(const struct scmi_handle *handle, u32 domain,
 437                                   u32 level, bool poll)
 438 {
 439         int ret;
 440         struct scmi_xfer *t;
 441         struct scmi_perf_set_level *lvl;
 442
 443         ret = scmi_xfer_get_init(handle, PERF_LEVEL_SET, SCMI_PROTOCOL_PERF,
 444                                  sizeof(*lvl), 0, &t);
 445         if (ret)
 446                 return ret;
 447
 448         t->hdr.poll_completion = poll;
 449         lvl = t->tx.buf;
 450         lvl->domain = cpu_to_le32(domain);
 451         lvl->level = cpu_to_le32(level);
 452
 453         ret = scmi_do_xfer(handle, t);
 454
 455         scmi_xfer_put(handle, t);
 456         return ret;
 457 }
 458
 459 static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
 460                                u32 level, bool poll)
 461 {
 462         struct scmi_perf_info *pi = handle->perf_priv;
 463         struct perf_dom_info *dom = pi->dom_info + domain;
 464
 465         if (dom->fc_info && dom->fc_info->level_set_addr) {
 466                 iowrite32(level, dom->fc_info->level_set_addr);
 467                 scmi_perf_fc_ring_db(dom->fc_info->level_set_db);
 468                 return 0;
 469         }
 470
 471         return scmi_perf_mb_level_set(handle, domain, level, poll);
 472 }
 473
 474 static int scmi_perf_mb_level_get(const struct scmi_handle *handle, u32 domain,
 475                                   u32 *level, bool poll)
 476 {
 477         int ret;
 478         struct scmi_xfer *t;
 479
 480         ret = scmi_xfer_get_init(handle, PERF_LEVEL_GET, SCMI_PROTOCOL_PERF,
 481                                  sizeof(u32), sizeof(u32), &t);
 482         if (ret)
 483                 return ret;
 484
 485         t->hdr.poll_completion = poll;
 486         put_unaligned_le32(domain, t->tx.buf);
 487
 488         ret = scmi_do_xfer(handle, t);
 489         if (!ret)
 490                 *level = get_unaligned_le32(t->rx.buf);
 491
 492         scmi_xfer_put(handle, t);
 493         return ret;
 494 }
 495
 496 static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
 497                                u32 *level, bool poll)
 498 {
 499         struct scmi_perf_info *pi = handle->perf_priv;
 500         struct perf_dom_info *dom = pi->dom_info + domain;
 501
 502         if (dom->fc_info && dom->fc_info->level_get_addr) {
 503                 *level = ioread32(dom->fc_info->level_get_addr);
 504                 return 0;
 505         }
 506
 507         return scmi_perf_mb_level_get(handle, domain, level, poll);
 508 }
 509
 510 static int scmi_perf_level_limits_notify(const struct scmi_handle *handle,
 511                                          u32 domain, int message_id,
 512                                          bool enable)
 513 {
 514         int ret;
 515         struct scmi_xfer *t;
 516         struct scmi_perf_notify_level_or_limits *notify;
 517
 518         ret = scmi_xfer_get_init(handle, message_id, SCMI_PROTOCOL_PERF,
 519                                  sizeof(*notify), 0, &t);
 520         if (ret)
 521                 return ret;
 522
 523         notify = t->tx.buf;
 524         notify->domain = cpu_to_le32(domain);
 525         notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0;
 526
 527         ret = scmi_do_xfer(handle, t);
 528
 529         scmi_xfer_put(handle, t);
 530         return ret;
 531 }
 532
 533 static bool scmi_perf_fc_size_is_valid(u32 msg, u32 size)
 534 {
 535         if ((msg == PERF_LEVEL_GET || msg == PERF_LEVEL_SET) && size == 4)
 536                 return true;
 537         if ((msg == PERF_LIMITS_GET || msg == PERF_LIMITS_SET) && size == 8)
 538                 return true;
 539         return false;
 540 }
 541
 542 static void
 543 scmi_perf_domain_desc_fc(const struct scmi_handle *handle, u32 domain,
 544                          u32 message_id, void __iomem **p_addr,
 545                          struct scmi_fc_db_info **p_db)
 546 {
 547         int ret;
 548         u32 flags;
 549         u64 phys_addr;
 550         u8 size;
 551         void __iomem *addr;
 552         struct scmi_xfer *t;
 553         struct scmi_fc_db_info *db;
 554         struct scmi_perf_get_fc_info *info;
 555         struct scmi_msg_resp_perf_desc_fc *resp;
 556
 557         if (!p_addr)
 558                 return;
 559
 560         ret = scmi_xfer_get_init(handle, PERF_DESCRIBE_FASTCHANNEL,
 561                                  SCMI_PROTOCOL_PERF,
 562                                  sizeof(*info), sizeof(*resp), &t);
 563         if (ret)
 564                 return;
 565
 566         info = t->tx.buf;
 567         info->domain = cpu_to_le32(domain);
 568         info->message_id = cpu_to_le32(message_id);
 569
 570         ret = scmi_do_xfer(handle, t);
 571         if (ret)
 572                 goto err_xfer;
 573
 574         resp = t->rx.buf;
 575         flags = le32_to_cpu(resp->attr);
 576         size = le32_to_cpu(resp->chan_size);
 577         if (!scmi_perf_fc_size_is_valid(message_id, size))
 578                 goto err_xfer;
 579
 580         phys_addr = le32_to_cpu(resp->chan_addr_low);
 581         phys_addr |= (u64)le32_to_cpu(resp->chan_addr_high) << 32;
 582         addr = devm_ioremap(handle->dev, phys_addr, size);
 583         if (!addr)
 584                 goto err_xfer;
 585         *p_addr = addr;
 586
 587         if (p_db && SUPPORTS_DOORBELL(flags)) {
 588                 db = devm_kzalloc(handle->dev, sizeof(*db), GFP_KERNEL);
 589                 if (!db)
 590                         goto err_xfer;
 591
 592                 size = 1 << DOORBELL_REG_WIDTH(flags);
 593                 phys_addr = le32_to_cpu(resp->db_addr_low);
 594                 phys_addr |= (u64)le32_to_cpu(resp->db_addr_high) << 32;
 595                 addr = devm_ioremap(handle->dev, phys_addr, size);
 596                 if (!addr)
 597                         goto err_xfer;
 598
 599                 db->addr = addr;
 600                 db->width = size;
 601                 db->set = le32_to_cpu(resp->db_set_lmask);
 602                 db->set |= (u64)le32_to_cpu(resp->db_set_hmask) << 32;
 603                 db->mask = le32_to_cpu(resp->db_preserve_lmask);
 604                 db->mask |= (u64)le32_to_cpu(resp->db_preserve_hmask) << 32;
 605                 *p_db = db;
 606         }
 607 err_xfer:
 608         scmi_xfer_put(handle, t);
 609 }
 610
 611 static void scmi_perf_domain_init_fc(const struct scmi_handle *handle,
 612                                      u32 domain, struct scmi_fc_info **p_fc)
 613 {
 614         struct scmi_fc_info *fc;
 615
 616         fc = devm_kzalloc(handle->dev, sizeof(*fc), GFP_KERNEL);
 617         if (!fc)
 618                 return;
 619
 620         scmi_perf_domain_desc_fc(handle, domain, PERF_LEVEL_SET,
 621                                  &fc->level_set_addr, &fc->level_set_db);
 622         scmi_perf_domain_desc_fc(handle, domain, PERF_LEVEL_GET,
 623                                  &fc->level_get_addr, NULL);
 624         scmi_perf_domain_desc_fc(handle, domain, PERF_LIMITS_SET,
 625                                  &fc->limit_set_addr, &fc->limit_set_db);
 626         scmi_perf_domain_desc_fc(handle, domain, PERF_LIMITS_GET,
 627                                  &fc->limit_get_addr, NULL);
 628         *p_fc = fc;
 629 }
 630
 631 /* Device specific ops */
 632 static int scmi_dev_domain_id(struct device *dev)
 633 {
 634         struct of_phandle_args clkspec;
 635
 636         if (of_parse_phandle_with_args(dev->of_node, "clocks", "#clock-cells",
 637                                        0, &clkspec))
 638                 return -EINVAL;
 639
 640         return clkspec.args[0];
 641 }
 642
 643 static int scmi_dvfs_device_opps_add(const struct scmi_handle *handle,
 644                                      struct device *dev)
 645 {
 646         int idx, ret, domain;
 647         unsigned long freq;
 648         struct scmi_opp *opp;
 649         struct perf_dom_info *dom;
 650         struct scmi_perf_info *pi = handle->perf_priv;
 651
 652         domain = scmi_dev_domain_id(dev);
 653         if (domain < 0)
 654                 return domain;
 655
 656         dom = pi->dom_info + domain;
 657
 658         for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {
 659                 freq = opp->perf * dom->mult_factor;
 660
 661                 ret = dev_pm_opp_add(dev, freq, 0);
 662                 if (ret) {
 663                         dev_warn(dev, "failed to add opp %luHz\n", freq);
 664
 665                         while (idx-- > 0) {
 666                                 freq = (--opp)->perf * dom->mult_factor;
 667                                 dev_pm_opp_remove(dev, freq);
 668                         }
 669                         return ret;
 670                 }
 671         }
 672         return 0;
 673 }
 674
 675 static int scmi_dvfs_transition_latency_get(const struct scmi_handle *handle,
 676                                             struct device *dev)
 677 {
 678         struct perf_dom_info *dom;
 679         struct scmi_perf_info *pi = handle->perf_priv;
 680         int domain = scmi_dev_domain_id(dev);
 681
 682         if (domain < 0)
 683                 return domain;
 684
 685         dom = pi->dom_info + domain;
 686         /* uS to nS */
 687         return dom->opp[dom->opp_count - 1].trans_latency_us * 1000;
 688 }
 689
 690 static int scmi_dvfs_freq_set(const struct scmi_handle *handle, u32 domain,
 691                               unsigned long freq, bool poll)
 692 {
 693         struct scmi_perf_info *pi = handle->perf_priv;
 694         struct perf_dom_info *dom = pi->dom_info + domain;
 695
 696         return scmi_perf_level_set(handle, domain, freq / dom->mult_factor,
 697                                    poll);
 698 }
 699
 700 static int scmi_dvfs_freq_get(const struct scmi_handle *handle, u32 domain,
 701                               unsigned long *freq, bool poll)
 702 {
 703         int ret;
 704         u32 level;
 705         struct scmi_perf_info *pi = handle->perf_priv;
 706         struct perf_dom_info *dom = pi->dom_info + domain;
 707
 708         ret = scmi_perf_level_get(handle, domain, &level, poll);
 709         if (!ret)
 710                 *freq = level * dom->mult_factor;
 711
 712         return ret;
 713 }
 714
 715 static int scmi_dvfs_est_power_get(const struct scmi_handle *handle, u32 domain,
 716                                    unsigned long *freq, unsigned long *power)
 717 {
 718         struct scmi_perf_info *pi = handle->perf_priv;
 719         struct perf_dom_info *dom;
 720         unsigned long opp_freq;
 721         int idx, ret = -EINVAL;
 722         struct scmi_opp *opp;
 723
 724         dom = pi->dom_info + domain;
 725         if (!dom)
 726                 return -EIO;
 727
 728         for (opp = dom->opp, idx = 0; idx < dom->opp_count; idx++, opp++) {
 729                 opp_freq = opp->perf * dom->mult_factor;
 730                 if (opp_freq < *freq)
 731                         continue;
 732
 733                 *freq = opp_freq;
 734                 *power = opp->power;
 735                 ret = 0;
 736                 break;
 737         }
 738
 739         return ret;
 740 }
 741
 742 static bool scmi_fast_switch_possible(const struct scmi_handle *handle,
 743                                       struct device *dev)
 744 {
 745         struct perf_dom_info *dom;
 746         struct scmi_perf_info *pi = handle->perf_priv;
 747
 748         dom = pi->dom_info + scmi_dev_domain_id(dev);
 749
 750         return dom->fc_info && dom->fc_info->level_set_addr;
 751 }
 752
 753 static const struct scmi_perf_ops perf_ops = {
 754         .limits_set = scmi_perf_limits_set,
 755         .limits_get = scmi_perf_limits_get,
 756         .level_set = scmi_perf_level_set,
 757         .level_get = scmi_perf_level_get,
 758         .device_domain_id = scmi_dev_domain_id,
 759         .transition_latency_get = scmi_dvfs_transition_latency_get,
 760         .device_opps_add = scmi_dvfs_device_opps_add,
 761         .freq_set = scmi_dvfs_freq_set,
 762         .freq_get = scmi_dvfs_freq_get,
 763         .est_power_get = scmi_dvfs_est_power_get,
 764         .fast_switch_possible = scmi_fast_switch_possible,
 765 };
 766
 767 static int scmi_perf_set_notify_enabled(const struct scmi_handle *handle,
 768                                         u8 evt_id, u32 src_id, bool enable)
 769 {
 770         int ret, cmd_id;
 771
 772         if (evt_id >= ARRAY_SIZE(evt_2_cmd))
 773                 return -EINVAL;
 774
 775         cmd_id = evt_2_cmd[evt_id];
 776         ret = scmi_perf_level_limits_notify(handle, src_id, cmd_id, enable);
 777         if (ret)
 778                 pr_debug("FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
 779                          evt_id, src_id, ret);
 780
 781         return ret;
 782 }
 783
 784 static void *scmi_perf_fill_custom_report(const struct scmi_handle *handle,
 785                                           u8 evt_id, ktime_t timestamp,
 786                                           const void *payld, size_t payld_sz,
 787                                           void *report, u32 *src_id)
 788 {
 789         void *rep = NULL;
 790
 791         switch (evt_id) {
 792         case SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED:
 793         {
 794                 const struct scmi_perf_limits_notify_payld *p = payld;
 795                 struct scmi_perf_limits_report *r = report;
 796
 797                 if (sizeof(*p) != payld_sz)
 798                         break;
 799
 800                 r->timestamp = timestamp;
 801                 r->agent_id = le32_to_cpu(p->agent_id);
 802                 r->domain_id = le32_to_cpu(p->domain_id);
 803                 r->range_max = le32_to_cpu(p->range_max);
 804                 r->range_min = le32_to_cpu(p->range_min);
 805                 *src_id = r->domain_id;
 806                 rep = r;
 807                 break;
 808         }
 809         case SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED:
 810         {
 811                 const struct scmi_perf_level_notify_payld *p = payld;
 812                 struct scmi_perf_level_report *r = report;
 813
 814                 if (sizeof(*p) != payld_sz)
 815                         break;
 816
 817                 r->timestamp = timestamp;
 818                 r->agent_id = le32_to_cpu(p->agent_id);
 819                 r->domain_id = le32_to_cpu(p->domain_id);
 820                 r->performance_level = le32_to_cpu(p->performance_level);
 821                 *src_id = r->domain_id;
 822                 rep = r;
 823                 break;
 824         }
 825         default:
 826                 break;
 827         }
 828
 829         return rep;
 830 }
 831
 832 static const struct scmi_event perf_events[] = {
 833         {
 834                 .id = SCMI_EVENT_PERFORMANCE_LIMITS_CHANGED,
 835                 .max_payld_sz = sizeof(struct scmi_perf_limits_notify_payld),
 836                 .max_report_sz = sizeof(struct scmi_perf_limits_report),
 837         },
 838         {
 839                 .id = SCMI_EVENT_PERFORMANCE_LEVEL_CHANGED,
 840                 .max_payld_sz = sizeof(struct scmi_perf_level_notify_payld),
 841                 .max_report_sz = sizeof(struct scmi_perf_level_report),
 842         },
 843 };
 844
 845 static const struct scmi_event_ops perf_event_ops = {
 846         .set_notify_enabled = scmi_perf_set_notify_enabled,
 847         .fill_custom_report = scmi_perf_fill_custom_report,
 848 };
 849
 850 static int scmi_perf_protocol_init(struct scmi_handle *handle)
 851 {
 852         int domain;
 853         u32 version;
 854         struct scmi_perf_info *pinfo;
 855
 856         scmi_version_get(handle, SCMI_PROTOCOL_PERF, &version);
 857
 858         dev_dbg(handle->dev, "Performance Version %d.%d\n",
 859                 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
 860
 861         pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
 862         if (!pinfo)
 863                 return -ENOMEM;
 864
 865         scmi_perf_attributes_get(handle, pinfo);
 866
 867         pinfo->dom_info = devm_kcalloc(handle->dev, pinfo->num_domains,
 868                                        sizeof(*pinfo->dom_info), GFP_KERNEL);
 869         if (!pinfo->dom_info)
 870                 return -ENOMEM;
 871
 872         for (domain = 0; domain < pinfo->num_domains; domain++) {
 873                 struct perf_dom_info *dom = pinfo->dom_info + domain;
 874
 875                 scmi_perf_domain_attributes_get(handle, domain, dom);
 876                 scmi_perf_describe_levels_get(handle, domain, dom);
 877
 878                 if (dom->perf_fastchannels)
 879                         scmi_perf_domain_init_fc(handle, domain, &dom->fc_info);
 880         }
 881
 882         scmi_register_protocol_events(handle,
 883                                       SCMI_PROTOCOL_PERF, SCMI_PROTO_QUEUE_SZ,
 884                                       &perf_event_ops, perf_events,
 885                                       ARRAY_SIZE(perf_events),
 886                                       pinfo->num_domains);
 887
 888         pinfo->version = version;
 889         handle->perf_ops = &perf_ops;
 890         handle->perf_priv = pinfo;
 891
 892         return 0;
 893 }
 894
 895 DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(SCMI_PROTOCOL_PERF, perf)