drivers/soc/qcom/rpmhpd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2018, The Linux Foundation. All rights reserved.*/
   3
   4 #include <linux/err.h>
   5 #include <linux/init.h>
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/mutex.h>
   9 #include <linux/pm_domain.h>
  10 #include <linux/slab.h>
  11 #include <linux/of.h>
  12 #include <linux/of_device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/pm_opp.h>
  15 #include <soc/qcom/cmd-db.h>
  16 #include <soc/qcom/rpmh.h>
  17 #include <dt-bindings/power/qcom-rpmpd.h>
  18
  19 #define domain_to_rpmhpd(domain) container_of(domain, struct rpmhpd, pd)
  20
  21 #define RPMH_ARC_MAX_LEVELS     16
  22
  23 /**
  24  * struct rpmhpd - top level RPMh power domain resource data structure
  25  * @dev:                rpmh power domain controller device
  26  * @pd:                 generic_pm_domain corrresponding to the power domain
  27  * @parent:             generic_pm_domain corrresponding to the parent's power domain
  28  * @peer:               A peer power domain in case Active only Voting is
  29  *                      supported
  30  * @active_only:        True if it represents an Active only peer
  31  * @corner:             current corner
  32  * @active_corner:      current active corner
  33  * @level:              An array of level (vlvl) to corner (hlvl) mappings
  34  *                      derived from cmd-db
  35  * @level_count:        Number of levels supported by the power domain. max
  36  *                      being 16 (0 - 15)
  37  * @enabled:            true if the power domain is enabled
  38  * @res_name:           Resource name used for cmd-db lookup
  39  * @addr:               Resource address as looped up using resource name from
  40  *                      cmd-db
  41  */
  42 struct rpmhpd {
  43         struct device   *dev;
  44         struct generic_pm_domain pd;
  45         struct generic_pm_domain *parent;
  46         struct rpmhpd   *peer;
  47         const bool      active_only;
  48         unsigned int    corner;
  49         unsigned int    active_corner;
  50         u32             level[RPMH_ARC_MAX_LEVELS];
  51         size_t          level_count;
  52         bool            enabled;
  53         const char      *res_name;
  54         u32             addr;
  55 };
  56
  57 struct rpmhpd_desc {
  58         struct rpmhpd **rpmhpds;
  59         size_t num_pds;
  60 };
  61
  62 static DEFINE_MUTEX(rpmhpd_lock);
  63
  64 /* SDM845 RPMH powerdomains */
  65
  66 static struct rpmhpd sdm845_ebi = {
  67         .pd = { .name = "ebi", },
  68         .res_name = "ebi.lvl",
  69 };
  70
  71 static struct rpmhpd sdm845_lmx = {
  72         .pd = { .name = "lmx", },
  73         .res_name = "lmx.lvl",
  74 };
  75
  76 static struct rpmhpd sdm845_lcx = {
  77         .pd = { .name = "lcx", },
  78         .res_name = "lcx.lvl",
  79 };
  80
  81 static struct rpmhpd sdm845_gfx = {
  82         .pd = { .name = "gfx", },
  83         .res_name = "gfx.lvl",
  84 };
  85
  86 static struct rpmhpd sdm845_mss = {
  87         .pd = { .name = "mss", },
  88         .res_name = "mss.lvl",
  89 };
  90
  91 static struct rpmhpd sdm845_mx_ao;
  92 static struct rpmhpd sdm845_mx = {
  93         .pd = { .name = "mx", },
  94         .peer = &sdm845_mx_ao,
  95         .res_name = "mx.lvl",
  96 };
  97
  98 static struct rpmhpd sdm845_mx_ao = {
  99         .pd = { .name = "mx_ao", },
 100         .active_only = true,
 101         .peer = &sdm845_mx,
 102         .res_name = "mx.lvl",
 103 };
 104
 105 static struct rpmhpd sdm845_cx_ao;
 106 static struct rpmhpd sdm845_cx = {
 107         .pd = { .name = "cx", },
 108         .peer = &sdm845_cx_ao,
 109         .parent = &sdm845_mx.pd,
 110         .res_name = "cx.lvl",
 111 };
 112
 113 static struct rpmhpd sdm845_cx_ao = {
 114         .pd = { .name = "cx_ao", },
 115         .active_only = true,
 116         .peer = &sdm845_cx,
 117         .parent = &sdm845_mx_ao.pd,
 118         .res_name = "cx.lvl",
 119 };
 120
 121 static struct rpmhpd *sdm845_rpmhpds[] = {
 122         [SDM845_EBI] = &sdm845_ebi,
 123         [SDM845_MX] = &sdm845_mx,
 124         [SDM845_MX_AO] = &sdm845_mx_ao,
 125         [SDM845_CX] = &sdm845_cx,
 126         [SDM845_CX_AO] = &sdm845_cx_ao,
 127         [SDM845_LMX] = &sdm845_lmx,
 128         [SDM845_LCX] = &sdm845_lcx,
 129         [SDM845_GFX] = &sdm845_gfx,
 130         [SDM845_MSS] = &sdm845_mss,
 131 };
 132
 133 static const struct rpmhpd_desc sdm845_desc = {
 134         .rpmhpds = sdm845_rpmhpds,
 135         .num_pds = ARRAY_SIZE(sdm845_rpmhpds),
 136 };
 137
 138 /* SDX55 RPMH powerdomains */
 139 static struct rpmhpd *sdx55_rpmhpds[] = {
 140         [SDX55_MSS] = &sdm845_mss,
 141         [SDX55_MX] = &sdm845_mx,
 142         [SDX55_CX] = &sdm845_cx,
 143 };
 144
 145 static const struct rpmhpd_desc sdx55_desc = {
 146         .rpmhpds = sdx55_rpmhpds,
 147         .num_pds = ARRAY_SIZE(sdx55_rpmhpds),
 148 };
 149
 150 /* SM8150 RPMH powerdomains */
 151
 152 static struct rpmhpd sm8150_mmcx_ao;
 153 static struct rpmhpd sm8150_mmcx = {
 154         .pd = { .name = "mmcx", },
 155         .peer = &sm8150_mmcx_ao,
 156         .res_name = "mmcx.lvl",
 157 };
 158
 159 static struct rpmhpd sm8150_mmcx_ao = {
 160         .pd = { .name = "mmcx_ao", },
 161         .active_only = true,
 162         .peer = &sm8150_mmcx,
 163         .res_name = "mmcx.lvl",
 164 };
 165
 166 static struct rpmhpd *sm8150_rpmhpds[] = {
 167         [SM8150_MSS] = &sdm845_mss,
 168         [SM8150_EBI] = &sdm845_ebi,
 169         [SM8150_LMX] = &sdm845_lmx,
 170         [SM8150_LCX] = &sdm845_lcx,
 171         [SM8150_GFX] = &sdm845_gfx,
 172         [SM8150_MX] = &sdm845_mx,
 173         [SM8150_MX_AO] = &sdm845_mx_ao,
 174         [SM8150_CX] = &sdm845_cx,
 175         [SM8150_CX_AO] = &sdm845_cx_ao,
 176         [SM8150_MMCX] = &sm8150_mmcx,
 177         [SM8150_MMCX_AO] = &sm8150_mmcx_ao,
 178 };
 179
 180 static const struct rpmhpd_desc sm8150_desc = {
 181         .rpmhpds = sm8150_rpmhpds,
 182         .num_pds = ARRAY_SIZE(sm8150_rpmhpds),
 183 };
 184
 185 static struct rpmhpd *sm8250_rpmhpds[] = {
 186         [SM8250_CX] = &sdm845_cx,
 187         [SM8250_CX_AO] = &sdm845_cx_ao,
 188         [SM8250_EBI] = &sdm845_ebi,
 189         [SM8250_GFX] = &sdm845_gfx,
 190         [SM8250_LCX] = &sdm845_lcx,
 191         [SM8250_LMX] = &sdm845_lmx,
 192         [SM8250_MMCX] = &sm8150_mmcx,
 193         [SM8250_MMCX_AO] = &sm8150_mmcx_ao,
 194         [SM8250_MX] = &sdm845_mx,
 195         [SM8250_MX_AO] = &sdm845_mx_ao,
 196 };
 197
 198 static const struct rpmhpd_desc sm8250_desc = {
 199         .rpmhpds = sm8250_rpmhpds,
 200         .num_pds = ARRAY_SIZE(sm8250_rpmhpds),
 201 };
 202
 203 /* SM8350 Power domains */
 204 static struct rpmhpd sm8350_mxc_ao;
 205 static struct rpmhpd sm8350_mxc = {
 206         .pd = { .name = "mxc", },
 207         .peer = &sm8150_mmcx_ao,
 208         .res_name = "mxc.lvl",
 209 };
 210
 211 static struct rpmhpd sm8350_mxc_ao = {
 212         .pd = { .name = "mxc_ao", },
 213         .active_only = true,
 214         .peer = &sm8350_mxc,
 215         .res_name = "mxc.lvl",
 216 };
 217
 218 static struct rpmhpd *sm8350_rpmhpds[] = {
 219         [SM8350_CX] = &sdm845_cx,
 220         [SM8350_CX_AO] = &sdm845_cx_ao,
 221         [SM8350_EBI] = &sdm845_ebi,
 222         [SM8350_GFX] = &sdm845_gfx,
 223         [SM8350_LCX] = &sdm845_lcx,
 224         [SM8350_LMX] = &sdm845_lmx,
 225         [SM8350_MMCX] = &sm8150_mmcx,
 226         [SM8350_MMCX_AO] = &sm8150_mmcx_ao,
 227         [SM8350_MX] = &sdm845_mx,
 228         [SM8350_MX_AO] = &sdm845_mx_ao,
 229         [SM8350_MXC] = &sm8350_mxc,
 230         [SM8350_MXC_AO] = &sm8350_mxc_ao,
 231         [SM8350_MSS] = &sdm845_mss,
 232 };
 233
 234 static const struct rpmhpd_desc sm8350_desc = {
 235         .rpmhpds = sm8350_rpmhpds,
 236         .num_pds = ARRAY_SIZE(sm8350_rpmhpds),
 237 };
 238
 239 /* SC7180 RPMH powerdomains */
 240 static struct rpmhpd *sc7180_rpmhpds[] = {
 241         [SC7180_CX] = &sdm845_cx,
 242         [SC7180_CX_AO] = &sdm845_cx_ao,
 243         [SC7180_GFX] = &sdm845_gfx,
 244         [SC7180_MX] = &sdm845_mx,
 245         [SC7180_MX_AO] = &sdm845_mx_ao,
 246         [SC7180_LMX] = &sdm845_lmx,
 247         [SC7180_LCX] = &sdm845_lcx,
 248         [SC7180_MSS] = &sdm845_mss,
 249 };
 250
 251 static const struct rpmhpd_desc sc7180_desc = {
 252         .rpmhpds = sc7180_rpmhpds,
 253         .num_pds = ARRAY_SIZE(sc7180_rpmhpds),
 254 };
 255
 256 /* SC7280 RPMH powerdomains */
 257 static struct rpmhpd *sc7280_rpmhpds[] = {
 258         [SC7280_CX] = &sdm845_cx,
 259         [SC7280_CX_AO] = &sdm845_cx_ao,
 260         [SC7280_EBI] = &sdm845_ebi,
 261         [SC7280_GFX] = &sdm845_gfx,
 262         [SC7280_MX] = &sdm845_mx,
 263         [SC7280_MX_AO] = &sdm845_mx_ao,
 264         [SC7280_LMX] = &sdm845_lmx,
 265         [SC7280_LCX] = &sdm845_lcx,
 266         [SC7280_MSS] = &sdm845_mss,
 267 };
 268
 269 static const struct rpmhpd_desc sc7280_desc = {
 270         .rpmhpds = sc7280_rpmhpds,
 271         .num_pds = ARRAY_SIZE(sc7280_rpmhpds),
 272 };
 273
 274 static const struct of_device_id rpmhpd_match_table[] = {
 275         { .compatible = "qcom,sc7180-rpmhpd", .data = &sc7180_desc },
 276         { .compatible = "qcom,sc7280-rpmhpd", .data = &sc7280_desc },
 277         { .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
 278         { .compatible = "qcom,sdx55-rpmhpd", .data = &sdx55_desc},
 279         { .compatible = "qcom,sm8150-rpmhpd", .data = &sm8150_desc },
 280         { .compatible = "qcom,sm8250-rpmhpd", .data = &sm8250_desc },
 281         { .compatible = "qcom,sm8350-rpmhpd", .data = &sm8350_desc },
 282         { }
 283 };
 284 MODULE_DEVICE_TABLE(of, rpmhpd_match_table);
 285
 286 static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
 287                               unsigned int corner, bool sync)
 288 {
 289         struct tcs_cmd cmd = {
 290                 .addr = pd->addr,
 291                 .data = corner,
 292         };
 293
 294         /*
 295          * Wait for an ack only when we are increasing the
 296          * perf state of the power domain
 297          */
 298         if (sync)
 299                 return rpmh_write(pd->dev, state, &cmd, 1);
 300         else
 301                 return rpmh_write_async(pd->dev, state, &cmd, 1);
 302 }
 303
 304 static void to_active_sleep(struct rpmhpd *pd, unsigned int corner,
 305                             unsigned int *active, unsigned int *sleep)
 306 {
 307         *active = corner;
 308
 309         if (pd->active_only)
 310                 *sleep = 0;
 311         else
 312                 *sleep = *active;
 313 }
 314
 315 /*
 316  * This function is used to aggregate the votes across the active only
 317  * resources and its peers. The aggregated votes are sent to RPMh as
 318  * ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
 319  * (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
 320  * on system sleep).
 321  * We send ACTIVE_ONLY votes for resources without any peers. For others,
 322  * which have an active only peer, all 3 votes are sent.
 323  */
 324 static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
 325 {
 326         int ret;
 327         struct rpmhpd *peer = pd->peer;
 328         unsigned int active_corner, sleep_corner;
 329         unsigned int this_active_corner = 0, this_sleep_corner = 0;
 330         unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
 331
 332         to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);
 333
 334         if (peer && peer->enabled)
 335                 to_active_sleep(peer, peer->corner, &peer_active_corner,
 336                                 &peer_sleep_corner);
 337
 338         active_corner = max(this_active_corner, peer_active_corner);
 339
 340         ret = rpmhpd_send_corner(pd, RPMH_ACTIVE_ONLY_STATE, active_corner,
 341                                  active_corner > pd->active_corner);
 342         if (ret)
 343                 return ret;
 344
 345         pd->active_corner = active_corner;
 346
 347         if (peer) {
 348                 peer->active_corner = active_corner;
 349
 350                 ret = rpmhpd_send_corner(pd, RPMH_WAKE_ONLY_STATE,
 351                                          active_corner, false);
 352                 if (ret)
 353                         return ret;
 354
 355                 sleep_corner = max(this_sleep_corner, peer_sleep_corner);
 356
 357                 return rpmhpd_send_corner(pd, RPMH_SLEEP_STATE, sleep_corner,
 358                                           false);
 359         }
 360
 361         return ret;
 362 }
 363
 364 static int rpmhpd_power_on(struct generic_pm_domain *domain)
 365 {
 366         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 367         int ret = 0;
 368
 369         mutex_lock(&rpmhpd_lock);
 370
 371         if (pd->corner)
 372                 ret = rpmhpd_aggregate_corner(pd, pd->corner);
 373
 374         if (!ret)
 375                 pd->enabled = true;
 376
 377         mutex_unlock(&rpmhpd_lock);
 378
 379         return ret;
 380 }
 381
 382 static int rpmhpd_power_off(struct generic_pm_domain *domain)
 383 {
 384         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 385         int ret = 0;
 386
 387         mutex_lock(&rpmhpd_lock);
 388
 389         ret = rpmhpd_aggregate_corner(pd, pd->level[0]);
 390
 391         if (!ret)
 392                 pd->enabled = false;
 393
 394         mutex_unlock(&rpmhpd_lock);
 395
 396         return ret;
 397 }
 398
 399 static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
 400                                         unsigned int level)
 401 {
 402         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 403         int ret = 0, i;
 404
 405         mutex_lock(&rpmhpd_lock);
 406
 407         for (i = 0; i < pd->level_count; i++)
 408                 if (level <= pd->level[i])
 409                         break;
 410
 411         /*
 412          * If the level requested is more than that supported by the
 413          * max corner, just set it to max anyway.
 414          */
 415         if (i == pd->level_count)
 416                 i--;
 417
 418         if (pd->enabled) {
 419                 ret = rpmhpd_aggregate_corner(pd, i);
 420                 if (ret)
 421                         goto out;
 422         }
 423
 424         pd->corner = i;
 425 out:
 426         mutex_unlock(&rpmhpd_lock);
 427
 428         return ret;
 429 }
 430
 431 static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
 432                                                  struct dev_pm_opp *opp)
 433 {
 434         return dev_pm_opp_get_level(opp);
 435 }
 436
 437 static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
 438 {
 439         int i;
 440         const u16 *buf;
 441
 442         buf = cmd_db_read_aux_data(rpmhpd->res_name, &rpmhpd->level_count);
 443         if (IS_ERR(buf))
 444                 return PTR_ERR(buf);
 445
 446         /* 2 bytes used for each command DB aux data entry */
 447         rpmhpd->level_count >>= 1;
 448
 449         if (rpmhpd->level_count > RPMH_ARC_MAX_LEVELS)
 450                 return -EINVAL;
 451
 452         for (i = 0; i < rpmhpd->level_count; i++) {
 453                 rpmhpd->level[i] = buf[i];
 454
 455                 /*
 456                  * The AUX data may be zero padded.  These 0 valued entries at
 457                  * the end of the map must be ignored.
 458                  */
 459                 if (i > 0 && rpmhpd->level[i] == 0) {
 460                         rpmhpd->level_count = i;
 461                         break;
 462                 }
 463                 pr_debug("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
 464                          rpmhpd->level[i]);
 465         }
 466
 467         return 0;
 468 }
 469
 470 static int rpmhpd_probe(struct platform_device *pdev)
 471 {
 472         int i, ret;
 473         size_t num_pds;
 474         struct device *dev = &pdev->dev;
 475         struct genpd_onecell_data *data;
 476         struct rpmhpd **rpmhpds;
 477         const struct rpmhpd_desc *desc;
 478
 479         desc = of_device_get_match_data(dev);
 480         if (!desc)
 481                 return -EINVAL;
 482
 483         rpmhpds = desc->rpmhpds;
 484         num_pds = desc->num_pds;
 485
 486         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 487         if (!data)
 488                 return -ENOMEM;
 489
 490         data->domains = devm_kcalloc(dev, num_pds, sizeof(*data->domains),
 491                                      GFP_KERNEL);
 492         if (!data->domains)
 493                 return -ENOMEM;
 494
 495         data->num_domains = num_pds;
 496
 497         for (i = 0; i < num_pds; i++) {
 498                 if (!rpmhpds[i]) {
 499                         dev_warn(dev, "rpmhpds[%d] is empty\n", i);
 500                         continue;
 501                 }
 502
 503                 rpmhpds[i]->dev = dev;
 504                 rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
 505                 if (!rpmhpds[i]->addr) {
 506                         dev_err(dev, "Could not find RPMh address for resource %s\n",
 507                                 rpmhpds[i]->res_name);
 508                         return -ENODEV;
 509                 }
 510
 511                 ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
 512                 if (ret != CMD_DB_HW_ARC) {
 513                         dev_err(dev, "RPMh slave ID mismatch\n");
 514                         return -EINVAL;
 515                 }
 516
 517                 ret = rpmhpd_update_level_mapping(rpmhpds[i]);
 518                 if (ret)
 519                         return ret;
 520
 521                 rpmhpds[i]->pd.power_off = rpmhpd_power_off;
 522                 rpmhpds[i]->pd.power_on = rpmhpd_power_on;
 523                 rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
 524                 rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
 525                 pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
 526
 527                 data->domains[i] = &rpmhpds[i]->pd;
 528         }
 529
 530         /* Add subdomains */
 531         for (i = 0; i < num_pds; i++) {
 532                 if (!rpmhpds[i])
 533                         continue;
 534                 if (rpmhpds[i]->parent)
 535                         pm_genpd_add_subdomain(rpmhpds[i]->parent,
 536                                                &rpmhpds[i]->pd);
 537         }
 538
 539         return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
 540 }
 541
 542 static struct platform_driver rpmhpd_driver = {
 543         .driver = {
 544                 .name = "qcom-rpmhpd",
 545                 .of_match_table = rpmhpd_match_table,
 546                 .suppress_bind_attrs = true,
 547         },
 548         .probe = rpmhpd_probe,
 549 };
 550
 551 static int __init rpmhpd_init(void)
 552 {
 553         return platform_driver_register(&rpmhpd_driver);
 554 }
 555 core_initcall(rpmhpd_init);
 556
 557 MODULE_DESCRIPTION("Qualcomm Technologies, Inc. RPMh Power Domain Driver");
 558 MODULE_LICENSE("GPL v2");