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