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/mutex.h>
   8 #include <linux/pm_domain.h>
   9 #include <linux/slab.h>
  10 #include <linux/of.h>
  11 #include <linux/of_device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/pm_opp.h>
  14 #include <soc/qcom/cmd-db.h>
  15 #include <soc/qcom/rpmh.h>
  16 #include <dt-bindings/power/qcom-rpmpd.h>
  17
  18 #define domain_to_rpmhpd(domain) container_of(domain, struct rpmhpd, pd)
  19
  20 #define RPMH_ARC_MAX_LEVELS     16
  21
  22 /**
  23  * struct rpmhpd - top level RPMh power domain resource data structure
  24  * @dev:                rpmh power domain controller device
  25  * @pd:                 generic_pm_domain corrresponding to the power domain
  26  * @peer:               A peer power domain in case Active only Voting is
  27  *                      supported
  28  * @active_only:        True if it represents an Active only peer
  29  * @level:              An array of level (vlvl) to corner (hlvl) mappings
  30  *                      derived from cmd-db
  31  * @level_count:        Number of levels supported by the power domain. max
  32  *                      being 16 (0 - 15)
  33  * @enabled:            true if the power domain is enabled
  34  * @res_name:           Resource name used for cmd-db lookup
  35  * @addr:               Resource address as looped up using resource name from
  36  *                      cmd-db
  37  */
  38 struct rpmhpd {
  39         struct device   *dev;
  40         struct generic_pm_domain pd;
  41         struct generic_pm_domain *parent;
  42         struct rpmhpd   *peer;
  43         const bool      active_only;
  44         unsigned int    corner;
  45         unsigned int    active_corner;
  46         u32             level[RPMH_ARC_MAX_LEVELS];
  47         size_t          level_count;
  48         bool            enabled;
  49         const char      *res_name;
  50         u32             addr;
  51 };
  52
  53 struct rpmhpd_desc {
  54         struct rpmhpd **rpmhpds;
  55         size_t num_pds;
  56 };
  57
  58 static DEFINE_MUTEX(rpmhpd_lock);
  59
  60 /* SDM845 RPMH powerdomains */
  61
  62 static struct rpmhpd sdm845_ebi = {
  63         .pd = { .name = "ebi", },
  64         .res_name = "ebi.lvl",
  65 };
  66
  67 static struct rpmhpd sdm845_lmx = {
  68         .pd = { .name = "lmx", },
  69         .res_name = "lmx.lvl",
  70 };
  71
  72 static struct rpmhpd sdm845_lcx = {
  73         .pd = { .name = "lcx", },
  74         .res_name = "lcx.lvl",
  75 };
  76
  77 static struct rpmhpd sdm845_gfx = {
  78         .pd = { .name = "gfx", },
  79         .res_name = "gfx.lvl",
  80 };
  81
  82 static struct rpmhpd sdm845_mss = {
  83         .pd = { .name = "mss", },
  84         .res_name = "mss.lvl",
  85 };
  86
  87 static struct rpmhpd sdm845_mx_ao;
  88 static struct rpmhpd sdm845_mx = {
  89         .pd = { .name = "mx", },
  90         .peer = &sdm845_mx_ao,
  91         .res_name = "mx.lvl",
  92 };
  93
  94 static struct rpmhpd sdm845_mx_ao = {
  95         .pd = { .name = "mx_ao", },
  96         .peer = &sdm845_mx,
  97         .res_name = "mx.lvl",
  98 };
  99
 100 static struct rpmhpd sdm845_cx_ao;
 101 static struct rpmhpd sdm845_cx = {
 102         .pd = { .name = "cx", },
 103         .peer = &sdm845_cx_ao,
 104         .parent = &sdm845_mx.pd,
 105         .res_name = "cx.lvl",
 106 };
 107
 108 static struct rpmhpd sdm845_cx_ao = {
 109         .pd = { .name = "cx_ao", },
 110         .peer = &sdm845_cx,
 111         .parent = &sdm845_mx_ao.pd,
 112         .res_name = "cx.lvl",
 113 };
 114
 115 static struct rpmhpd *sdm845_rpmhpds[] = {
 116         [SDM845_EBI] = &sdm845_ebi,
 117         [SDM845_MX] = &sdm845_mx,
 118         [SDM845_MX_AO] = &sdm845_mx_ao,
 119         [SDM845_CX] = &sdm845_cx,
 120         [SDM845_CX_AO] = &sdm845_cx_ao,
 121         [SDM845_LMX] = &sdm845_lmx,
 122         [SDM845_LCX] = &sdm845_lcx,
 123         [SDM845_GFX] = &sdm845_gfx,
 124         [SDM845_MSS] = &sdm845_mss,
 125 };
 126
 127 static const struct rpmhpd_desc sdm845_desc = {
 128         .rpmhpds = sdm845_rpmhpds,
 129         .num_pds = ARRAY_SIZE(sdm845_rpmhpds),
 130 };
 131
 132 static const struct of_device_id rpmhpd_match_table[] = {
 133         { .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
 134         { }
 135 };
 136
 137 static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
 138                               unsigned int corner, bool sync)
 139 {
 140         struct tcs_cmd cmd = {
 141                 .addr = pd->addr,
 142                 .data = corner,
 143         };
 144
 145         /*
 146          * Wait for an ack only when we are increasing the
 147          * perf state of the power domain
 148          */
 149         if (sync)
 150                 return rpmh_write(pd->dev, state, &cmd, 1);
 151         else
 152                 return rpmh_write_async(pd->dev, state, &cmd, 1);
 153 }
 154
 155 static void to_active_sleep(struct rpmhpd *pd, unsigned int corner,
 156                             unsigned int *active, unsigned int *sleep)
 157 {
 158         *active = corner;
 159
 160         if (pd->active_only)
 161                 *sleep = 0;
 162         else
 163                 *sleep = *active;
 164 }
 165
 166 /*
 167  * This function is used to aggregate the votes across the active only
 168  * resources and its peers. The aggregated votes are sent to RPMh as
 169  * ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
 170  * (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
 171  * on system sleep).
 172  * We send ACTIVE_ONLY votes for resources without any peers. For others,
 173  * which have an active only peer, all 3 votes are sent.
 174  */
 175 static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
 176 {
 177         int ret;
 178         struct rpmhpd *peer = pd->peer;
 179         unsigned int active_corner, sleep_corner;
 180         unsigned int this_active_corner = 0, this_sleep_corner = 0;
 181         unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
 182
 183         to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);
 184
 185         if (peer && peer->enabled)
 186                 to_active_sleep(peer, peer->corner, &peer_active_corner,
 187                                 &peer_sleep_corner);
 188
 189         active_corner = max(this_active_corner, peer_active_corner);
 190
 191         ret = rpmhpd_send_corner(pd, RPMH_ACTIVE_ONLY_STATE, active_corner,
 192                                  active_corner > pd->active_corner);
 193         if (ret)
 194                 return ret;
 195
 196         pd->active_corner = active_corner;
 197
 198         if (peer) {
 199                 peer->active_corner = active_corner;
 200
 201                 ret = rpmhpd_send_corner(pd, RPMH_WAKE_ONLY_STATE,
 202                                          active_corner, false);
 203                 if (ret)
 204                         return ret;
 205
 206                 sleep_corner = max(this_sleep_corner, peer_sleep_corner);
 207
 208                 return rpmhpd_send_corner(pd, RPMH_SLEEP_STATE, sleep_corner,
 209                                           false);
 210         }
 211
 212         return ret;
 213 }
 214
 215 static int rpmhpd_power_on(struct generic_pm_domain *domain)
 216 {
 217         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 218         int ret = 0;
 219
 220         mutex_lock(&rpmhpd_lock);
 221
 222         if (pd->corner)
 223                 ret = rpmhpd_aggregate_corner(pd, pd->corner);
 224
 225         if (!ret)
 226                 pd->enabled = true;
 227
 228         mutex_unlock(&rpmhpd_lock);
 229
 230         return ret;
 231 }
 232
 233 static int rpmhpd_power_off(struct generic_pm_domain *domain)
 234 {
 235         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 236         int ret = 0;
 237
 238         mutex_lock(&rpmhpd_lock);
 239
 240         ret = rpmhpd_aggregate_corner(pd, pd->level[0]);
 241
 242         if (!ret)
 243                 pd->enabled = false;
 244
 245         mutex_unlock(&rpmhpd_lock);
 246
 247         return ret;
 248 }
 249
 250 static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
 251                                         unsigned int level)
 252 {
 253         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 254         int ret = 0, i;
 255
 256         mutex_lock(&rpmhpd_lock);
 257
 258         for (i = 0; i < pd->level_count; i++)
 259                 if (level <= pd->level[i])
 260                         break;
 261
 262         /*
 263          * If the level requested is more than that supported by the
 264          * max corner, just set it to max anyway.
 265          */
 266         if (i == pd->level_count)
 267                 i--;
 268
 269         if (pd->enabled) {
 270                 ret = rpmhpd_aggregate_corner(pd, i);
 271                 if (ret)
 272                         goto out;
 273         }
 274
 275         pd->corner = i;
 276 out:
 277         mutex_unlock(&rpmhpd_lock);
 278
 279         return ret;
 280 }
 281
 282 static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
 283                                                  struct dev_pm_opp *opp)
 284 {
 285         return dev_pm_opp_get_level(opp);
 286 }
 287
 288 static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
 289 {
 290         int i;
 291         const u16 *buf;
 292
 293         buf = cmd_db_read_aux_data(rpmhpd->res_name, &rpmhpd->level_count);
 294         if (IS_ERR(buf))
 295                 return PTR_ERR(buf);
 296
 297         /* 2 bytes used for each command DB aux data entry */
 298         rpmhpd->level_count >>= 1;
 299
 300         if (rpmhpd->level_count > RPMH_ARC_MAX_LEVELS)
 301                 return -EINVAL;
 302
 303         for (i = 0; i < rpmhpd->level_count; i++) {
 304                 rpmhpd->level[i] = buf[i];
 305
 306                 /*
 307                  * The AUX data may be zero padded.  These 0 valued entries at
 308                  * the end of the map must be ignored.
 309                  */
 310                 if (i > 0 && rpmhpd->level[i] == 0) {
 311                         rpmhpd->level_count = i;
 312                         break;
 313                 }
 314                 pr_debug("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
 315                          rpmhpd->level[i]);
 316         }
 317
 318         return 0;
 319 }
 320
 321 static int rpmhpd_probe(struct platform_device *pdev)
 322 {
 323         int i, ret;
 324         size_t num_pds;
 325         struct device *dev = &pdev->dev;
 326         struct genpd_onecell_data *data;
 327         struct rpmhpd **rpmhpds;
 328         const struct rpmhpd_desc *desc;
 329
 330         desc = of_device_get_match_data(dev);
 331         if (!desc)
 332                 return -EINVAL;
 333
 334         rpmhpds = desc->rpmhpds;
 335         num_pds = desc->num_pds;
 336
 337         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 338         if (!data)
 339                 return -ENOMEM;
 340
 341         data->domains = devm_kcalloc(dev, num_pds, sizeof(*data->domains),
 342                                      GFP_KERNEL);
 343         if (!data->domains)
 344                 return -ENOMEM;
 345
 346         data->num_domains = num_pds;
 347
 348         for (i = 0; i < num_pds; i++) {
 349                 if (!rpmhpds[i]) {
 350                         dev_warn(dev, "rpmhpds[%d] is empty\n", i);
 351                         continue;
 352                 }
 353
 354                 rpmhpds[i]->dev = dev;
 355                 rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
 356                 if (!rpmhpds[i]->addr) {
 357                         dev_err(dev, "Could not find RPMh address for resource %s\n",
 358                                 rpmhpds[i]->res_name);
 359                         return -ENODEV;
 360                 }
 361
 362                 ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
 363                 if (ret != CMD_DB_HW_ARC) {
 364                         dev_err(dev, "RPMh slave ID mismatch\n");
 365                         return -EINVAL;
 366                 }
 367
 368                 ret = rpmhpd_update_level_mapping(rpmhpds[i]);
 369                 if (ret)
 370                         return ret;
 371
 372                 rpmhpds[i]->pd.power_off = rpmhpd_power_off;
 373                 rpmhpds[i]->pd.power_on = rpmhpd_power_on;
 374                 rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
 375                 rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
 376                 pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
 377
 378                 data->domains[i] = &rpmhpds[i]->pd;
 379         }
 380
 381         /* Add subdomains */
 382         for (i = 0; i < num_pds; i++) {
 383                 if (!rpmhpds[i])
 384                         continue;
 385                 if (rpmhpds[i]->parent)
 386                         pm_genpd_add_subdomain(rpmhpds[i]->parent,
 387                                                &rpmhpds[i]->pd);
 388         }
 389
 390         return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
 391 }
 392
 393 static struct platform_driver rpmhpd_driver = {
 394         .driver = {
 395                 .name = "qcom-rpmhpd",
 396                 .of_match_table = rpmhpd_match_table,
 397                 .suppress_bind_attrs = true,
 398         },
 399         .probe = rpmhpd_probe,
 400 };
 401
 402 static int __init rpmhpd_init(void)
 403 {
 404         return platform_driver_register(&rpmhpd_driver);
 405 }
 406 core_initcall(rpmhpd_init);