root/drivers/soc/qcom/rpmhpd.c

DEFINITIONS

1. rpmhpd_send_corner
2. to_active_sleep
3. rpmhpd_aggregate_corner
4. rpmhpd_power_on
5. rpmhpd_power_off
6. rpmhpd_set_performance_state
7. rpmhpd_get_performance_state
8. rpmhpd_update_level_mapping
9. rpmhpd_probe
10. rpmhpd_init

   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         .active_only = true,
  97         .peer = &sdm845_mx,
  98         .res_name = "mx.lvl",
  99 };
 100 
 101 static struct rpmhpd sdm845_cx_ao;
 102 static struct rpmhpd sdm845_cx = {
 103         .pd = { .name = "cx", },
 104         .peer = &sdm845_cx_ao,
 105         .parent = &sdm845_mx.pd,
 106         .res_name = "cx.lvl",
 107 };
 108 
 109 static struct rpmhpd sdm845_cx_ao = {
 110         .pd = { .name = "cx_ao", },
 111         .active_only = true,
 112         .peer = &sdm845_cx,
 113         .parent = &sdm845_mx_ao.pd,
 114         .res_name = "cx.lvl",
 115 };
 116 
 117 static struct rpmhpd *sdm845_rpmhpds[] = {
 118         [SDM845_EBI] = &sdm845_ebi,
 119         [SDM845_MX] = &sdm845_mx,
 120         [SDM845_MX_AO] = &sdm845_mx_ao,
 121         [SDM845_CX] = &sdm845_cx,
 122         [SDM845_CX_AO] = &sdm845_cx_ao,
 123         [SDM845_LMX] = &sdm845_lmx,
 124         [SDM845_LCX] = &sdm845_lcx,
 125         [SDM845_GFX] = &sdm845_gfx,
 126         [SDM845_MSS] = &sdm845_mss,
 127 };
 128 
 129 static const struct rpmhpd_desc sdm845_desc = {
 130         .rpmhpds = sdm845_rpmhpds,
 131         .num_pds = ARRAY_SIZE(sdm845_rpmhpds),
 132 };
 133 
 134 static const struct of_device_id rpmhpd_match_table[] = {
 135         { .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
 136         { }
 137 };
 138 
 139 static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
 140                               unsigned int corner, bool sync)
 141 {
 142         struct tcs_cmd cmd = {
 143                 .addr = pd->addr,
 144                 .data = corner,
 145         };
 146 
 147         /*
 148          * Wait for an ack only when we are increasing the
 149          * perf state of the power domain
 150          */
 151         if (sync)
 152                 return rpmh_write(pd->dev, state, &cmd, 1);
 153         else
 154                 return rpmh_write_async(pd->dev, state, &cmd, 1);
 155 }
 156 
 157 static void to_active_sleep(struct rpmhpd *pd, unsigned int corner,
 158                             unsigned int *active, unsigned int *sleep)
 159 {
 160         *active = corner;
 161 
 162         if (pd->active_only)
 163                 *sleep = 0;
 164         else
 165                 *sleep = *active;
 166 }
 167 
 168 /*
 169  * This function is used to aggregate the votes across the active only
 170  * resources and its peers. The aggregated votes are sent to RPMh as
 171  * ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
 172  * (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
 173  * on system sleep).
 174  * We send ACTIVE_ONLY votes for resources without any peers. For others,
 175  * which have an active only peer, all 3 votes are sent.
 176  */
 177 static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
 178 {
 179         int ret;
 180         struct rpmhpd *peer = pd->peer;
 181         unsigned int active_corner, sleep_corner;
 182         unsigned int this_active_corner = 0, this_sleep_corner = 0;
 183         unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
 184 
 185         to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);
 186 
 187         if (peer && peer->enabled)
 188                 to_active_sleep(peer, peer->corner, &peer_active_corner,
 189                                 &peer_sleep_corner);
 190 
 191         active_corner = max(this_active_corner, peer_active_corner);
 192 
 193         ret = rpmhpd_send_corner(pd, RPMH_ACTIVE_ONLY_STATE, active_corner,
 194                                  active_corner > pd->active_corner);
 195         if (ret)
 196                 return ret;
 197 
 198         pd->active_corner = active_corner;
 199 
 200         if (peer) {
 201                 peer->active_corner = active_corner;
 202 
 203                 ret = rpmhpd_send_corner(pd, RPMH_WAKE_ONLY_STATE,
 204                                          active_corner, false);
 205                 if (ret)
 206                         return ret;
 207 
 208                 sleep_corner = max(this_sleep_corner, peer_sleep_corner);
 209 
 210                 return rpmhpd_send_corner(pd, RPMH_SLEEP_STATE, sleep_corner,
 211                                           false);
 212         }
 213 
 214         return ret;
 215 }
 216 
 217 static int rpmhpd_power_on(struct generic_pm_domain *domain)
 218 {
 219         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 220         int ret = 0;
 221 
 222         mutex_lock(&rpmhpd_lock);
 223 
 224         if (pd->corner)
 225                 ret = rpmhpd_aggregate_corner(pd, pd->corner);
 226 
 227         if (!ret)
 228                 pd->enabled = true;
 229 
 230         mutex_unlock(&rpmhpd_lock);
 231 
 232         return ret;
 233 }
 234 
 235 static int rpmhpd_power_off(struct generic_pm_domain *domain)
 236 {
 237         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 238         int ret = 0;
 239 
 240         mutex_lock(&rpmhpd_lock);
 241 
 242         ret = rpmhpd_aggregate_corner(pd, pd->level[0]);
 243 
 244         if (!ret)
 245                 pd->enabled = false;
 246 
 247         mutex_unlock(&rpmhpd_lock);
 248 
 249         return ret;
 250 }
 251 
 252 static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
 253                                         unsigned int level)
 254 {
 255         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 256         int ret = 0, i;
 257 
 258         mutex_lock(&rpmhpd_lock);
 259 
 260         for (i = 0; i < pd->level_count; i++)
 261                 if (level <= pd->level[i])
 262                         break;
 263 
 264         /*
 265          * If the level requested is more than that supported by the
 266          * max corner, just set it to max anyway.
 267          */
 268         if (i == pd->level_count)
 269                 i--;
 270 
 271         if (pd->enabled) {
 272                 ret = rpmhpd_aggregate_corner(pd, i);
 273                 if (ret)
 274                         goto out;
 275         }
 276 
 277         pd->corner = i;
 278 out:
 279         mutex_unlock(&rpmhpd_lock);
 280 
 281         return ret;
 282 }
 283 
 284 static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
 285                                                  struct dev_pm_opp *opp)
 286 {
 287         return dev_pm_opp_get_level(opp);
 288 }
 289 
 290 static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
 291 {
 292         int i;
 293         const u16 *buf;
 294 
 295         buf = cmd_db_read_aux_data(rpmhpd->res_name, &rpmhpd->level_count);
 296         if (IS_ERR(buf))
 297                 return PTR_ERR(buf);
 298 
 299         /* 2 bytes used for each command DB aux data entry */
 300         rpmhpd->level_count >>= 1;
 301 
 302         if (rpmhpd->level_count > RPMH_ARC_MAX_LEVELS)
 303                 return -EINVAL;
 304 
 305         for (i = 0; i < rpmhpd->level_count; i++) {
 306                 rpmhpd->level[i] = buf[i];
 307 
 308                 /*
 309                  * The AUX data may be zero padded.  These 0 valued entries at
 310                  * the end of the map must be ignored.
 311                  */
 312                 if (i > 0 && rpmhpd->level[i] == 0) {
 313                         rpmhpd->level_count = i;
 314                         break;
 315                 }
 316                 pr_debug("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
 317                          rpmhpd->level[i]);
 318         }
 319 
 320         return 0;
 321 }
 322 
 323 static int rpmhpd_probe(struct platform_device *pdev)
 324 {
 325         int i, ret;
 326         size_t num_pds;
 327         struct device *dev = &pdev->dev;
 328         struct genpd_onecell_data *data;
 329         struct rpmhpd **rpmhpds;
 330         const struct rpmhpd_desc *desc;
 331 
 332         desc = of_device_get_match_data(dev);
 333         if (!desc)
 334                 return -EINVAL;
 335 
 336         rpmhpds = desc->rpmhpds;
 337         num_pds = desc->num_pds;
 338 
 339         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 340         if (!data)
 341                 return -ENOMEM;
 342 
 343         data->domains = devm_kcalloc(dev, num_pds, sizeof(*data->domains),
 344                                      GFP_KERNEL);
 345         if (!data->domains)
 346                 return -ENOMEM;
 347 
 348         data->num_domains = num_pds;
 349 
 350         for (i = 0; i < num_pds; i++) {
 351                 if (!rpmhpds[i]) {
 352                         dev_warn(dev, "rpmhpds[%d] is empty\n", i);
 353                         continue;
 354                 }
 355 
 356                 rpmhpds[i]->dev = dev;
 357                 rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
 358                 if (!rpmhpds[i]->addr) {
 359                         dev_err(dev, "Could not find RPMh address for resource %s\n",
 360                                 rpmhpds[i]->res_name);
 361                         return -ENODEV;
 362                 }
 363 
 364                 ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
 365                 if (ret != CMD_DB_HW_ARC) {
 366                         dev_err(dev, "RPMh slave ID mismatch\n");
 367                         return -EINVAL;
 368                 }
 369 
 370                 ret = rpmhpd_update_level_mapping(rpmhpds[i]);
 371                 if (ret)
 372                         return ret;
 373 
 374                 rpmhpds[i]->pd.power_off = rpmhpd_power_off;
 375                 rpmhpds[i]->pd.power_on = rpmhpd_power_on;
 376                 rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
 377                 rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
 378                 pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
 379 
 380                 data->domains[i] = &rpmhpds[i]->pd;
 381         }
 382 
 383         /* Add subdomains */
 384         for (i = 0; i < num_pds; i++) {
 385                 if (!rpmhpds[i])
 386                         continue;
 387                 if (rpmhpds[i]->parent)
 388                         pm_genpd_add_subdomain(rpmhpds[i]->parent,
 389                                                &rpmhpds[i]->pd);
 390         }
 391 
 392         return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
 393 }
 394 
 395 static struct platform_driver rpmhpd_driver = {
 396         .driver = {
 397                 .name = "qcom-rpmhpd",
 398                 .of_match_table = rpmhpd_match_table,
 399                 .suppress_bind_attrs = true,
 400         },
 401         .probe = rpmhpd_probe,
 402 };
 403 
 404 static int __init rpmhpd_init(void)
 405 {
 406         return platform_driver_register(&rpmhpd_driver);
 407 }
 408 core_initcall(rpmhpd_init);