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         .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;
 239
 240         mutex_lock(&rpmhpd_lock);
 241
 242         ret = rpmhpd_aggregate_corner(pd, 0);
 243         if (!ret)
 244                 pd->enabled = false;
 245
 246         mutex_unlock(&rpmhpd_lock);
 247
 248         return ret;
 249 }
 250
 251 static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
 252                                         unsigned int level)
 253 {
 254         struct rpmhpd *pd = domain_to_rpmhpd(domain);
 255         int ret = 0, i;
 256
 257         mutex_lock(&rpmhpd_lock);
 258
 259         for (i = 0; i < pd->level_count; i++)
 260                 if (level <= pd->level[i])
 261                         break;
 262
 263         /*
 264          * If the level requested is more than that supported by the
 265          * max corner, just set it to max anyway.
 266          */
 267         if (i == pd->level_count)
 268                 i--;
 269
 270         if (pd->enabled) {
 271                 ret = rpmhpd_aggregate_corner(pd, i);
 272                 if (ret)
 273                         goto out;
 274         }
 275
 276         pd->corner = i;
 277 out:
 278         mutex_unlock(&rpmhpd_lock);
 279
 280         return ret;
 281 }
 282
 283 static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
 284                                                  struct dev_pm_opp *opp)
 285 {
 286         return dev_pm_opp_get_level(opp);
 287 }
 288
 289 static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
 290 {
 291         int i;
 292         const u16 *buf;
 293
 294         buf = cmd_db_read_aux_data(rpmhpd->res_name, &rpmhpd->level_count);
 295         if (IS_ERR(buf))
 296                 return PTR_ERR(buf);
 297
 298         /* 2 bytes used for each command DB aux data entry */
 299         rpmhpd->level_count >>= 1;
 300
 301         if (rpmhpd->level_count > RPMH_ARC_MAX_LEVELS)
 302                 return -EINVAL;
 303
 304         for (i = 0; i < rpmhpd->level_count; i++) {
 305                 rpmhpd->level[i] = buf[i];
 306
 307                 /*
 308                  * The AUX data may be zero padded.  These 0 valued entries at
 309                  * the end of the map must be ignored.
 310                  */
 311                 if (i > 0 && rpmhpd->level[i] == 0) {
 312                         rpmhpd->level_count = i;
 313                         break;
 314                 }
 315                 pr_debug("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
 316                          rpmhpd->level[i]);
 317         }
 318
 319         return 0;
 320 }
 321
 322 static int rpmhpd_probe(struct platform_device *pdev)
 323 {
 324         int i, ret;
 325         size_t num_pds;
 326         struct device *dev = &pdev->dev;
 327         struct genpd_onecell_data *data;
 328         struct rpmhpd **rpmhpds;
 329         const struct rpmhpd_desc *desc;
 330
 331         desc = of_device_get_match_data(dev);
 332         if (!desc)
 333                 return -EINVAL;
 334
 335         rpmhpds = desc->rpmhpds;
 336         num_pds = desc->num_pds;
 337
 338         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 339         if (!data)
 340                 return -ENOMEM;
 341
 342         data->domains = devm_kcalloc(dev, num_pds, sizeof(*data->domains),
 343                                      GFP_KERNEL);
 344         if (!data->domains)
 345                 return -ENOMEM;
 346
 347         data->num_domains = num_pds;
 348
 349         for (i = 0; i < num_pds; i++) {
 350                 if (!rpmhpds[i]) {
 351                         dev_warn(dev, "rpmhpds[%d] is empty\n", i);
 352                         continue;
 353                 }
 354
 355                 rpmhpds[i]->dev = dev;
 356                 rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
 357                 if (!rpmhpds[i]->addr) {
 358                         dev_err(dev, "Could not find RPMh address for resource %s\n",
 359                                 rpmhpds[i]->res_name);
 360                         return -ENODEV;
 361                 }
 362
 363                 ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
 364                 if (ret != CMD_DB_HW_ARC) {
 365                         dev_err(dev, "RPMh slave ID mismatch\n");
 366                         return -EINVAL;
 367                 }
 368
 369                 ret = rpmhpd_update_level_mapping(rpmhpds[i]);
 370                 if (ret)
 371                         return ret;
 372
 373                 rpmhpds[i]->pd.power_off = rpmhpd_power_off;
 374                 rpmhpds[i]->pd.power_on = rpmhpd_power_on;
 375                 rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
 376                 rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
 377                 pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
 378
 379                 data->domains[i] = &rpmhpds[i]->pd;
 380         }
 381
 382         /* Add subdomains */
 383         for (i = 0; i < num_pds; i++) {
 384                 if (!rpmhpds[i])
 385                         continue;
 386                 if (rpmhpds[i]->parent)
 387                         pm_genpd_add_subdomain(rpmhpds[i]->parent,
 388                                                &rpmhpds[i]->pd);
 389         }
 390
 391         return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
 392 }
 393
 394 static struct platform_driver rpmhpd_driver = {
 395         .driver = {
 396                 .name = "qcom-rpmhpd",
 397                 .of_match_table = rpmhpd_match_table,
 398                 .suppress_bind_attrs = true,
 399         },
 400         .probe = rpmhpd_probe,
 401 };
 402
 403 static int __init rpmhpd_init(void)
 404 {
 405         return platform_driver_register(&rpmhpd_driver);
 406 }
 407 core_initcall(rpmhpd_init);