drivers/soc/qcom/rpmpd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2017-2018, 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/of.h>
  10 #include <linux/of_device.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_opp.h>
  13 #include <linux/soc/qcom/smd-rpm.h>
  14
  15 #include <dt-bindings/power/qcom-rpmpd.h>
  16
  17 #define domain_to_rpmpd(domain) container_of(domain, struct rpmpd, pd)
  18
  19 /* Resource types:
  20  * RPMPD_X is X encoded as a little-endian, lower-case, ASCII string */
  21 #define RPMPD_SMPA 0x61706d73
  22 #define RPMPD_LDOA 0x616f646c
  23 #define RPMPD_RWCX 0x78637772
  24 #define RPMPD_RWMX 0x786d7772
  25 #define RPMPD_RWLC 0x636c7772
  26 #define RPMPD_RWLM 0x6d6c7772
  27 #define RPMPD_RWSC 0x63737772
  28 #define RPMPD_RWSM 0x6d737772
  29
  30 /* Operation Keys */
  31 #define KEY_CORNER              0x6e726f63 /* corn */
  32 #define KEY_ENABLE              0x6e657773 /* swen */
  33 #define KEY_FLOOR_CORNER        0x636676   /* vfc */
  34 #define KEY_FLOOR_LEVEL         0x6c6676   /* vfl */
  35 #define KEY_LEVEL               0x6c766c76 /* vlvl */
  36
  37 #define MAX_8996_RPMPD_STATE    6
  38
  39 #define DEFINE_RPMPD_PAIR(_platform, _name, _active, r_type, r_key,     \
  40                           r_id)                                         \
  41         static struct rpmpd _platform##_##_active;                      \
  42         static struct rpmpd _platform##_##_name = {                     \
  43                 .pd = { .name = #_name, },                              \
  44                 .peer = &_platform##_##_active,                         \
  45                 .res_type = RPMPD_##r_type,                             \
  46                 .res_id = r_id,                                         \
  47                 .key = KEY_##r_key,                                     \
  48         };                                                              \
  49         static struct rpmpd _platform##_##_active = {                   \
  50                 .pd = { .name = #_active, },                            \
  51                 .peer = &_platform##_##_name,                           \
  52                 .active_only = true,                                    \
  53                 .res_type = RPMPD_##r_type,                             \
  54                 .res_id = r_id,                                         \
  55                 .key = KEY_##r_key,                                     \
  56         }
  57
  58 #define DEFINE_RPMPD_CORNER(_platform, _name, r_type, r_id)             \
  59         static struct rpmpd _platform##_##_name = {                     \
  60                 .pd = { .name = #_name, },                              \
  61                 .res_type = RPMPD_##r_type,                             \
  62                 .res_id = r_id,                                         \
  63                 .key = KEY_CORNER,                                      \
  64         }
  65
  66 #define DEFINE_RPMPD_LEVEL(_platform, _name, r_type, r_id)              \
  67         static struct rpmpd _platform##_##_name = {                     \
  68                 .pd = { .name = #_name, },                              \
  69                 .res_type = RPMPD_##r_type,                             \
  70                 .res_id = r_id,                                         \
  71                 .key = KEY_LEVEL,                                       \
  72         }
  73
  74 #define DEFINE_RPMPD_VFC(_platform, _name, r_type, r_id)                \
  75         static struct rpmpd _platform##_##_name = {                     \
  76                 .pd = { .name = #_name, },                              \
  77                 .res_type = RPMPD_##r_type,                             \
  78                 .res_id = r_id,                                         \
  79                 .key = KEY_FLOOR_CORNER,                                \
  80         }
  81
  82 #define DEFINE_RPMPD_VFL(_platform, _name, r_type, r_id)                \
  83         static struct rpmpd _platform##_##_name = {                     \
  84                 .pd = { .name = #_name, },                              \
  85                 .res_type = RPMPD_##r_type,                             \
  86                 .res_id = r_id,                                         \
  87                 .key = KEY_FLOOR_LEVEL,                                 \
  88         }
  89
  90 struct rpmpd_req {
  91         __le32 key;
  92         __le32 nbytes;
  93         __le32 value;
  94 };
  95
  96 struct rpmpd {
  97         struct generic_pm_domain pd;
  98         struct rpmpd *peer;
  99         const bool active_only;
 100         unsigned int corner;
 101         bool enabled;
 102         const char *res_name;
 103         const int res_type;
 104         const int res_id;
 105         struct qcom_smd_rpm *rpm;
 106         unsigned int max_state;
 107         __le32 key;
 108 };
 109
 110 struct rpmpd_desc {
 111         struct rpmpd **rpmpds;
 112         size_t num_pds;
 113         unsigned int max_state;
 114 };
 115
 116 static DEFINE_MUTEX(rpmpd_lock);
 117
 118 /* msm8976 RPM Power Domains */
 119 DEFINE_RPMPD_PAIR(msm8976, vddcx, vddcx_ao, SMPA, LEVEL, 2);
 120 DEFINE_RPMPD_PAIR(msm8976, vddmx, vddmx_ao, SMPA, LEVEL, 6);
 121
 122 DEFINE_RPMPD_VFL(msm8976, vddcx_vfl, RWSC, 2);
 123 DEFINE_RPMPD_VFL(msm8976, vddmx_vfl, RWSM, 6);
 124
 125 static struct rpmpd *msm8976_rpmpds[] = {
 126         [MSM8976_VDDCX] =       &msm8976_vddcx,
 127         [MSM8976_VDDCX_AO] =    &msm8976_vddcx_ao,
 128         [MSM8976_VDDCX_VFL] =   &msm8976_vddcx_vfl,
 129         [MSM8976_VDDMX] =       &msm8976_vddmx,
 130         [MSM8976_VDDMX_AO] =    &msm8976_vddmx_ao,
 131         [MSM8976_VDDMX_VFL] =   &msm8976_vddmx_vfl,
 132 };
 133
 134 static const struct rpmpd_desc msm8976_desc = {
 135         .rpmpds = msm8976_rpmpds,
 136         .num_pds = ARRAY_SIZE(msm8976_rpmpds),
 137         .max_state = RPM_SMD_LEVEL_TURBO_HIGH,
 138 };
 139
 140 /* msm8996 RPM Power domains */
 141 DEFINE_RPMPD_PAIR(msm8996, vddcx, vddcx_ao, SMPA, CORNER, 1);
 142 DEFINE_RPMPD_PAIR(msm8996, vddmx, vddmx_ao, SMPA, CORNER, 2);
 143 DEFINE_RPMPD_CORNER(msm8996, vddsscx, LDOA, 26);
 144
 145 DEFINE_RPMPD_VFC(msm8996, vddcx_vfc, SMPA, 1);
 146 DEFINE_RPMPD_VFC(msm8996, vddsscx_vfc, LDOA, 26);
 147
 148 static struct rpmpd *msm8996_rpmpds[] = {
 149         [MSM8996_VDDCX] =       &msm8996_vddcx,
 150         [MSM8996_VDDCX_AO] =    &msm8996_vddcx_ao,
 151         [MSM8996_VDDCX_VFC] =   &msm8996_vddcx_vfc,
 152         [MSM8996_VDDMX] =       &msm8996_vddmx,
 153         [MSM8996_VDDMX_AO] =    &msm8996_vddmx_ao,
 154         [MSM8996_VDDSSCX] =     &msm8996_vddsscx,
 155         [MSM8996_VDDSSCX_VFC] = &msm8996_vddsscx_vfc,
 156 };
 157
 158 static const struct rpmpd_desc msm8996_desc = {
 159         .rpmpds = msm8996_rpmpds,
 160         .num_pds = ARRAY_SIZE(msm8996_rpmpds),
 161         .max_state = MAX_8996_RPMPD_STATE,
 162 };
 163
 164 /* msm8998 RPM Power domains */
 165 DEFINE_RPMPD_PAIR(msm8998, vddcx, vddcx_ao, RWCX, LEVEL, 0);
 166 DEFINE_RPMPD_VFL(msm8998, vddcx_vfl, RWCX, 0);
 167
 168 DEFINE_RPMPD_PAIR(msm8998, vddmx, vddmx_ao, RWMX, LEVEL, 0);
 169 DEFINE_RPMPD_VFL(msm8998, vddmx_vfl, RWMX, 0);
 170
 171 DEFINE_RPMPD_LEVEL(msm8998, vdd_ssccx, RWSC, 0);
 172 DEFINE_RPMPD_VFL(msm8998, vdd_ssccx_vfl, RWSC, 0);
 173
 174 DEFINE_RPMPD_LEVEL(msm8998, vdd_sscmx, RWSM, 0);
 175 DEFINE_RPMPD_VFL(msm8998, vdd_sscmx_vfl, RWSM, 0);
 176
 177 static struct rpmpd *msm8998_rpmpds[] = {
 178         [MSM8998_VDDCX] =               &msm8998_vddcx,
 179         [MSM8998_VDDCX_AO] =            &msm8998_vddcx_ao,
 180         [MSM8998_VDDCX_VFL] =           &msm8998_vddcx_vfl,
 181         [MSM8998_VDDMX] =               &msm8998_vddmx,
 182         [MSM8998_VDDMX_AO] =            &msm8998_vddmx_ao,
 183         [MSM8998_VDDMX_VFL] =           &msm8998_vddmx_vfl,
 184         [MSM8998_SSCCX] =               &msm8998_vdd_ssccx,
 185         [MSM8998_SSCCX_VFL] =           &msm8998_vdd_ssccx_vfl,
 186         [MSM8998_SSCMX] =               &msm8998_vdd_sscmx,
 187         [MSM8998_SSCMX_VFL] =           &msm8998_vdd_sscmx_vfl,
 188 };
 189
 190 static const struct rpmpd_desc msm8998_desc = {
 191         .rpmpds = msm8998_rpmpds,
 192         .num_pds = ARRAY_SIZE(msm8998_rpmpds),
 193         .max_state = RPM_SMD_LEVEL_BINNING,
 194 };
 195
 196 /* qcs404 RPM Power domains */
 197 DEFINE_RPMPD_PAIR(qcs404, vddmx, vddmx_ao, RWMX, LEVEL, 0);
 198 DEFINE_RPMPD_VFL(qcs404, vddmx_vfl, RWMX, 0);
 199
 200 DEFINE_RPMPD_LEVEL(qcs404, vdd_lpicx, RWLC, 0);
 201 DEFINE_RPMPD_VFL(qcs404, vdd_lpicx_vfl, RWLC, 0);
 202
 203 DEFINE_RPMPD_LEVEL(qcs404, vdd_lpimx, RWLM, 0);
 204 DEFINE_RPMPD_VFL(qcs404, vdd_lpimx_vfl, RWLM, 0);
 205
 206 static struct rpmpd *qcs404_rpmpds[] = {
 207         [QCS404_VDDMX] = &qcs404_vddmx,
 208         [QCS404_VDDMX_AO] = &qcs404_vddmx_ao,
 209         [QCS404_VDDMX_VFL] = &qcs404_vddmx_vfl,
 210         [QCS404_LPICX] = &qcs404_vdd_lpicx,
 211         [QCS404_LPICX_VFL] = &qcs404_vdd_lpicx_vfl,
 212         [QCS404_LPIMX] = &qcs404_vdd_lpimx,
 213         [QCS404_LPIMX_VFL] = &qcs404_vdd_lpimx_vfl,
 214 };
 215
 216 static const struct rpmpd_desc qcs404_desc = {
 217         .rpmpds = qcs404_rpmpds,
 218         .num_pds = ARRAY_SIZE(qcs404_rpmpds),
 219         .max_state = RPM_SMD_LEVEL_BINNING,
 220 };
 221
 222 static const struct of_device_id rpmpd_match_table[] = {
 223         { .compatible = "qcom,msm8976-rpmpd", .data = &msm8976_desc },
 224         { .compatible = "qcom,msm8996-rpmpd", .data = &msm8996_desc },
 225         { .compatible = "qcom,msm8998-rpmpd", .data = &msm8998_desc },
 226         { .compatible = "qcom,qcs404-rpmpd", .data = &qcs404_desc },
 227         { }
 228 };
 229
 230 static int rpmpd_send_enable(struct rpmpd *pd, bool enable)
 231 {
 232         struct rpmpd_req req = {
 233                 .key = KEY_ENABLE,
 234                 .nbytes = cpu_to_le32(sizeof(u32)),
 235                 .value = cpu_to_le32(enable),
 236         };
 237
 238         return qcom_rpm_smd_write(pd->rpm, QCOM_SMD_RPM_ACTIVE_STATE,
 239                                   pd->res_type, pd->res_id, &req, sizeof(req));
 240 }
 241
 242 static int rpmpd_send_corner(struct rpmpd *pd, int state, unsigned int corner)
 243 {
 244         struct rpmpd_req req = {
 245                 .key = pd->key,
 246                 .nbytes = cpu_to_le32(sizeof(u32)),
 247                 .value = cpu_to_le32(corner),
 248         };
 249
 250         return qcom_rpm_smd_write(pd->rpm, state, pd->res_type, pd->res_id,
 251                                   &req, sizeof(req));
 252 };
 253
 254 static void to_active_sleep(struct rpmpd *pd, unsigned int corner,
 255                             unsigned int *active, unsigned int *sleep)
 256 {
 257         *active = corner;
 258
 259         if (pd->active_only)
 260                 *sleep = 0;
 261         else
 262                 *sleep = *active;
 263 }
 264
 265 static int rpmpd_aggregate_corner(struct rpmpd *pd)
 266 {
 267         int ret;
 268         struct rpmpd *peer = pd->peer;
 269         unsigned int active_corner, sleep_corner;
 270         unsigned int this_active_corner = 0, this_sleep_corner = 0;
 271         unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
 272
 273         to_active_sleep(pd, pd->corner, &this_active_corner, &this_sleep_corner);
 274
 275         if (peer && peer->enabled)
 276                 to_active_sleep(peer, peer->corner, &peer_active_corner,
 277                                 &peer_sleep_corner);
 278
 279         active_corner = max(this_active_corner, peer_active_corner);
 280
 281         ret = rpmpd_send_corner(pd, QCOM_SMD_RPM_ACTIVE_STATE, active_corner);
 282         if (ret)
 283                 return ret;
 284
 285         sleep_corner = max(this_sleep_corner, peer_sleep_corner);
 286
 287         return rpmpd_send_corner(pd, QCOM_SMD_RPM_SLEEP_STATE, sleep_corner);
 288 }
 289
 290 static int rpmpd_power_on(struct generic_pm_domain *domain)
 291 {
 292         int ret;
 293         struct rpmpd *pd = domain_to_rpmpd(domain);
 294
 295         mutex_lock(&rpmpd_lock);
 296
 297         ret = rpmpd_send_enable(pd, true);
 298         if (ret)
 299                 goto out;
 300
 301         pd->enabled = true;
 302
 303         if (pd->corner)
 304                 ret = rpmpd_aggregate_corner(pd);
 305
 306 out:
 307         mutex_unlock(&rpmpd_lock);
 308
 309         return ret;
 310 }
 311
 312 static int rpmpd_power_off(struct generic_pm_domain *domain)
 313 {
 314         int ret;
 315         struct rpmpd *pd = domain_to_rpmpd(domain);
 316
 317         mutex_lock(&rpmpd_lock);
 318
 319         ret = rpmpd_send_enable(pd, false);
 320         if (!ret)
 321                 pd->enabled = false;
 322
 323         mutex_unlock(&rpmpd_lock);
 324
 325         return ret;
 326 }
 327
 328 static int rpmpd_set_performance(struct generic_pm_domain *domain,
 329                                  unsigned int state)
 330 {
 331         int ret = 0;
 332         struct rpmpd *pd = domain_to_rpmpd(domain);
 333
 334         if (state > pd->max_state)
 335                 state = pd->max_state;
 336
 337         mutex_lock(&rpmpd_lock);
 338
 339         pd->corner = state;
 340
 341         /* Always send updates for vfc and vfl */
 342         if (!pd->enabled && pd->key != KEY_FLOOR_CORNER &&
 343             pd->key != KEY_FLOOR_LEVEL)
 344                 goto out;
 345
 346         ret = rpmpd_aggregate_corner(pd);
 347
 348 out:
 349         mutex_unlock(&rpmpd_lock);
 350
 351         return ret;
 352 }
 353
 354 static unsigned int rpmpd_get_performance(struct generic_pm_domain *genpd,
 355                                           struct dev_pm_opp *opp)
 356 {
 357         return dev_pm_opp_get_level(opp);
 358 }
 359
 360 static int rpmpd_probe(struct platform_device *pdev)
 361 {
 362         int i;
 363         size_t num;
 364         struct genpd_onecell_data *data;
 365         struct qcom_smd_rpm *rpm;
 366         struct rpmpd **rpmpds;
 367         const struct rpmpd_desc *desc;
 368
 369         rpm = dev_get_drvdata(pdev->dev.parent);
 370         if (!rpm) {
 371                 dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
 372                 return -ENODEV;
 373         }
 374
 375         desc = of_device_get_match_data(&pdev->dev);
 376         if (!desc)
 377                 return -EINVAL;
 378
 379         rpmpds = desc->rpmpds;
 380         num = desc->num_pds;
 381
 382         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 383         if (!data)
 384                 return -ENOMEM;
 385
 386         data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains),
 387                                      GFP_KERNEL);
 388         data->num_domains = num;
 389
 390         for (i = 0; i < num; i++) {
 391                 if (!rpmpds[i]) {
 392                         dev_warn(&pdev->dev, "rpmpds[] with empty entry at index=%d\n",
 393                                  i);
 394                         continue;
 395                 }
 396
 397                 rpmpds[i]->rpm = rpm;
 398                 rpmpds[i]->max_state = desc->max_state;
 399                 rpmpds[i]->pd.power_off = rpmpd_power_off;
 400                 rpmpds[i]->pd.power_on = rpmpd_power_on;
 401                 rpmpds[i]->pd.set_performance_state = rpmpd_set_performance;
 402                 rpmpds[i]->pd.opp_to_performance_state = rpmpd_get_performance;
 403                 pm_genpd_init(&rpmpds[i]->pd, NULL, true);
 404
 405                 data->domains[i] = &rpmpds[i]->pd;
 406         }
 407
 408         return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
 409 }
 410
 411 static struct platform_driver rpmpd_driver = {
 412         .driver = {
 413                 .name = "qcom-rpmpd",
 414                 .of_match_table = rpmpd_match_table,
 415                 .suppress_bind_attrs = true,
 416         },
 417         .probe = rpmpd_probe,
 418 };
 419
 420 static int __init rpmpd_init(void)
 421 {
 422         return platform_driver_register(&rpmpd_driver);
 423 }
 424 core_initcall(rpmpd_init);