drivers/cpufreq/mediatek-cpufreq.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2015 Linaro Ltd.
   4  * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
   5  */
   6
   7 #include <linux/clk.h>
   8 #include <linux/cpu.h>
   9 #include <linux/cpufreq.h>
  10 #include <linux/cpumask.h>
  11 #include <linux/minmax.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/of_platform.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_opp.h>
  17 #include <linux/regulator/consumer.h>
  18
  19 struct mtk_cpufreq_platform_data {
  20         int min_volt_shift;
  21         int max_volt_shift;
  22         int proc_max_volt;
  23         int sram_min_volt;
  24         int sram_max_volt;
  25         bool ccifreq_supported;
  26 };
  27
  28 /*
  29  * The struct mtk_cpu_dvfs_info holds necessary information for doing CPU DVFS
  30  * on each CPU power/clock domain of Mediatek SoCs. Each CPU cluster in
  31  * Mediatek SoCs has two voltage inputs, Vproc and Vsram. In some cases the two
  32  * voltage inputs need to be controlled under a hardware limitation:
  33  * 100mV < Vsram - Vproc < 200mV
  34  *
  35  * When scaling the clock frequency of a CPU clock domain, the clock source
  36  * needs to be switched to another stable PLL clock temporarily until
  37  * the original PLL becomes stable at target frequency.
  38  */
  39 struct mtk_cpu_dvfs_info {
  40         struct cpumask cpus;
  41         struct device *cpu_dev;
  42         struct device *cci_dev;
  43         struct regulator *proc_reg;
  44         struct regulator *sram_reg;
  45         struct clk *cpu_clk;
  46         struct clk *inter_clk;
  47         struct list_head list_head;
  48         int intermediate_voltage;
  49         bool need_voltage_tracking;
  50         int vproc_on_boot;
  51         int pre_vproc;
  52         /* Avoid race condition for regulators between notify and policy */
  53         struct mutex reg_lock;
  54         struct notifier_block opp_nb;
  55         unsigned int opp_cpu;
  56         unsigned long current_freq;
  57         const struct mtk_cpufreq_platform_data *soc_data;
  58         int vtrack_max;
  59         bool ccifreq_bound;
  60 };
  61
  62 static struct platform_device *cpufreq_pdev;
  63
  64 static LIST_HEAD(dvfs_info_list);
  65
  66 static struct mtk_cpu_dvfs_info *mtk_cpu_dvfs_info_lookup(int cpu)
  67 {
  68         struct mtk_cpu_dvfs_info *info;
  69
  70         list_for_each_entry(info, &dvfs_info_list, list_head) {
  71                 if (cpumask_test_cpu(cpu, &info->cpus))
  72                         return info;
  73         }
  74
  75         return NULL;
  76 }
  77
  78 static int mtk_cpufreq_voltage_tracking(struct mtk_cpu_dvfs_info *info,
  79                                         int new_vproc)
  80 {
  81         const struct mtk_cpufreq_platform_data *soc_data = info->soc_data;
  82         struct regulator *proc_reg = info->proc_reg;
  83         struct regulator *sram_reg = info->sram_reg;
  84         int pre_vproc, pre_vsram, new_vsram, vsram, vproc, ret;
  85         int retry = info->vtrack_max;
  86
  87         pre_vproc = regulator_get_voltage(proc_reg);
  88         if (pre_vproc < 0) {
  89                 dev_err(info->cpu_dev,
  90                         "invalid Vproc value: %d\n", pre_vproc);
  91                 return pre_vproc;
  92         }
  93
  94         pre_vsram = regulator_get_voltage(sram_reg);
  95         if (pre_vsram < 0) {
  96                 dev_err(info->cpu_dev, "invalid Vsram value: %d\n", pre_vsram);
  97                 return pre_vsram;
  98         }
  99
 100         new_vsram = clamp(new_vproc + soc_data->min_volt_shift,
 101                           soc_data->sram_min_volt, soc_data->sram_max_volt);
 102
 103         do {
 104                 if (pre_vproc <= new_vproc) {
 105                         vsram = clamp(pre_vproc + soc_data->max_volt_shift,
 106                                       soc_data->sram_min_volt, new_vsram);
 107                         ret = regulator_set_voltage(sram_reg, vsram,
 108                                                     soc_data->sram_max_volt);
 109
 110                         if (ret)
 111                                 return ret;
 112
 113                         if (vsram == soc_data->sram_max_volt ||
 114                             new_vsram == soc_data->sram_min_volt)
 115                                 vproc = new_vproc;
 116                         else
 117                                 vproc = vsram - soc_data->min_volt_shift;
 118
 119                         ret = regulator_set_voltage(proc_reg, vproc,
 120                                                     soc_data->proc_max_volt);
 121                         if (ret) {
 122                                 regulator_set_voltage(sram_reg, pre_vsram,
 123                                                       soc_data->sram_max_volt);
 124                                 return ret;
 125                         }
 126                 } else if (pre_vproc > new_vproc) {
 127                         vproc = max(new_vproc,
 128                                     pre_vsram - soc_data->max_volt_shift);
 129                         ret = regulator_set_voltage(proc_reg, vproc,
 130                                                     soc_data->proc_max_volt);
 131                         if (ret)
 132                                 return ret;
 133
 134                         if (vproc == new_vproc)
 135                                 vsram = new_vsram;
 136                         else
 137                                 vsram = max(new_vsram,
 138                                             vproc + soc_data->min_volt_shift);
 139
 140                         ret = regulator_set_voltage(sram_reg, vsram,
 141                                                     soc_data->sram_max_volt);
 142                         if (ret) {
 143                                 regulator_set_voltage(proc_reg, pre_vproc,
 144                                                       soc_data->proc_max_volt);
 145                                 return ret;
 146                         }
 147                 }
 148
 149                 pre_vproc = vproc;
 150                 pre_vsram = vsram;
 151
 152                 if (--retry < 0) {
 153                         dev_err(info->cpu_dev,
 154                                 "over loop count, failed to set voltage\n");
 155                         return -EINVAL;
 156                 }
 157         } while (vproc != new_vproc || vsram != new_vsram);
 158
 159         return 0;
 160 }
 161
 162 static int mtk_cpufreq_set_voltage(struct mtk_cpu_dvfs_info *info, int vproc)
 163 {
 164         const struct mtk_cpufreq_platform_data *soc_data = info->soc_data;
 165         int ret;
 166
 167         if (info->need_voltage_tracking)
 168                 ret = mtk_cpufreq_voltage_tracking(info, vproc);
 169         else
 170                 ret = regulator_set_voltage(info->proc_reg, vproc,
 171                                             soc_data->proc_max_volt);
 172         if (!ret)
 173                 info->pre_vproc = vproc;
 174
 175         return ret;
 176 }
 177
 178 static bool is_ccifreq_ready(struct mtk_cpu_dvfs_info *info)
 179 {
 180         struct device_link *sup_link;
 181
 182         if (info->ccifreq_bound)
 183                 return true;
 184
 185         sup_link = device_link_add(info->cpu_dev, info->cci_dev,
 186                                    DL_FLAG_AUTOREMOVE_CONSUMER);
 187         if (!sup_link) {
 188                 dev_err(info->cpu_dev, "cpu%d: sup_link is NULL\n", info->opp_cpu);
 189                 return false;
 190         }
 191
 192         if (sup_link->supplier->links.status != DL_DEV_DRIVER_BOUND)
 193                 return false;
 194
 195         info->ccifreq_bound = true;
 196
 197         return true;
 198 }
 199
 200 static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
 201                                   unsigned int index)
 202 {
 203         struct cpufreq_frequency_table *freq_table = policy->freq_table;
 204         struct clk *cpu_clk = policy->clk;
 205         struct clk *armpll = clk_get_parent(cpu_clk);
 206         struct mtk_cpu_dvfs_info *info = policy->driver_data;
 207         struct device *cpu_dev = info->cpu_dev;
 208         struct dev_pm_opp *opp;
 209         long freq_hz, pre_freq_hz;
 210         int vproc, pre_vproc, inter_vproc, target_vproc, ret;
 211
 212         inter_vproc = info->intermediate_voltage;
 213
 214         pre_freq_hz = clk_get_rate(cpu_clk);
 215
 216         mutex_lock(&info->reg_lock);
 217
 218         if (unlikely(info->pre_vproc <= 0))
 219                 pre_vproc = regulator_get_voltage(info->proc_reg);
 220         else
 221                 pre_vproc = info->pre_vproc;
 222
 223         if (pre_vproc < 0) {
 224                 dev_err(cpu_dev, "invalid Vproc value: %d\n", pre_vproc);
 225                 ret = pre_vproc;
 226                 goto out;
 227         }
 228
 229         freq_hz = freq_table[index].frequency * 1000;
 230
 231         opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_hz);
 232         if (IS_ERR(opp)) {
 233                 dev_err(cpu_dev, "cpu%d: failed to find OPP for %ld\n",
 234                         policy->cpu, freq_hz);
 235                 ret = PTR_ERR(opp);
 236                 goto out;
 237         }
 238         vproc = dev_pm_opp_get_voltage(opp);
 239         dev_pm_opp_put(opp);
 240
 241         /*
 242          * If MediaTek cci is supported but is not ready, we will use the value
 243          * of max(target cpu voltage, booting voltage) to prevent high freqeuncy
 244          * low voltage crash.
 245          */
 246         if (info->soc_data->ccifreq_supported && !is_ccifreq_ready(info))
 247                 vproc = max(vproc, info->vproc_on_boot);
 248
 249         /*
 250          * If the new voltage or the intermediate voltage is higher than the
 251          * current voltage, scale up voltage first.
 252          */
 253         target_vproc = max(inter_vproc, vproc);
 254         if (pre_vproc <= target_vproc) {
 255                 ret = mtk_cpufreq_set_voltage(info, target_vproc);
 256                 if (ret) {
 257                         dev_err(cpu_dev,
 258                                 "cpu%d: failed to scale up voltage!\n", policy->cpu);
 259                         mtk_cpufreq_set_voltage(info, pre_vproc);
 260                         goto out;
 261                 }
 262         }
 263
 264         /* Reparent the CPU clock to intermediate clock. */
 265         ret = clk_set_parent(cpu_clk, info->inter_clk);
 266         if (ret) {
 267                 dev_err(cpu_dev,
 268                         "cpu%d: failed to re-parent cpu clock!\n", policy->cpu);
 269                 mtk_cpufreq_set_voltage(info, pre_vproc);
 270                 goto out;
 271         }
 272
 273         /* Set the original PLL to target rate. */
 274         ret = clk_set_rate(armpll, freq_hz);
 275         if (ret) {
 276                 dev_err(cpu_dev,
 277                         "cpu%d: failed to scale cpu clock rate!\n", policy->cpu);
 278                 clk_set_parent(cpu_clk, armpll);
 279                 mtk_cpufreq_set_voltage(info, pre_vproc);
 280                 goto out;
 281         }
 282
 283         /* Set parent of CPU clock back to the original PLL. */
 284         ret = clk_set_parent(cpu_clk, armpll);
 285         if (ret) {
 286                 dev_err(cpu_dev,
 287                         "cpu%d: failed to re-parent cpu clock!\n", policy->cpu);
 288                 mtk_cpufreq_set_voltage(info, inter_vproc);
 289                 goto out;
 290         }
 291
 292         /*
 293          * If the new voltage is lower than the intermediate voltage or the
 294          * original voltage, scale down to the new voltage.
 295          */
 296         if (vproc < inter_vproc || vproc < pre_vproc) {
 297                 ret = mtk_cpufreq_set_voltage(info, vproc);
 298                 if (ret) {
 299                         dev_err(cpu_dev,
 300                                 "cpu%d: failed to scale down voltage!\n", policy->cpu);
 301                         clk_set_parent(cpu_clk, info->inter_clk);
 302                         clk_set_rate(armpll, pre_freq_hz);
 303                         clk_set_parent(cpu_clk, armpll);
 304                         goto out;
 305                 }
 306         }
 307
 308         info->current_freq = freq_hz;
 309
 310 out:
 311         mutex_unlock(&info->reg_lock);
 312
 313         return ret;
 314 }
 315
 316 #define DYNAMIC_POWER "dynamic-power-coefficient"
 317
 318 static int mtk_cpufreq_opp_notifier(struct notifier_block *nb,
 319                                     unsigned long event, void *data)
 320 {
 321         struct dev_pm_opp *opp = data;
 322         struct dev_pm_opp *new_opp;
 323         struct mtk_cpu_dvfs_info *info;
 324         unsigned long freq, volt;
 325         struct cpufreq_policy *policy;
 326         int ret = 0;
 327
 328         info = container_of(nb, struct mtk_cpu_dvfs_info, opp_nb);
 329
 330         if (event == OPP_EVENT_ADJUST_VOLTAGE) {
 331                 freq = dev_pm_opp_get_freq(opp);
 332
 333                 mutex_lock(&info->reg_lock);
 334                 if (info->current_freq == freq) {
 335                         volt = dev_pm_opp_get_voltage(opp);
 336                         ret = mtk_cpufreq_set_voltage(info, volt);
 337                         if (ret)
 338                                 dev_err(info->cpu_dev,
 339                                         "failed to scale voltage: %d\n", ret);
 340                 }
 341                 mutex_unlock(&info->reg_lock);
 342         } else if (event == OPP_EVENT_DISABLE) {
 343                 freq = dev_pm_opp_get_freq(opp);
 344
 345                 /* case of current opp item is disabled */
 346                 if (info->current_freq == freq) {
 347                         freq = 1;
 348                         new_opp = dev_pm_opp_find_freq_ceil(info->cpu_dev,
 349                                                             &freq);
 350                         if (IS_ERR(new_opp)) {
 351                                 dev_err(info->cpu_dev,
 352                                         "all opp items are disabled\n");
 353                                 ret = PTR_ERR(new_opp);
 354                                 return notifier_from_errno(ret);
 355                         }
 356
 357                         dev_pm_opp_put(new_opp);
 358                         policy = cpufreq_cpu_get(info->opp_cpu);
 359                         if (policy) {
 360                                 cpufreq_driver_target(policy, freq / 1000,
 361                                                       CPUFREQ_RELATION_L);
 362                                 cpufreq_cpu_put(policy);
 363                         }
 364                 }
 365         }
 366
 367         return notifier_from_errno(ret);
 368 }
 369
 370 static struct device *of_get_cci(struct device *cpu_dev)
 371 {
 372         struct device_node *np;
 373         struct platform_device *pdev;
 374
 375         np = of_parse_phandle(cpu_dev->of_node, "mediatek,cci", 0);
 376         if (!np)
 377                 return ERR_PTR(-ENODEV);
 378
 379         pdev = of_find_device_by_node(np);
 380         of_node_put(np);
 381         if (!pdev)
 382                 return ERR_PTR(-ENODEV);
 383
 384         return &pdev->dev;
 385 }
 386
 387 static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
 388 {
 389         struct device *cpu_dev;
 390         struct dev_pm_opp *opp;
 391         unsigned long rate;
 392         int ret;
 393
 394         cpu_dev = get_cpu_device(cpu);
 395         if (!cpu_dev) {
 396                 dev_err(cpu_dev, "failed to get cpu%d device\n", cpu);
 397                 return -ENODEV;
 398         }
 399         info->cpu_dev = cpu_dev;
 400
 401         info->ccifreq_bound = false;
 402         if (info->soc_data->ccifreq_supported) {
 403                 info->cci_dev = of_get_cci(info->cpu_dev);
 404                 if (IS_ERR(info->cci_dev)) {
 405                         ret = PTR_ERR(info->cci_dev);
 406                         dev_err(cpu_dev, "cpu%d: failed to get cci device\n", cpu);
 407                         return -ENODEV;
 408                 }
 409         }
 410
 411         info->cpu_clk = clk_get(cpu_dev, "cpu");
 412         if (IS_ERR(info->cpu_clk)) {
 413                 ret = PTR_ERR(info->cpu_clk);
 414                 return dev_err_probe(cpu_dev, ret,
 415                                      "cpu%d: failed to get cpu clk\n", cpu);
 416         }
 417
 418         info->inter_clk = clk_get(cpu_dev, "intermediate");
 419         if (IS_ERR(info->inter_clk)) {
 420                 ret = PTR_ERR(info->inter_clk);
 421                 dev_err_probe(cpu_dev, ret,
 422                               "cpu%d: failed to get intermediate clk\n", cpu);
 423                 goto out_free_mux_clock;
 424         }
 425
 426         info->proc_reg = regulator_get_optional(cpu_dev, "proc");
 427         if (IS_ERR(info->proc_reg)) {
 428                 ret = PTR_ERR(info->proc_reg);
 429                 dev_err_probe(cpu_dev, ret,
 430                               "cpu%d: failed to get proc regulator\n", cpu);
 431                 goto out_free_inter_clock;
 432         }
 433
 434         ret = regulator_enable(info->proc_reg);
 435         if (ret) {
 436                 dev_warn(cpu_dev, "cpu%d: failed to enable vproc\n", cpu);
 437                 goto out_free_proc_reg;
 438         }
 439
 440         /* Both presence and absence of sram regulator are valid cases. */
 441         info->sram_reg = regulator_get_optional(cpu_dev, "sram");
 442         if (IS_ERR(info->sram_reg)) {
 443                 ret = PTR_ERR(info->sram_reg);
 444                 if (ret == -EPROBE_DEFER)
 445                         goto out_disable_proc_reg;
 446
 447                 info->sram_reg = NULL;
 448         } else {
 449                 ret = regulator_enable(info->sram_reg);
 450                 if (ret) {
 451                         dev_warn(cpu_dev, "cpu%d: failed to enable vsram\n", cpu);
 452                         goto out_free_sram_reg;
 453                 }
 454         }
 455
 456         /* Get OPP-sharing information from "operating-points-v2" bindings */
 457         ret = dev_pm_opp_of_get_sharing_cpus(cpu_dev, &info->cpus);
 458         if (ret) {
 459                 dev_err(cpu_dev,
 460                         "cpu%d: failed to get OPP-sharing information\n", cpu);
 461                 goto out_disable_sram_reg;
 462         }
 463
 464         ret = dev_pm_opp_of_cpumask_add_table(&info->cpus);
 465         if (ret) {
 466                 dev_warn(cpu_dev, "cpu%d: no OPP table\n", cpu);
 467                 goto out_disable_sram_reg;
 468         }
 469
 470         ret = clk_prepare_enable(info->cpu_clk);
 471         if (ret)
 472                 goto out_free_opp_table;
 473
 474         ret = clk_prepare_enable(info->inter_clk);
 475         if (ret)
 476                 goto out_disable_mux_clock;
 477
 478         if (info->soc_data->ccifreq_supported) {
 479                 info->vproc_on_boot = regulator_get_voltage(info->proc_reg);
 480                 if (info->vproc_on_boot < 0) {
 481                         ret = info->vproc_on_boot;
 482                         dev_err(info->cpu_dev,
 483                                 "invalid Vproc value: %d\n", info->vproc_on_boot);
 484                         goto out_disable_inter_clock;
 485                 }
 486         }
 487
 488         /* Search a safe voltage for intermediate frequency. */
 489         rate = clk_get_rate(info->inter_clk);
 490         opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
 491         if (IS_ERR(opp)) {
 492                 dev_err(cpu_dev, "cpu%d: failed to get intermediate opp\n", cpu);
 493                 ret = PTR_ERR(opp);
 494                 goto out_disable_inter_clock;
 495         }
 496         info->intermediate_voltage = dev_pm_opp_get_voltage(opp);
 497         dev_pm_opp_put(opp);
 498
 499         mutex_init(&info->reg_lock);
 500         info->current_freq = clk_get_rate(info->cpu_clk);
 501
 502         info->opp_cpu = cpu;
 503         info->opp_nb.notifier_call = mtk_cpufreq_opp_notifier;
 504         ret = dev_pm_opp_register_notifier(cpu_dev, &info->opp_nb);
 505         if (ret) {
 506                 dev_err(cpu_dev, "cpu%d: failed to register opp notifier\n", cpu);
 507                 goto out_disable_inter_clock;
 508         }
 509
 510         /*
 511          * If SRAM regulator is present, software "voltage tracking" is needed
 512          * for this CPU power domain.
 513          */
 514         info->need_voltage_tracking = (info->sram_reg != NULL);
 515
 516         /*
 517          * We assume min voltage is 0 and tracking target voltage using
 518          * min_volt_shift for each iteration.
 519          * The vtrack_max is 3 times of expeted iteration count.
 520          */
 521         info->vtrack_max = 3 * DIV_ROUND_UP(max(info->soc_data->sram_max_volt,
 522                                                 info->soc_data->proc_max_volt),
 523                                             info->soc_data->min_volt_shift);
 524
 525         return 0;
 526
 527 out_disable_inter_clock:
 528         clk_disable_unprepare(info->inter_clk);
 529
 530 out_disable_mux_clock:
 531         clk_disable_unprepare(info->cpu_clk);
 532
 533 out_free_opp_table:
 534         dev_pm_opp_of_cpumask_remove_table(&info->cpus);
 535
 536 out_disable_sram_reg:
 537         if (info->sram_reg)
 538                 regulator_disable(info->sram_reg);
 539
 540 out_free_sram_reg:
 541         if (info->sram_reg)
 542                 regulator_put(info->sram_reg);
 543
 544 out_disable_proc_reg:
 545         regulator_disable(info->proc_reg);
 546
 547 out_free_proc_reg:
 548         regulator_put(info->proc_reg);
 549
 550 out_free_inter_clock:
 551         clk_put(info->inter_clk);
 552
 553 out_free_mux_clock:
 554         clk_put(info->cpu_clk);
 555
 556         return ret;
 557 }
 558
 559 static void mtk_cpu_dvfs_info_release(struct mtk_cpu_dvfs_info *info)
 560 {
 561         regulator_disable(info->proc_reg);
 562         regulator_put(info->proc_reg);
 563         if (info->sram_reg) {
 564                 regulator_disable(info->sram_reg);
 565                 regulator_put(info->sram_reg);
 566         }
 567         clk_disable_unprepare(info->cpu_clk);
 568         clk_put(info->cpu_clk);
 569         clk_disable_unprepare(info->inter_clk);
 570         clk_put(info->inter_clk);
 571         dev_pm_opp_of_cpumask_remove_table(&info->cpus);
 572         dev_pm_opp_unregister_notifier(info->cpu_dev, &info->opp_nb);
 573 }
 574
 575 static int mtk_cpufreq_init(struct cpufreq_policy *policy)
 576 {
 577         struct mtk_cpu_dvfs_info *info;
 578         struct cpufreq_frequency_table *freq_table;
 579         int ret;
 580
 581         info = mtk_cpu_dvfs_info_lookup(policy->cpu);
 582         if (!info) {
 583                 pr_err("dvfs info for cpu%d is not initialized.\n",
 584                         policy->cpu);
 585                 return -EINVAL;
 586         }
 587
 588         ret = dev_pm_opp_init_cpufreq_table(info->cpu_dev, &freq_table);
 589         if (ret) {
 590                 dev_err(info->cpu_dev,
 591                         "failed to init cpufreq table for cpu%d: %d\n",
 592                         policy->cpu, ret);
 593                 return ret;
 594         }
 595
 596         cpumask_copy(policy->cpus, &info->cpus);
 597         policy->freq_table = freq_table;
 598         policy->driver_data = info;
 599         policy->clk = info->cpu_clk;
 600
 601         return 0;
 602 }
 603
 604 static int mtk_cpufreq_exit(struct cpufreq_policy *policy)
 605 {
 606         struct mtk_cpu_dvfs_info *info = policy->driver_data;
 607
 608         dev_pm_opp_free_cpufreq_table(info->cpu_dev, &policy->freq_table);
 609
 610         return 0;
 611 }
 612
 613 static struct cpufreq_driver mtk_cpufreq_driver = {
 614         .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
 615                  CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
 616                  CPUFREQ_IS_COOLING_DEV,
 617         .verify = cpufreq_generic_frequency_table_verify,
 618         .target_index = mtk_cpufreq_set_target,
 619         .get = cpufreq_generic_get,
 620         .init = mtk_cpufreq_init,
 621         .exit = mtk_cpufreq_exit,
 622         .register_em = cpufreq_register_em_with_opp,
 623         .name = "mtk-cpufreq",
 624         .attr = cpufreq_generic_attr,
 625 };
 626
 627 static int mtk_cpufreq_probe(struct platform_device *pdev)
 628 {
 629         const struct mtk_cpufreq_platform_data *data;
 630         struct mtk_cpu_dvfs_info *info, *tmp;
 631         int cpu, ret;
 632
 633         data = dev_get_platdata(&pdev->dev);
 634         if (!data) {
 635                 dev_err(&pdev->dev,
 636                         "failed to get mtk cpufreq platform data\n");
 637                 return -ENODEV;
 638         }
 639
 640         for_each_possible_cpu(cpu) {
 641                 info = mtk_cpu_dvfs_info_lookup(cpu);
 642                 if (info)
 643                         continue;
 644
 645                 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 646                 if (!info) {
 647                         ret = -ENOMEM;
 648                         goto release_dvfs_info_list;
 649                 }
 650
 651                 info->soc_data = data;
 652                 ret = mtk_cpu_dvfs_info_init(info, cpu);
 653                 if (ret) {
 654                         dev_err(&pdev->dev,
 655                                 "failed to initialize dvfs info for cpu%d\n",
 656                                 cpu);
 657                         goto release_dvfs_info_list;
 658                 }
 659
 660                 list_add(&info->list_head, &dvfs_info_list);
 661         }
 662
 663         ret = cpufreq_register_driver(&mtk_cpufreq_driver);
 664         if (ret) {
 665                 dev_err(&pdev->dev, "failed to register mtk cpufreq driver\n");
 666                 goto release_dvfs_info_list;
 667         }
 668
 669         return 0;
 670
 671 release_dvfs_info_list:
 672         list_for_each_entry_safe(info, tmp, &dvfs_info_list, list_head) {
 673                 mtk_cpu_dvfs_info_release(info);
 674                 list_del(&info->list_head);
 675         }
 676
 677         return ret;
 678 }
 679
 680 static struct platform_driver mtk_cpufreq_platdrv = {
 681         .driver = {
 682                 .name   = "mtk-cpufreq",
 683         },
 684         .probe          = mtk_cpufreq_probe,
 685 };
 686
 687 static const struct mtk_cpufreq_platform_data mt2701_platform_data = {
 688         .min_volt_shift = 100000,
 689         .max_volt_shift = 200000,
 690         .proc_max_volt = 1150000,
 691         .sram_min_volt = 0,
 692         .sram_max_volt = 1150000,
 693         .ccifreq_supported = false,
 694 };
 695
 696 static const struct mtk_cpufreq_platform_data mt7622_platform_data = {
 697         .min_volt_shift = 100000,
 698         .max_volt_shift = 200000,
 699         .proc_max_volt = 1360000,
 700         .sram_min_volt = 0,
 701         .sram_max_volt = 1360000,
 702         .ccifreq_supported = false,
 703 };
 704
 705 static const struct mtk_cpufreq_platform_data mt8183_platform_data = {
 706         .min_volt_shift = 100000,
 707         .max_volt_shift = 200000,
 708         .proc_max_volt = 1150000,
 709         .sram_min_volt = 0,
 710         .sram_max_volt = 1150000,
 711         .ccifreq_supported = true,
 712 };
 713
 714 static const struct mtk_cpufreq_platform_data mt8186_platform_data = {
 715         .min_volt_shift = 100000,
 716         .max_volt_shift = 250000,
 717         .proc_max_volt = 1118750,
 718         .sram_min_volt = 850000,
 719         .sram_max_volt = 1118750,
 720         .ccifreq_supported = true,
 721 };
 722
 723 static const struct mtk_cpufreq_platform_data mt8516_platform_data = {
 724         .min_volt_shift = 100000,
 725         .max_volt_shift = 200000,
 726         .proc_max_volt = 1310000,
 727         .sram_min_volt = 0,
 728         .sram_max_volt = 1310000,
 729         .ccifreq_supported = false,
 730 };
 731
 732 /* List of machines supported by this driver */
 733 static const struct of_device_id mtk_cpufreq_machines[] __initconst = {
 734         { .compatible = "mediatek,mt2701", .data = &mt2701_platform_data },
 735         { .compatible = "mediatek,mt2712", .data = &mt2701_platform_data },
 736         { .compatible = "mediatek,mt7622", .data = &mt7622_platform_data },
 737         { .compatible = "mediatek,mt7623", .data = &mt7622_platform_data },
 738         { .compatible = "mediatek,mt8167", .data = &mt8516_platform_data },
 739         { .compatible = "mediatek,mt817x", .data = &mt2701_platform_data },
 740         { .compatible = "mediatek,mt8173", .data = &mt2701_platform_data },
 741         { .compatible = "mediatek,mt8176", .data = &mt2701_platform_data },
 742         { .compatible = "mediatek,mt8183", .data = &mt8183_platform_data },
 743         { .compatible = "mediatek,mt8186", .data = &mt8186_platform_data },
 744         { .compatible = "mediatek,mt8365", .data = &mt2701_platform_data },
 745         { .compatible = "mediatek,mt8516", .data = &mt8516_platform_data },
 746         { }
 747 };
 748 MODULE_DEVICE_TABLE(of, mtk_cpufreq_machines);
 749
 750 static int __init mtk_cpufreq_driver_init(void)
 751 {
 752         struct device_node *np;
 753         const struct of_device_id *match;
 754         const struct mtk_cpufreq_platform_data *data;
 755         int err;
 756
 757         np = of_find_node_by_path("/");
 758         if (!np)
 759                 return -ENODEV;
 760
 761         match = of_match_node(mtk_cpufreq_machines, np);
 762         of_node_put(np);
 763         if (!match) {
 764                 pr_debug("Machine is not compatible with mtk-cpufreq\n");
 765                 return -ENODEV;
 766         }
 767         data = match->data;
 768
 769         err = platform_driver_register(&mtk_cpufreq_platdrv);
 770         if (err)
 771                 return err;
 772
 773         /*
 774          * Since there's no place to hold device registration code and no
 775          * device tree based way to match cpufreq driver yet, both the driver
 776          * and the device registration codes are put here to handle defer
 777          * probing.
 778          */
 779         cpufreq_pdev = platform_device_register_data(NULL, "mtk-cpufreq", -1,
 780                                                      data, sizeof(*data));
 781         if (IS_ERR(cpufreq_pdev)) {
 782                 pr_err("failed to register mtk-cpufreq platform device\n");
 783                 platform_driver_unregister(&mtk_cpufreq_platdrv);
 784                 return PTR_ERR(cpufreq_pdev);
 785         }
 786
 787         return 0;
 788 }
 789 module_init(mtk_cpufreq_driver_init)
 790
 791 static void __exit mtk_cpufreq_driver_exit(void)
 792 {
 793         platform_device_unregister(cpufreq_pdev);
 794         platform_driver_unregister(&mtk_cpufreq_platdrv);
 795 }
 796 module_exit(mtk_cpufreq_driver_exit)
 797
 798 MODULE_DESCRIPTION("MediaTek CPUFreq driver");
 799 MODULE_AUTHOR("Pi-Cheng Chen <pi-cheng.chen@linaro.org>");
 800 MODULE_LICENSE("GPL v2");