drivers/cpufreq/rockchip_big_little.c

   1 /*
   2  * Copyright (C) 2015 Fuzhou Rockchip Electronics Co., Ltd
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17 #include <linux/clk.h>
  18 #include <linux/cpufreq.h>
  19 #include <linux/err.h>
  20 #include <linux/kernel_stat.h>
  21 #include <linux/init.h>
  22 #include <linux/reboot.h>
  23 #include <linux/suspend.h>
  24 #include <linux/tick.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/delay.h>
  27 #include <linux/regulator/consumer.h>
  28 #include <linux/fs.h>
  29 #include <linux/miscdevice.h>
  30 #include <linux/string.h>
  31 #include <linux/rockchip/cpu.h>
  32 #include <linux/rockchip/dvfs.h>
  33 #include <asm/smp_plat.h>
  34 #include <asm/unistd.h>
  35 #include <linux/uaccess.h>
  36 #include <asm/system_misc.h>
  37 #include <linux/cpu.h>
  38 #include <linux/of.h>
  39 #include <linux/mfd/syscon.h>
  40 #include <linux/regmap.h>
  41 #include <linux/rockchip/common.h>
  42 #include <dt-bindings/clock/rk_system_status.h>
  43 #include <linux/platform_device.h>
  44 #include <linux/module.h>
  45 #include "../../../drivers/clk/rockchip/clk-pd.h"
  46
  47 #define RK3368_GRF_CPU_CON(n) (0x500 + 4*n)
  48
  49 #define VERSION "1.0"
  50 #define RK_MAX_CLUSTERS 2
  51
  52 #ifdef DEBUG
  53 #define FREQ_DBG(fmt, args...) pr_debug(fmt, ## args)
  54 #define FREQ_LOG(fmt, args...) pr_debug(fmt, ## args)
  55 #else
  56 #define FREQ_DBG(fmt, args...) do {} while (0)
  57 #define FREQ_LOG(fmt, args...) do {} while (0)
  58 #endif
  59 #define FREQ_ERR(fmt, args...) pr_err(fmt, ## args)
  60
  61 /* Frequency table index must be sequential starting at 0 */
  62 static struct cpufreq_frequency_table default_freq_table[] = {
  63         {.frequency = 312 * 1000,       .index = 875 * 1000},
  64         {.frequency = 504 * 1000,       .index = 925 * 1000},
  65         {.frequency = 816 * 1000,       .index = 975 * 1000},
  66         {.frequency = 1008 * 1000,      .index = 1075 * 1000},
  67         {.frequency = 1200 * 1000,      .index = 1150 * 1000},
  68         {.frequency = 1416 * 1000,      .index = 1250 * 1000},
  69         {.frequency = 1608 * 1000,      .index = 1350 * 1000},
  70         {.frequency = CPUFREQ_TABLE_END},
  71 };
  72
  73 static struct cpufreq_frequency_table *freq_table[RK_MAX_CLUSTERS + 1];
  74 /*********************************************************/
  75 /* additional symantics for "relation" in cpufreq with pm */
  76 #define DISABLE_FURTHER_CPUFREQ         0x10
  77 #define ENABLE_FURTHER_CPUFREQ          0x20
  78 #define MASK_FURTHER_CPUFREQ            0x30
  79 /* With 0x00(NOCHANGE), it depends on the previous "further" status */
  80 #define CPUFREQ_PRIVATE                 0x100
  81 static unsigned int no_cpufreq_access[RK_MAX_CLUSTERS] = { 0 };
  82 static unsigned int suspend_freq[RK_MAX_CLUSTERS] = { 816 * 1000, 816 * 1000 };
  83 static unsigned int suspend_volt = 1100000;
  84 static unsigned int low_battery_freq[RK_MAX_CLUSTERS] = { 600 * 1000,
  85         600 * 1000 };
  86 static unsigned int low_battery_capacity = 5;
  87 static bool is_booting = true;
  88 static DEFINE_MUTEX(cpufreq_mutex);
  89 static struct dvfs_node *clk_cpu_dvfs_node[RK_MAX_CLUSTERS];
  90 static struct dvfs_node *clk_gpu_dvfs_node;
  91 static struct dvfs_node *clk_ddr_dvfs_node;
  92 static u32 cluster_policy_cpu[RK_MAX_CLUSTERS];
  93 static unsigned int big_little = 1;
  94
  95 /*******************************************************/
  96 static inline int cpu_to_cluster(int cpu)
  97 {
  98         return topology_physical_package_id(cpu);
  99 }
 100
 101 static unsigned int rockchip_bl_cpufreq_get_rate(unsigned int cpu)
 102 {
 103         u32 cur_cluster = cpu_to_cluster(cpu);
 104
 105         if (clk_cpu_dvfs_node[cur_cluster])
 106                 return clk_get_rate(clk_cpu_dvfs_node[cur_cluster]->clk) / 1000;
 107
 108         return 0;
 109 }
 110
 111 static bool cpufreq_is_ondemand(struct cpufreq_policy *policy)
 112 {
 113         char c = 0;
 114
 115         if (policy && policy->governor)
 116                 c = policy->governor->name[0];
 117         return (c == 'o' || c == 'i' || c == 'c' || c == 'h');
 118 }
 119
 120 static unsigned int get_freq_from_table(unsigned int max_freq,
 121                                         unsigned int cluster)
 122 {
 123         unsigned int i;
 124         unsigned int target_freq = 0;
 125
 126         for (i = 0; freq_table[cluster][i].frequency != CPUFREQ_TABLE_END;
 127              i++) {
 128                 unsigned int freq = freq_table[cluster][i].frequency;
 129
 130                 if (freq <= max_freq && target_freq < freq)
 131                         target_freq = freq;
 132         }
 133         if (!target_freq)
 134                 target_freq = max_freq;
 135         return target_freq;
 136 }
 137
 138 static int rockchip_bl_cpufreq_notifier_policy(struct notifier_block *nb,
 139                                                unsigned long val,
 140                                                void *data)
 141 {
 142         static unsigned int min_rate = 0, max_rate = -1;
 143         struct cpufreq_policy *policy = data;
 144         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 145
 146         if (val != CPUFREQ_ADJUST)
 147                 return 0;
 148
 149         if (cpufreq_is_ondemand(policy)) {
 150                 FREQ_DBG("queue work\n");
 151                 dvfs_clk_enable_limit(clk_cpu_dvfs_node[cur_cluster],
 152                                       min_rate, max_rate);
 153         } else {
 154                 FREQ_DBG("cancel work\n");
 155                 dvfs_clk_get_limit(clk_cpu_dvfs_node[cur_cluster],
 156                                    &min_rate, &max_rate);
 157         }
 158
 159         return 0;
 160 }
 161
 162 static struct notifier_block notifier_policy_block = {
 163         .notifier_call = rockchip_bl_cpufreq_notifier_policy
 164 };
 165
 166 static int rockchip_bl_cpufreq_verify(struct cpufreq_policy *policy)
 167 {
 168         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 169
 170         if (!freq_table[cur_cluster])
 171                 return -EINVAL;
 172         return cpufreq_frequency_table_verify(policy, freq_table[cur_cluster]);
 173 }
 174
 175 static int clk_node_get_cluster_id(struct clk *clk)
 176 {
 177         int i;
 178
 179         for (i = 0; i < RK_MAX_CLUSTERS; i++) {
 180                 if (clk_cpu_dvfs_node[i]->clk == clk)
 181                         return i;
 182         }
 183         return 0;
 184 }
 185
 186 static int rockchip_bl_cpufreq_scale_rate_for_dvfs(struct clk *clk,
 187                                                    unsigned long rate)
 188 {
 189         int ret;
 190         struct cpufreq_freqs freqs;
 191         struct cpufreq_policy *policy;
 192         u32 cur_cluster;
 193
 194         cur_cluster = clk_node_get_cluster_id(clk);
 195         policy = cpufreq_cpu_get(cluster_policy_cpu[cur_cluster]);
 196
 197         freqs.new = rate / 1000;
 198         freqs.old = clk_get_rate(clk) / 1000;
 199
 200         cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
 201
 202         FREQ_DBG("cpufreq_scale_rate_for_dvfs(%lu)\n", rate);
 203
 204         ret = clk_set_rate(clk, rate);
 205
 206         freqs.new = clk_get_rate(clk) / 1000;
 207         /* notifiers */
 208         cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
 209
 210         cpufreq_cpu_put(policy);
 211         return ret;
 212 }
 213
 214 static int cluster_cpus_freq_dvfs_init(u32 cluster_id, char *dvfs_name)
 215 {
 216         clk_cpu_dvfs_node[cluster_id] = clk_get_dvfs_node(dvfs_name);
 217
 218         if (!clk_cpu_dvfs_node[cluster_id]) {
 219                 FREQ_ERR("%s:cluster_id=%d,get dvfs err\n",
 220                          __func__, cluster_id);
 221                 return -EINVAL;
 222         }
 223         dvfs_clk_register_set_rate_callback(
 224                 clk_cpu_dvfs_node[cluster_id],
 225                 rockchip_bl_cpufreq_scale_rate_for_dvfs);
 226         freq_table[cluster_id] =
 227                 dvfs_get_freq_volt_table(clk_cpu_dvfs_node[cluster_id]);
 228         if (freq_table[cluster_id] == NULL) {
 229                 freq_table[cluster_id] = default_freq_table;
 230         } else {
 231                 int v = INT_MAX;
 232                 int i;
 233
 234                 for (i = 0; freq_table[cluster_id][i].frequency !=
 235                      CPUFREQ_TABLE_END; i++) {
 236                         if (freq_table[cluster_id][i].index >= suspend_volt &&
 237                             v > freq_table[cluster_id][i].index) {
 238                                 suspend_freq[cluster_id] =
 239                                         freq_table[cluster_id][i].frequency;
 240                                 v = freq_table[cluster_id][i].index;
 241                         }
 242                 }
 243         }
 244         low_battery_freq[cluster_id] =
 245                 get_freq_from_table(low_battery_freq[cluster_id], cluster_id);
 246         clk_enable_dvfs(clk_cpu_dvfs_node[cluster_id]);
 247         return 0;
 248 }
 249
 250 static int rockchip_bl_cpufreq_init_cpu0(struct cpufreq_policy *policy)
 251 {
 252         clk_gpu_dvfs_node = clk_get_dvfs_node("clk_gpu");
 253         if (clk_gpu_dvfs_node)
 254                 clk_enable_dvfs(clk_gpu_dvfs_node);
 255
 256         clk_ddr_dvfs_node = clk_get_dvfs_node("clk_ddr");
 257         if (clk_ddr_dvfs_node)
 258                 clk_enable_dvfs(clk_ddr_dvfs_node);
 259
 260         cluster_cpus_freq_dvfs_init(0, "clk_core_b");
 261         cluster_cpus_freq_dvfs_init(1, "clk_core_l");
 262
 263         cpufreq_register_notifier(&notifier_policy_block,
 264                                   CPUFREQ_POLICY_NOTIFIER);
 265
 266         pr_info("version " VERSION ", suspend freq %d %d MHz\n",
 267                 suspend_freq[0] / 1000, suspend_freq[1] / 1000);
 268         return 0;
 269 }
 270
 271 static int rockchip_bl_cpufreq_init(struct cpufreq_policy *policy)
 272 {
 273         static int cpu0_err;
 274         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 275
 276         if (policy->cpu == 0)
 277                 cpu0_err = rockchip_bl_cpufreq_init_cpu0(policy);
 278         if (cpu0_err)
 279                 return cpu0_err;
 280
 281         cluster_policy_cpu[cur_cluster] = policy->cpu;
 282
 283         /* set freq min max */
 284         cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
 285         /* sys nod */
 286         cpufreq_frequency_table_get_attr(freq_table[cur_cluster], policy->cpu);
 287
 288         if (cur_cluster < RK_MAX_CLUSTERS)
 289                 cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
 290
 291         policy->cur = clk_get_rate(clk_cpu_dvfs_node[cur_cluster]->clk) / 1000;
 292
 293         /* make ondemand default sampling_rate to 40000 */
 294         policy->cpuinfo.transition_latency = 40 * NSEC_PER_USEC;
 295
 296         return 0;
 297 }
 298
 299 static int rockchip_bl_cpufreq_exit(struct cpufreq_policy *policy)
 300 {
 301         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 302
 303         if (policy->cpu == 0) {
 304                 cpufreq_unregister_notifier(&notifier_policy_block,
 305                                             CPUFREQ_POLICY_NOTIFIER);
 306         }
 307         cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
 308         clk_put_dvfs_node(clk_cpu_dvfs_node[cur_cluster]);
 309
 310         return 0;
 311 }
 312
 313 static struct freq_attr *rockchip_bl_cpufreq_attr[] = {
 314         &cpufreq_freq_attr_scaling_available_freqs,
 315         NULL,
 316 };
 317
 318 #ifdef CONFIG_CHARGER_DISPLAY
 319 extern int rk_get_system_battery_capacity(void);
 320 #else
 321 static int rk_get_system_battery_capacity(void)
 322 {
 323         return 100;
 324 }
 325 #endif
 326
 327 static unsigned int
 328 rockchip_bl_cpufreq_scale_limit(unsigned int target_freq,
 329                                 struct cpufreq_policy *policy, bool is_private)
 330 {
 331         bool is_ondemand = cpufreq_is_ondemand(policy);
 332         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 333
 334         if (!is_ondemand)
 335                 return target_freq;
 336
 337         if (is_booting) {
 338                 s64 boottime_ms = ktime_to_ms(ktime_get_boottime());
 339
 340                 if (boottime_ms > 60 * MSEC_PER_SEC) {
 341                         is_booting = false;
 342                 } else if (target_freq > low_battery_freq[cur_cluster] &&
 343                            rk_get_system_battery_capacity() <=
 344                            low_battery_capacity) {
 345                         target_freq = low_battery_freq[cur_cluster];
 346                 }
 347         }
 348
 349         return target_freq;
 350 }
 351
 352 static int rockchip_bl_cpufreq_target(struct cpufreq_policy *policy,
 353                                       unsigned int target_freq,
 354                                       unsigned int relation)
 355 {
 356         unsigned int i, new_freq = target_freq, new_rate, cur_rate;
 357         int ret = 0;
 358         bool is_private;
 359         u32 cur_cluster = cpu_to_cluster(policy->cpu);
 360
 361         if (!freq_table[cur_cluster]) {
 362                 FREQ_ERR("no freq table!\n");
 363                 return -EINVAL;
 364         }
 365
 366         mutex_lock(&cpufreq_mutex);
 367
 368         is_private = relation & CPUFREQ_PRIVATE;
 369         relation &= ~CPUFREQ_PRIVATE;
 370
 371         if ((relation & ENABLE_FURTHER_CPUFREQ) &&
 372             no_cpufreq_access[cur_cluster])
 373                 no_cpufreq_access[cur_cluster]--;
 374         if (no_cpufreq_access[cur_cluster]) {
 375                 FREQ_LOG("denied access to %s as it is disabled temporarily\n",
 376                          __func__);
 377                 ret = -EINVAL;
 378                 goto out;
 379         }
 380         if (relation & DISABLE_FURTHER_CPUFREQ)
 381                 no_cpufreq_access[cur_cluster]++;
 382         relation &= ~MASK_FURTHER_CPUFREQ;
 383
 384         ret = cpufreq_frequency_table_target(policy, freq_table[cur_cluster],
 385                                              target_freq, relation, &i);
 386         if (ret) {
 387                 FREQ_ERR("no freq match for %d(ret=%d)\n", target_freq, ret);
 388                 goto out;
 389         }
 390         new_freq = freq_table[cur_cluster][i].frequency;
 391         if (!no_cpufreq_access[cur_cluster])
 392                 new_freq =
 393                     rockchip_bl_cpufreq_scale_limit(new_freq, policy,
 394                                                     is_private);
 395
 396         new_rate = new_freq * 1000;
 397         cur_rate = dvfs_clk_get_rate(clk_cpu_dvfs_node[cur_cluster]);
 398         FREQ_LOG("req = %7u new = %7u (was = %7u)\n", target_freq,
 399                  new_freq, cur_rate / 1000);
 400         if (new_rate == cur_rate)
 401                 goto out;
 402         ret = dvfs_clk_set_rate(clk_cpu_dvfs_node[cur_cluster], new_rate);
 403
 404 out:
 405         FREQ_DBG("set freq (%7u) end, ret %d\n", new_freq, ret);
 406         mutex_unlock(&cpufreq_mutex);
 407         return ret;
 408 }
 409
 410 static int rockchip_bl_cpufreq_pm_notifier_event(struct notifier_block *this,
 411                                                  unsigned long event, void *ptr)
 412 {
 413         int ret = NOTIFY_DONE;
 414         int i;
 415
 416         for (i = 0; i < RK_MAX_CLUSTERS; i++) {
 417                 struct cpufreq_policy *policy =
 418                         cpufreq_cpu_get(cluster_policy_cpu[i]);
 419
 420                 if (!policy)
 421                         return ret;
 422
 423                 if (!cpufreq_is_ondemand(policy))
 424                         goto out;
 425
 426                 switch (event) {
 427                 case PM_SUSPEND_PREPARE:
 428                         policy->cur++;
 429                         ret = cpufreq_driver_target(policy, suspend_freq[i],
 430                                                     DISABLE_FURTHER_CPUFREQ |
 431                                                     CPUFREQ_RELATION_H);
 432                         if (ret < 0) {
 433                                 ret = NOTIFY_BAD;
 434                                 goto out;
 435                         }
 436                         ret = NOTIFY_OK;
 437                         break;
 438                 case PM_POST_RESTORE:
 439                 case PM_POST_SUSPEND:
 440                         /* if (target_freq == policy->cur) then
 441                            cpufreq_driver_target will return, and
 442                            our target will not be called, it casue
 443                            ENABLE_FURTHER_CPUFREQ flag invalid,
 444                            avoid that. */
 445                         policy->cur++;
 446                         cpufreq_driver_target(policy, suspend_freq[i],
 447                                               ENABLE_FURTHER_CPUFREQ |
 448                                               CPUFREQ_RELATION_H);
 449                         ret = NOTIFY_OK;
 450                         break;
 451                 }
 452 out:
 453                 cpufreq_cpu_put(policy);
 454         }
 455         return ret;
 456 }
 457
 458 static struct notifier_block rockchip_bl_cpufreq_pm_notifier = {
 459         .notifier_call = rockchip_bl_cpufreq_pm_notifier_event,
 460 };
 461
 462 static int rockchip_bl_cpufreq_reboot_limit_freq(void)
 463 {
 464         struct regulator *regulator;
 465         int volt = 0;
 466         u32 rate;
 467         int i;
 468
 469         dvfs_disable_temp_limit();
 470
 471         for (i = 0; i < RK_MAX_CLUSTERS; i++) {
 472                 dvfs_clk_enable_limit(clk_cpu_dvfs_node[i],
 473                                       1000 * suspend_freq[i],
 474                                       1000 * suspend_freq[i]);
 475                 rate = dvfs_clk_get_rate(clk_cpu_dvfs_node[i]);
 476         }
 477
 478         regulator = dvfs_get_regulator("vdd_arm");
 479         if (regulator)
 480                 volt = regulator_get_voltage(regulator);
 481         else
 482                 pr_info("get arm regulator failed\n");
 483         pr_info("reboot set cluster0 rate=%lu, cluster1 rate=%lu, volt=%d\n",
 484                 dvfs_clk_get_rate(clk_cpu_dvfs_node[0]),
 485                 dvfs_clk_get_rate(clk_cpu_dvfs_node[1]), volt);
 486
 487         return 0;
 488 }
 489
 490 static int rockchip_bl_cpufreq_reboot_notifier_event(struct notifier_block
 491                                                      *this, unsigned long event,
 492                                                      void *ptr)
 493 {
 494         rockchip_set_system_status(SYS_STATUS_REBOOT);
 495         rockchip_bl_cpufreq_reboot_limit_freq();
 496
 497         return NOTIFY_OK;
 498 };
 499
 500 static struct notifier_block rockchip_bl_cpufreq_reboot_notifier = {
 501         .notifier_call = rockchip_bl_cpufreq_reboot_notifier_event,
 502 };
 503
 504 static struct cpufreq_driver rockchip_bl_cpufreq_driver = {
 505         .flags = CPUFREQ_CONST_LOOPS,
 506         .verify = rockchip_bl_cpufreq_verify,
 507         .target = rockchip_bl_cpufreq_target,
 508         .get = rockchip_bl_cpufreq_get_rate,
 509         .init = rockchip_bl_cpufreq_init,
 510         .exit = rockchip_bl_cpufreq_exit,
 511         .name = "rockchip-bl",
 512         .have_governor_per_policy = true,
 513         .attr = rockchip_bl_cpufreq_attr,
 514 };
 515
 516 static const struct of_device_id rockchip_bl_cpufreq_match[] = {
 517         {
 518                 .compatible = "rockchip,rk3368-cpufreq",
 519         },
 520         {},
 521 };
 522 MODULE_DEVICE_TABLE(of, rockchip_bl_cpufreq_match);
 523
 524 static int rockchip_bl_cpufreq_probe(struct platform_device *pdev)
 525 {
 526         struct device_node *np;
 527         struct regmap *grf_regmap;
 528         unsigned int big_bits, litt_bits;
 529         int ret;
 530
 531         np = pdev->dev.of_node;
 532         if (!np)
 533                 return -ENODEV;
 534
 535         grf_regmap = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
 536         if (IS_ERR(grf_regmap)) {
 537                 FREQ_ERR("Cpufreq couldn't find grf regmap\n");
 538                 return PTR_ERR(grf_regmap);
 539         }
 540         ret = regmap_read(grf_regmap, RK3368_GRF_CPU_CON(3), &big_bits);
 541         if (ret != 0) {
 542                 FREQ_ERR("Cpufreq couldn't read to GRF\n");
 543                 return -1;
 544         }
 545         ret = regmap_read(grf_regmap, RK3368_GRF_CPU_CON(1), &litt_bits);
 546         if (ret != 0) {
 547                 FREQ_ERR("Cpufreq couldn't read to GRF\n");
 548                 return -1;
 549         }
 550
 551         big_bits = (big_bits >> 8) & 0x03;
 552         litt_bits = (litt_bits >> 8) & 0x03;
 553
 554         if (big_bits == 0x01 && litt_bits == 0x00)
 555                 big_little = 1;
 556         else if (big_bits == 0x0 && litt_bits == 0x01)
 557                 big_little = 0;
 558         pr_info("boot from %d\n", big_little);
 559
 560         register_reboot_notifier(&rockchip_bl_cpufreq_reboot_notifier);
 561         register_pm_notifier(&rockchip_bl_cpufreq_pm_notifier);
 562
 563         return cpufreq_register_driver(&rockchip_bl_cpufreq_driver);
 564 }
 565
 566 static int rockchip_bl_cpufreq_remove(struct platform_device *pdev)
 567 {
 568         cpufreq_unregister_driver(&rockchip_bl_cpufreq_driver);
 569         return 0;
 570 }
 571
 572 static struct platform_driver rockchip_bl_cpufreq_platdrv = {
 573         .driver = {
 574                 .name   = "rockchip-bl-cpufreq",
 575                 .owner  = THIS_MODULE,
 576                 .of_match_table = rockchip_bl_cpufreq_match,
 577         },
 578         .probe          = rockchip_bl_cpufreq_probe,
 579         .remove         = rockchip_bl_cpufreq_remove,
 580 };
 581
 582 module_platform_driver(rockchip_bl_cpufreq_platdrv);
 583
 584 MODULE_AUTHOR("Xiao Feng <xf@rock-chips.com>");
 585 MODULE_LICENSE("GPL");