1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2018, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/bitfield.h> 7 #include <linux/cpufreq.h> 8 #include <linux/init.h> 9 #include <linux/interconnect.h> 10 #include <linux/interrupt.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/of_address.h> 14 #include <linux/of_platform.h> 15 #include <linux/pm_opp.h> 16 #include <linux/slab.h> 17 #include <linux/spinlock.h> 18 19 #define LUT_MAX_ENTRIES 40U 20 #define LUT_SRC GENMASK(31, 30) 21 #define LUT_L_VAL GENMASK(7, 0) 22 #define LUT_CORE_COUNT GENMASK(18, 16) 23 #define LUT_VOLT GENMASK(11, 0) 24 #define CLK_HW_DIV 2 25 #define LUT_TURBO_IND 1 26 27 #define GT_IRQ_STATUS BIT(2) 28 29 #define HZ_PER_KHZ 1000 30 31 struct qcom_cpufreq_soc_data { 32 u32 reg_enable; 33 u32 reg_domain_state; 34 u32 reg_dcvs_ctrl; 35 u32 reg_freq_lut; 36 u32 reg_volt_lut; 37 u32 reg_intr_clr; 38 u32 reg_current_vote; 39 u32 reg_perf_state; 40 u8 lut_row_size; 41 }; 42 43 struct qcom_cpufreq_data { 44 void __iomem *base; 45 struct resource *res; 46 const struct qcom_cpufreq_soc_data *soc_data; 47 48 /* 49 * Mutex to synchronize between de-init sequence and re-starting LMh 50 * polling/interrupts 51 */ 52 struct mutex throttle_lock; 53 int throttle_irq; 54 char irq_name[15]; 55 bool cancel_throttle; 56 struct delayed_work throttle_work; 57 struct cpufreq_policy *policy; 58 59 bool per_core_dcvs; 60 }; 61 62 static unsigned long cpu_hw_rate, xo_rate; 63 static bool icc_scaling_enabled; 64 65 static int qcom_cpufreq_set_bw(struct cpufreq_policy *policy, 66 unsigned long freq_khz) 67 { 68 unsigned long freq_hz = freq_khz * 1000; 69 struct dev_pm_opp *opp; 70 struct device *dev; 71 int ret; 72 73 dev = get_cpu_device(policy->cpu); 74 if (!dev) 75 return -ENODEV; 76 77 opp = dev_pm_opp_find_freq_exact(dev, freq_hz, true); 78 if (IS_ERR(opp)) 79 return PTR_ERR(opp); 80 81 ret = dev_pm_opp_set_opp(dev, opp); 82 dev_pm_opp_put(opp); 83 return ret; 84 } 85 86 static int qcom_cpufreq_update_opp(struct device *cpu_dev, 87 unsigned long freq_khz, 88 unsigned long volt) 89 { 90 unsigned long freq_hz = freq_khz * 1000; 91 int ret; 92 93 /* Skip voltage update if the opp table is not available */ 94 if (!icc_scaling_enabled) 95 return dev_pm_opp_add(cpu_dev, freq_hz, volt); 96 97 ret = dev_pm_opp_adjust_voltage(cpu_dev, freq_hz, volt, volt, volt); 98 if (ret) { 99 dev_err(cpu_dev, "Voltage update failed freq=%ld\n", freq_khz); 100 return ret; 101 } 102 103 return dev_pm_opp_enable(cpu_dev, freq_hz); 104 } 105 106 static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy, 107 unsigned int index) 108 { 109 struct qcom_cpufreq_data *data = policy->driver_data; 110 const struct qcom_cpufreq_soc_data *soc_data = data->soc_data; 111 unsigned long freq = policy->freq_table[index].frequency; 112 unsigned int i; 113 114 writel_relaxed(index, data->base + soc_data->reg_perf_state); 115 116 if (data->per_core_dcvs) 117 for (i = 1; i < cpumask_weight(policy->related_cpus); i++) 118 writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4); 119 120 if (icc_scaling_enabled) 121 qcom_cpufreq_set_bw(policy, freq); 122 123 return 0; 124 } 125 126 static unsigned int qcom_cpufreq_hw_get(unsigned int cpu) 127 { 128 struct qcom_cpufreq_data *data; 129 const struct qcom_cpufreq_soc_data *soc_data; 130 struct cpufreq_policy *policy; 131 unsigned int index; 132 133 policy = cpufreq_cpu_get_raw(cpu); 134 if (!policy) 135 return 0; 136 137 data = policy->driver_data; 138 soc_data = data->soc_data; 139 140 index = readl_relaxed(data->base + soc_data->reg_perf_state); 141 index = min(index, LUT_MAX_ENTRIES - 1); 142 143 return policy->freq_table[index].frequency; 144 } 145 146 static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy, 147 unsigned int target_freq) 148 { 149 struct qcom_cpufreq_data *data = policy->driver_data; 150 const struct qcom_cpufreq_soc_data *soc_data = data->soc_data; 151 unsigned int index; 152 unsigned int i; 153 154 index = policy->cached_resolved_idx; 155 writel_relaxed(index, data->base + soc_data->reg_perf_state); 156 157 if (data->per_core_dcvs) 158 for (i = 1; i < cpumask_weight(policy->related_cpus); i++) 159 writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4); 160 161 return policy->freq_table[index].frequency; 162 } 163 164 static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev, 165 struct cpufreq_policy *policy) 166 { 167 u32 data, src, lval, i, core_count, prev_freq = 0, freq; 168 u32 volt; 169 struct cpufreq_frequency_table *table; 170 struct dev_pm_opp *opp; 171 unsigned long rate; 172 int ret; 173 struct qcom_cpufreq_data *drv_data = policy->driver_data; 174 const struct qcom_cpufreq_soc_data *soc_data = drv_data->soc_data; 175 176 table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL); 177 if (!table) 178 return -ENOMEM; 179 180 ret = dev_pm_opp_of_add_table(cpu_dev); 181 if (!ret) { 182 /* Disable all opps and cross-validate against LUT later */ 183 icc_scaling_enabled = true; 184 for (rate = 0; ; rate++) { 185 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate); 186 if (IS_ERR(opp)) 187 break; 188 189 dev_pm_opp_put(opp); 190 dev_pm_opp_disable(cpu_dev, rate); 191 } 192 } else if (ret != -ENODEV) { 193 dev_err(cpu_dev, "Invalid opp table in device tree\n"); 194 return ret; 195 } else { 196 policy->fast_switch_possible = true; 197 icc_scaling_enabled = false; 198 } 199 200 for (i = 0; i < LUT_MAX_ENTRIES; i++) { 201 data = readl_relaxed(drv_data->base + soc_data->reg_freq_lut + 202 i * soc_data->lut_row_size); 203 src = FIELD_GET(LUT_SRC, data); 204 lval = FIELD_GET(LUT_L_VAL, data); 205 core_count = FIELD_GET(LUT_CORE_COUNT, data); 206 207 data = readl_relaxed(drv_data->base + soc_data->reg_volt_lut + 208 i * soc_data->lut_row_size); 209 volt = FIELD_GET(LUT_VOLT, data) * 1000; 210 211 if (src) 212 freq = xo_rate * lval / 1000; 213 else 214 freq = cpu_hw_rate / 1000; 215 216 if (freq != prev_freq && core_count != LUT_TURBO_IND) { 217 if (!qcom_cpufreq_update_opp(cpu_dev, freq, volt)) { 218 table[i].frequency = freq; 219 dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i, 220 freq, core_count); 221 } else { 222 dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", freq); 223 table[i].frequency = CPUFREQ_ENTRY_INVALID; 224 } 225 226 } else if (core_count == LUT_TURBO_IND) { 227 table[i].frequency = CPUFREQ_ENTRY_INVALID; 228 } 229 230 /* 231 * Two of the same frequencies with the same core counts means 232 * end of table 233 */ 234 if (i > 0 && prev_freq == freq) { 235 struct cpufreq_frequency_table *prev = &table[i - 1]; 236 237 /* 238 * Only treat the last frequency that might be a boost 239 * as the boost frequency 240 */ 241 if (prev->frequency == CPUFREQ_ENTRY_INVALID) { 242 if (!qcom_cpufreq_update_opp(cpu_dev, prev_freq, volt)) { 243 prev->frequency = prev_freq; 244 prev->flags = CPUFREQ_BOOST_FREQ; 245 } else { 246 dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", 247 freq); 248 } 249 } 250 251 break; 252 } 253 254 prev_freq = freq; 255 } 256 257 table[i].frequency = CPUFREQ_TABLE_END; 258 policy->freq_table = table; 259 dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus); 260 261 return 0; 262 } 263 264 static void qcom_get_related_cpus(int index, struct cpumask *m) 265 { 266 struct device_node *cpu_np; 267 struct of_phandle_args args; 268 int cpu, ret; 269 270 for_each_possible_cpu(cpu) { 271 cpu_np = of_cpu_device_node_get(cpu); 272 if (!cpu_np) 273 continue; 274 275 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 276 "#freq-domain-cells", 0, 277 &args); 278 of_node_put(cpu_np); 279 if (ret < 0) 280 continue; 281 282 if (index == args.args[0]) 283 cpumask_set_cpu(cpu, m); 284 } 285 } 286 287 static unsigned long qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data) 288 { 289 unsigned int lval; 290 291 if (data->soc_data->reg_current_vote) 292 lval = readl_relaxed(data->base + data->soc_data->reg_current_vote) & 0x3ff; 293 else 294 lval = readl_relaxed(data->base + data->soc_data->reg_domain_state) & 0xff; 295 296 return lval * xo_rate; 297 } 298 299 static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) 300 { 301 struct cpufreq_policy *policy = data->policy; 302 int cpu = cpumask_first(policy->related_cpus); 303 struct device *dev = get_cpu_device(cpu); 304 unsigned long freq_hz, throttled_freq; 305 struct dev_pm_opp *opp; 306 307 /* 308 * Get the h/w throttled frequency, normalize it using the 309 * registered opp table and use it to calculate thermal pressure. 310 */ 311 freq_hz = qcom_lmh_get_throttle_freq(data); 312 313 opp = dev_pm_opp_find_freq_floor(dev, &freq_hz); 314 if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE) 315 opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz); 316 317 if (IS_ERR(opp)) { 318 dev_warn(dev, "Can't find the OPP for throttling: %pe!\n", opp); 319 } else { 320 throttled_freq = freq_hz / HZ_PER_KHZ; 321 322 /* Update thermal pressure (the boost frequencies are accepted) */ 323 arch_update_thermal_pressure(policy->related_cpus, throttled_freq); 324 325 dev_pm_opp_put(opp); 326 } 327 328 /* 329 * In the unlikely case policy is unregistered do not enable 330 * polling or h/w interrupt 331 */ 332 mutex_lock(&data->throttle_lock); 333 if (data->cancel_throttle) 334 goto out; 335 336 /* 337 * If h/w throttled frequency is higher than what cpufreq has requested 338 * for, then stop polling and switch back to interrupt mechanism. 339 */ 340 if (throttled_freq >= qcom_cpufreq_hw_get(cpu)) 341 enable_irq(data->throttle_irq); 342 else 343 mod_delayed_work(system_highpri_wq, &data->throttle_work, 344 msecs_to_jiffies(10)); 345 346 out: 347 mutex_unlock(&data->throttle_lock); 348 } 349 350 static void qcom_lmh_dcvs_poll(struct work_struct *work) 351 { 352 struct qcom_cpufreq_data *data; 353 354 data = container_of(work, struct qcom_cpufreq_data, throttle_work.work); 355 qcom_lmh_dcvs_notify(data); 356 } 357 358 static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data) 359 { 360 struct qcom_cpufreq_data *c_data = data; 361 362 /* Disable interrupt and enable polling */ 363 disable_irq_nosync(c_data->throttle_irq); 364 schedule_delayed_work(&c_data->throttle_work, 0); 365 366 if (c_data->soc_data->reg_intr_clr) 367 writel_relaxed(GT_IRQ_STATUS, 368 c_data->base + c_data->soc_data->reg_intr_clr); 369 370 return IRQ_HANDLED; 371 } 372 373 static const struct qcom_cpufreq_soc_data qcom_soc_data = { 374 .reg_enable = 0x0, 375 .reg_dcvs_ctrl = 0xbc, 376 .reg_freq_lut = 0x110, 377 .reg_volt_lut = 0x114, 378 .reg_current_vote = 0x704, 379 .reg_perf_state = 0x920, 380 .lut_row_size = 32, 381 }; 382 383 static const struct qcom_cpufreq_soc_data epss_soc_data = { 384 .reg_enable = 0x0, 385 .reg_domain_state = 0x20, 386 .reg_dcvs_ctrl = 0xb0, 387 .reg_freq_lut = 0x100, 388 .reg_volt_lut = 0x200, 389 .reg_intr_clr = 0x308, 390 .reg_perf_state = 0x320, 391 .lut_row_size = 4, 392 }; 393 394 static const struct of_device_id qcom_cpufreq_hw_match[] = { 395 { .compatible = "qcom,cpufreq-hw", .data = &qcom_soc_data }, 396 { .compatible = "qcom,cpufreq-epss", .data = &epss_soc_data }, 397 {} 398 }; 399 MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); 400 401 static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index) 402 { 403 struct qcom_cpufreq_data *data = policy->driver_data; 404 struct platform_device *pdev = cpufreq_get_driver_data(); 405 int ret; 406 407 /* 408 * Look for LMh interrupt. If no interrupt line is specified / 409 * if there is an error, allow cpufreq to be enabled as usual. 410 */ 411 data->throttle_irq = platform_get_irq_optional(pdev, index); 412 if (data->throttle_irq == -ENXIO) 413 return 0; 414 if (data->throttle_irq < 0) 415 return data->throttle_irq; 416 417 data->cancel_throttle = false; 418 data->policy = policy; 419 420 mutex_init(&data->throttle_lock); 421 INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll); 422 423 snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu); 424 ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq, 425 IRQF_ONESHOT | IRQF_NO_AUTOEN, data->irq_name, data); 426 if (ret) { 427 dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret); 428 return 0; 429 } 430 431 ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus); 432 if (ret) 433 dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n", 434 data->irq_name, data->throttle_irq); 435 436 return 0; 437 } 438 439 static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy) 440 { 441 struct qcom_cpufreq_data *data = policy->driver_data; 442 struct platform_device *pdev = cpufreq_get_driver_data(); 443 int ret; 444 445 if (data->throttle_irq <= 0) 446 return 0; 447 448 ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus); 449 if (ret) 450 dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n", 451 data->irq_name, data->throttle_irq); 452 453 return ret; 454 } 455 456 static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy) 457 { 458 struct qcom_cpufreq_data *data = policy->driver_data; 459 460 if (data->throttle_irq <= 0) 461 return 0; 462 463 mutex_lock(&data->throttle_lock); 464 data->cancel_throttle = true; 465 mutex_unlock(&data->throttle_lock); 466 467 cancel_delayed_work_sync(&data->throttle_work); 468 irq_set_affinity_hint(data->throttle_irq, NULL); 469 470 return 0; 471 } 472 473 static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data) 474 { 475 if (data->throttle_irq <= 0) 476 return; 477 478 free_irq(data->throttle_irq, data); 479 } 480 481 static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) 482 { 483 struct platform_device *pdev = cpufreq_get_driver_data(); 484 struct device *dev = &pdev->dev; 485 struct of_phandle_args args; 486 struct device_node *cpu_np; 487 struct device *cpu_dev; 488 struct resource *res; 489 void __iomem *base; 490 struct qcom_cpufreq_data *data; 491 int ret, index; 492 493 cpu_dev = get_cpu_device(policy->cpu); 494 if (!cpu_dev) { 495 pr_err("%s: failed to get cpu%d device\n", __func__, 496 policy->cpu); 497 return -ENODEV; 498 } 499 500 cpu_np = of_cpu_device_node_get(policy->cpu); 501 if (!cpu_np) 502 return -EINVAL; 503 504 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 505 "#freq-domain-cells", 0, &args); 506 of_node_put(cpu_np); 507 if (ret) 508 return ret; 509 510 index = args.args[0]; 511 512 res = platform_get_resource(pdev, IORESOURCE_MEM, index); 513 if (!res) { 514 dev_err(dev, "failed to get mem resource %d\n", index); 515 return -ENODEV; 516 } 517 518 if (!request_mem_region(res->start, resource_size(res), res->name)) { 519 dev_err(dev, "failed to request resource %pR\n", res); 520 return -EBUSY; 521 } 522 523 base = ioremap(res->start, resource_size(res)); 524 if (!base) { 525 dev_err(dev, "failed to map resource %pR\n", res); 526 ret = -ENOMEM; 527 goto release_region; 528 } 529 530 data = kzalloc(sizeof(*data), GFP_KERNEL); 531 if (!data) { 532 ret = -ENOMEM; 533 goto unmap_base; 534 } 535 536 data->soc_data = of_device_get_match_data(&pdev->dev); 537 data->base = base; 538 data->res = res; 539 540 /* HW should be in enabled state to proceed */ 541 if (!(readl_relaxed(base + data->soc_data->reg_enable) & 0x1)) { 542 dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index); 543 ret = -ENODEV; 544 goto error; 545 } 546 547 if (readl_relaxed(base + data->soc_data->reg_dcvs_ctrl) & 0x1) 548 data->per_core_dcvs = true; 549 550 qcom_get_related_cpus(index, policy->cpus); 551 if (cpumask_empty(policy->cpus)) { 552 dev_err(dev, "Domain-%d failed to get related CPUs\n", index); 553 ret = -ENOENT; 554 goto error; 555 } 556 557 policy->driver_data = data; 558 policy->dvfs_possible_from_any_cpu = true; 559 560 ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy); 561 if (ret) { 562 dev_err(dev, "Domain-%d failed to read LUT\n", index); 563 goto error; 564 } 565 566 ret = dev_pm_opp_get_opp_count(cpu_dev); 567 if (ret <= 0) { 568 dev_err(cpu_dev, "Failed to add OPPs\n"); 569 ret = -ENODEV; 570 goto error; 571 } 572 573 if (policy_has_boost_freq(policy)) { 574 ret = cpufreq_enable_boost_support(); 575 if (ret) 576 dev_warn(cpu_dev, "failed to enable boost: %d\n", ret); 577 } 578 579 ret = qcom_cpufreq_hw_lmh_init(policy, index); 580 if (ret) 581 goto error; 582 583 return 0; 584 error: 585 kfree(data); 586 unmap_base: 587 iounmap(base); 588 release_region: 589 release_mem_region(res->start, resource_size(res)); 590 return ret; 591 } 592 593 static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy) 594 { 595 struct device *cpu_dev = get_cpu_device(policy->cpu); 596 struct qcom_cpufreq_data *data = policy->driver_data; 597 struct resource *res = data->res; 598 void __iomem *base = data->base; 599 600 dev_pm_opp_remove_all_dynamic(cpu_dev); 601 dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); 602 qcom_cpufreq_hw_lmh_exit(data); 603 kfree(policy->freq_table); 604 kfree(data); 605 iounmap(base); 606 release_mem_region(res->start, resource_size(res)); 607 608 return 0; 609 } 610 611 static void qcom_cpufreq_ready(struct cpufreq_policy *policy) 612 { 613 struct qcom_cpufreq_data *data = policy->driver_data; 614 615 if (data->throttle_irq >= 0) 616 enable_irq(data->throttle_irq); 617 } 618 619 static struct freq_attr *qcom_cpufreq_hw_attr[] = { 620 &cpufreq_freq_attr_scaling_available_freqs, 621 &cpufreq_freq_attr_scaling_boost_freqs, 622 NULL 623 }; 624 625 static struct cpufreq_driver cpufreq_qcom_hw_driver = { 626 .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK | 627 CPUFREQ_HAVE_GOVERNOR_PER_POLICY | 628 CPUFREQ_IS_COOLING_DEV, 629 .verify = cpufreq_generic_frequency_table_verify, 630 .target_index = qcom_cpufreq_hw_target_index, 631 .get = qcom_cpufreq_hw_get, 632 .init = qcom_cpufreq_hw_cpu_init, 633 .exit = qcom_cpufreq_hw_cpu_exit, 634 .online = qcom_cpufreq_hw_cpu_online, 635 .offline = qcom_cpufreq_hw_cpu_offline, 636 .register_em = cpufreq_register_em_with_opp, 637 .fast_switch = qcom_cpufreq_hw_fast_switch, 638 .name = "qcom-cpufreq-hw", 639 .attr = qcom_cpufreq_hw_attr, 640 .ready = qcom_cpufreq_ready, 641 }; 642 643 static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev) 644 { 645 struct device *cpu_dev; 646 struct clk *clk; 647 int ret; 648 649 clk = clk_get(&pdev->dev, "xo"); 650 if (IS_ERR(clk)) 651 return PTR_ERR(clk); 652 653 xo_rate = clk_get_rate(clk); 654 clk_put(clk); 655 656 clk = clk_get(&pdev->dev, "alternate"); 657 if (IS_ERR(clk)) 658 return PTR_ERR(clk); 659 660 cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV; 661 clk_put(clk); 662 663 cpufreq_qcom_hw_driver.driver_data = pdev; 664 665 /* Check for optional interconnect paths on CPU0 */ 666 cpu_dev = get_cpu_device(0); 667 if (!cpu_dev) 668 return -EPROBE_DEFER; 669 670 ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL); 671 if (ret) 672 return ret; 673 674 ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver); 675 if (ret) 676 dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n"); 677 else 678 dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n"); 679 680 return ret; 681 } 682 683 static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev) 684 { 685 return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver); 686 } 687 688 static struct platform_driver qcom_cpufreq_hw_driver = { 689 .probe = qcom_cpufreq_hw_driver_probe, 690 .remove = qcom_cpufreq_hw_driver_remove, 691 .driver = { 692 .name = "qcom-cpufreq-hw", 693 .of_match_table = qcom_cpufreq_hw_match, 694 }, 695 }; 696 697 static int __init qcom_cpufreq_hw_init(void) 698 { 699 return platform_driver_register(&qcom_cpufreq_hw_driver); 700 } 701 postcore_initcall(qcom_cpufreq_hw_init); 702 703 static void __exit qcom_cpufreq_hw_exit(void) 704 { 705 platform_driver_unregister(&qcom_cpufreq_hw_driver); 706 } 707 module_exit(qcom_cpufreq_hw_exit); 708 709 MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver"); 710 MODULE_LICENSE("GPL v2"); 711