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 HZ_PER_KHZ 1000 28 29 struct qcom_cpufreq_soc_data { 30 u32 reg_enable; 31 u32 reg_freq_lut; 32 u32 reg_volt_lut; 33 u32 reg_current_vote; 34 u32 reg_perf_state; 35 u8 lut_row_size; 36 }; 37 38 struct qcom_cpufreq_data { 39 void __iomem *base; 40 struct resource *res; 41 const struct qcom_cpufreq_soc_data *soc_data; 42 43 /* 44 * Mutex to synchronize between de-init sequence and re-starting LMh 45 * polling/interrupts 46 */ 47 struct mutex throttle_lock; 48 int throttle_irq; 49 char irq_name[15]; 50 bool cancel_throttle; 51 struct delayed_work throttle_work; 52 struct cpufreq_policy *policy; 53 }; 54 55 static unsigned long cpu_hw_rate, xo_rate; 56 static bool icc_scaling_enabled; 57 58 static int qcom_cpufreq_set_bw(struct cpufreq_policy *policy, 59 unsigned long freq_khz) 60 { 61 unsigned long freq_hz = freq_khz * 1000; 62 struct dev_pm_opp *opp; 63 struct device *dev; 64 int ret; 65 66 dev = get_cpu_device(policy->cpu); 67 if (!dev) 68 return -ENODEV; 69 70 opp = dev_pm_opp_find_freq_exact(dev, freq_hz, true); 71 if (IS_ERR(opp)) 72 return PTR_ERR(opp); 73 74 ret = dev_pm_opp_set_opp(dev, opp); 75 dev_pm_opp_put(opp); 76 return ret; 77 } 78 79 static int qcom_cpufreq_update_opp(struct device *cpu_dev, 80 unsigned long freq_khz, 81 unsigned long volt) 82 { 83 unsigned long freq_hz = freq_khz * 1000; 84 int ret; 85 86 /* Skip voltage update if the opp table is not available */ 87 if (!icc_scaling_enabled) 88 return dev_pm_opp_add(cpu_dev, freq_hz, volt); 89 90 ret = dev_pm_opp_adjust_voltage(cpu_dev, freq_hz, volt, volt, volt); 91 if (ret) { 92 dev_err(cpu_dev, "Voltage update failed freq=%ld\n", freq_khz); 93 return ret; 94 } 95 96 return dev_pm_opp_enable(cpu_dev, freq_hz); 97 } 98 99 static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy, 100 unsigned int index) 101 { 102 struct qcom_cpufreq_data *data = policy->driver_data; 103 const struct qcom_cpufreq_soc_data *soc_data = data->soc_data; 104 unsigned long freq = policy->freq_table[index].frequency; 105 106 writel_relaxed(index, data->base + soc_data->reg_perf_state); 107 108 if (icc_scaling_enabled) 109 qcom_cpufreq_set_bw(policy, freq); 110 111 return 0; 112 } 113 114 static unsigned int qcom_cpufreq_hw_get(unsigned int cpu) 115 { 116 struct qcom_cpufreq_data *data; 117 const struct qcom_cpufreq_soc_data *soc_data; 118 struct cpufreq_policy *policy; 119 unsigned int index; 120 121 policy = cpufreq_cpu_get_raw(cpu); 122 if (!policy) 123 return 0; 124 125 data = policy->driver_data; 126 soc_data = data->soc_data; 127 128 index = readl_relaxed(data->base + soc_data->reg_perf_state); 129 index = min(index, LUT_MAX_ENTRIES - 1); 130 131 return policy->freq_table[index].frequency; 132 } 133 134 static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy, 135 unsigned int target_freq) 136 { 137 struct qcom_cpufreq_data *data = policy->driver_data; 138 const struct qcom_cpufreq_soc_data *soc_data = data->soc_data; 139 unsigned int index; 140 141 index = policy->cached_resolved_idx; 142 writel_relaxed(index, data->base + soc_data->reg_perf_state); 143 144 return policy->freq_table[index].frequency; 145 } 146 147 static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev, 148 struct cpufreq_policy *policy) 149 { 150 u32 data, src, lval, i, core_count, prev_freq = 0, freq; 151 u32 volt; 152 struct cpufreq_frequency_table *table; 153 struct dev_pm_opp *opp; 154 unsigned long rate; 155 int ret; 156 struct qcom_cpufreq_data *drv_data = policy->driver_data; 157 const struct qcom_cpufreq_soc_data *soc_data = drv_data->soc_data; 158 159 table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL); 160 if (!table) 161 return -ENOMEM; 162 163 ret = dev_pm_opp_of_add_table(cpu_dev); 164 if (!ret) { 165 /* Disable all opps and cross-validate against LUT later */ 166 icc_scaling_enabled = true; 167 for (rate = 0; ; rate++) { 168 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate); 169 if (IS_ERR(opp)) 170 break; 171 172 dev_pm_opp_put(opp); 173 dev_pm_opp_disable(cpu_dev, rate); 174 } 175 } else if (ret != -ENODEV) { 176 dev_err(cpu_dev, "Invalid opp table in device tree\n"); 177 return ret; 178 } else { 179 policy->fast_switch_possible = true; 180 icc_scaling_enabled = false; 181 } 182 183 for (i = 0; i < LUT_MAX_ENTRIES; i++) { 184 data = readl_relaxed(drv_data->base + soc_data->reg_freq_lut + 185 i * soc_data->lut_row_size); 186 src = FIELD_GET(LUT_SRC, data); 187 lval = FIELD_GET(LUT_L_VAL, data); 188 core_count = FIELD_GET(LUT_CORE_COUNT, data); 189 190 data = readl_relaxed(drv_data->base + soc_data->reg_volt_lut + 191 i * soc_data->lut_row_size); 192 volt = FIELD_GET(LUT_VOLT, data) * 1000; 193 194 if (src) 195 freq = xo_rate * lval / 1000; 196 else 197 freq = cpu_hw_rate / 1000; 198 199 if (freq != prev_freq && core_count != LUT_TURBO_IND) { 200 if (!qcom_cpufreq_update_opp(cpu_dev, freq, volt)) { 201 table[i].frequency = freq; 202 dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i, 203 freq, core_count); 204 } else { 205 dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", freq); 206 table[i].frequency = CPUFREQ_ENTRY_INVALID; 207 } 208 209 } else if (core_count == LUT_TURBO_IND) { 210 table[i].frequency = CPUFREQ_ENTRY_INVALID; 211 } 212 213 /* 214 * Two of the same frequencies with the same core counts means 215 * end of table 216 */ 217 if (i > 0 && prev_freq == freq) { 218 struct cpufreq_frequency_table *prev = &table[i - 1]; 219 220 /* 221 * Only treat the last frequency that might be a boost 222 * as the boost frequency 223 */ 224 if (prev->frequency == CPUFREQ_ENTRY_INVALID) { 225 if (!qcom_cpufreq_update_opp(cpu_dev, prev_freq, volt)) { 226 prev->frequency = prev_freq; 227 prev->flags = CPUFREQ_BOOST_FREQ; 228 } else { 229 dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", 230 freq); 231 } 232 } 233 234 break; 235 } 236 237 prev_freq = freq; 238 } 239 240 table[i].frequency = CPUFREQ_TABLE_END; 241 policy->freq_table = table; 242 dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus); 243 244 return 0; 245 } 246 247 static void qcom_get_related_cpus(int index, struct cpumask *m) 248 { 249 struct device_node *cpu_np; 250 struct of_phandle_args args; 251 int cpu, ret; 252 253 for_each_possible_cpu(cpu) { 254 cpu_np = of_cpu_device_node_get(cpu); 255 if (!cpu_np) 256 continue; 257 258 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 259 "#freq-domain-cells", 0, 260 &args); 261 of_node_put(cpu_np); 262 if (ret < 0) 263 continue; 264 265 if (index == args.args[0]) 266 cpumask_set_cpu(cpu, m); 267 } 268 } 269 270 static unsigned int qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data) 271 { 272 unsigned int val = readl_relaxed(data->base + data->soc_data->reg_current_vote); 273 274 return (val & 0x3FF) * 19200; 275 } 276 277 static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) 278 { 279 struct cpufreq_policy *policy = data->policy; 280 int cpu = cpumask_first(policy->cpus); 281 struct device *dev = get_cpu_device(cpu); 282 unsigned long freq_hz, throttled_freq; 283 struct dev_pm_opp *opp; 284 unsigned int freq; 285 286 /* 287 * Get the h/w throttled frequency, normalize it using the 288 * registered opp table and use it to calculate thermal pressure. 289 */ 290 freq = qcom_lmh_get_throttle_freq(data); 291 freq_hz = freq * HZ_PER_KHZ; 292 293 opp = dev_pm_opp_find_freq_floor(dev, &freq_hz); 294 if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE) 295 dev_pm_opp_find_freq_ceil(dev, &freq_hz); 296 297 throttled_freq = freq_hz / HZ_PER_KHZ; 298 299 /* Update thermal pressure (the boost frequencies are accepted) */ 300 arch_update_thermal_pressure(policy->related_cpus, throttled_freq); 301 302 /* 303 * In the unlikely case policy is unregistered do not enable 304 * polling or h/w interrupt 305 */ 306 mutex_lock(&data->throttle_lock); 307 if (data->cancel_throttle) 308 goto out; 309 310 /* 311 * If h/w throttled frequency is higher than what cpufreq has requested 312 * for, then stop polling and switch back to interrupt mechanism. 313 */ 314 if (throttled_freq >= qcom_cpufreq_hw_get(cpu)) 315 enable_irq(data->throttle_irq); 316 else 317 mod_delayed_work(system_highpri_wq, &data->throttle_work, 318 msecs_to_jiffies(10)); 319 320 out: 321 mutex_unlock(&data->throttle_lock); 322 } 323 324 static void qcom_lmh_dcvs_poll(struct work_struct *work) 325 { 326 struct qcom_cpufreq_data *data; 327 328 data = container_of(work, struct qcom_cpufreq_data, throttle_work.work); 329 qcom_lmh_dcvs_notify(data); 330 } 331 332 static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data) 333 { 334 struct qcom_cpufreq_data *c_data = data; 335 336 /* Disable interrupt and enable polling */ 337 disable_irq_nosync(c_data->throttle_irq); 338 schedule_delayed_work(&c_data->throttle_work, 0); 339 340 return IRQ_HANDLED; 341 } 342 343 static const struct qcom_cpufreq_soc_data qcom_soc_data = { 344 .reg_enable = 0x0, 345 .reg_freq_lut = 0x110, 346 .reg_volt_lut = 0x114, 347 .reg_current_vote = 0x704, 348 .reg_perf_state = 0x920, 349 .lut_row_size = 32, 350 }; 351 352 static const struct qcom_cpufreq_soc_data epss_soc_data = { 353 .reg_enable = 0x0, 354 .reg_freq_lut = 0x100, 355 .reg_volt_lut = 0x200, 356 .reg_perf_state = 0x320, 357 .lut_row_size = 4, 358 }; 359 360 static const struct of_device_id qcom_cpufreq_hw_match[] = { 361 { .compatible = "qcom,cpufreq-hw", .data = &qcom_soc_data }, 362 { .compatible = "qcom,cpufreq-epss", .data = &epss_soc_data }, 363 {} 364 }; 365 MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); 366 367 static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index) 368 { 369 struct qcom_cpufreq_data *data = policy->driver_data; 370 struct platform_device *pdev = cpufreq_get_driver_data(); 371 int ret; 372 373 /* 374 * Look for LMh interrupt. If no interrupt line is specified / 375 * if there is an error, allow cpufreq to be enabled as usual. 376 */ 377 data->throttle_irq = platform_get_irq_optional(pdev, index); 378 if (data->throttle_irq == -ENXIO) 379 return 0; 380 if (data->throttle_irq < 0) 381 return data->throttle_irq; 382 383 data->cancel_throttle = false; 384 data->policy = policy; 385 386 mutex_init(&data->throttle_lock); 387 INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll); 388 389 snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu); 390 ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq, 391 IRQF_ONESHOT | IRQF_NO_AUTOEN, data->irq_name, data); 392 if (ret) { 393 dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret); 394 return 0; 395 } 396 397 ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus); 398 if (ret) 399 dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n", 400 data->irq_name, data->throttle_irq); 401 402 return 0; 403 } 404 405 static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data) 406 { 407 if (data->throttle_irq <= 0) 408 return; 409 410 mutex_lock(&data->throttle_lock); 411 data->cancel_throttle = true; 412 mutex_unlock(&data->throttle_lock); 413 414 cancel_delayed_work_sync(&data->throttle_work); 415 free_irq(data->throttle_irq, data); 416 } 417 418 static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) 419 { 420 struct platform_device *pdev = cpufreq_get_driver_data(); 421 struct device *dev = &pdev->dev; 422 struct of_phandle_args args; 423 struct device_node *cpu_np; 424 struct device *cpu_dev; 425 struct resource *res; 426 void __iomem *base; 427 struct qcom_cpufreq_data *data; 428 int ret, index; 429 430 cpu_dev = get_cpu_device(policy->cpu); 431 if (!cpu_dev) { 432 pr_err("%s: failed to get cpu%d device\n", __func__, 433 policy->cpu); 434 return -ENODEV; 435 } 436 437 cpu_np = of_cpu_device_node_get(policy->cpu); 438 if (!cpu_np) 439 return -EINVAL; 440 441 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 442 "#freq-domain-cells", 0, &args); 443 of_node_put(cpu_np); 444 if (ret) 445 return ret; 446 447 index = args.args[0]; 448 449 res = platform_get_resource(pdev, IORESOURCE_MEM, index); 450 if (!res) { 451 dev_err(dev, "failed to get mem resource %d\n", index); 452 return -ENODEV; 453 } 454 455 if (!request_mem_region(res->start, resource_size(res), res->name)) { 456 dev_err(dev, "failed to request resource %pR\n", res); 457 return -EBUSY; 458 } 459 460 base = ioremap(res->start, resource_size(res)); 461 if (!base) { 462 dev_err(dev, "failed to map resource %pR\n", res); 463 ret = -ENOMEM; 464 goto release_region; 465 } 466 467 data = kzalloc(sizeof(*data), GFP_KERNEL); 468 if (!data) { 469 ret = -ENOMEM; 470 goto unmap_base; 471 } 472 473 data->soc_data = of_device_get_match_data(&pdev->dev); 474 data->base = base; 475 data->res = res; 476 477 /* HW should be in enabled state to proceed */ 478 if (!(readl_relaxed(base + data->soc_data->reg_enable) & 0x1)) { 479 dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index); 480 ret = -ENODEV; 481 goto error; 482 } 483 484 qcom_get_related_cpus(index, policy->cpus); 485 if (!cpumask_weight(policy->cpus)) { 486 dev_err(dev, "Domain-%d failed to get related CPUs\n", index); 487 ret = -ENOENT; 488 goto error; 489 } 490 491 policy->driver_data = data; 492 policy->dvfs_possible_from_any_cpu = true; 493 494 ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy); 495 if (ret) { 496 dev_err(dev, "Domain-%d failed to read LUT\n", index); 497 goto error; 498 } 499 500 ret = dev_pm_opp_get_opp_count(cpu_dev); 501 if (ret <= 0) { 502 dev_err(cpu_dev, "Failed to add OPPs\n"); 503 ret = -ENODEV; 504 goto error; 505 } 506 507 if (policy_has_boost_freq(policy)) { 508 ret = cpufreq_enable_boost_support(); 509 if (ret) 510 dev_warn(cpu_dev, "failed to enable boost: %d\n", ret); 511 } 512 513 ret = qcom_cpufreq_hw_lmh_init(policy, index); 514 if (ret) 515 goto error; 516 517 return 0; 518 error: 519 kfree(data); 520 unmap_base: 521 iounmap(base); 522 release_region: 523 release_mem_region(res->start, resource_size(res)); 524 return ret; 525 } 526 527 static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy) 528 { 529 struct device *cpu_dev = get_cpu_device(policy->cpu); 530 struct qcom_cpufreq_data *data = policy->driver_data; 531 struct resource *res = data->res; 532 void __iomem *base = data->base; 533 534 dev_pm_opp_remove_all_dynamic(cpu_dev); 535 dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); 536 qcom_cpufreq_hw_lmh_exit(data); 537 kfree(policy->freq_table); 538 kfree(data); 539 iounmap(base); 540 release_mem_region(res->start, resource_size(res)); 541 542 return 0; 543 } 544 545 static void qcom_cpufreq_ready(struct cpufreq_policy *policy) 546 { 547 struct qcom_cpufreq_data *data = policy->driver_data; 548 549 if (data->throttle_irq >= 0) 550 enable_irq(data->throttle_irq); 551 } 552 553 static struct freq_attr *qcom_cpufreq_hw_attr[] = { 554 &cpufreq_freq_attr_scaling_available_freqs, 555 &cpufreq_freq_attr_scaling_boost_freqs, 556 NULL 557 }; 558 559 static struct cpufreq_driver cpufreq_qcom_hw_driver = { 560 .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK | 561 CPUFREQ_HAVE_GOVERNOR_PER_POLICY | 562 CPUFREQ_IS_COOLING_DEV, 563 .verify = cpufreq_generic_frequency_table_verify, 564 .target_index = qcom_cpufreq_hw_target_index, 565 .get = qcom_cpufreq_hw_get, 566 .init = qcom_cpufreq_hw_cpu_init, 567 .exit = qcom_cpufreq_hw_cpu_exit, 568 .register_em = cpufreq_register_em_with_opp, 569 .fast_switch = qcom_cpufreq_hw_fast_switch, 570 .name = "qcom-cpufreq-hw", 571 .attr = qcom_cpufreq_hw_attr, 572 .ready = qcom_cpufreq_ready, 573 }; 574 575 static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev) 576 { 577 struct device *cpu_dev; 578 struct clk *clk; 579 int ret; 580 581 clk = clk_get(&pdev->dev, "xo"); 582 if (IS_ERR(clk)) 583 return PTR_ERR(clk); 584 585 xo_rate = clk_get_rate(clk); 586 clk_put(clk); 587 588 clk = clk_get(&pdev->dev, "alternate"); 589 if (IS_ERR(clk)) 590 return PTR_ERR(clk); 591 592 cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV; 593 clk_put(clk); 594 595 cpufreq_qcom_hw_driver.driver_data = pdev; 596 597 /* Check for optional interconnect paths on CPU0 */ 598 cpu_dev = get_cpu_device(0); 599 if (!cpu_dev) 600 return -EPROBE_DEFER; 601 602 ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL); 603 if (ret) 604 return ret; 605 606 ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver); 607 if (ret) 608 dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n"); 609 else 610 dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n"); 611 612 return ret; 613 } 614 615 static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev) 616 { 617 return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver); 618 } 619 620 static struct platform_driver qcom_cpufreq_hw_driver = { 621 .probe = qcom_cpufreq_hw_driver_probe, 622 .remove = qcom_cpufreq_hw_driver_remove, 623 .driver = { 624 .name = "qcom-cpufreq-hw", 625 .of_match_table = qcom_cpufreq_hw_match, 626 }, 627 }; 628 629 static int __init qcom_cpufreq_hw_init(void) 630 { 631 return platform_driver_register(&qcom_cpufreq_hw_driver); 632 } 633 postcore_initcall(qcom_cpufreq_hw_init); 634 635 static void __exit qcom_cpufreq_hw_exit(void) 636 { 637 platform_driver_unregister(&qcom_cpufreq_hw_driver); 638 } 639 module_exit(qcom_cpufreq_hw_exit); 640 641 MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver"); 642 MODULE_LICENSE("GPL v2"); 643