1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Universal Flash Storage Host controller PCI glue driver 4 * 5 * Copyright (C) 2011-2013 Samsung India Software Operations 6 * 7 * Authors: 8 * Santosh Yaraganavi <santosh.sy@samsung.com> 9 * Vinayak Holikatti <h.vinayak@samsung.com> 10 */ 11 12 #include <ufs/ufshcd.h> 13 #include <linux/delay.h> 14 #include <linux/module.h> 15 #include <linux/pci.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/pm_qos.h> 18 #include <linux/debugfs.h> 19 #include <linux/uuid.h> 20 #include <linux/acpi.h> 21 #include <linux/gpio/consumer.h> 22 23 struct ufs_host { 24 void (*late_init)(struct ufs_hba *hba); 25 }; 26 27 enum intel_ufs_dsm_func_id { 28 INTEL_DSM_FNS = 0, 29 INTEL_DSM_RESET = 1, 30 }; 31 32 struct intel_host { 33 struct ufs_host ufs_host; 34 u32 dsm_fns; 35 u32 active_ltr; 36 u32 idle_ltr; 37 struct dentry *debugfs_root; 38 struct gpio_desc *reset_gpio; 39 }; 40 41 static const guid_t intel_dsm_guid = 42 GUID_INIT(0x1A4832A0, 0x7D03, 0x43CA, 43 0xB0, 0x20, 0xF6, 0xDC, 0xD1, 0x2A, 0x19, 0x50); 44 45 static bool __intel_dsm_supported(struct intel_host *host, 46 enum intel_ufs_dsm_func_id fn) 47 { 48 return fn < 32 && fn >= 0 && (host->dsm_fns & (1u << fn)); 49 } 50 51 #define INTEL_DSM_SUPPORTED(host, name) \ 52 __intel_dsm_supported(host, INTEL_DSM_##name) 53 54 static int __intel_dsm(struct intel_host *intel_host, struct device *dev, 55 unsigned int fn, u32 *result) 56 { 57 union acpi_object *obj; 58 int err = 0; 59 size_t len; 60 61 obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &intel_dsm_guid, 0, fn, NULL); 62 if (!obj) 63 return -EOPNOTSUPP; 64 65 if (obj->type != ACPI_TYPE_BUFFER || obj->buffer.length < 1) { 66 err = -EINVAL; 67 goto out; 68 } 69 70 len = min_t(size_t, obj->buffer.length, 4); 71 72 *result = 0; 73 memcpy(result, obj->buffer.pointer, len); 74 out: 75 ACPI_FREE(obj); 76 77 return err; 78 } 79 80 static int intel_dsm(struct intel_host *intel_host, struct device *dev, 81 unsigned int fn, u32 *result) 82 { 83 if (!__intel_dsm_supported(intel_host, fn)) 84 return -EOPNOTSUPP; 85 86 return __intel_dsm(intel_host, dev, fn, result); 87 } 88 89 static void intel_dsm_init(struct intel_host *intel_host, struct device *dev) 90 { 91 int err; 92 93 err = __intel_dsm(intel_host, dev, INTEL_DSM_FNS, &intel_host->dsm_fns); 94 dev_dbg(dev, "DSM fns %#x, error %d\n", intel_host->dsm_fns, err); 95 } 96 97 static int ufs_intel_hce_enable_notify(struct ufs_hba *hba, 98 enum ufs_notify_change_status status) 99 { 100 /* Cannot enable ICE until after HC enable */ 101 if (status == POST_CHANGE && hba->caps & UFSHCD_CAP_CRYPTO) { 102 u32 hce = ufshcd_readl(hba, REG_CONTROLLER_ENABLE); 103 104 hce |= CRYPTO_GENERAL_ENABLE; 105 ufshcd_writel(hba, hce, REG_CONTROLLER_ENABLE); 106 } 107 108 return 0; 109 } 110 111 static int ufs_intel_disable_lcc(struct ufs_hba *hba) 112 { 113 u32 attr = UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE); 114 u32 lcc_enable = 0; 115 116 ufshcd_dme_get(hba, attr, &lcc_enable); 117 if (lcc_enable) 118 ufshcd_disable_host_tx_lcc(hba); 119 120 return 0; 121 } 122 123 static int ufs_intel_link_startup_notify(struct ufs_hba *hba, 124 enum ufs_notify_change_status status) 125 { 126 int err = 0; 127 128 switch (status) { 129 case PRE_CHANGE: 130 err = ufs_intel_disable_lcc(hba); 131 break; 132 case POST_CHANGE: 133 break; 134 default: 135 break; 136 } 137 138 return err; 139 } 140 141 static int ufs_intel_set_lanes(struct ufs_hba *hba, u32 lanes) 142 { 143 struct ufs_pa_layer_attr pwr_info = hba->pwr_info; 144 int ret; 145 146 pwr_info.lane_rx = lanes; 147 pwr_info.lane_tx = lanes; 148 ret = ufshcd_config_pwr_mode(hba, &pwr_info); 149 if (ret) 150 dev_err(hba->dev, "%s: Setting %u lanes, err = %d\n", 151 __func__, lanes, ret); 152 return ret; 153 } 154 155 static int ufs_intel_lkf_pwr_change_notify(struct ufs_hba *hba, 156 enum ufs_notify_change_status status, 157 struct ufs_pa_layer_attr *dev_max_params, 158 struct ufs_pa_layer_attr *dev_req_params) 159 { 160 int err = 0; 161 162 switch (status) { 163 case PRE_CHANGE: 164 if (ufshcd_is_hs_mode(dev_max_params) && 165 (hba->pwr_info.lane_rx != 2 || hba->pwr_info.lane_tx != 2)) 166 ufs_intel_set_lanes(hba, 2); 167 memcpy(dev_req_params, dev_max_params, sizeof(*dev_req_params)); 168 break; 169 case POST_CHANGE: 170 if (ufshcd_is_hs_mode(dev_req_params)) { 171 u32 peer_granularity; 172 173 usleep_range(1000, 1250); 174 err = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY), 175 &peer_granularity); 176 } 177 break; 178 default: 179 break; 180 } 181 182 return err; 183 } 184 185 static int ufs_intel_lkf_apply_dev_quirks(struct ufs_hba *hba) 186 { 187 u32 granularity, peer_granularity; 188 u32 pa_tactivate, peer_pa_tactivate; 189 int ret; 190 191 ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_GRANULARITY), &granularity); 192 if (ret) 193 goto out; 194 195 ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY), &peer_granularity); 196 if (ret) 197 goto out; 198 199 ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &pa_tactivate); 200 if (ret) 201 goto out; 202 203 ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &peer_pa_tactivate); 204 if (ret) 205 goto out; 206 207 if (granularity == peer_granularity) { 208 u32 new_peer_pa_tactivate = pa_tactivate + 2; 209 210 ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(PA_TACTIVATE), new_peer_pa_tactivate); 211 } 212 out: 213 return ret; 214 } 215 216 #define INTEL_ACTIVELTR 0x804 217 #define INTEL_IDLELTR 0x808 218 219 #define INTEL_LTR_REQ BIT(15) 220 #define INTEL_LTR_SCALE_MASK GENMASK(11, 10) 221 #define INTEL_LTR_SCALE_1US (2 << 10) 222 #define INTEL_LTR_SCALE_32US (3 << 10) 223 #define INTEL_LTR_VALUE_MASK GENMASK(9, 0) 224 225 static void intel_cache_ltr(struct ufs_hba *hba) 226 { 227 struct intel_host *host = ufshcd_get_variant(hba); 228 229 host->active_ltr = readl(hba->mmio_base + INTEL_ACTIVELTR); 230 host->idle_ltr = readl(hba->mmio_base + INTEL_IDLELTR); 231 } 232 233 static void intel_ltr_set(struct device *dev, s32 val) 234 { 235 struct ufs_hba *hba = dev_get_drvdata(dev); 236 struct intel_host *host = ufshcd_get_variant(hba); 237 u32 ltr; 238 239 pm_runtime_get_sync(dev); 240 241 /* 242 * Program latency tolerance (LTR) accordingly what has been asked 243 * by the PM QoS layer or disable it in case we were passed 244 * negative value or PM_QOS_LATENCY_ANY. 245 */ 246 ltr = readl(hba->mmio_base + INTEL_ACTIVELTR); 247 248 if (val == PM_QOS_LATENCY_ANY || val < 0) { 249 ltr &= ~INTEL_LTR_REQ; 250 } else { 251 ltr |= INTEL_LTR_REQ; 252 ltr &= ~INTEL_LTR_SCALE_MASK; 253 ltr &= ~INTEL_LTR_VALUE_MASK; 254 255 if (val > INTEL_LTR_VALUE_MASK) { 256 val >>= 5; 257 if (val > INTEL_LTR_VALUE_MASK) 258 val = INTEL_LTR_VALUE_MASK; 259 ltr |= INTEL_LTR_SCALE_32US | val; 260 } else { 261 ltr |= INTEL_LTR_SCALE_1US | val; 262 } 263 } 264 265 if (ltr == host->active_ltr) 266 goto out; 267 268 writel(ltr, hba->mmio_base + INTEL_ACTIVELTR); 269 writel(ltr, hba->mmio_base + INTEL_IDLELTR); 270 271 /* Cache the values into intel_host structure */ 272 intel_cache_ltr(hba); 273 out: 274 pm_runtime_put(dev); 275 } 276 277 static void intel_ltr_expose(struct device *dev) 278 { 279 dev->power.set_latency_tolerance = intel_ltr_set; 280 dev_pm_qos_expose_latency_tolerance(dev); 281 } 282 283 static void intel_ltr_hide(struct device *dev) 284 { 285 dev_pm_qos_hide_latency_tolerance(dev); 286 dev->power.set_latency_tolerance = NULL; 287 } 288 289 static void intel_add_debugfs(struct ufs_hba *hba) 290 { 291 struct dentry *dir = debugfs_create_dir(dev_name(hba->dev), NULL); 292 struct intel_host *host = ufshcd_get_variant(hba); 293 294 intel_cache_ltr(hba); 295 296 host->debugfs_root = dir; 297 debugfs_create_x32("active_ltr", 0444, dir, &host->active_ltr); 298 debugfs_create_x32("idle_ltr", 0444, dir, &host->idle_ltr); 299 } 300 301 static void intel_remove_debugfs(struct ufs_hba *hba) 302 { 303 struct intel_host *host = ufshcd_get_variant(hba); 304 305 debugfs_remove_recursive(host->debugfs_root); 306 } 307 308 static int ufs_intel_device_reset(struct ufs_hba *hba) 309 { 310 struct intel_host *host = ufshcd_get_variant(hba); 311 312 if (INTEL_DSM_SUPPORTED(host, RESET)) { 313 u32 result = 0; 314 int err; 315 316 err = intel_dsm(host, hba->dev, INTEL_DSM_RESET, &result); 317 if (!err && !result) 318 err = -EIO; 319 if (err) 320 dev_err(hba->dev, "%s: DSM error %d result %u\n", 321 __func__, err, result); 322 return err; 323 } 324 325 if (!host->reset_gpio) 326 return -EOPNOTSUPP; 327 328 gpiod_set_value_cansleep(host->reset_gpio, 1); 329 usleep_range(10, 15); 330 331 gpiod_set_value_cansleep(host->reset_gpio, 0); 332 usleep_range(10, 15); 333 334 return 0; 335 } 336 337 static struct gpio_desc *ufs_intel_get_reset_gpio(struct device *dev) 338 { 339 /* GPIO in _DSD has active low setting */ 340 return devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 341 } 342 343 static int ufs_intel_common_init(struct ufs_hba *hba) 344 { 345 struct intel_host *host; 346 347 hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND; 348 349 host = devm_kzalloc(hba->dev, sizeof(*host), GFP_KERNEL); 350 if (!host) 351 return -ENOMEM; 352 ufshcd_set_variant(hba, host); 353 intel_dsm_init(host, hba->dev); 354 if (INTEL_DSM_SUPPORTED(host, RESET)) { 355 if (hba->vops->device_reset) 356 hba->caps |= UFSHCD_CAP_DEEPSLEEP; 357 } else { 358 if (hba->vops->device_reset) 359 host->reset_gpio = ufs_intel_get_reset_gpio(hba->dev); 360 if (IS_ERR(host->reset_gpio)) { 361 dev_err(hba->dev, "%s: failed to get reset GPIO, error %ld\n", 362 __func__, PTR_ERR(host->reset_gpio)); 363 host->reset_gpio = NULL; 364 } 365 if (host->reset_gpio) { 366 gpiod_set_value_cansleep(host->reset_gpio, 0); 367 hba->caps |= UFSHCD_CAP_DEEPSLEEP; 368 } 369 } 370 intel_ltr_expose(hba->dev); 371 intel_add_debugfs(hba); 372 return 0; 373 } 374 375 static void ufs_intel_common_exit(struct ufs_hba *hba) 376 { 377 intel_remove_debugfs(hba); 378 intel_ltr_hide(hba->dev); 379 } 380 381 static int ufs_intel_resume(struct ufs_hba *hba, enum ufs_pm_op op) 382 { 383 if (ufshcd_is_link_hibern8(hba)) { 384 int ret = ufshcd_uic_hibern8_exit(hba); 385 386 if (!ret) { 387 ufshcd_set_link_active(hba); 388 } else { 389 dev_err(hba->dev, "%s: hibern8 exit failed %d\n", 390 __func__, ret); 391 /* 392 * Force reset and restore. Any other actions can lead 393 * to an unrecoverable state. 394 */ 395 ufshcd_set_link_off(hba); 396 } 397 } 398 399 return 0; 400 } 401 402 static int ufs_intel_ehl_init(struct ufs_hba *hba) 403 { 404 hba->quirks |= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8; 405 return ufs_intel_common_init(hba); 406 } 407 408 static void ufs_intel_lkf_late_init(struct ufs_hba *hba) 409 { 410 /* LKF always needs a full reset, so set PM accordingly */ 411 if (hba->caps & UFSHCD_CAP_DEEPSLEEP) { 412 hba->spm_lvl = UFS_PM_LVL_6; 413 hba->rpm_lvl = UFS_PM_LVL_6; 414 } else { 415 hba->spm_lvl = UFS_PM_LVL_5; 416 hba->rpm_lvl = UFS_PM_LVL_5; 417 } 418 } 419 420 static int ufs_intel_lkf_init(struct ufs_hba *hba) 421 { 422 struct ufs_host *ufs_host; 423 int err; 424 425 hba->nop_out_timeout = 200; 426 hba->quirks |= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8; 427 hba->caps |= UFSHCD_CAP_CRYPTO; 428 err = ufs_intel_common_init(hba); 429 ufs_host = ufshcd_get_variant(hba); 430 ufs_host->late_init = ufs_intel_lkf_late_init; 431 return err; 432 } 433 434 static int ufs_intel_adl_init(struct ufs_hba *hba) 435 { 436 hba->nop_out_timeout = 200; 437 hba->quirks |= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8; 438 hba->caps |= UFSHCD_CAP_WB_EN; 439 return ufs_intel_common_init(hba); 440 } 441 442 static int ufs_intel_mtl_init(struct ufs_hba *hba) 443 { 444 hba->caps |= UFSHCD_CAP_CRYPTO | UFSHCD_CAP_WB_EN; 445 return ufs_intel_common_init(hba); 446 } 447 448 static struct ufs_hba_variant_ops ufs_intel_cnl_hba_vops = { 449 .name = "intel-pci", 450 .init = ufs_intel_common_init, 451 .exit = ufs_intel_common_exit, 452 .link_startup_notify = ufs_intel_link_startup_notify, 453 .resume = ufs_intel_resume, 454 }; 455 456 static struct ufs_hba_variant_ops ufs_intel_ehl_hba_vops = { 457 .name = "intel-pci", 458 .init = ufs_intel_ehl_init, 459 .exit = ufs_intel_common_exit, 460 .link_startup_notify = ufs_intel_link_startup_notify, 461 .resume = ufs_intel_resume, 462 }; 463 464 static struct ufs_hba_variant_ops ufs_intel_lkf_hba_vops = { 465 .name = "intel-pci", 466 .init = ufs_intel_lkf_init, 467 .exit = ufs_intel_common_exit, 468 .hce_enable_notify = ufs_intel_hce_enable_notify, 469 .link_startup_notify = ufs_intel_link_startup_notify, 470 .pwr_change_notify = ufs_intel_lkf_pwr_change_notify, 471 .apply_dev_quirks = ufs_intel_lkf_apply_dev_quirks, 472 .resume = ufs_intel_resume, 473 .device_reset = ufs_intel_device_reset, 474 }; 475 476 static struct ufs_hba_variant_ops ufs_intel_adl_hba_vops = { 477 .name = "intel-pci", 478 .init = ufs_intel_adl_init, 479 .exit = ufs_intel_common_exit, 480 .link_startup_notify = ufs_intel_link_startup_notify, 481 .resume = ufs_intel_resume, 482 .device_reset = ufs_intel_device_reset, 483 }; 484 485 static struct ufs_hba_variant_ops ufs_intel_mtl_hba_vops = { 486 .name = "intel-pci", 487 .init = ufs_intel_mtl_init, 488 .exit = ufs_intel_common_exit, 489 .hce_enable_notify = ufs_intel_hce_enable_notify, 490 .link_startup_notify = ufs_intel_link_startup_notify, 491 .resume = ufs_intel_resume, 492 .device_reset = ufs_intel_device_reset, 493 }; 494 495 #ifdef CONFIG_PM_SLEEP 496 static int ufshcd_pci_restore(struct device *dev) 497 { 498 struct ufs_hba *hba = dev_get_drvdata(dev); 499 500 /* Force a full reset and restore */ 501 ufshcd_set_link_off(hba); 502 503 return ufshcd_system_resume(dev); 504 } 505 #endif 506 507 /** 508 * ufshcd_pci_shutdown - main function to put the controller in reset state 509 * @pdev: pointer to PCI device handle 510 */ 511 static void ufshcd_pci_shutdown(struct pci_dev *pdev) 512 { 513 ufshcd_shutdown((struct ufs_hba *)pci_get_drvdata(pdev)); 514 } 515 516 /** 517 * ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space 518 * data structure memory 519 * @pdev: pointer to PCI handle 520 */ 521 static void ufshcd_pci_remove(struct pci_dev *pdev) 522 { 523 struct ufs_hba *hba = pci_get_drvdata(pdev); 524 525 pm_runtime_forbid(&pdev->dev); 526 pm_runtime_get_noresume(&pdev->dev); 527 ufshcd_remove(hba); 528 ufshcd_dealloc_host(hba); 529 } 530 531 /** 532 * ufshcd_pci_probe - probe routine of the driver 533 * @pdev: pointer to PCI device handle 534 * @id: PCI device id 535 * 536 * Returns 0 on success, non-zero value on failure 537 */ 538 static int 539 ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 540 { 541 struct ufs_host *ufs_host; 542 struct ufs_hba *hba; 543 void __iomem *mmio_base; 544 int err; 545 546 err = pcim_enable_device(pdev); 547 if (err) { 548 dev_err(&pdev->dev, "pcim_enable_device failed\n"); 549 return err; 550 } 551 552 pci_set_master(pdev); 553 554 err = pcim_iomap_regions(pdev, 1 << 0, UFSHCD); 555 if (err < 0) { 556 dev_err(&pdev->dev, "request and iomap failed\n"); 557 return err; 558 } 559 560 mmio_base = pcim_iomap_table(pdev)[0]; 561 562 err = ufshcd_alloc_host(&pdev->dev, &hba); 563 if (err) { 564 dev_err(&pdev->dev, "Allocation failed\n"); 565 return err; 566 } 567 568 hba->vops = (struct ufs_hba_variant_ops *)id->driver_data; 569 570 err = ufshcd_init(hba, mmio_base, pdev->irq); 571 if (err) { 572 dev_err(&pdev->dev, "Initialization failed\n"); 573 ufshcd_dealloc_host(hba); 574 return err; 575 } 576 577 ufs_host = ufshcd_get_variant(hba); 578 if (ufs_host && ufs_host->late_init) 579 ufs_host->late_init(hba); 580 581 pm_runtime_put_noidle(&pdev->dev); 582 pm_runtime_allow(&pdev->dev); 583 584 return 0; 585 } 586 587 static const struct dev_pm_ops ufshcd_pci_pm_ops = { 588 SET_RUNTIME_PM_OPS(ufshcd_runtime_suspend, ufshcd_runtime_resume, NULL) 589 #ifdef CONFIG_PM_SLEEP 590 .suspend = ufshcd_system_suspend, 591 .resume = ufshcd_system_resume, 592 .freeze = ufshcd_system_suspend, 593 .thaw = ufshcd_system_resume, 594 .poweroff = ufshcd_system_suspend, 595 .restore = ufshcd_pci_restore, 596 .prepare = ufshcd_suspend_prepare, 597 .complete = ufshcd_resume_complete, 598 #endif 599 }; 600 601 static const struct pci_device_id ufshcd_pci_tbl[] = { 602 { PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, 603 { PCI_VDEVICE(INTEL, 0x9DFA), (kernel_ulong_t)&ufs_intel_cnl_hba_vops }, 604 { PCI_VDEVICE(INTEL, 0x4B41), (kernel_ulong_t)&ufs_intel_ehl_hba_vops }, 605 { PCI_VDEVICE(INTEL, 0x4B43), (kernel_ulong_t)&ufs_intel_ehl_hba_vops }, 606 { PCI_VDEVICE(INTEL, 0x98FA), (kernel_ulong_t)&ufs_intel_lkf_hba_vops }, 607 { PCI_VDEVICE(INTEL, 0x51FF), (kernel_ulong_t)&ufs_intel_adl_hba_vops }, 608 { PCI_VDEVICE(INTEL, 0x54FF), (kernel_ulong_t)&ufs_intel_adl_hba_vops }, 609 { PCI_VDEVICE(INTEL, 0x7E47), (kernel_ulong_t)&ufs_intel_mtl_hba_vops }, 610 { PCI_VDEVICE(INTEL, 0xA847), (kernel_ulong_t)&ufs_intel_mtl_hba_vops }, 611 { } /* terminate list */ 612 }; 613 614 MODULE_DEVICE_TABLE(pci, ufshcd_pci_tbl); 615 616 static struct pci_driver ufshcd_pci_driver = { 617 .name = UFSHCD, 618 .id_table = ufshcd_pci_tbl, 619 .probe = ufshcd_pci_probe, 620 .remove = ufshcd_pci_remove, 621 .shutdown = ufshcd_pci_shutdown, 622 .driver = { 623 .pm = &ufshcd_pci_pm_ops 624 }, 625 }; 626 627 module_pci_driver(ufshcd_pci_driver); 628 629 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>"); 630 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>"); 631 MODULE_DESCRIPTION("UFS host controller PCI glue driver"); 632 MODULE_LICENSE("GPL"); 633