1 /* 2 * 3 * Intel Management Engine Interface (Intel MEI) Linux driver 4 * Copyright (c) 2013-2014, Intel Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 */ 16 17 #include <linux/pci.h> 18 #include <linux/jiffies.h> 19 #include <linux/ktime.h> 20 #include <linux/delay.h> 21 #include <linux/kthread.h> 22 #include <linux/interrupt.h> 23 #include <linux/pm_runtime.h> 24 25 #include <linux/mei.h> 26 27 #include "mei_dev.h" 28 #include "hw-txe.h" 29 #include "client.h" 30 #include "hbm.h" 31 32 #include "mei-trace.h" 33 34 35 /** 36 * mei_txe_reg_read - Reads 32bit data from the txe device 37 * 38 * @base_addr: registers base address 39 * @offset: register offset 40 * 41 * Return: register value 42 */ 43 static inline u32 mei_txe_reg_read(void __iomem *base_addr, 44 unsigned long offset) 45 { 46 return ioread32(base_addr + offset); 47 } 48 49 /** 50 * mei_txe_reg_write - Writes 32bit data to the txe device 51 * 52 * @base_addr: registers base address 53 * @offset: register offset 54 * @value: the value to write 55 */ 56 static inline void mei_txe_reg_write(void __iomem *base_addr, 57 unsigned long offset, u32 value) 58 { 59 iowrite32(value, base_addr + offset); 60 } 61 62 /** 63 * mei_txe_sec_reg_read_silent - Reads 32bit data from the SeC BAR 64 * 65 * @hw: the txe hardware structure 66 * @offset: register offset 67 * 68 * Doesn't check for aliveness while Reads 32bit data from the SeC BAR 69 * 70 * Return: register value 71 */ 72 static inline u32 mei_txe_sec_reg_read_silent(struct mei_txe_hw *hw, 73 unsigned long offset) 74 { 75 return mei_txe_reg_read(hw->mem_addr[SEC_BAR], offset); 76 } 77 78 /** 79 * mei_txe_sec_reg_read - Reads 32bit data from the SeC BAR 80 * 81 * @hw: the txe hardware structure 82 * @offset: register offset 83 * 84 * Reads 32bit data from the SeC BAR and shout loud if aliveness is not set 85 * 86 * Return: register value 87 */ 88 static inline u32 mei_txe_sec_reg_read(struct mei_txe_hw *hw, 89 unsigned long offset) 90 { 91 WARN(!hw->aliveness, "sec read: aliveness not asserted\n"); 92 return mei_txe_sec_reg_read_silent(hw, offset); 93 } 94 /** 95 * mei_txe_sec_reg_write_silent - Writes 32bit data to the SeC BAR 96 * doesn't check for aliveness 97 * 98 * @hw: the txe hardware structure 99 * @offset: register offset 100 * @value: value to write 101 * 102 * Doesn't check for aliveness while writes 32bit data from to the SeC BAR 103 */ 104 static inline void mei_txe_sec_reg_write_silent(struct mei_txe_hw *hw, 105 unsigned long offset, u32 value) 106 { 107 mei_txe_reg_write(hw->mem_addr[SEC_BAR], offset, value); 108 } 109 110 /** 111 * mei_txe_sec_reg_write - Writes 32bit data to the SeC BAR 112 * 113 * @hw: the txe hardware structure 114 * @offset: register offset 115 * @value: value to write 116 * 117 * Writes 32bit data from the SeC BAR and shout loud if aliveness is not set 118 */ 119 static inline void mei_txe_sec_reg_write(struct mei_txe_hw *hw, 120 unsigned long offset, u32 value) 121 { 122 WARN(!hw->aliveness, "sec write: aliveness not asserted\n"); 123 mei_txe_sec_reg_write_silent(hw, offset, value); 124 } 125 /** 126 * mei_txe_br_reg_read - Reads 32bit data from the Bridge BAR 127 * 128 * @hw: the txe hardware structure 129 * @offset: offset from which to read the data 130 * 131 * Return: the byte read. 132 */ 133 static inline u32 mei_txe_br_reg_read(struct mei_txe_hw *hw, 134 unsigned long offset) 135 { 136 return mei_txe_reg_read(hw->mem_addr[BRIDGE_BAR], offset); 137 } 138 139 /** 140 * mei_txe_br_reg_write - Writes 32bit data to the Bridge BAR 141 * 142 * @hw: the txe hardware structure 143 * @offset: offset from which to write the data 144 * @value: the byte to write 145 */ 146 static inline void mei_txe_br_reg_write(struct mei_txe_hw *hw, 147 unsigned long offset, u32 value) 148 { 149 mei_txe_reg_write(hw->mem_addr[BRIDGE_BAR], offset, value); 150 } 151 152 /** 153 * mei_txe_aliveness_set - request for aliveness change 154 * 155 * @dev: the device structure 156 * @req: requested aliveness value 157 * 158 * Request for aliveness change and returns true if the change is 159 * really needed and false if aliveness is already 160 * in the requested state 161 * 162 * Locking: called under "dev->device_lock" lock 163 * 164 * Return: true if request was send 165 */ 166 static bool mei_txe_aliveness_set(struct mei_device *dev, u32 req) 167 { 168 169 struct mei_txe_hw *hw = to_txe_hw(dev); 170 bool do_req = hw->aliveness != req; 171 172 dev_dbg(dev->dev, "Aliveness current=%d request=%d\n", 173 hw->aliveness, req); 174 if (do_req) { 175 dev->pg_event = MEI_PG_EVENT_WAIT; 176 mei_txe_br_reg_write(hw, SICR_HOST_ALIVENESS_REQ_REG, req); 177 } 178 return do_req; 179 } 180 181 182 /** 183 * mei_txe_aliveness_req_get - get aliveness requested register value 184 * 185 * @dev: the device structure 186 * 187 * Extract HICR_HOST_ALIVENESS_RESP_ACK bit from 188 * from HICR_HOST_ALIVENESS_REQ register value 189 * 190 * Return: SICR_HOST_ALIVENESS_REQ_REQUESTED bit value 191 */ 192 static u32 mei_txe_aliveness_req_get(struct mei_device *dev) 193 { 194 struct mei_txe_hw *hw = to_txe_hw(dev); 195 u32 reg; 196 197 reg = mei_txe_br_reg_read(hw, SICR_HOST_ALIVENESS_REQ_REG); 198 return reg & SICR_HOST_ALIVENESS_REQ_REQUESTED; 199 } 200 201 /** 202 * mei_txe_aliveness_get - get aliveness response register value 203 * 204 * @dev: the device structure 205 * 206 * Return: HICR_HOST_ALIVENESS_RESP_ACK bit from HICR_HOST_ALIVENESS_RESP 207 * register 208 */ 209 static u32 mei_txe_aliveness_get(struct mei_device *dev) 210 { 211 struct mei_txe_hw *hw = to_txe_hw(dev); 212 u32 reg; 213 214 reg = mei_txe_br_reg_read(hw, HICR_HOST_ALIVENESS_RESP_REG); 215 return reg & HICR_HOST_ALIVENESS_RESP_ACK; 216 } 217 218 /** 219 * mei_txe_aliveness_poll - waits for aliveness to settle 220 * 221 * @dev: the device structure 222 * @expected: expected aliveness value 223 * 224 * Polls for HICR_HOST_ALIVENESS_RESP.ALIVENESS_RESP to be set 225 * 226 * Return: 0 if the expected value was received, -ETIME otherwise 227 */ 228 static int mei_txe_aliveness_poll(struct mei_device *dev, u32 expected) 229 { 230 struct mei_txe_hw *hw = to_txe_hw(dev); 231 ktime_t stop, start; 232 233 start = ktime_get(); 234 stop = ktime_add(start, ms_to_ktime(SEC_ALIVENESS_WAIT_TIMEOUT)); 235 do { 236 hw->aliveness = mei_txe_aliveness_get(dev); 237 if (hw->aliveness == expected) { 238 dev->pg_event = MEI_PG_EVENT_IDLE; 239 dev_dbg(dev->dev, "aliveness settled after %lld usecs\n", 240 ktime_to_us(ktime_sub(ktime_get(), start))); 241 return 0; 242 } 243 usleep_range(20, 50); 244 } while (ktime_before(ktime_get(), stop)); 245 246 dev->pg_event = MEI_PG_EVENT_IDLE; 247 dev_err(dev->dev, "aliveness timed out\n"); 248 return -ETIME; 249 } 250 251 /** 252 * mei_txe_aliveness_wait - waits for aliveness to settle 253 * 254 * @dev: the device structure 255 * @expected: expected aliveness value 256 * 257 * Waits for HICR_HOST_ALIVENESS_RESP.ALIVENESS_RESP to be set 258 * 259 * Return: 0 on success and < 0 otherwise 260 */ 261 static int mei_txe_aliveness_wait(struct mei_device *dev, u32 expected) 262 { 263 struct mei_txe_hw *hw = to_txe_hw(dev); 264 const unsigned long timeout = 265 msecs_to_jiffies(SEC_ALIVENESS_WAIT_TIMEOUT); 266 long err; 267 int ret; 268 269 hw->aliveness = mei_txe_aliveness_get(dev); 270 if (hw->aliveness == expected) 271 return 0; 272 273 mutex_unlock(&dev->device_lock); 274 err = wait_event_timeout(hw->wait_aliveness_resp, 275 dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout); 276 mutex_lock(&dev->device_lock); 277 278 hw->aliveness = mei_txe_aliveness_get(dev); 279 ret = hw->aliveness == expected ? 0 : -ETIME; 280 281 if (ret) 282 dev_warn(dev->dev, "aliveness timed out = %ld aliveness = %d event = %d\n", 283 err, hw->aliveness, dev->pg_event); 284 else 285 dev_dbg(dev->dev, "aliveness settled after = %d msec aliveness = %d event = %d\n", 286 jiffies_to_msecs(timeout - err), 287 hw->aliveness, dev->pg_event); 288 289 dev->pg_event = MEI_PG_EVENT_IDLE; 290 return ret; 291 } 292 293 /** 294 * mei_txe_aliveness_set_sync - sets an wait for aliveness to complete 295 * 296 * @dev: the device structure 297 * @req: requested aliveness value 298 * 299 * Return: 0 on success and < 0 otherwise 300 */ 301 int mei_txe_aliveness_set_sync(struct mei_device *dev, u32 req) 302 { 303 if (mei_txe_aliveness_set(dev, req)) 304 return mei_txe_aliveness_wait(dev, req); 305 return 0; 306 } 307 308 /** 309 * mei_txe_pg_in_transition - is device now in pg transition 310 * 311 * @dev: the device structure 312 * 313 * Return: true if in pg transition, false otherwise 314 */ 315 static bool mei_txe_pg_in_transition(struct mei_device *dev) 316 { 317 return dev->pg_event == MEI_PG_EVENT_WAIT; 318 } 319 320 /** 321 * mei_txe_pg_is_enabled - detect if PG is supported by HW 322 * 323 * @dev: the device structure 324 * 325 * Return: true is pg supported, false otherwise 326 */ 327 static bool mei_txe_pg_is_enabled(struct mei_device *dev) 328 { 329 return true; 330 } 331 332 /** 333 * mei_txe_pg_state - translate aliveness register value 334 * to the mei power gating state 335 * 336 * @dev: the device structure 337 * 338 * Return: MEI_PG_OFF if aliveness is on and MEI_PG_ON otherwise 339 */ 340 static inline enum mei_pg_state mei_txe_pg_state(struct mei_device *dev) 341 { 342 struct mei_txe_hw *hw = to_txe_hw(dev); 343 344 return hw->aliveness ? MEI_PG_OFF : MEI_PG_ON; 345 } 346 347 /** 348 * mei_txe_input_ready_interrupt_enable - sets the Input Ready Interrupt 349 * 350 * @dev: the device structure 351 */ 352 static void mei_txe_input_ready_interrupt_enable(struct mei_device *dev) 353 { 354 struct mei_txe_hw *hw = to_txe_hw(dev); 355 u32 hintmsk; 356 /* Enable the SEC_IPC_HOST_INT_MASK_IN_RDY interrupt */ 357 hintmsk = mei_txe_sec_reg_read(hw, SEC_IPC_HOST_INT_MASK_REG); 358 hintmsk |= SEC_IPC_HOST_INT_MASK_IN_RDY; 359 mei_txe_sec_reg_write(hw, SEC_IPC_HOST_INT_MASK_REG, hintmsk); 360 } 361 362 /** 363 * mei_txe_input_doorbell_set - sets bit 0 in 364 * SEC_IPC_INPUT_DOORBELL.IPC_INPUT_DOORBELL. 365 * 366 * @hw: the txe hardware structure 367 */ 368 static void mei_txe_input_doorbell_set(struct mei_txe_hw *hw) 369 { 370 /* Clear the interrupt cause */ 371 clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause); 372 mei_txe_sec_reg_write(hw, SEC_IPC_INPUT_DOORBELL_REG, 1); 373 } 374 375 /** 376 * mei_txe_output_ready_set - Sets the SICR_SEC_IPC_OUTPUT_STATUS bit to 1 377 * 378 * @hw: the txe hardware structure 379 */ 380 static void mei_txe_output_ready_set(struct mei_txe_hw *hw) 381 { 382 mei_txe_br_reg_write(hw, 383 SICR_SEC_IPC_OUTPUT_STATUS_REG, 384 SEC_IPC_OUTPUT_STATUS_RDY); 385 } 386 387 /** 388 * mei_txe_is_input_ready - check if TXE is ready for receiving data 389 * 390 * @dev: the device structure 391 * 392 * Return: true if INPUT STATUS READY bit is set 393 */ 394 static bool mei_txe_is_input_ready(struct mei_device *dev) 395 { 396 struct mei_txe_hw *hw = to_txe_hw(dev); 397 u32 status; 398 399 status = mei_txe_sec_reg_read(hw, SEC_IPC_INPUT_STATUS_REG); 400 return !!(SEC_IPC_INPUT_STATUS_RDY & status); 401 } 402 403 /** 404 * mei_txe_intr_clear - clear all interrupts 405 * 406 * @dev: the device structure 407 */ 408 static inline void mei_txe_intr_clear(struct mei_device *dev) 409 { 410 struct mei_txe_hw *hw = to_txe_hw(dev); 411 412 mei_txe_sec_reg_write_silent(hw, SEC_IPC_HOST_INT_STATUS_REG, 413 SEC_IPC_HOST_INT_STATUS_PENDING); 414 mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_STS_MSK); 415 mei_txe_br_reg_write(hw, HHISR_REG, IPC_HHIER_MSK); 416 } 417 418 /** 419 * mei_txe_intr_disable - disable all interrupts 420 * 421 * @dev: the device structure 422 */ 423 static void mei_txe_intr_disable(struct mei_device *dev) 424 { 425 struct mei_txe_hw *hw = to_txe_hw(dev); 426 427 mei_txe_br_reg_write(hw, HHIER_REG, 0); 428 mei_txe_br_reg_write(hw, HIER_REG, 0); 429 } 430 /** 431 * mei_txe_intr_enable - enable all interrupts 432 * 433 * @dev: the device structure 434 */ 435 static void mei_txe_intr_enable(struct mei_device *dev) 436 { 437 struct mei_txe_hw *hw = to_txe_hw(dev); 438 439 mei_txe_br_reg_write(hw, HHIER_REG, IPC_HHIER_MSK); 440 mei_txe_br_reg_write(hw, HIER_REG, HIER_INT_EN_MSK); 441 } 442 443 /** 444 * mei_txe_synchronize_irq - wait for pending IRQ handlers 445 * 446 * @dev: the device structure 447 */ 448 static void mei_txe_synchronize_irq(struct mei_device *dev) 449 { 450 struct pci_dev *pdev = to_pci_dev(dev->dev); 451 452 synchronize_irq(pdev->irq); 453 } 454 455 /** 456 * mei_txe_pending_interrupts - check if there are pending interrupts 457 * only Aliveness, Input ready, and output doorbell are of relevance 458 * 459 * @dev: the device structure 460 * 461 * Checks if there are pending interrupts 462 * only Aliveness, Readiness, Input ready, and Output doorbell are relevant 463 * 464 * Return: true if there are pending interrupts 465 */ 466 static bool mei_txe_pending_interrupts(struct mei_device *dev) 467 { 468 469 struct mei_txe_hw *hw = to_txe_hw(dev); 470 bool ret = (hw->intr_cause & (TXE_INTR_READINESS | 471 TXE_INTR_ALIVENESS | 472 TXE_INTR_IN_READY | 473 TXE_INTR_OUT_DB)); 474 475 if (ret) { 476 dev_dbg(dev->dev, 477 "Pending Interrupts InReady=%01d Readiness=%01d, Aliveness=%01d, OutDoor=%01d\n", 478 !!(hw->intr_cause & TXE_INTR_IN_READY), 479 !!(hw->intr_cause & TXE_INTR_READINESS), 480 !!(hw->intr_cause & TXE_INTR_ALIVENESS), 481 !!(hw->intr_cause & TXE_INTR_OUT_DB)); 482 } 483 return ret; 484 } 485 486 /** 487 * mei_txe_input_payload_write - write a dword to the host buffer 488 * at offset idx 489 * 490 * @dev: the device structure 491 * @idx: index in the host buffer 492 * @value: value 493 */ 494 static void mei_txe_input_payload_write(struct mei_device *dev, 495 unsigned long idx, u32 value) 496 { 497 struct mei_txe_hw *hw = to_txe_hw(dev); 498 499 mei_txe_sec_reg_write(hw, SEC_IPC_INPUT_PAYLOAD_REG + 500 (idx * sizeof(u32)), value); 501 } 502 503 /** 504 * mei_txe_out_data_read - read dword from the device buffer 505 * at offset idx 506 * 507 * @dev: the device structure 508 * @idx: index in the device buffer 509 * 510 * Return: register value at index 511 */ 512 static u32 mei_txe_out_data_read(const struct mei_device *dev, 513 unsigned long idx) 514 { 515 struct mei_txe_hw *hw = to_txe_hw(dev); 516 517 return mei_txe_br_reg_read(hw, 518 BRIDGE_IPC_OUTPUT_PAYLOAD_REG + (idx * sizeof(u32))); 519 } 520 521 /* Readiness */ 522 523 /** 524 * mei_txe_readiness_set_host_rdy - set host readiness bit 525 * 526 * @dev: the device structure 527 */ 528 static void mei_txe_readiness_set_host_rdy(struct mei_device *dev) 529 { 530 struct mei_txe_hw *hw = to_txe_hw(dev); 531 532 mei_txe_br_reg_write(hw, 533 SICR_HOST_IPC_READINESS_REQ_REG, 534 SICR_HOST_IPC_READINESS_HOST_RDY); 535 } 536 537 /** 538 * mei_txe_readiness_clear - clear host readiness bit 539 * 540 * @dev: the device structure 541 */ 542 static void mei_txe_readiness_clear(struct mei_device *dev) 543 { 544 struct mei_txe_hw *hw = to_txe_hw(dev); 545 546 mei_txe_br_reg_write(hw, SICR_HOST_IPC_READINESS_REQ_REG, 547 SICR_HOST_IPC_READINESS_RDY_CLR); 548 } 549 /** 550 * mei_txe_readiness_get - Reads and returns 551 * the HICR_SEC_IPC_READINESS register value 552 * 553 * @dev: the device structure 554 * 555 * Return: the HICR_SEC_IPC_READINESS register value 556 */ 557 static u32 mei_txe_readiness_get(struct mei_device *dev) 558 { 559 struct mei_txe_hw *hw = to_txe_hw(dev); 560 561 return mei_txe_br_reg_read(hw, HICR_SEC_IPC_READINESS_REG); 562 } 563 564 565 /** 566 * mei_txe_readiness_is_sec_rdy - check readiness 567 * for HICR_SEC_IPC_READINESS_SEC_RDY 568 * 569 * @readiness: cached readiness state 570 * 571 * Return: true if readiness bit is set 572 */ 573 static inline bool mei_txe_readiness_is_sec_rdy(u32 readiness) 574 { 575 return !!(readiness & HICR_SEC_IPC_READINESS_SEC_RDY); 576 } 577 578 /** 579 * mei_txe_hw_is_ready - check if the hw is ready 580 * 581 * @dev: the device structure 582 * 583 * Return: true if sec is ready 584 */ 585 static bool mei_txe_hw_is_ready(struct mei_device *dev) 586 { 587 u32 readiness = mei_txe_readiness_get(dev); 588 589 return mei_txe_readiness_is_sec_rdy(readiness); 590 } 591 592 /** 593 * mei_txe_host_is_ready - check if the host is ready 594 * 595 * @dev: the device structure 596 * 597 * Return: true if host is ready 598 */ 599 static inline bool mei_txe_host_is_ready(struct mei_device *dev) 600 { 601 struct mei_txe_hw *hw = to_txe_hw(dev); 602 u32 reg = mei_txe_br_reg_read(hw, HICR_SEC_IPC_READINESS_REG); 603 604 return !!(reg & HICR_SEC_IPC_READINESS_HOST_RDY); 605 } 606 607 /** 608 * mei_txe_readiness_wait - wait till readiness settles 609 * 610 * @dev: the device structure 611 * 612 * Return: 0 on success and -ETIME on timeout 613 */ 614 static int mei_txe_readiness_wait(struct mei_device *dev) 615 { 616 if (mei_txe_hw_is_ready(dev)) 617 return 0; 618 619 mutex_unlock(&dev->device_lock); 620 wait_event_timeout(dev->wait_hw_ready, dev->recvd_hw_ready, 621 msecs_to_jiffies(SEC_RESET_WAIT_TIMEOUT)); 622 mutex_lock(&dev->device_lock); 623 if (!dev->recvd_hw_ready) { 624 dev_err(dev->dev, "wait for readiness failed\n"); 625 return -ETIME; 626 } 627 628 dev->recvd_hw_ready = false; 629 return 0; 630 } 631 632 static const struct mei_fw_status mei_txe_fw_sts = { 633 .count = 2, 634 .status[0] = PCI_CFG_TXE_FW_STS0, 635 .status[1] = PCI_CFG_TXE_FW_STS1 636 }; 637 638 /** 639 * mei_txe_fw_status - read fw status register from pci config space 640 * 641 * @dev: mei device 642 * @fw_status: fw status register values 643 * 644 * Return: 0 on success, error otherwise 645 */ 646 static int mei_txe_fw_status(struct mei_device *dev, 647 struct mei_fw_status *fw_status) 648 { 649 const struct mei_fw_status *fw_src = &mei_txe_fw_sts; 650 struct pci_dev *pdev = to_pci_dev(dev->dev); 651 int ret; 652 int i; 653 654 if (!fw_status) 655 return -EINVAL; 656 657 fw_status->count = fw_src->count; 658 for (i = 0; i < fw_src->count && i < MEI_FW_STATUS_MAX; i++) { 659 ret = pci_read_config_dword(pdev, fw_src->status[i], 660 &fw_status->status[i]); 661 trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HSF_X", 662 fw_src->status[i], 663 fw_status->status[i]); 664 if (ret) 665 return ret; 666 } 667 668 return 0; 669 } 670 671 /** 672 * mei_txe_hw_config - configure hardware at the start of the devices 673 * 674 * @dev: the device structure 675 * 676 * Configure hardware at the start of the device should be done only 677 * once at the device probe time 678 */ 679 static void mei_txe_hw_config(struct mei_device *dev) 680 { 681 682 struct mei_txe_hw *hw = to_txe_hw(dev); 683 684 /* Doesn't change in runtime */ 685 dev->hbuf_depth = PAYLOAD_SIZE / 4; 686 687 hw->aliveness = mei_txe_aliveness_get(dev); 688 hw->readiness = mei_txe_readiness_get(dev); 689 690 dev_dbg(dev->dev, "aliveness_resp = 0x%08x, readiness = 0x%08x.\n", 691 hw->aliveness, hw->readiness); 692 } 693 694 695 /** 696 * mei_txe_write - writes a message to device. 697 * 698 * @dev: the device structure 699 * @header: header of message 700 * @buf: message buffer will be written 701 * 702 * Return: 0 if success, <0 - otherwise. 703 */ 704 705 static int mei_txe_write(struct mei_device *dev, 706 struct mei_msg_hdr *header, 707 const unsigned char *buf) 708 { 709 struct mei_txe_hw *hw = to_txe_hw(dev); 710 unsigned long rem; 711 unsigned long length; 712 int slots = dev->hbuf_depth; 713 u32 *reg_buf = (u32 *)buf; 714 u32 dw_cnt; 715 int i; 716 717 if (WARN_ON(!header || !buf)) 718 return -EINVAL; 719 720 length = header->length; 721 722 dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM(header)); 723 724 dw_cnt = mei_data2slots(length); 725 if (dw_cnt > slots) 726 return -EMSGSIZE; 727 728 if (WARN(!hw->aliveness, "txe write: aliveness not asserted\n")) 729 return -EAGAIN; 730 731 /* Enable Input Ready Interrupt. */ 732 mei_txe_input_ready_interrupt_enable(dev); 733 734 if (!mei_txe_is_input_ready(dev)) { 735 char fw_sts_str[MEI_FW_STATUS_STR_SZ]; 736 737 mei_fw_status_str(dev, fw_sts_str, MEI_FW_STATUS_STR_SZ); 738 dev_err(dev->dev, "Input is not ready %s\n", fw_sts_str); 739 return -EAGAIN; 740 } 741 742 mei_txe_input_payload_write(dev, 0, *((u32 *)header)); 743 744 for (i = 0; i < length / 4; i++) 745 mei_txe_input_payload_write(dev, i + 1, reg_buf[i]); 746 747 rem = length & 0x3; 748 if (rem > 0) { 749 u32 reg = 0; 750 751 memcpy(®, &buf[length - rem], rem); 752 mei_txe_input_payload_write(dev, i + 1, reg); 753 } 754 755 /* after each write the whole buffer is consumed */ 756 hw->slots = 0; 757 758 /* Set Input-Doorbell */ 759 mei_txe_input_doorbell_set(hw); 760 761 return 0; 762 } 763 764 /** 765 * mei_txe_hbuf_max_len - mimics the me hbuf circular buffer 766 * 767 * @dev: the device structure 768 * 769 * Return: the PAYLOAD_SIZE - 4 770 */ 771 static size_t mei_txe_hbuf_max_len(const struct mei_device *dev) 772 { 773 return PAYLOAD_SIZE - sizeof(struct mei_msg_hdr); 774 } 775 776 /** 777 * mei_txe_hbuf_empty_slots - mimics the me hbuf circular buffer 778 * 779 * @dev: the device structure 780 * 781 * Return: always hbuf_depth 782 */ 783 static int mei_txe_hbuf_empty_slots(struct mei_device *dev) 784 { 785 struct mei_txe_hw *hw = to_txe_hw(dev); 786 787 return hw->slots; 788 } 789 790 /** 791 * mei_txe_count_full_read_slots - mimics the me device circular buffer 792 * 793 * @dev: the device structure 794 * 795 * Return: always buffer size in dwords count 796 */ 797 static int mei_txe_count_full_read_slots(struct mei_device *dev) 798 { 799 /* read buffers has static size */ 800 return PAYLOAD_SIZE / 4; 801 } 802 803 /** 804 * mei_txe_read_hdr - read message header which is always in 4 first bytes 805 * 806 * @dev: the device structure 807 * 808 * Return: mei message header 809 */ 810 811 static u32 mei_txe_read_hdr(const struct mei_device *dev) 812 { 813 return mei_txe_out_data_read(dev, 0); 814 } 815 /** 816 * mei_txe_read - reads a message from the txe device. 817 * 818 * @dev: the device structure 819 * @buf: message buffer will be written 820 * @len: message size will be read 821 * 822 * Return: -EINVAL on error wrong argument and 0 on success 823 */ 824 static int mei_txe_read(struct mei_device *dev, 825 unsigned char *buf, unsigned long len) 826 { 827 828 struct mei_txe_hw *hw = to_txe_hw(dev); 829 u32 *reg_buf, reg; 830 u32 rem; 831 u32 i; 832 833 if (WARN_ON(!buf || !len)) 834 return -EINVAL; 835 836 reg_buf = (u32 *)buf; 837 rem = len & 0x3; 838 839 dev_dbg(dev->dev, "buffer-length = %lu buf[0]0x%08X\n", 840 len, mei_txe_out_data_read(dev, 0)); 841 842 for (i = 0; i < len / 4; i++) { 843 /* skip header: index starts from 1 */ 844 reg = mei_txe_out_data_read(dev, i + 1); 845 dev_dbg(dev->dev, "buf[%d] = 0x%08X\n", i, reg); 846 *reg_buf++ = reg; 847 } 848 849 if (rem) { 850 reg = mei_txe_out_data_read(dev, i + 1); 851 memcpy(reg_buf, ®, rem); 852 } 853 854 mei_txe_output_ready_set(hw); 855 return 0; 856 } 857 858 /** 859 * mei_txe_hw_reset - resets host and fw. 860 * 861 * @dev: the device structure 862 * @intr_enable: if interrupt should be enabled after reset. 863 * 864 * Return: 0 on success and < 0 in case of error 865 */ 866 static int mei_txe_hw_reset(struct mei_device *dev, bool intr_enable) 867 { 868 struct mei_txe_hw *hw = to_txe_hw(dev); 869 870 u32 aliveness_req; 871 /* 872 * read input doorbell to ensure consistency between Bridge and SeC 873 * return value might be garbage return 874 */ 875 (void)mei_txe_sec_reg_read_silent(hw, SEC_IPC_INPUT_DOORBELL_REG); 876 877 aliveness_req = mei_txe_aliveness_req_get(dev); 878 hw->aliveness = mei_txe_aliveness_get(dev); 879 880 /* Disable interrupts in this stage we will poll */ 881 mei_txe_intr_disable(dev); 882 883 /* 884 * If Aliveness Request and Aliveness Response are not equal then 885 * wait for them to be equal 886 * Since we might have interrupts disabled - poll for it 887 */ 888 if (aliveness_req != hw->aliveness) 889 if (mei_txe_aliveness_poll(dev, aliveness_req) < 0) { 890 dev_err(dev->dev, "wait for aliveness settle failed ... bailing out\n"); 891 return -EIO; 892 } 893 894 /* 895 * If Aliveness Request and Aliveness Response are set then clear them 896 */ 897 if (aliveness_req) { 898 mei_txe_aliveness_set(dev, 0); 899 if (mei_txe_aliveness_poll(dev, 0) < 0) { 900 dev_err(dev->dev, "wait for aliveness failed ... bailing out\n"); 901 return -EIO; 902 } 903 } 904 905 /* 906 * Set readiness RDY_CLR bit 907 */ 908 mei_txe_readiness_clear(dev); 909 910 return 0; 911 } 912 913 /** 914 * mei_txe_hw_start - start the hardware after reset 915 * 916 * @dev: the device structure 917 * 918 * Return: 0 on success an error code otherwise 919 */ 920 static int mei_txe_hw_start(struct mei_device *dev) 921 { 922 struct mei_txe_hw *hw = to_txe_hw(dev); 923 int ret; 924 925 u32 hisr; 926 927 /* bring back interrupts */ 928 mei_txe_intr_enable(dev); 929 930 ret = mei_txe_readiness_wait(dev); 931 if (ret < 0) { 932 dev_err(dev->dev, "waiting for readiness failed\n"); 933 return ret; 934 } 935 936 /* 937 * If HISR.INT2_STS interrupt status bit is set then clear it. 938 */ 939 hisr = mei_txe_br_reg_read(hw, HISR_REG); 940 if (hisr & HISR_INT_2_STS) 941 mei_txe_br_reg_write(hw, HISR_REG, HISR_INT_2_STS); 942 943 /* Clear the interrupt cause of OutputDoorbell */ 944 clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause); 945 946 ret = mei_txe_aliveness_set_sync(dev, 1); 947 if (ret < 0) { 948 dev_err(dev->dev, "wait for aliveness failed ... bailing out\n"); 949 return ret; 950 } 951 952 pm_runtime_set_active(dev->dev); 953 954 /* enable input ready interrupts: 955 * SEC_IPC_HOST_INT_MASK.IPC_INPUT_READY_INT_MASK 956 */ 957 mei_txe_input_ready_interrupt_enable(dev); 958 959 960 /* Set the SICR_SEC_IPC_OUTPUT_STATUS.IPC_OUTPUT_READY bit */ 961 mei_txe_output_ready_set(hw); 962 963 /* Set bit SICR_HOST_IPC_READINESS.HOST_RDY 964 */ 965 mei_txe_readiness_set_host_rdy(dev); 966 967 return 0; 968 } 969 970 /** 971 * mei_txe_check_and_ack_intrs - translate multi BAR interrupt into 972 * single bit mask and acknowledge the interrupts 973 * 974 * @dev: the device structure 975 * @do_ack: acknowledge interrupts 976 * 977 * Return: true if found interrupts to process. 978 */ 979 static bool mei_txe_check_and_ack_intrs(struct mei_device *dev, bool do_ack) 980 { 981 struct mei_txe_hw *hw = to_txe_hw(dev); 982 u32 hisr; 983 u32 hhisr; 984 u32 ipc_isr; 985 u32 aliveness; 986 bool generated; 987 988 /* read interrupt registers */ 989 hhisr = mei_txe_br_reg_read(hw, HHISR_REG); 990 generated = (hhisr & IPC_HHIER_MSK); 991 if (!generated) 992 goto out; 993 994 hisr = mei_txe_br_reg_read(hw, HISR_REG); 995 996 aliveness = mei_txe_aliveness_get(dev); 997 if (hhisr & IPC_HHIER_SEC && aliveness) { 998 ipc_isr = mei_txe_sec_reg_read_silent(hw, 999 SEC_IPC_HOST_INT_STATUS_REG); 1000 } else { 1001 ipc_isr = 0; 1002 hhisr &= ~IPC_HHIER_SEC; 1003 } 1004 1005 generated = generated || 1006 (hisr & HISR_INT_STS_MSK) || 1007 (ipc_isr & SEC_IPC_HOST_INT_STATUS_PENDING); 1008 1009 if (generated && do_ack) { 1010 /* Save the interrupt causes */ 1011 hw->intr_cause |= hisr & HISR_INT_STS_MSK; 1012 if (ipc_isr & SEC_IPC_HOST_INT_STATUS_IN_RDY) 1013 hw->intr_cause |= TXE_INTR_IN_READY; 1014 1015 1016 mei_txe_intr_disable(dev); 1017 /* Clear the interrupts in hierarchy: 1018 * IPC and Bridge, than the High Level */ 1019 mei_txe_sec_reg_write_silent(hw, 1020 SEC_IPC_HOST_INT_STATUS_REG, ipc_isr); 1021 mei_txe_br_reg_write(hw, HISR_REG, hisr); 1022 mei_txe_br_reg_write(hw, HHISR_REG, hhisr); 1023 } 1024 1025 out: 1026 return generated; 1027 } 1028 1029 /** 1030 * mei_txe_irq_quick_handler - The ISR of the MEI device 1031 * 1032 * @irq: The irq number 1033 * @dev_id: pointer to the device structure 1034 * 1035 * Return: IRQ_WAKE_THREAD if interrupt is designed for the device 1036 * IRQ_NONE otherwise 1037 */ 1038 irqreturn_t mei_txe_irq_quick_handler(int irq, void *dev_id) 1039 { 1040 struct mei_device *dev = dev_id; 1041 1042 if (mei_txe_check_and_ack_intrs(dev, true)) 1043 return IRQ_WAKE_THREAD; 1044 return IRQ_NONE; 1045 } 1046 1047 1048 /** 1049 * mei_txe_irq_thread_handler - txe interrupt thread 1050 * 1051 * @irq: The irq number 1052 * @dev_id: pointer to the device structure 1053 * 1054 * Return: IRQ_HANDLED 1055 */ 1056 irqreturn_t mei_txe_irq_thread_handler(int irq, void *dev_id) 1057 { 1058 struct mei_device *dev = (struct mei_device *) dev_id; 1059 struct mei_txe_hw *hw = to_txe_hw(dev); 1060 struct mei_cl_cb complete_list; 1061 s32 slots; 1062 int rets = 0; 1063 1064 dev_dbg(dev->dev, "irq thread: Interrupt Registers HHISR|HISR|SEC=%02X|%04X|%02X\n", 1065 mei_txe_br_reg_read(hw, HHISR_REG), 1066 mei_txe_br_reg_read(hw, HISR_REG), 1067 mei_txe_sec_reg_read_silent(hw, SEC_IPC_HOST_INT_STATUS_REG)); 1068 1069 1070 /* initialize our complete list */ 1071 mutex_lock(&dev->device_lock); 1072 mei_io_list_init(&complete_list); 1073 1074 if (pci_dev_msi_enabled(to_pci_dev(dev->dev))) 1075 mei_txe_check_and_ack_intrs(dev, true); 1076 1077 /* show irq events */ 1078 mei_txe_pending_interrupts(dev); 1079 1080 hw->aliveness = mei_txe_aliveness_get(dev); 1081 hw->readiness = mei_txe_readiness_get(dev); 1082 1083 /* Readiness: 1084 * Detection of TXE driver going through reset 1085 * or TXE driver resetting the HECI interface. 1086 */ 1087 if (test_and_clear_bit(TXE_INTR_READINESS_BIT, &hw->intr_cause)) { 1088 dev_dbg(dev->dev, "Readiness Interrupt was received...\n"); 1089 1090 /* Check if SeC is going through reset */ 1091 if (mei_txe_readiness_is_sec_rdy(hw->readiness)) { 1092 dev_dbg(dev->dev, "we need to start the dev.\n"); 1093 dev->recvd_hw_ready = true; 1094 } else { 1095 dev->recvd_hw_ready = false; 1096 if (dev->dev_state != MEI_DEV_RESETTING) { 1097 1098 dev_warn(dev->dev, "FW not ready: resetting.\n"); 1099 schedule_work(&dev->reset_work); 1100 goto end; 1101 1102 } 1103 } 1104 wake_up(&dev->wait_hw_ready); 1105 } 1106 1107 /************************************************************/ 1108 /* Check interrupt cause: 1109 * Aliveness: Detection of SeC acknowledge of host request that 1110 * it remain alive or host cancellation of that request. 1111 */ 1112 1113 if (test_and_clear_bit(TXE_INTR_ALIVENESS_BIT, &hw->intr_cause)) { 1114 /* Clear the interrupt cause */ 1115 dev_dbg(dev->dev, 1116 "Aliveness Interrupt: Status: %d\n", hw->aliveness); 1117 dev->pg_event = MEI_PG_EVENT_RECEIVED; 1118 if (waitqueue_active(&hw->wait_aliveness_resp)) 1119 wake_up(&hw->wait_aliveness_resp); 1120 } 1121 1122 1123 /* Output Doorbell: 1124 * Detection of SeC having sent output to host 1125 */ 1126 slots = mei_count_full_read_slots(dev); 1127 if (test_and_clear_bit(TXE_INTR_OUT_DB_BIT, &hw->intr_cause)) { 1128 /* Read from TXE */ 1129 rets = mei_irq_read_handler(dev, &complete_list, &slots); 1130 if (rets && dev->dev_state != MEI_DEV_RESETTING) { 1131 dev_err(dev->dev, 1132 "mei_irq_read_handler ret = %d.\n", rets); 1133 1134 schedule_work(&dev->reset_work); 1135 goto end; 1136 } 1137 } 1138 /* Input Ready: Detection if host can write to SeC */ 1139 if (test_and_clear_bit(TXE_INTR_IN_READY_BIT, &hw->intr_cause)) { 1140 dev->hbuf_is_ready = true; 1141 hw->slots = dev->hbuf_depth; 1142 } 1143 1144 if (hw->aliveness && dev->hbuf_is_ready) { 1145 /* get the real register value */ 1146 dev->hbuf_is_ready = mei_hbuf_is_ready(dev); 1147 rets = mei_irq_write_handler(dev, &complete_list); 1148 if (rets && rets != -EMSGSIZE) 1149 dev_err(dev->dev, "mei_irq_write_handler ret = %d.\n", 1150 rets); 1151 dev->hbuf_is_ready = mei_hbuf_is_ready(dev); 1152 } 1153 1154 mei_irq_compl_handler(dev, &complete_list); 1155 1156 end: 1157 dev_dbg(dev->dev, "interrupt thread end ret = %d\n", rets); 1158 1159 mutex_unlock(&dev->device_lock); 1160 1161 mei_enable_interrupts(dev); 1162 return IRQ_HANDLED; 1163 } 1164 1165 static const struct mei_hw_ops mei_txe_hw_ops = { 1166 1167 .host_is_ready = mei_txe_host_is_ready, 1168 1169 .fw_status = mei_txe_fw_status, 1170 .pg_state = mei_txe_pg_state, 1171 1172 .hw_is_ready = mei_txe_hw_is_ready, 1173 .hw_reset = mei_txe_hw_reset, 1174 .hw_config = mei_txe_hw_config, 1175 .hw_start = mei_txe_hw_start, 1176 1177 .pg_in_transition = mei_txe_pg_in_transition, 1178 .pg_is_enabled = mei_txe_pg_is_enabled, 1179 1180 .intr_clear = mei_txe_intr_clear, 1181 .intr_enable = mei_txe_intr_enable, 1182 .intr_disable = mei_txe_intr_disable, 1183 .synchronize_irq = mei_txe_synchronize_irq, 1184 1185 .hbuf_free_slots = mei_txe_hbuf_empty_slots, 1186 .hbuf_is_ready = mei_txe_is_input_ready, 1187 .hbuf_max_len = mei_txe_hbuf_max_len, 1188 1189 .write = mei_txe_write, 1190 1191 .rdbuf_full_slots = mei_txe_count_full_read_slots, 1192 .read_hdr = mei_txe_read_hdr, 1193 1194 .read = mei_txe_read, 1195 1196 }; 1197 1198 /** 1199 * mei_txe_dev_init - allocates and initializes txe hardware specific structure 1200 * 1201 * @pdev: pci device 1202 * 1203 * Return: struct mei_device * on success or NULL 1204 */ 1205 struct mei_device *mei_txe_dev_init(struct pci_dev *pdev) 1206 { 1207 struct mei_device *dev; 1208 struct mei_txe_hw *hw; 1209 1210 dev = kzalloc(sizeof(struct mei_device) + 1211 sizeof(struct mei_txe_hw), GFP_KERNEL); 1212 if (!dev) 1213 return NULL; 1214 1215 mei_device_init(dev, &pdev->dev, &mei_txe_hw_ops); 1216 1217 hw = to_txe_hw(dev); 1218 1219 init_waitqueue_head(&hw->wait_aliveness_resp); 1220 1221 return dev; 1222 } 1223 1224 /** 1225 * mei_txe_setup_satt2 - SATT2 configuration for DMA support. 1226 * 1227 * @dev: the device structure 1228 * @addr: physical address start of the range 1229 * @range: physical range size 1230 * 1231 * Return: 0 on success an error code otherwise 1232 */ 1233 int mei_txe_setup_satt2(struct mei_device *dev, phys_addr_t addr, u32 range) 1234 { 1235 struct mei_txe_hw *hw = to_txe_hw(dev); 1236 1237 u32 lo32 = lower_32_bits(addr); 1238 u32 hi32 = upper_32_bits(addr); 1239 u32 ctrl; 1240 1241 /* SATT is limited to 36 Bits */ 1242 if (hi32 & ~0xF) 1243 return -EINVAL; 1244 1245 /* SATT has to be 16Byte aligned */ 1246 if (lo32 & 0xF) 1247 return -EINVAL; 1248 1249 /* SATT range has to be 4Bytes aligned */ 1250 if (range & 0x4) 1251 return -EINVAL; 1252 1253 /* SATT is limited to 32 MB range*/ 1254 if (range > SATT_RANGE_MAX) 1255 return -EINVAL; 1256 1257 ctrl = SATT2_CTRL_VALID_MSK; 1258 ctrl |= hi32 << SATT2_CTRL_BR_BASE_ADDR_REG_SHIFT; 1259 1260 mei_txe_br_reg_write(hw, SATT2_SAP_SIZE_REG, range); 1261 mei_txe_br_reg_write(hw, SATT2_BRG_BA_LSB_REG, lo32); 1262 mei_txe_br_reg_write(hw, SATT2_CTRL_REG, ctrl); 1263 dev_dbg(dev->dev, "SATT2: SAP_SIZE_OFFSET=0x%08X, BRG_BA_LSB_OFFSET=0x%08X, CTRL_OFFSET=0x%08X\n", 1264 range, lo32, ctrl); 1265 1266 return 0; 1267 } 1268