drivers/misc/mei/hw-me.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
   4  * Intel Management Engine Interface (Intel MEI) Linux driver
   5  */
   6
   7 #include <linux/pci.h>
   8
   9 #include <linux/kthread.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/pm_runtime.h>
  12 #include <linux/sizes.h>
  13
  14 #include "mei_dev.h"
  15 #include "hbm.h"
  16
  17 #include "hw-me.h"
  18 #include "hw-me-regs.h"
  19
  20 #include "mei-trace.h"
  21
  22 /**
  23  * mei_me_reg_read - Reads 32bit data from the mei device
  24  *
  25  * @hw: the me hardware structure
  26  * @offset: offset from which to read the data
  27  *
  28  * Return: register value (u32)
  29  */
  30 static inline u32 mei_me_reg_read(const struct mei_me_hw *hw,
  31                                unsigned long offset)
  32 {
  33         return ioread32(hw->mem_addr + offset);
  34 }
  35
  36
  37 /**
  38  * mei_me_reg_write - Writes 32bit data to the mei device
  39  *
  40  * @hw: the me hardware structure
  41  * @offset: offset from which to write the data
  42  * @value: register value to write (u32)
  43  */
  44 static inline void mei_me_reg_write(const struct mei_me_hw *hw,
  45                                  unsigned long offset, u32 value)
  46 {
  47         iowrite32(value, hw->mem_addr + offset);
  48 }
  49
  50 /**
  51  * mei_me_mecbrw_read - Reads 32bit data from ME circular buffer
  52  *  read window register
  53  *
  54  * @dev: the device structure
  55  *
  56  * Return: ME_CB_RW register value (u32)
  57  */
  58 static inline u32 mei_me_mecbrw_read(const struct mei_device *dev)
  59 {
  60         return mei_me_reg_read(to_me_hw(dev), ME_CB_RW);
  61 }
  62
  63 /**
  64  * mei_me_hcbww_write - write 32bit data to the host circular buffer
  65  *
  66  * @dev: the device structure
  67  * @data: 32bit data to be written to the host circular buffer
  68  */
  69 static inline void mei_me_hcbww_write(struct mei_device *dev, u32 data)
  70 {
  71         mei_me_reg_write(to_me_hw(dev), H_CB_WW, data);
  72 }
  73
  74 /**
  75  * mei_me_mecsr_read - Reads 32bit data from the ME CSR
  76  *
  77  * @dev: the device structure
  78  *
  79  * Return: ME_CSR_HA register value (u32)
  80  */
  81 static inline u32 mei_me_mecsr_read(const struct mei_device *dev)
  82 {
  83         u32 reg;
  84
  85         reg = mei_me_reg_read(to_me_hw(dev), ME_CSR_HA);
  86         trace_mei_reg_read(dev->dev, "ME_CSR_HA", ME_CSR_HA, reg);
  87
  88         return reg;
  89 }
  90
  91 /**
  92  * mei_hcsr_read - Reads 32bit data from the host CSR
  93  *
  94  * @dev: the device structure
  95  *
  96  * Return: H_CSR register value (u32)
  97  */
  98 static inline u32 mei_hcsr_read(const struct mei_device *dev)
  99 {
 100         u32 reg;
 101
 102         reg = mei_me_reg_read(to_me_hw(dev), H_CSR);
 103         trace_mei_reg_read(dev->dev, "H_CSR", H_CSR, reg);
 104
 105         return reg;
 106 }
 107
 108 /**
 109  * mei_hcsr_write - writes H_CSR register to the mei device
 110  *
 111  * @dev: the device structure
 112  * @reg: new register value
 113  */
 114 static inline void mei_hcsr_write(struct mei_device *dev, u32 reg)
 115 {
 116         trace_mei_reg_write(dev->dev, "H_CSR", H_CSR, reg);
 117         mei_me_reg_write(to_me_hw(dev), H_CSR, reg);
 118 }
 119
 120 /**
 121  * mei_hcsr_set - writes H_CSR register to the mei device,
 122  * and ignores the H_IS bit for it is write-one-to-zero.
 123  *
 124  * @dev: the device structure
 125  * @reg: new register value
 126  */
 127 static inline void mei_hcsr_set(struct mei_device *dev, u32 reg)
 128 {
 129         reg &= ~H_CSR_IS_MASK;
 130         mei_hcsr_write(dev, reg);
 131 }
 132
 133 /**
 134  * mei_hcsr_set_hig - set host interrupt (set H_IG)
 135  *
 136  * @dev: the device structure
 137  */
 138 static inline void mei_hcsr_set_hig(struct mei_device *dev)
 139 {
 140         u32 hcsr;
 141
 142         hcsr = mei_hcsr_read(dev) | H_IG;
 143         mei_hcsr_set(dev, hcsr);
 144 }
 145
 146 /**
 147  * mei_me_d0i3c_read - Reads 32bit data from the D0I3C register
 148  *
 149  * @dev: the device structure
 150  *
 151  * Return: H_D0I3C register value (u32)
 152  */
 153 static inline u32 mei_me_d0i3c_read(const struct mei_device *dev)
 154 {
 155         u32 reg;
 156
 157         reg = mei_me_reg_read(to_me_hw(dev), H_D0I3C);
 158         trace_mei_reg_read(dev->dev, "H_D0I3C", H_D0I3C, reg);
 159
 160         return reg;
 161 }
 162
 163 /**
 164  * mei_me_d0i3c_write - writes H_D0I3C register to device
 165  *
 166  * @dev: the device structure
 167  * @reg: new register value
 168  */
 169 static inline void mei_me_d0i3c_write(struct mei_device *dev, u32 reg)
 170 {
 171         trace_mei_reg_write(dev->dev, "H_D0I3C", H_D0I3C, reg);
 172         mei_me_reg_write(to_me_hw(dev), H_D0I3C, reg);
 173 }
 174
 175 /**
 176  * mei_me_trc_status - read trc status register
 177  *
 178  * @dev: mei device
 179  * @trc: trc status register value
 180  *
 181  * Return: 0 on success, error otherwise
 182  */
 183 static int mei_me_trc_status(struct mei_device *dev, u32 *trc)
 184 {
 185         struct mei_me_hw *hw = to_me_hw(dev);
 186
 187         if (!hw->cfg->hw_trc_supported)
 188                 return -EOPNOTSUPP;
 189
 190         *trc = mei_me_reg_read(hw, ME_TRC);
 191         trace_mei_reg_read(dev->dev, "ME_TRC", ME_TRC, *trc);
 192
 193         return 0;
 194 }
 195
 196 /**
 197  * mei_me_fw_status - read fw status register from pci config space
 198  *
 199  * @dev: mei device
 200  * @fw_status: fw status register values
 201  *
 202  * Return: 0 on success, error otherwise
 203  */
 204 static int mei_me_fw_status(struct mei_device *dev,
 205                             struct mei_fw_status *fw_status)
 206 {
 207         struct mei_me_hw *hw = to_me_hw(dev);
 208         const struct mei_fw_status *fw_src = &hw->cfg->fw_status;
 209         int ret;
 210         int i;
 211
 212         if (!fw_status || !hw->read_fws)
 213                 return -EINVAL;
 214
 215         fw_status->count = fw_src->count;
 216         for (i = 0; i < fw_src->count && i < MEI_FW_STATUS_MAX; i++) {
 217                 ret = hw->read_fws(dev, fw_src->status[i],
 218                                    &fw_status->status[i]);
 219                 trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HFS_X",
 220                                        fw_src->status[i],
 221                                        fw_status->status[i]);
 222                 if (ret)
 223                         return ret;
 224         }
 225
 226         return 0;
 227 }
 228
 229 /**
 230  * mei_me_hw_config - configure hw dependent settings
 231  *
 232  * @dev: mei device
 233  *
 234  * Return:
 235  *  * -EINVAL when read_fws is not set
 236  *  * 0 on success
 237  *
 238  */
 239 static int mei_me_hw_config(struct mei_device *dev)
 240 {
 241         struct mei_me_hw *hw = to_me_hw(dev);
 242         u32 hcsr, reg;
 243
 244         if (WARN_ON(!hw->read_fws))
 245                 return -EINVAL;
 246
 247         /* Doesn't change in runtime */
 248         hcsr = mei_hcsr_read(dev);
 249         hw->hbuf_depth = (hcsr & H_CBD) >> 24;
 250
 251         reg = 0;
 252         hw->read_fws(dev, PCI_CFG_HFS_1, &reg);
 253         trace_mei_pci_cfg_read(dev->dev, "PCI_CFG_HFS_1", PCI_CFG_HFS_1, reg);
 254         hw->d0i3_supported =
 255                 ((reg & PCI_CFG_HFS_1_D0I3_MSK) == PCI_CFG_HFS_1_D0I3_MSK);
 256
 257         hw->pg_state = MEI_PG_OFF;
 258         if (hw->d0i3_supported) {
 259                 reg = mei_me_d0i3c_read(dev);
 260                 if (reg & H_D0I3C_I3)
 261                         hw->pg_state = MEI_PG_ON;
 262         }
 263
 264         return 0;
 265 }
 266
 267 /**
 268  * mei_me_pg_state  - translate internal pg state
 269  *   to the mei power gating state
 270  *
 271  * @dev:  mei device
 272  *
 273  * Return: MEI_PG_OFF if aliveness is on and MEI_PG_ON otherwise
 274  */
 275 static inline enum mei_pg_state mei_me_pg_state(struct mei_device *dev)
 276 {
 277         struct mei_me_hw *hw = to_me_hw(dev);
 278
 279         return hw->pg_state;
 280 }
 281
 282 static inline u32 me_intr_src(u32 hcsr)
 283 {
 284         return hcsr & H_CSR_IS_MASK;
 285 }
 286
 287 /**
 288  * me_intr_disable - disables mei device interrupts
 289  *      using supplied hcsr register value.
 290  *
 291  * @dev: the device structure
 292  * @hcsr: supplied hcsr register value
 293  */
 294 static inline void me_intr_disable(struct mei_device *dev, u32 hcsr)
 295 {
 296         hcsr &= ~H_CSR_IE_MASK;
 297         mei_hcsr_set(dev, hcsr);
 298 }
 299
 300 /**
 301  * me_intr_clear - clear and stop interrupts
 302  *
 303  * @dev: the device structure
 304  * @hcsr: supplied hcsr register value
 305  */
 306 static inline void me_intr_clear(struct mei_device *dev, u32 hcsr)
 307 {
 308         if (me_intr_src(hcsr))
 309                 mei_hcsr_write(dev, hcsr);
 310 }
 311
 312 /**
 313  * mei_me_intr_clear - clear and stop interrupts
 314  *
 315  * @dev: the device structure
 316  */
 317 static void mei_me_intr_clear(struct mei_device *dev)
 318 {
 319         u32 hcsr = mei_hcsr_read(dev);
 320
 321         me_intr_clear(dev, hcsr);
 322 }
 323 /**
 324  * mei_me_intr_enable - enables mei device interrupts
 325  *
 326  * @dev: the device structure
 327  */
 328 static void mei_me_intr_enable(struct mei_device *dev)
 329 {
 330         u32 hcsr = mei_hcsr_read(dev);
 331
 332         hcsr |= H_CSR_IE_MASK;
 333         mei_hcsr_set(dev, hcsr);
 334 }
 335
 336 /**
 337  * mei_me_intr_disable - disables mei device interrupts
 338  *
 339  * @dev: the device structure
 340  */
 341 static void mei_me_intr_disable(struct mei_device *dev)
 342 {
 343         u32 hcsr = mei_hcsr_read(dev);
 344
 345         me_intr_disable(dev, hcsr);
 346 }
 347
 348 /**
 349  * mei_me_synchronize_irq - wait for pending IRQ handlers
 350  *
 351  * @dev: the device structure
 352  */
 353 static void mei_me_synchronize_irq(struct mei_device *dev)
 354 {
 355         struct mei_me_hw *hw = to_me_hw(dev);
 356
 357         synchronize_irq(hw->irq);
 358 }
 359
 360 /**
 361  * mei_me_hw_reset_release - release device from the reset
 362  *
 363  * @dev: the device structure
 364  */
 365 static void mei_me_hw_reset_release(struct mei_device *dev)
 366 {
 367         u32 hcsr = mei_hcsr_read(dev);
 368
 369         hcsr |= H_IG;
 370         hcsr &= ~H_RST;
 371         mei_hcsr_set(dev, hcsr);
 372 }
 373
 374 /**
 375  * mei_me_host_set_ready - enable device
 376  *
 377  * @dev: mei device
 378  */
 379 static void mei_me_host_set_ready(struct mei_device *dev)
 380 {
 381         u32 hcsr = mei_hcsr_read(dev);
 382
 383         hcsr |= H_CSR_IE_MASK | H_IG | H_RDY;
 384         mei_hcsr_set(dev, hcsr);
 385 }
 386
 387 /**
 388  * mei_me_host_is_ready - check whether the host has turned ready
 389  *
 390  * @dev: mei device
 391  * Return: bool
 392  */
 393 static bool mei_me_host_is_ready(struct mei_device *dev)
 394 {
 395         u32 hcsr = mei_hcsr_read(dev);
 396
 397         return (hcsr & H_RDY) == H_RDY;
 398 }
 399
 400 /**
 401  * mei_me_hw_is_ready - check whether the me(hw) has turned ready
 402  *
 403  * @dev: mei device
 404  * Return: bool
 405  */
 406 static bool mei_me_hw_is_ready(struct mei_device *dev)
 407 {
 408         u32 mecsr = mei_me_mecsr_read(dev);
 409
 410         return (mecsr & ME_RDY_HRA) == ME_RDY_HRA;
 411 }
 412
 413 /**
 414  * mei_me_hw_is_resetting - check whether the me(hw) is in reset
 415  *
 416  * @dev: mei device
 417  * Return: bool
 418  */
 419 static bool mei_me_hw_is_resetting(struct mei_device *dev)
 420 {
 421         u32 mecsr = mei_me_mecsr_read(dev);
 422
 423         return (mecsr & ME_RST_HRA) == ME_RST_HRA;
 424 }
 425
 426 /**
 427  * mei_me_hw_ready_wait - wait until the me(hw) has turned ready
 428  *  or timeout is reached
 429  *
 430  * @dev: mei device
 431  * Return: 0 on success, error otherwise
 432  */
 433 static int mei_me_hw_ready_wait(struct mei_device *dev)
 434 {
 435         mutex_unlock(&dev->device_lock);
 436         wait_event_timeout(dev->wait_hw_ready,
 437                         dev->recvd_hw_ready,
 438                         mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT));
 439         mutex_lock(&dev->device_lock);
 440         if (!dev->recvd_hw_ready) {
 441                 dev_err(dev->dev, "wait hw ready failed\n");
 442                 return -ETIME;
 443         }
 444
 445         mei_me_hw_reset_release(dev);
 446         dev->recvd_hw_ready = false;
 447         return 0;
 448 }
 449
 450 /**
 451  * mei_me_hw_start - hw start routine
 452  *
 453  * @dev: mei device
 454  * Return: 0 on success, error otherwise
 455  */
 456 static int mei_me_hw_start(struct mei_device *dev)
 457 {
 458         int ret = mei_me_hw_ready_wait(dev);
 459
 460         if (ret)
 461                 return ret;
 462         dev_dbg(dev->dev, "hw is ready\n");
 463
 464         mei_me_host_set_ready(dev);
 465         return ret;
 466 }
 467
 468
 469 /**
 470  * mei_hbuf_filled_slots - gets number of device filled buffer slots
 471  *
 472  * @dev: the device structure
 473  *
 474  * Return: number of filled slots
 475  */
 476 static unsigned char mei_hbuf_filled_slots(struct mei_device *dev)
 477 {
 478         u32 hcsr;
 479         char read_ptr, write_ptr;
 480
 481         hcsr = mei_hcsr_read(dev);
 482
 483         read_ptr = (char) ((hcsr & H_CBRP) >> 8);
 484         write_ptr = (char) ((hcsr & H_CBWP) >> 16);
 485
 486         return (unsigned char) (write_ptr - read_ptr);
 487 }
 488
 489 /**
 490  * mei_me_hbuf_is_empty - checks if host buffer is empty.
 491  *
 492  * @dev: the device structure
 493  *
 494  * Return: true if empty, false - otherwise.
 495  */
 496 static bool mei_me_hbuf_is_empty(struct mei_device *dev)
 497 {
 498         return mei_hbuf_filled_slots(dev) == 0;
 499 }
 500
 501 /**
 502  * mei_me_hbuf_empty_slots - counts write empty slots.
 503  *
 504  * @dev: the device structure
 505  *
 506  * Return: -EOVERFLOW if overflow, otherwise empty slots count
 507  */
 508 static int mei_me_hbuf_empty_slots(struct mei_device *dev)
 509 {
 510         struct mei_me_hw *hw = to_me_hw(dev);
 511         unsigned char filled_slots, empty_slots;
 512
 513         filled_slots = mei_hbuf_filled_slots(dev);
 514         empty_slots = hw->hbuf_depth - filled_slots;
 515
 516         /* check for overflow */
 517         if (filled_slots > hw->hbuf_depth)
 518                 return -EOVERFLOW;
 519
 520         return empty_slots;
 521 }
 522
 523 /**
 524  * mei_me_hbuf_depth - returns depth of the hw buffer.
 525  *
 526  * @dev: the device structure
 527  *
 528  * Return: size of hw buffer in slots
 529  */
 530 static u32 mei_me_hbuf_depth(const struct mei_device *dev)
 531 {
 532         struct mei_me_hw *hw = to_me_hw(dev);
 533
 534         return hw->hbuf_depth;
 535 }
 536
 537 /**
 538  * mei_me_hbuf_write - writes a message to host hw buffer.
 539  *
 540  * @dev: the device structure
 541  * @hdr: header of message
 542  * @hdr_len: header length in bytes: must be multiplication of a slot (4bytes)
 543  * @data: payload
 544  * @data_len: payload length in bytes
 545  *
 546  * Return: 0 if success, < 0 - otherwise.
 547  */
 548 static int mei_me_hbuf_write(struct mei_device *dev,
 549                              const void *hdr, size_t hdr_len,
 550                              const void *data, size_t data_len)
 551 {
 552         unsigned long rem;
 553         unsigned long i;
 554         const u32 *reg_buf;
 555         u32 dw_cnt;
 556         int empty_slots;
 557
 558         if (WARN_ON(!hdr || !data || hdr_len & 0x3))
 559                 return -EINVAL;
 560
 561         dev_dbg(dev->dev, MEI_HDR_FMT, MEI_HDR_PRM((struct mei_msg_hdr *)hdr));
 562
 563         empty_slots = mei_hbuf_empty_slots(dev);
 564         dev_dbg(dev->dev, "empty slots = %hu.\n", empty_slots);
 565
 566         if (empty_slots < 0)
 567                 return -EOVERFLOW;
 568
 569         dw_cnt = mei_data2slots(hdr_len + data_len);
 570         if (dw_cnt > (u32)empty_slots)
 571                 return -EMSGSIZE;
 572
 573         reg_buf = hdr;
 574         for (i = 0; i < hdr_len / MEI_SLOT_SIZE; i++)
 575                 mei_me_hcbww_write(dev, reg_buf[i]);
 576
 577         reg_buf = data;
 578         for (i = 0; i < data_len / MEI_SLOT_SIZE; i++)
 579                 mei_me_hcbww_write(dev, reg_buf[i]);
 580
 581         rem = data_len & 0x3;
 582         if (rem > 0) {
 583                 u32 reg = 0;
 584
 585                 memcpy(&reg, (const u8 *)data + data_len - rem, rem);
 586                 mei_me_hcbww_write(dev, reg);
 587         }
 588
 589         mei_hcsr_set_hig(dev);
 590         if (!mei_me_hw_is_ready(dev))
 591                 return -EIO;
 592
 593         return 0;
 594 }
 595
 596 /**
 597  * mei_me_count_full_read_slots - counts read full slots.
 598  *
 599  * @dev: the device structure
 600  *
 601  * Return: -EOVERFLOW if overflow, otherwise filled slots count
 602  */
 603 static int mei_me_count_full_read_slots(struct mei_device *dev)
 604 {
 605         u32 me_csr;
 606         char read_ptr, write_ptr;
 607         unsigned char buffer_depth, filled_slots;
 608
 609         me_csr = mei_me_mecsr_read(dev);
 610         buffer_depth = (unsigned char)((me_csr & ME_CBD_HRA) >> 24);
 611         read_ptr = (char) ((me_csr & ME_CBRP_HRA) >> 8);
 612         write_ptr = (char) ((me_csr & ME_CBWP_HRA) >> 16);
 613         filled_slots = (unsigned char) (write_ptr - read_ptr);
 614
 615         /* check for overflow */
 616         if (filled_slots > buffer_depth)
 617                 return -EOVERFLOW;
 618
 619         dev_dbg(dev->dev, "filled_slots =%08x\n", filled_slots);
 620         return (int)filled_slots;
 621 }
 622
 623 /**
 624  * mei_me_read_slots - reads a message from mei device.
 625  *
 626  * @dev: the device structure
 627  * @buffer: message buffer will be written
 628  * @buffer_length: message size will be read
 629  *
 630  * Return: always 0
 631  */
 632 static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer,
 633                              unsigned long buffer_length)
 634 {
 635         u32 *reg_buf = (u32 *)buffer;
 636
 637         for (; buffer_length >= MEI_SLOT_SIZE; buffer_length -= MEI_SLOT_SIZE)
 638                 *reg_buf++ = mei_me_mecbrw_read(dev);
 639
 640         if (buffer_length > 0) {
 641                 u32 reg = mei_me_mecbrw_read(dev);
 642
 643                 memcpy(reg_buf, &reg, buffer_length);
 644         }
 645
 646         mei_hcsr_set_hig(dev);
 647         return 0;
 648 }
 649
 650 /**
 651  * mei_me_pg_set - write pg enter register
 652  *
 653  * @dev: the device structure
 654  */
 655 static void mei_me_pg_set(struct mei_device *dev)
 656 {
 657         struct mei_me_hw *hw = to_me_hw(dev);
 658         u32 reg;
 659
 660         reg = mei_me_reg_read(hw, H_HPG_CSR);
 661         trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
 662
 663         reg |= H_HPG_CSR_PGI;
 664
 665         trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
 666         mei_me_reg_write(hw, H_HPG_CSR, reg);
 667 }
 668
 669 /**
 670  * mei_me_pg_unset - write pg exit register
 671  *
 672  * @dev: the device structure
 673  */
 674 static void mei_me_pg_unset(struct mei_device *dev)
 675 {
 676         struct mei_me_hw *hw = to_me_hw(dev);
 677         u32 reg;
 678
 679         reg = mei_me_reg_read(hw, H_HPG_CSR);
 680         trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
 681
 682         WARN(!(reg & H_HPG_CSR_PGI), "PGI is not set\n");
 683
 684         reg |= H_HPG_CSR_PGIHEXR;
 685
 686         trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
 687         mei_me_reg_write(hw, H_HPG_CSR, reg);
 688 }
 689
 690 /**
 691  * mei_me_pg_legacy_enter_sync - perform legacy pg entry procedure
 692  *
 693  * @dev: the device structure
 694  *
 695  * Return: 0 on success an error code otherwise
 696  */
 697 static int mei_me_pg_legacy_enter_sync(struct mei_device *dev)
 698 {
 699         struct mei_me_hw *hw = to_me_hw(dev);
 700         unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
 701         int ret;
 702
 703         dev->pg_event = MEI_PG_EVENT_WAIT;
 704
 705         ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_ENTRY_REQ_CMD);
 706         if (ret)
 707                 return ret;
 708
 709         mutex_unlock(&dev->device_lock);
 710         wait_event_timeout(dev->wait_pg,
 711                 dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout);
 712         mutex_lock(&dev->device_lock);
 713
 714         if (dev->pg_event == MEI_PG_EVENT_RECEIVED) {
 715                 mei_me_pg_set(dev);
 716                 ret = 0;
 717         } else {
 718                 ret = -ETIME;
 719         }
 720
 721         dev->pg_event = MEI_PG_EVENT_IDLE;
 722         hw->pg_state = MEI_PG_ON;
 723
 724         return ret;
 725 }
 726
 727 /**
 728  * mei_me_pg_legacy_exit_sync - perform legacy pg exit procedure
 729  *
 730  * @dev: the device structure
 731  *
 732  * Return: 0 on success an error code otherwise
 733  */
 734 static int mei_me_pg_legacy_exit_sync(struct mei_device *dev)
 735 {
 736         struct mei_me_hw *hw = to_me_hw(dev);
 737         unsigned long timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
 738         int ret;
 739
 740         if (dev->pg_event == MEI_PG_EVENT_RECEIVED)
 741                 goto reply;
 742
 743         dev->pg_event = MEI_PG_EVENT_WAIT;
 744
 745         mei_me_pg_unset(dev);
 746
 747         mutex_unlock(&dev->device_lock);
 748         wait_event_timeout(dev->wait_pg,
 749                 dev->pg_event == MEI_PG_EVENT_RECEIVED, timeout);
 750         mutex_lock(&dev->device_lock);
 751
 752 reply:
 753         if (dev->pg_event != MEI_PG_EVENT_RECEIVED) {
 754                 ret = -ETIME;
 755                 goto out;
 756         }
 757
 758         dev->pg_event = MEI_PG_EVENT_INTR_WAIT;
 759         ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_EXIT_RES_CMD);
 760         if (ret)
 761                 return ret;
 762
 763         mutex_unlock(&dev->device_lock);
 764         wait_event_timeout(dev->wait_pg,
 765                 dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, timeout);
 766         mutex_lock(&dev->device_lock);
 767
 768         if (dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED)
 769                 ret = 0;
 770         else
 771                 ret = -ETIME;
 772
 773 out:
 774         dev->pg_event = MEI_PG_EVENT_IDLE;
 775         hw->pg_state = MEI_PG_OFF;
 776
 777         return ret;
 778 }
 779
 780 /**
 781  * mei_me_pg_in_transition - is device now in pg transition
 782  *
 783  * @dev: the device structure
 784  *
 785  * Return: true if in pg transition, false otherwise
 786  */
 787 static bool mei_me_pg_in_transition(struct mei_device *dev)
 788 {
 789         return dev->pg_event >= MEI_PG_EVENT_WAIT &&
 790                dev->pg_event <= MEI_PG_EVENT_INTR_WAIT;
 791 }
 792
 793 /**
 794  * mei_me_pg_is_enabled - detect if PG is supported by HW
 795  *
 796  * @dev: the device structure
 797  *
 798  * Return: true is pg supported, false otherwise
 799  */
 800 static bool mei_me_pg_is_enabled(struct mei_device *dev)
 801 {
 802         struct mei_me_hw *hw = to_me_hw(dev);
 803         u32 reg = mei_me_mecsr_read(dev);
 804
 805         if (hw->d0i3_supported)
 806                 return true;
 807
 808         if ((reg & ME_PGIC_HRA) == 0)
 809                 goto notsupported;
 810
 811         if (!dev->hbm_f_pg_supported)
 812                 goto notsupported;
 813
 814         return true;
 815
 816 notsupported:
 817         dev_dbg(dev->dev, "pg: not supported: d0i3 = %d HGP = %d hbm version %d.%d ?= %d.%d\n",
 818                 hw->d0i3_supported,
 819                 !!(reg & ME_PGIC_HRA),
 820                 dev->version.major_version,
 821                 dev->version.minor_version,
 822                 HBM_MAJOR_VERSION_PGI,
 823                 HBM_MINOR_VERSION_PGI);
 824
 825         return false;
 826 }
 827
 828 /**
 829  * mei_me_d0i3_set - write d0i3 register bit on mei device.
 830  *
 831  * @dev: the device structure
 832  * @intr: ask for interrupt
 833  *
 834  * Return: D0I3C register value
 835  */
 836 static u32 mei_me_d0i3_set(struct mei_device *dev, bool intr)
 837 {
 838         u32 reg = mei_me_d0i3c_read(dev);
 839
 840         reg |= H_D0I3C_I3;
 841         if (intr)
 842                 reg |= H_D0I3C_IR;
 843         else
 844                 reg &= ~H_D0I3C_IR;
 845         mei_me_d0i3c_write(dev, reg);
 846         /* read it to ensure HW consistency */
 847         reg = mei_me_d0i3c_read(dev);
 848         return reg;
 849 }
 850
 851 /**
 852  * mei_me_d0i3_unset - clean d0i3 register bit on mei device.
 853  *
 854  * @dev: the device structure
 855  *
 856  * Return: D0I3C register value
 857  */
 858 static u32 mei_me_d0i3_unset(struct mei_device *dev)
 859 {
 860         u32 reg = mei_me_d0i3c_read(dev);
 861
 862         reg &= ~H_D0I3C_I3;
 863         reg |= H_D0I3C_IR;
 864         mei_me_d0i3c_write(dev, reg);
 865         /* read it to ensure HW consistency */
 866         reg = mei_me_d0i3c_read(dev);
 867         return reg;
 868 }
 869
 870 /**
 871  * mei_me_d0i3_enter_sync - perform d0i3 entry procedure
 872  *
 873  * @dev: the device structure
 874  *
 875  * Return: 0 on success an error code otherwise
 876  */
 877 static int mei_me_d0i3_enter_sync(struct mei_device *dev)
 878 {
 879         struct mei_me_hw *hw = to_me_hw(dev);
 880         unsigned long d0i3_timeout = mei_secs_to_jiffies(MEI_D0I3_TIMEOUT);
 881         unsigned long pgi_timeout = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
 882         int ret;
 883         u32 reg;
 884
 885         reg = mei_me_d0i3c_read(dev);
 886         if (reg & H_D0I3C_I3) {
 887                 /* we are in d0i3, nothing to do */
 888                 dev_dbg(dev->dev, "d0i3 set not needed\n");
 889                 ret = 0;
 890                 goto on;
 891         }
 892
 893         /* PGI entry procedure */
 894         dev->pg_event = MEI_PG_EVENT_WAIT;
 895
 896         ret = mei_hbm_pg(dev, MEI_PG_ISOLATION_ENTRY_REQ_CMD);
 897         if (ret)
 898                 /* FIXME: should we reset here? */
 899                 goto out;
 900
 901         mutex_unlock(&dev->device_lock);
 902         wait_event_timeout(dev->wait_pg,
 903                 dev->pg_event == MEI_PG_EVENT_RECEIVED, pgi_timeout);
 904         mutex_lock(&dev->device_lock);
 905
 906         if (dev->pg_event != MEI_PG_EVENT_RECEIVED) {
 907                 ret = -ETIME;
 908                 goto out;
 909         }
 910         /* end PGI entry procedure */
 911
 912         dev->pg_event = MEI_PG_EVENT_INTR_WAIT;
 913
 914         reg = mei_me_d0i3_set(dev, true);
 915         if (!(reg & H_D0I3C_CIP)) {
 916                 dev_dbg(dev->dev, "d0i3 enter wait not needed\n");
 917                 ret = 0;
 918                 goto on;
 919         }
 920
 921         mutex_unlock(&dev->device_lock);
 922         wait_event_timeout(dev->wait_pg,
 923                 dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, d0i3_timeout);
 924         mutex_lock(&dev->device_lock);
 925
 926         if (dev->pg_event != MEI_PG_EVENT_INTR_RECEIVED) {
 927                 reg = mei_me_d0i3c_read(dev);
 928                 if (!(reg & H_D0I3C_I3)) {
 929                         ret = -ETIME;
 930                         goto out;
 931                 }
 932         }
 933
 934         ret = 0;
 935 on:
 936         hw->pg_state = MEI_PG_ON;
 937 out:
 938         dev->pg_event = MEI_PG_EVENT_IDLE;
 939         dev_dbg(dev->dev, "d0i3 enter ret = %d\n", ret);
 940         return ret;
 941 }
 942
 943 /**
 944  * mei_me_d0i3_enter - perform d0i3 entry procedure
 945  *   no hbm PG handshake
 946  *   no waiting for confirmation; runs with interrupts
 947  *   disabled
 948  *
 949  * @dev: the device structure
 950  *
 951  * Return: 0 on success an error code otherwise
 952  */
 953 static int mei_me_d0i3_enter(struct mei_device *dev)
 954 {
 955         struct mei_me_hw *hw = to_me_hw(dev);
 956         u32 reg;
 957
 958         reg = mei_me_d0i3c_read(dev);
 959         if (reg & H_D0I3C_I3) {
 960                 /* we are in d0i3, nothing to do */
 961                 dev_dbg(dev->dev, "already d0i3 : set not needed\n");
 962                 goto on;
 963         }
 964
 965         mei_me_d0i3_set(dev, false);
 966 on:
 967         hw->pg_state = MEI_PG_ON;
 968         dev->pg_event = MEI_PG_EVENT_IDLE;
 969         dev_dbg(dev->dev, "d0i3 enter\n");
 970         return 0;
 971 }
 972
 973 /**
 974  * mei_me_d0i3_exit_sync - perform d0i3 exit procedure
 975  *
 976  * @dev: the device structure
 977  *
 978  * Return: 0 on success an error code otherwise
 979  */
 980 static int mei_me_d0i3_exit_sync(struct mei_device *dev)
 981 {
 982         struct mei_me_hw *hw = to_me_hw(dev);
 983         unsigned long timeout = mei_secs_to_jiffies(MEI_D0I3_TIMEOUT);
 984         int ret;
 985         u32 reg;
 986
 987         dev->pg_event = MEI_PG_EVENT_INTR_WAIT;
 988
 989         reg = mei_me_d0i3c_read(dev);
 990         if (!(reg & H_D0I3C_I3)) {
 991                 /* we are not in d0i3, nothing to do */
 992                 dev_dbg(dev->dev, "d0i3 exit not needed\n");
 993                 ret = 0;
 994                 goto off;
 995         }
 996
 997         reg = mei_me_d0i3_unset(dev);
 998         if (!(reg & H_D0I3C_CIP)) {
 999                 dev_dbg(dev->dev, "d0i3 exit wait not needed\n");
1000                 ret = 0;
1001                 goto off;
1002         }
1003
1004         mutex_unlock(&dev->device_lock);
1005         wait_event_timeout(dev->wait_pg,
1006                 dev->pg_event == MEI_PG_EVENT_INTR_RECEIVED, timeout);
1007         mutex_lock(&dev->device_lock);
1008
1009         if (dev->pg_event != MEI_PG_EVENT_INTR_RECEIVED) {
1010                 reg = mei_me_d0i3c_read(dev);
1011                 if (reg & H_D0I3C_I3) {
1012                         ret = -ETIME;
1013                         goto out;
1014                 }
1015         }
1016
1017         ret = 0;
1018 off:
1019         hw->pg_state = MEI_PG_OFF;
1020 out:
1021         dev->pg_event = MEI_PG_EVENT_IDLE;
1022
1023         dev_dbg(dev->dev, "d0i3 exit ret = %d\n", ret);
1024         return ret;
1025 }
1026
1027 /**
1028  * mei_me_pg_legacy_intr - perform legacy pg processing
1029  *                         in interrupt thread handler
1030  *
1031  * @dev: the device structure
1032  */
1033 static void mei_me_pg_legacy_intr(struct mei_device *dev)
1034 {
1035         struct mei_me_hw *hw = to_me_hw(dev);
1036
1037         if (dev->pg_event != MEI_PG_EVENT_INTR_WAIT)
1038                 return;
1039
1040         dev->pg_event = MEI_PG_EVENT_INTR_RECEIVED;
1041         hw->pg_state = MEI_PG_OFF;
1042         if (waitqueue_active(&dev->wait_pg))
1043                 wake_up(&dev->wait_pg);
1044 }
1045
1046 /**
1047  * mei_me_d0i3_intr - perform d0i3 processing in interrupt thread handler
1048  *
1049  * @dev: the device structure
1050  * @intr_source: interrupt source
1051  */
1052 static void mei_me_d0i3_intr(struct mei_device *dev, u32 intr_source)
1053 {
1054         struct mei_me_hw *hw = to_me_hw(dev);
1055
1056         if (dev->pg_event == MEI_PG_EVENT_INTR_WAIT &&
1057             (intr_source & H_D0I3C_IS)) {
1058                 dev->pg_event = MEI_PG_EVENT_INTR_RECEIVED;
1059                 if (hw->pg_state == MEI_PG_ON) {
1060                         hw->pg_state = MEI_PG_OFF;
1061                         if (dev->hbm_state != MEI_HBM_IDLE) {
1062                                 /*
1063                                  * force H_RDY because it could be
1064                                  * wiped off during PG
1065                                  */
1066                                 dev_dbg(dev->dev, "d0i3 set host ready\n");
1067                                 mei_me_host_set_ready(dev);
1068                         }
1069                 } else {
1070                         hw->pg_state = MEI_PG_ON;
1071                 }
1072
1073                 wake_up(&dev->wait_pg);
1074         }
1075
1076         if (hw->pg_state == MEI_PG_ON && (intr_source & H_IS)) {
1077                 /*
1078                  * HW sent some data and we are in D0i3, so
1079                  * we got here because of HW initiated exit from D0i3.
1080                  * Start runtime pm resume sequence to exit low power state.
1081                  */
1082                 dev_dbg(dev->dev, "d0i3 want resume\n");
1083                 mei_hbm_pg_resume(dev);
1084         }
1085 }
1086
1087 /**
1088  * mei_me_pg_intr - perform pg processing in interrupt thread handler
1089  *
1090  * @dev: the device structure
1091  * @intr_source: interrupt source
1092  */
1093 static void mei_me_pg_intr(struct mei_device *dev, u32 intr_source)
1094 {
1095         struct mei_me_hw *hw = to_me_hw(dev);
1096
1097         if (hw->d0i3_supported)
1098                 mei_me_d0i3_intr(dev, intr_source);
1099         else
1100                 mei_me_pg_legacy_intr(dev);
1101 }
1102
1103 /**
1104  * mei_me_pg_enter_sync - perform runtime pm entry procedure
1105  *
1106  * @dev: the device structure
1107  *
1108  * Return: 0 on success an error code otherwise
1109  */
1110 int mei_me_pg_enter_sync(struct mei_device *dev)
1111 {
1112         struct mei_me_hw *hw = to_me_hw(dev);
1113
1114         if (hw->d0i3_supported)
1115                 return mei_me_d0i3_enter_sync(dev);
1116         else
1117                 return mei_me_pg_legacy_enter_sync(dev);
1118 }
1119
1120 /**
1121  * mei_me_pg_exit_sync - perform runtime pm exit procedure
1122  *
1123  * @dev: the device structure
1124  *
1125  * Return: 0 on success an error code otherwise
1126  */
1127 int mei_me_pg_exit_sync(struct mei_device *dev)
1128 {
1129         struct mei_me_hw *hw = to_me_hw(dev);
1130
1131         if (hw->d0i3_supported)
1132                 return mei_me_d0i3_exit_sync(dev);
1133         else
1134                 return mei_me_pg_legacy_exit_sync(dev);
1135 }
1136
1137 /**
1138  * mei_me_hw_reset - resets fw via mei csr register.
1139  *
1140  * @dev: the device structure
1141  * @intr_enable: if interrupt should be enabled after reset.
1142  *
1143  * Return: 0 on success an error code otherwise
1144  */
1145 static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
1146 {
1147         struct mei_me_hw *hw = to_me_hw(dev);
1148         int ret;
1149         u32 hcsr;
1150
1151         if (intr_enable) {
1152                 mei_me_intr_enable(dev);
1153                 if (hw->d0i3_supported) {
1154                         ret = mei_me_d0i3_exit_sync(dev);
1155                         if (ret)
1156                                 return ret;
1157                 }
1158         }
1159
1160         pm_runtime_set_active(dev->dev);
1161
1162         hcsr = mei_hcsr_read(dev);
1163         /* H_RST may be found lit before reset is started,
1164          * for example if preceding reset flow hasn't completed.
1165          * In that case asserting H_RST will be ignored, therefore
1166          * we need to clean H_RST bit to start a successful reset sequence.
1167          */
1168         if ((hcsr & H_RST) == H_RST) {
1169                 dev_warn(dev->dev, "H_RST is set = 0x%08X", hcsr);
1170                 hcsr &= ~H_RST;
1171                 mei_hcsr_set(dev, hcsr);
1172                 hcsr = mei_hcsr_read(dev);
1173         }
1174
1175         hcsr |= H_RST | H_IG | H_CSR_IS_MASK;
1176
1177         if (!intr_enable)
1178                 hcsr &= ~H_CSR_IE_MASK;
1179
1180         dev->recvd_hw_ready = false;
1181         mei_hcsr_write(dev, hcsr);
1182
1183         /*
1184          * Host reads the H_CSR once to ensure that the
1185          * posted write to H_CSR completes.
1186          */
1187         hcsr = mei_hcsr_read(dev);
1188
1189         if ((hcsr & H_RST) == 0)
1190                 dev_warn(dev->dev, "H_RST is not set = 0x%08X", hcsr);
1191
1192         if ((hcsr & H_RDY) == H_RDY)
1193                 dev_warn(dev->dev, "H_RDY is not cleared 0x%08X", hcsr);
1194
1195         if (!intr_enable) {
1196                 mei_me_hw_reset_release(dev);
1197                 if (hw->d0i3_supported) {
1198                         ret = mei_me_d0i3_enter(dev);
1199                         if (ret)
1200                                 return ret;
1201                 }
1202         }
1203         return 0;
1204 }
1205
1206 /**
1207  * mei_me_irq_quick_handler - The ISR of the MEI device
1208  *
1209  * @irq: The irq number
1210  * @dev_id: pointer to the device structure
1211  *
1212  * Return: irqreturn_t
1213  */
1214 irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id)
1215 {
1216         struct mei_device *dev = (struct mei_device *)dev_id;
1217         u32 hcsr;
1218
1219         hcsr = mei_hcsr_read(dev);
1220         if (!me_intr_src(hcsr))
1221                 return IRQ_NONE;
1222
1223         dev_dbg(dev->dev, "interrupt source 0x%08X\n", me_intr_src(hcsr));
1224
1225         /* disable interrupts on device */
1226         me_intr_disable(dev, hcsr);
1227         return IRQ_WAKE_THREAD;
1228 }
1229
1230 /**
1231  * mei_me_irq_thread_handler - function called after ISR to handle the interrupt
1232  * processing.
1233  *
1234  * @irq: The irq number
1235  * @dev_id: pointer to the device structure
1236  *
1237  * Return: irqreturn_t
1238  *
1239  */
1240 irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
1241 {
1242         struct mei_device *dev = (struct mei_device *) dev_id;
1243         struct list_head cmpl_list;
1244         s32 slots;
1245         u32 hcsr;
1246         int rets = 0;
1247
1248         dev_dbg(dev->dev, "function called after ISR to handle the interrupt processing.\n");
1249         /* initialize our complete list */
1250         mutex_lock(&dev->device_lock);
1251
1252         hcsr = mei_hcsr_read(dev);
1253         me_intr_clear(dev, hcsr);
1254
1255         INIT_LIST_HEAD(&cmpl_list);
1256
1257         /* check if ME wants a reset */
1258         if (!mei_hw_is_ready(dev) && dev->dev_state != MEI_DEV_RESETTING) {
1259                 dev_warn(dev->dev, "FW not ready: resetting.\n");
1260                 schedule_work(&dev->reset_work);
1261                 goto end;
1262         }
1263
1264         if (mei_me_hw_is_resetting(dev))
1265                 mei_hcsr_set_hig(dev);
1266
1267         mei_me_pg_intr(dev, me_intr_src(hcsr));
1268
1269         /*  check if we need to start the dev */
1270         if (!mei_host_is_ready(dev)) {
1271                 if (mei_hw_is_ready(dev)) {
1272                         dev_dbg(dev->dev, "we need to start the dev.\n");
1273                         dev->recvd_hw_ready = true;
1274                         wake_up(&dev->wait_hw_ready);
1275                 } else {
1276                         dev_dbg(dev->dev, "Spurious Interrupt\n");
1277                 }
1278                 goto end;
1279         }
1280         /* check slots available for reading */
1281         slots = mei_count_full_read_slots(dev);
1282         while (slots > 0) {
1283                 dev_dbg(dev->dev, "slots to read = %08x\n", slots);
1284                 rets = mei_irq_read_handler(dev, &cmpl_list, &slots);
1285                 /* There is a race between ME write and interrupt delivery:
1286                  * Not all data is always available immediately after the
1287                  * interrupt, so try to read again on the next interrupt.
1288                  */
1289                 if (rets == -ENODATA)
1290                         break;
1291
1292                 if (rets &&
1293                     (dev->dev_state != MEI_DEV_RESETTING &&
1294                      dev->dev_state != MEI_DEV_POWER_DOWN)) {
1295                         dev_err(dev->dev, "mei_irq_read_handler ret = %d.\n",
1296                                                 rets);
1297                         schedule_work(&dev->reset_work);
1298                         goto end;
1299                 }
1300         }
1301
1302         dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
1303
1304         /*
1305          * During PG handshake only allowed write is the replay to the
1306          * PG exit message, so block calling write function
1307          * if the pg event is in PG handshake
1308          */
1309         if (dev->pg_event != MEI_PG_EVENT_WAIT &&
1310             dev->pg_event != MEI_PG_EVENT_RECEIVED) {
1311                 rets = mei_irq_write_handler(dev, &cmpl_list);
1312                 dev->hbuf_is_ready = mei_hbuf_is_ready(dev);
1313         }
1314
1315         mei_irq_compl_handler(dev, &cmpl_list);
1316
1317 end:
1318         dev_dbg(dev->dev, "interrupt thread end ret = %d\n", rets);
1319         mei_me_intr_enable(dev);
1320         mutex_unlock(&dev->device_lock);
1321         return IRQ_HANDLED;
1322 }
1323
1324 static const struct mei_hw_ops mei_me_hw_ops = {
1325
1326         .trc_status = mei_me_trc_status,
1327         .fw_status = mei_me_fw_status,
1328         .pg_state  = mei_me_pg_state,
1329
1330         .host_is_ready = mei_me_host_is_ready,
1331
1332         .hw_is_ready = mei_me_hw_is_ready,
1333         .hw_reset = mei_me_hw_reset,
1334         .hw_config = mei_me_hw_config,
1335         .hw_start = mei_me_hw_start,
1336
1337         .pg_in_transition = mei_me_pg_in_transition,
1338         .pg_is_enabled = mei_me_pg_is_enabled,
1339
1340         .intr_clear = mei_me_intr_clear,
1341         .intr_enable = mei_me_intr_enable,
1342         .intr_disable = mei_me_intr_disable,
1343         .synchronize_irq = mei_me_synchronize_irq,
1344
1345         .hbuf_free_slots = mei_me_hbuf_empty_slots,
1346         .hbuf_is_ready = mei_me_hbuf_is_empty,
1347         .hbuf_depth = mei_me_hbuf_depth,
1348
1349         .write = mei_me_hbuf_write,
1350
1351         .rdbuf_full_slots = mei_me_count_full_read_slots,
1352         .read_hdr = mei_me_mecbrw_read,
1353         .read = mei_me_read_slots
1354 };
1355
1356 /**
1357  * mei_me_fw_type_nm() - check for nm sku
1358  *
1359  * Read ME FW Status register to check for the Node Manager (NM) Firmware.
1360  * The NM FW is only signaled in PCI function 0.
1361  * __Note__: Deprecated by PCH8 and newer.
1362  *
1363  * @pdev: pci device
1364  *
1365  * Return: true in case of NM firmware
1366  */
1367 static bool mei_me_fw_type_nm(const struct pci_dev *pdev)
1368 {
1369         u32 reg;
1370         unsigned int devfn;
1371
1372         devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
1373         pci_bus_read_config_dword(pdev->bus, devfn, PCI_CFG_HFS_2, &reg);
1374         trace_mei_pci_cfg_read(&pdev->dev, "PCI_CFG_HFS_2", PCI_CFG_HFS_2, reg);
1375         /* make sure that bit 9 (NM) is up and bit 10 (DM) is down */
1376         return (reg & 0x600) == 0x200;
1377 }
1378
1379 #define MEI_CFG_FW_NM                           \
1380         .quirk_probe = mei_me_fw_type_nm
1381
1382 /**
1383  * mei_me_fw_sku_sps_4() - check for sps 4.0 sku
1384  *
1385  * Read ME FW Status register to check for SPS Firmware.
1386  * The SPS FW is only signaled in the PCI function 0.
1387  * __Note__: Deprecated by SPS 5.0 and newer.
1388  *
1389  * @pdev: pci device
1390  *
1391  * Return: true in case of SPS firmware
1392  */
1393 static bool mei_me_fw_type_sps_4(const struct pci_dev *pdev)
1394 {
1395         u32 reg;
1396         unsigned int devfn;
1397
1398         devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
1399         pci_bus_read_config_dword(pdev->bus, devfn, PCI_CFG_HFS_1, &reg);
1400         trace_mei_pci_cfg_read(&pdev->dev, "PCI_CFG_HFS_1", PCI_CFG_HFS_1, reg);
1401         return (reg & PCI_CFG_HFS_1_OPMODE_MSK) == PCI_CFG_HFS_1_OPMODE_SPS;
1402 }
1403
1404 #define MEI_CFG_FW_SPS_4                          \
1405         .quirk_probe = mei_me_fw_type_sps_4
1406
1407 /**
1408  * mei_me_fw_sku_sps() - check for sps sku
1409  *
1410  * Read ME FW Status register to check for SPS Firmware.
1411  * The SPS FW is only signaled in pci function 0
1412  *
1413  * @pdev: pci device
1414  *
1415  * Return: true in case of SPS firmware
1416  */
1417 static bool mei_me_fw_type_sps(const struct pci_dev *pdev)
1418 {
1419         u32 reg;
1420         u32 fw_type;
1421         unsigned int devfn;
1422
1423         devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0);
1424         pci_bus_read_config_dword(pdev->bus, devfn, PCI_CFG_HFS_3, &reg);
1425         trace_mei_pci_cfg_read(&pdev->dev, "PCI_CFG_HFS_3", PCI_CFG_HFS_3, reg);
1426         fw_type = (reg & PCI_CFG_HFS_3_FW_SKU_MSK);
1427
1428         dev_dbg(&pdev->dev, "fw type is %d\n", fw_type);
1429
1430         return fw_type == PCI_CFG_HFS_3_FW_SKU_SPS;
1431 }
1432
1433 #define MEI_CFG_KIND_ITOUCH                     \
1434         .kind = "itouch"
1435
1436 #define MEI_CFG_FW_SPS                          \
1437         .quirk_probe = mei_me_fw_type_sps
1438
1439 #define MEI_CFG_FW_VER_SUPP                     \
1440         .fw_ver_supported = 1
1441
1442 #define MEI_CFG_ICH_HFS                      \
1443         .fw_status.count = 0
1444
1445 #define MEI_CFG_ICH10_HFS                        \
1446         .fw_status.count = 1,                   \
1447         .fw_status.status[0] = PCI_CFG_HFS_1
1448
1449 #define MEI_CFG_PCH_HFS                         \
1450         .fw_status.count = 2,                   \
1451         .fw_status.status[0] = PCI_CFG_HFS_1,   \
1452         .fw_status.status[1] = PCI_CFG_HFS_2
1453
1454 #define MEI_CFG_PCH8_HFS                        \
1455         .fw_status.count = 6,                   \
1456         .fw_status.status[0] = PCI_CFG_HFS_1,   \
1457         .fw_status.status[1] = PCI_CFG_HFS_2,   \
1458         .fw_status.status[2] = PCI_CFG_HFS_3,   \
1459         .fw_status.status[3] = PCI_CFG_HFS_4,   \
1460         .fw_status.status[4] = PCI_CFG_HFS_5,   \
1461         .fw_status.status[5] = PCI_CFG_HFS_6
1462
1463 #define MEI_CFG_DMA_128 \
1464         .dma_size[DMA_DSCR_HOST] = SZ_128K, \
1465         .dma_size[DMA_DSCR_DEVICE] = SZ_128K, \
1466         .dma_size[DMA_DSCR_CTRL] = PAGE_SIZE
1467
1468 #define MEI_CFG_TRC \
1469         .hw_trc_supported = 1
1470
1471 /* ICH Legacy devices */
1472 static const struct mei_cfg mei_me_ich_cfg = {
1473         MEI_CFG_ICH_HFS,
1474 };
1475
1476 /* ICH devices */
1477 static const struct mei_cfg mei_me_ich10_cfg = {
1478         MEI_CFG_ICH10_HFS,
1479 };
1480
1481 /* PCH6 devices */
1482 static const struct mei_cfg mei_me_pch6_cfg = {
1483         MEI_CFG_PCH_HFS,
1484 };
1485
1486 /* PCH7 devices */
1487 static const struct mei_cfg mei_me_pch7_cfg = {
1488         MEI_CFG_PCH_HFS,
1489         MEI_CFG_FW_VER_SUPP,
1490 };
1491
1492 /* PCH Cougar Point and Patsburg with quirk for Node Manager exclusion */
1493 static const struct mei_cfg mei_me_pch_cpt_pbg_cfg = {
1494         MEI_CFG_PCH_HFS,
1495         MEI_CFG_FW_VER_SUPP,
1496         MEI_CFG_FW_NM,
1497 };
1498
1499 /* PCH8 Lynx Point and newer devices */
1500 static const struct mei_cfg mei_me_pch8_cfg = {
1501         MEI_CFG_PCH8_HFS,
1502         MEI_CFG_FW_VER_SUPP,
1503 };
1504
1505 /* PCH8 Lynx Point and newer devices - iTouch */
1506 static const struct mei_cfg mei_me_pch8_itouch_cfg = {
1507         MEI_CFG_KIND_ITOUCH,
1508         MEI_CFG_PCH8_HFS,
1509         MEI_CFG_FW_VER_SUPP,
1510 };
1511
1512 /* PCH8 Lynx Point with quirk for SPS Firmware exclusion */
1513 static const struct mei_cfg mei_me_pch8_sps_4_cfg = {
1514         MEI_CFG_PCH8_HFS,
1515         MEI_CFG_FW_VER_SUPP,
1516         MEI_CFG_FW_SPS_4,
1517 };
1518
1519 /* LBG with quirk for SPS (4.0) Firmware exclusion */
1520 static const struct mei_cfg mei_me_pch12_sps_4_cfg = {
1521         MEI_CFG_PCH8_HFS,
1522         MEI_CFG_FW_VER_SUPP,
1523         MEI_CFG_FW_SPS_4,
1524 };
1525
1526 /* Cannon Lake and newer devices */
1527 static const struct mei_cfg mei_me_pch12_cfg = {
1528         MEI_CFG_PCH8_HFS,
1529         MEI_CFG_FW_VER_SUPP,
1530         MEI_CFG_DMA_128,
1531 };
1532
1533 /* Cannon Lake with quirk for SPS 5.0 and newer Firmware exclusion */
1534 static const struct mei_cfg mei_me_pch12_sps_cfg = {
1535         MEI_CFG_PCH8_HFS,
1536         MEI_CFG_FW_VER_SUPP,
1537         MEI_CFG_DMA_128,
1538         MEI_CFG_FW_SPS,
1539 };
1540
1541 /* Cannon Lake itouch with quirk for SPS 5.0 and newer Firmware exclusion
1542  * w/o DMA support.
1543  */
1544 static const struct mei_cfg mei_me_pch12_itouch_sps_cfg = {
1545         MEI_CFG_KIND_ITOUCH,
1546         MEI_CFG_PCH8_HFS,
1547         MEI_CFG_FW_VER_SUPP,
1548         MEI_CFG_FW_SPS,
1549 };
1550
1551 /* Tiger Lake and newer devices */
1552 static const struct mei_cfg mei_me_pch15_cfg = {
1553         MEI_CFG_PCH8_HFS,
1554         MEI_CFG_FW_VER_SUPP,
1555         MEI_CFG_DMA_128,
1556         MEI_CFG_TRC,
1557 };
1558
1559 /* Tiger Lake with quirk for SPS 5.0 and newer Firmware exclusion */
1560 static const struct mei_cfg mei_me_pch15_sps_cfg = {
1561         MEI_CFG_PCH8_HFS,
1562         MEI_CFG_FW_VER_SUPP,
1563         MEI_CFG_DMA_128,
1564         MEI_CFG_TRC,
1565         MEI_CFG_FW_SPS,
1566 };
1567
1568 /*
1569  * mei_cfg_list - A list of platform platform specific configurations.
1570  * Note: has to be synchronized with  enum mei_cfg_idx.
1571  */
1572 static const struct mei_cfg *const mei_cfg_list[] = {
1573         [MEI_ME_UNDEF_CFG] = NULL,
1574         [MEI_ME_ICH_CFG] = &mei_me_ich_cfg,
1575         [MEI_ME_ICH10_CFG] = &mei_me_ich10_cfg,
1576         [MEI_ME_PCH6_CFG] = &mei_me_pch6_cfg,
1577         [MEI_ME_PCH7_CFG] = &mei_me_pch7_cfg,
1578         [MEI_ME_PCH_CPT_PBG_CFG] = &mei_me_pch_cpt_pbg_cfg,
1579         [MEI_ME_PCH8_CFG] = &mei_me_pch8_cfg,
1580         [MEI_ME_PCH8_ITOUCH_CFG] = &mei_me_pch8_itouch_cfg,
1581         [MEI_ME_PCH8_SPS_4_CFG] = &mei_me_pch8_sps_4_cfg,
1582         [MEI_ME_PCH12_CFG] = &mei_me_pch12_cfg,
1583         [MEI_ME_PCH12_SPS_4_CFG] = &mei_me_pch12_sps_4_cfg,
1584         [MEI_ME_PCH12_SPS_CFG] = &mei_me_pch12_sps_cfg,
1585         [MEI_ME_PCH12_SPS_ITOUCH_CFG] = &mei_me_pch12_itouch_sps_cfg,
1586         [MEI_ME_PCH15_CFG] = &mei_me_pch15_cfg,
1587         [MEI_ME_PCH15_SPS_CFG] = &mei_me_pch15_sps_cfg,
1588 };
1589
1590 const struct mei_cfg *mei_me_get_cfg(kernel_ulong_t idx)
1591 {
1592         BUILD_BUG_ON(ARRAY_SIZE(mei_cfg_list) != MEI_ME_NUM_CFG);
1593
1594         if (idx >= MEI_ME_NUM_CFG)
1595                 return NULL;
1596
1597         return mei_cfg_list[idx];
1598 };
1599
1600 /**
1601  * mei_me_dev_init - allocates and initializes the mei device structure
1602  *
1603  * @parent: device associated with physical device (pci/platform)
1604  * @cfg: per device generation config
1605  *
1606  * Return: The mei_device pointer on success, NULL on failure.
1607  */
1608 struct mei_device *mei_me_dev_init(struct device *parent,
1609                                    const struct mei_cfg *cfg)
1610 {
1611         struct mei_device *dev;
1612         struct mei_me_hw *hw;
1613         int i;
1614
1615         dev = devm_kzalloc(parent, sizeof(*dev) + sizeof(*hw), GFP_KERNEL);
1616         if (!dev)
1617                 return NULL;
1618
1619         hw = to_me_hw(dev);
1620
1621         for (i = 0; i < DMA_DSCR_NUM; i++)
1622                 dev->dr_dscr[i].size = cfg->dma_size[i];
1623
1624         mei_device_init(dev, parent, &mei_me_hw_ops);
1625         hw->cfg = cfg;
1626
1627         dev->fw_f_fw_ver_supported = cfg->fw_ver_supported;
1628
1629         dev->kind = cfg->kind;
1630
1631         return dev;
1632 }
1633