drivers/gpu/drm/i915/intel_csr.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24 #include <linux/firmware.h>
  25 #include "i915_drv.h"
  26 #include "i915_reg.h"
  27
  28 /**
  29  * DOC: csr support for dmc
  30  *
  31  * Display Context Save and Restore (CSR) firmware support added from gen9
  32  * onwards to drive newly added DMC (Display microcontroller) in display
  33  * engine to save and restore the state of display engine when it enter into
  34  * low-power state and comes back to normal.
  35  *
  36  * Firmware loading status will be one of the below states: FW_UNINITIALIZED,
  37  * FW_LOADED, FW_FAILED.
  38  *
  39  * Once the firmware is written into the registers status will be moved from
  40  * FW_UNINITIALIZED to FW_LOADED and for any erroneous condition status will
  41  * be moved to FW_FAILED.
  42  */
  43
  44 #define I915_CSR_KBL "i915/kbl_dmc_ver1.bin"
  45 MODULE_FIRMWARE(I915_CSR_KBL);
  46 #define KBL_CSR_VERSION_REQUIRED        CSR_VERSION(1, 1)
  47
  48 #define I915_CSR_SKL "i915/skl_dmc_ver1.bin"
  49 MODULE_FIRMWARE(I915_CSR_SKL);
  50 #define SKL_CSR_VERSION_REQUIRED        CSR_VERSION(1, 23)
  51
  52 #define I915_CSR_BXT "i915/bxt_dmc_ver1.bin"
  53 MODULE_FIRMWARE(I915_CSR_BXT);
  54 #define BXT_CSR_VERSION_REQUIRED        CSR_VERSION(1, 7)
  55
  56 #define FIRMWARE_URL  "https://01.org/linuxgraphics/intel-linux-graphics-firmwares"
  57
  58
  59
  60
  61 #define CSR_MAX_FW_SIZE                 0x2FFF
  62 #define CSR_DEFAULT_FW_OFFSET           0xFFFFFFFF
  63
  64 struct intel_css_header {
  65         /* 0x09 for DMC */
  66         uint32_t module_type;
  67
  68         /* Includes the DMC specific header in dwords */
  69         uint32_t header_len;
  70
  71         /* always value would be 0x10000 */
  72         uint32_t header_ver;
  73
  74         /* Not used */
  75         uint32_t module_id;
  76
  77         /* Not used */
  78         uint32_t module_vendor;
  79
  80         /* in YYYYMMDD format */
  81         uint32_t date;
  82
  83         /* Size in dwords (CSS_Headerlen + PackageHeaderLen + dmc FWsLen)/4 */
  84         uint32_t size;
  85
  86         /* Not used */
  87         uint32_t key_size;
  88
  89         /* Not used */
  90         uint32_t modulus_size;
  91
  92         /* Not used */
  93         uint32_t exponent_size;
  94
  95         /* Not used */
  96         uint32_t reserved1[12];
  97
  98         /* Major Minor */
  99         uint32_t version;
 100
 101         /* Not used */
 102         uint32_t reserved2[8];
 103
 104         /* Not used */
 105         uint32_t kernel_header_info;
 106 } __packed;
 107
 108 struct intel_fw_info {
 109         uint16_t reserved1;
 110
 111         /* Stepping (A, B, C, ..., *). * is a wildcard */
 112         char stepping;
 113
 114         /* Sub-stepping (0, 1, ..., *). * is a wildcard */
 115         char substepping;
 116
 117         uint32_t offset;
 118         uint32_t reserved2;
 119 } __packed;
 120
 121 struct intel_package_header {
 122         /* DMC container header length in dwords */
 123         unsigned char header_len;
 124
 125         /* always value would be 0x01 */
 126         unsigned char header_ver;
 127
 128         unsigned char reserved[10];
 129
 130         /* Number of valid entries in the FWInfo array below */
 131         uint32_t num_entries;
 132
 133         struct intel_fw_info fw_info[20];
 134 } __packed;
 135
 136 struct intel_dmc_header {
 137         /* always value would be 0x40403E3E */
 138         uint32_t signature;
 139
 140         /* DMC binary header length */
 141         unsigned char header_len;
 142
 143         /* 0x01 */
 144         unsigned char header_ver;
 145
 146         /* Reserved */
 147         uint16_t dmcc_ver;
 148
 149         /* Major, Minor */
 150         uint32_t        project;
 151
 152         /* Firmware program size (excluding header) in dwords */
 153         uint32_t        fw_size;
 154
 155         /* Major Minor version */
 156         uint32_t fw_version;
 157
 158         /* Number of valid MMIO cycles present. */
 159         uint32_t mmio_count;
 160
 161         /* MMIO address */
 162         uint32_t mmioaddr[8];
 163
 164         /* MMIO data */
 165         uint32_t mmiodata[8];
 166
 167         /* FW filename  */
 168         unsigned char dfile[32];
 169
 170         uint32_t reserved1[2];
 171 } __packed;
 172
 173 struct stepping_info {
 174         char stepping;
 175         char substepping;
 176 };
 177
 178 static const struct stepping_info kbl_stepping_info[] = {
 179         {'A', '0'}, {'B', '0'}, {'C', '0'},
 180         {'D', '0'}, {'E', '0'}, {'F', '0'},
 181         {'G', '0'}, {'H', '0'}, {'I', '0'},
 182 };
 183
 184 static const struct stepping_info skl_stepping_info[] = {
 185         {'A', '0'}, {'B', '0'}, {'C', '0'},
 186         {'D', '0'}, {'E', '0'}, {'F', '0'},
 187         {'G', '0'}, {'H', '0'}, {'I', '0'},
 188         {'J', '0'}, {'K', '0'}
 189 };
 190
 191 static const struct stepping_info bxt_stepping_info[] = {
 192         {'A', '0'}, {'A', '1'}, {'A', '2'},
 193         {'B', '0'}, {'B', '1'}, {'B', '2'}
 194 };
 195
 196 static const struct stepping_info no_stepping_info = { '*', '*' };
 197
 198 static const struct stepping_info *
 199 intel_get_stepping_info(struct drm_i915_private *dev_priv)
 200 {
 201         const struct stepping_info *si;
 202         unsigned int size;
 203
 204         if (IS_KABYLAKE(dev_priv)) {
 205                 size = ARRAY_SIZE(kbl_stepping_info);
 206                 si = kbl_stepping_info;
 207         } else if (IS_SKYLAKE(dev_priv)) {
 208                 size = ARRAY_SIZE(skl_stepping_info);
 209                 si = skl_stepping_info;
 210         } else if (IS_BROXTON(dev_priv)) {
 211                 size = ARRAY_SIZE(bxt_stepping_info);
 212                 si = bxt_stepping_info;
 213         } else {
 214                 size = 0;
 215         }
 216
 217         if (INTEL_REVID(dev_priv) < size)
 218                 return si + INTEL_REVID(dev_priv);
 219
 220         return &no_stepping_info;
 221 }
 222
 223 static void gen9_set_dc_state_debugmask(struct drm_i915_private *dev_priv)
 224 {
 225         uint32_t val, mask;
 226
 227         mask = DC_STATE_DEBUG_MASK_MEMORY_UP;
 228
 229         if (IS_BROXTON(dev_priv))
 230                 mask |= DC_STATE_DEBUG_MASK_CORES;
 231
 232         /* The below bit doesn't need to be cleared ever afterwards */
 233         val = I915_READ(DC_STATE_DEBUG);
 234         if ((val & mask) != mask) {
 235                 val |= mask;
 236                 I915_WRITE(DC_STATE_DEBUG, val);
 237                 POSTING_READ(DC_STATE_DEBUG);
 238         }
 239 }
 240
 241 /**
 242  * intel_csr_load_program() - write the firmware from memory to register.
 243  * @dev_priv: i915 drm device.
 244  *
 245  * CSR firmware is read from a .bin file and kept in internal memory one time.
 246  * Everytime display comes back from low power state this function is called to
 247  * copy the firmware from internal memory to registers.
 248  */
 249 void intel_csr_load_program(struct drm_i915_private *dev_priv)
 250 {
 251         u32 *payload = dev_priv->csr.dmc_payload;
 252         uint32_t i, fw_size;
 253
 254         if (!IS_GEN9(dev_priv)) {
 255                 DRM_ERROR("No CSR support available for this platform\n");
 256                 return;
 257         }
 258
 259         if (!dev_priv->csr.dmc_payload) {
 260                 DRM_ERROR("Tried to program CSR with empty payload\n");
 261                 return;
 262         }
 263
 264         fw_size = dev_priv->csr.dmc_fw_size;
 265         for (i = 0; i < fw_size; i++)
 266                 I915_WRITE(CSR_PROGRAM(i), payload[i]);
 267
 268         for (i = 0; i < dev_priv->csr.mmio_count; i++) {
 269                 I915_WRITE(dev_priv->csr.mmioaddr[i],
 270                            dev_priv->csr.mmiodata[i]);
 271         }
 272
 273         dev_priv->csr.dc_state = 0;
 274
 275         gen9_set_dc_state_debugmask(dev_priv);
 276 }
 277
 278 static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
 279                               const struct firmware *fw)
 280 {
 281         struct intel_css_header *css_header;
 282         struct intel_package_header *package_header;
 283         struct intel_dmc_header *dmc_header;
 284         struct intel_csr *csr = &dev_priv->csr;
 285         const struct stepping_info *si = intel_get_stepping_info(dev_priv);
 286         uint32_t dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes;
 287         uint32_t i;
 288         uint32_t *dmc_payload;
 289         uint32_t required_min_version;
 290
 291         if (!fw)
 292                 return NULL;
 293
 294         /* Extract CSS Header information*/
 295         css_header = (struct intel_css_header *)fw->data;
 296         if (sizeof(struct intel_css_header) !=
 297             (css_header->header_len * 4)) {
 298                 DRM_ERROR("Firmware has wrong CSS header length %u bytes\n",
 299                           (css_header->header_len * 4));
 300                 return NULL;
 301         }
 302
 303         csr->version = css_header->version;
 304
 305         if (IS_KABYLAKE(dev_priv)) {
 306                 required_min_version = KBL_CSR_VERSION_REQUIRED;
 307         } else if (IS_SKYLAKE(dev_priv)) {
 308                 required_min_version = SKL_CSR_VERSION_REQUIRED;
 309         } else if (IS_BROXTON(dev_priv)) {
 310                 required_min_version = BXT_CSR_VERSION_REQUIRED;
 311         } else {
 312                 MISSING_CASE(INTEL_REVID(dev_priv));
 313                 required_min_version = 0;
 314         }
 315
 316         if (csr->version < required_min_version) {
 317                 DRM_INFO("Refusing to load old DMC firmware v%u.%u,"
 318                          " please upgrade to v%u.%u or later"
 319                            " [" FIRMWARE_URL "].\n",
 320                          CSR_VERSION_MAJOR(csr->version),
 321                          CSR_VERSION_MINOR(csr->version),
 322                          CSR_VERSION_MAJOR(required_min_version),
 323                          CSR_VERSION_MINOR(required_min_version));
 324                 return NULL;
 325         }
 326
 327         readcount += sizeof(struct intel_css_header);
 328
 329         /* Extract Package Header information*/
 330         package_header = (struct intel_package_header *)
 331                 &fw->data[readcount];
 332         if (sizeof(struct intel_package_header) !=
 333             (package_header->header_len * 4)) {
 334                 DRM_ERROR("Firmware has wrong package header length %u bytes\n",
 335                           (package_header->header_len * 4));
 336                 return NULL;
 337         }
 338         readcount += sizeof(struct intel_package_header);
 339
 340         /* Search for dmc_offset to find firware binary. */
 341         for (i = 0; i < package_header->num_entries; i++) {
 342                 if (package_header->fw_info[i].substepping == '*' &&
 343                     si->stepping == package_header->fw_info[i].stepping) {
 344                         dmc_offset = package_header->fw_info[i].offset;
 345                         break;
 346                 } else if (si->stepping == package_header->fw_info[i].stepping &&
 347                            si->substepping == package_header->fw_info[i].substepping) {
 348                         dmc_offset = package_header->fw_info[i].offset;
 349                         break;
 350                 } else if (package_header->fw_info[i].stepping == '*' &&
 351                            package_header->fw_info[i].substepping == '*')
 352                         dmc_offset = package_header->fw_info[i].offset;
 353         }
 354         if (dmc_offset == CSR_DEFAULT_FW_OFFSET) {
 355                 DRM_ERROR("Firmware not supported for %c stepping\n",
 356                           si->stepping);
 357                 return NULL;
 358         }
 359         readcount += dmc_offset;
 360
 361         /* Extract dmc_header information. */
 362         dmc_header = (struct intel_dmc_header *)&fw->data[readcount];
 363         if (sizeof(struct intel_dmc_header) != (dmc_header->header_len)) {
 364                 DRM_ERROR("Firmware has wrong dmc header length %u bytes\n",
 365                           (dmc_header->header_len));
 366                 return NULL;
 367         }
 368         readcount += sizeof(struct intel_dmc_header);
 369
 370         /* Cache the dmc header info. */
 371         if (dmc_header->mmio_count > ARRAY_SIZE(csr->mmioaddr)) {
 372                 DRM_ERROR("Firmware has wrong mmio count %u\n",
 373                           dmc_header->mmio_count);
 374                 return NULL;
 375         }
 376         csr->mmio_count = dmc_header->mmio_count;
 377         for (i = 0; i < dmc_header->mmio_count; i++) {
 378                 if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE ||
 379                     dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) {
 380                         DRM_ERROR(" Firmware has wrong mmio address 0x%x\n",
 381                                   dmc_header->mmioaddr[i]);
 382                         return NULL;
 383                 }
 384                 csr->mmioaddr[i] = _MMIO(dmc_header->mmioaddr[i]);
 385                 csr->mmiodata[i] = dmc_header->mmiodata[i];
 386         }
 387
 388         /* fw_size is in dwords, so multiplied by 4 to convert into bytes. */
 389         nbytes = dmc_header->fw_size * 4;
 390         if (nbytes > CSR_MAX_FW_SIZE) {
 391                 DRM_ERROR("CSR firmware too big (%u) bytes\n", nbytes);
 392                 return NULL;
 393         }
 394         csr->dmc_fw_size = dmc_header->fw_size;
 395
 396         dmc_payload = kmalloc(nbytes, GFP_KERNEL);
 397         if (!dmc_payload) {
 398                 DRM_ERROR("Memory allocation failed for dmc payload\n");
 399                 return NULL;
 400         }
 401
 402         return memcpy(dmc_payload, &fw->data[readcount], nbytes);
 403 }
 404
 405 static void csr_load_work_fn(struct work_struct *work)
 406 {
 407         struct drm_i915_private *dev_priv;
 408         struct intel_csr *csr;
 409         const struct firmware *fw;
 410         int ret;
 411
 412         dev_priv = container_of(work, typeof(*dev_priv), csr.work);
 413         csr = &dev_priv->csr;
 414
 415         ret = request_firmware(&fw, dev_priv->csr.fw_path,
 416                                &dev_priv->dev->pdev->dev);
 417         if (fw)
 418                 dev_priv->csr.dmc_payload = parse_csr_fw(dev_priv, fw);
 419
 420         if (dev_priv->csr.dmc_payload) {
 421                 intel_csr_load_program(dev_priv);
 422
 423                 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 424
 425                 DRM_INFO("Finished loading %s (v%u.%u)\n",
 426                          dev_priv->csr.fw_path,
 427                          CSR_VERSION_MAJOR(csr->version),
 428                          CSR_VERSION_MINOR(csr->version));
 429         } else {
 430                 dev_notice(dev_priv->dev->dev,
 431                            "Failed to load DMC firmware"
 432                            " [" FIRMWARE_URL "],"
 433                            " disabling runtime power management.\n");
 434         }
 435
 436         release_firmware(fw);
 437 }
 438
 439 /**
 440  * intel_csr_ucode_init() - initialize the firmware loading.
 441  * @dev_priv: i915 drm device.
 442  *
 443  * This function is called at the time of loading the display driver to read
 444  * firmware from a .bin file and copied into a internal memory.
 445  */
 446 void intel_csr_ucode_init(struct drm_i915_private *dev_priv)
 447 {
 448         struct intel_csr *csr = &dev_priv->csr;
 449
 450         INIT_WORK(&dev_priv->csr.work, csr_load_work_fn);
 451
 452         if (!HAS_CSR(dev_priv))
 453                 return;
 454
 455         if (IS_KABYLAKE(dev_priv))
 456                 csr->fw_path = I915_CSR_KBL;
 457         else if (IS_SKYLAKE(dev_priv))
 458                 csr->fw_path = I915_CSR_SKL;
 459         else if (IS_BROXTON(dev_priv))
 460                 csr->fw_path = I915_CSR_BXT;
 461         else {
 462                 DRM_ERROR("Unexpected: no known CSR firmware for platform\n");
 463                 return;
 464         }
 465
 466         DRM_DEBUG_KMS("Loading %s\n", csr->fw_path);
 467
 468         /*
 469          * Obtain a runtime pm reference, until CSR is loaded,
 470          * to avoid entering runtime-suspend.
 471          */
 472         intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
 473
 474         schedule_work(&dev_priv->csr.work);
 475 }
 476
 477 /**
 478  * intel_csr_ucode_suspend() - prepare CSR firmware before system suspend
 479  * @dev_priv: i915 drm device
 480  *
 481  * Prepare the DMC firmware before entering system suspend. This includes
 482  * flushing pending work items and releasing any resources acquired during
 483  * init.
 484  */
 485 void intel_csr_ucode_suspend(struct drm_i915_private *dev_priv)
 486 {
 487         if (!HAS_CSR(dev_priv))
 488                 return;
 489
 490         flush_work(&dev_priv->csr.work);
 491
 492         /* Drop the reference held in case DMC isn't loaded. */
 493         if (!dev_priv->csr.dmc_payload)
 494                 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 495 }
 496
 497 /**
 498  * intel_csr_ucode_resume() - init CSR firmware during system resume
 499  * @dev_priv: i915 drm device
 500  *
 501  * Reinitialize the DMC firmware during system resume, reacquiring any
 502  * resources released in intel_csr_ucode_suspend().
 503  */
 504 void intel_csr_ucode_resume(struct drm_i915_private *dev_priv)
 505 {
 506         if (!HAS_CSR(dev_priv))
 507                 return;
 508
 509         /*
 510          * Reacquire the reference to keep RPM disabled in case DMC isn't
 511          * loaded.
 512          */
 513         if (!dev_priv->csr.dmc_payload)
 514                 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
 515 }
 516
 517 /**
 518  * intel_csr_ucode_fini() - unload the CSR firmware.
 519  * @dev_priv: i915 drm device.
 520  *
 521  * Firmmware unloading includes freeing the internal memory and reset the
 522  * firmware loading status.
 523  */
 524 void intel_csr_ucode_fini(struct drm_i915_private *dev_priv)
 525 {
 526         if (!HAS_CSR(dev_priv))
 527                 return;
 528
 529         intel_csr_ucode_suspend(dev_priv);
 530
 531         kfree(dev_priv->csr.dmc_payload);
 532 }