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
  37 #define I915_CSR_KBL "i915/kbl_dmc_ver1_01.bin"
  38 MODULE_FIRMWARE(I915_CSR_KBL);
  39 #define KBL_CSR_VERSION_REQUIRED        CSR_VERSION(1, 1)
  40
  41 #define I915_CSR_SKL "i915/skl_dmc_ver1_26.bin"
  42 MODULE_FIRMWARE(I915_CSR_SKL);
  43 #define SKL_CSR_VERSION_REQUIRED        CSR_VERSION(1, 26)
  44
  45 #define I915_CSR_BXT "i915/bxt_dmc_ver1_07.bin"
  46 MODULE_FIRMWARE(I915_CSR_BXT);
  47 #define BXT_CSR_VERSION_REQUIRED        CSR_VERSION(1, 7)
  48
  49 #define FIRMWARE_URL  "https://01.org/linuxgraphics/intel-linux-graphics-firmwares"
  50
  51
  52
  53
  54 #define CSR_MAX_FW_SIZE                 0x2FFF
  55 #define CSR_DEFAULT_FW_OFFSET           0xFFFFFFFF
  56
  57 struct intel_css_header {
  58         /* 0x09 for DMC */
  59         uint32_t module_type;
  60
  61         /* Includes the DMC specific header in dwords */
  62         uint32_t header_len;
  63
  64         /* always value would be 0x10000 */
  65         uint32_t header_ver;
  66
  67         /* Not used */
  68         uint32_t module_id;
  69
  70         /* Not used */
  71         uint32_t module_vendor;
  72
  73         /* in YYYYMMDD format */
  74         uint32_t date;
  75
  76         /* Size in dwords (CSS_Headerlen + PackageHeaderLen + dmc FWsLen)/4 */
  77         uint32_t size;
  78
  79         /* Not used */
  80         uint32_t key_size;
  81
  82         /* Not used */
  83         uint32_t modulus_size;
  84
  85         /* Not used */
  86         uint32_t exponent_size;
  87
  88         /* Not used */
  89         uint32_t reserved1[12];
  90
  91         /* Major Minor */
  92         uint32_t version;
  93
  94         /* Not used */
  95         uint32_t reserved2[8];
  96
  97         /* Not used */
  98         uint32_t kernel_header_info;
  99 } __packed;
 100
 101 struct intel_fw_info {
 102         uint16_t reserved1;
 103
 104         /* Stepping (A, B, C, ..., *). * is a wildcard */
 105         char stepping;
 106
 107         /* Sub-stepping (0, 1, ..., *). * is a wildcard */
 108         char substepping;
 109
 110         uint32_t offset;
 111         uint32_t reserved2;
 112 } __packed;
 113
 114 struct intel_package_header {
 115         /* DMC container header length in dwords */
 116         unsigned char header_len;
 117
 118         /* always value would be 0x01 */
 119         unsigned char header_ver;
 120
 121         unsigned char reserved[10];
 122
 123         /* Number of valid entries in the FWInfo array below */
 124         uint32_t num_entries;
 125
 126         struct intel_fw_info fw_info[20];
 127 } __packed;
 128
 129 struct intel_dmc_header {
 130         /* always value would be 0x40403E3E */
 131         uint32_t signature;
 132
 133         /* DMC binary header length */
 134         unsigned char header_len;
 135
 136         /* 0x01 */
 137         unsigned char header_ver;
 138
 139         /* Reserved */
 140         uint16_t dmcc_ver;
 141
 142         /* Major, Minor */
 143         uint32_t        project;
 144
 145         /* Firmware program size (excluding header) in dwords */
 146         uint32_t        fw_size;
 147
 148         /* Major Minor version */
 149         uint32_t fw_version;
 150
 151         /* Number of valid MMIO cycles present. */
 152         uint32_t mmio_count;
 153
 154         /* MMIO address */
 155         uint32_t mmioaddr[8];
 156
 157         /* MMIO data */
 158         uint32_t mmiodata[8];
 159
 160         /* FW filename  */
 161         unsigned char dfile[32];
 162
 163         uint32_t reserved1[2];
 164 } __packed;
 165
 166 struct stepping_info {
 167         char stepping;
 168         char substepping;
 169 };
 170
 171 static const struct stepping_info skl_stepping_info[] = {
 172         {'A', '0'}, {'B', '0'}, {'C', '0'},
 173         {'D', '0'}, {'E', '0'}, {'F', '0'},
 174         {'G', '0'}, {'H', '0'}, {'I', '0'},
 175         {'J', '0'}, {'K', '0'}
 176 };
 177
 178 static const struct stepping_info bxt_stepping_info[] = {
 179         {'A', '0'}, {'A', '1'}, {'A', '2'},
 180         {'B', '0'}, {'B', '1'}, {'B', '2'}
 181 };
 182
 183 static const struct stepping_info no_stepping_info = { '*', '*' };
 184
 185 static const struct stepping_info *
 186 intel_get_stepping_info(struct drm_i915_private *dev_priv)
 187 {
 188         const struct stepping_info *si;
 189         unsigned int size;
 190
 191         if (IS_SKYLAKE(dev_priv)) {
 192                 size = ARRAY_SIZE(skl_stepping_info);
 193                 si = skl_stepping_info;
 194         } else if (IS_BROXTON(dev_priv)) {
 195                 size = ARRAY_SIZE(bxt_stepping_info);
 196                 si = bxt_stepping_info;
 197         } else {
 198                 size = 0;
 199         }
 200
 201         if (INTEL_REVID(dev_priv) < size)
 202                 return si + INTEL_REVID(dev_priv);
 203
 204         return &no_stepping_info;
 205 }
 206
 207 static void gen9_set_dc_state_debugmask(struct drm_i915_private *dev_priv)
 208 {
 209         uint32_t val, mask;
 210
 211         mask = DC_STATE_DEBUG_MASK_MEMORY_UP;
 212
 213         if (IS_BROXTON(dev_priv))
 214                 mask |= DC_STATE_DEBUG_MASK_CORES;
 215
 216         /* The below bit doesn't need to be cleared ever afterwards */
 217         val = I915_READ(DC_STATE_DEBUG);
 218         if ((val & mask) != mask) {
 219                 val |= mask;
 220                 I915_WRITE(DC_STATE_DEBUG, val);
 221                 POSTING_READ(DC_STATE_DEBUG);
 222         }
 223 }
 224
 225 /**
 226  * intel_csr_load_program() - write the firmware from memory to register.
 227  * @dev_priv: i915 drm device.
 228  *
 229  * CSR firmware is read from a .bin file and kept in internal memory one time.
 230  * Everytime display comes back from low power state this function is called to
 231  * copy the firmware from internal memory to registers.
 232  */
 233 void intel_csr_load_program(struct drm_i915_private *dev_priv)
 234 {
 235         u32 *payload = dev_priv->csr.dmc_payload;
 236         uint32_t i, fw_size;
 237
 238         if (!IS_GEN9(dev_priv)) {
 239                 DRM_ERROR("No CSR support available for this platform\n");
 240                 return;
 241         }
 242
 243         if (!dev_priv->csr.dmc_payload) {
 244                 DRM_ERROR("Tried to program CSR with empty payload\n");
 245                 return;
 246         }
 247
 248         fw_size = dev_priv->csr.dmc_fw_size;
 249         for (i = 0; i < fw_size; i++)
 250                 I915_WRITE(CSR_PROGRAM(i), payload[i]);
 251
 252         for (i = 0; i < dev_priv->csr.mmio_count; i++) {
 253                 I915_WRITE(dev_priv->csr.mmioaddr[i],
 254                            dev_priv->csr.mmiodata[i]);
 255         }
 256
 257         dev_priv->csr.dc_state = 0;
 258
 259         gen9_set_dc_state_debugmask(dev_priv);
 260 }
 261
 262 static uint32_t *parse_csr_fw(struct drm_i915_private *dev_priv,
 263                               const struct firmware *fw)
 264 {
 265         struct intel_css_header *css_header;
 266         struct intel_package_header *package_header;
 267         struct intel_dmc_header *dmc_header;
 268         struct intel_csr *csr = &dev_priv->csr;
 269         const struct stepping_info *si = intel_get_stepping_info(dev_priv);
 270         uint32_t dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes;
 271         uint32_t i;
 272         uint32_t *dmc_payload;
 273         uint32_t required_version;
 274
 275         if (!fw)
 276                 return NULL;
 277
 278         /* Extract CSS Header information*/
 279         css_header = (struct intel_css_header *)fw->data;
 280         if (sizeof(struct intel_css_header) !=
 281             (css_header->header_len * 4)) {
 282                 DRM_ERROR("Firmware has wrong CSS header length %u bytes\n",
 283                           (css_header->header_len * 4));
 284                 return NULL;
 285         }
 286
 287         csr->version = css_header->version;
 288
 289         if (IS_KABYLAKE(dev_priv)) {
 290                 required_version = KBL_CSR_VERSION_REQUIRED;
 291         } else if (IS_SKYLAKE(dev_priv)) {
 292                 required_version = SKL_CSR_VERSION_REQUIRED;
 293         } else if (IS_BROXTON(dev_priv)) {
 294                 required_version = BXT_CSR_VERSION_REQUIRED;
 295         } else {
 296                 MISSING_CASE(INTEL_REVID(dev_priv));
 297                 required_version = 0;
 298         }
 299
 300         if (csr->version != required_version) {
 301                 DRM_INFO("Refusing to load DMC firmware v%u.%u,"
 302                          " please use v%u.%u [" FIRMWARE_URL "].\n",
 303                          CSR_VERSION_MAJOR(csr->version),
 304                          CSR_VERSION_MINOR(csr->version),
 305                          CSR_VERSION_MAJOR(required_version),
 306                          CSR_VERSION_MINOR(required_version));
 307                 return NULL;
 308         }
 309
 310         readcount += sizeof(struct intel_css_header);
 311
 312         /* Extract Package Header information*/
 313         package_header = (struct intel_package_header *)
 314                 &fw->data[readcount];
 315         if (sizeof(struct intel_package_header) !=
 316             (package_header->header_len * 4)) {
 317                 DRM_ERROR("Firmware has wrong package header length %u bytes\n",
 318                           (package_header->header_len * 4));
 319                 return NULL;
 320         }
 321         readcount += sizeof(struct intel_package_header);
 322
 323         /* Search for dmc_offset to find firware binary. */
 324         for (i = 0; i < package_header->num_entries; i++) {
 325                 if (package_header->fw_info[i].substepping == '*' &&
 326                     si->stepping == package_header->fw_info[i].stepping) {
 327                         dmc_offset = package_header->fw_info[i].offset;
 328                         break;
 329                 } else if (si->stepping == package_header->fw_info[i].stepping &&
 330                            si->substepping == package_header->fw_info[i].substepping) {
 331                         dmc_offset = package_header->fw_info[i].offset;
 332                         break;
 333                 } else if (package_header->fw_info[i].stepping == '*' &&
 334                            package_header->fw_info[i].substepping == '*')
 335                         dmc_offset = package_header->fw_info[i].offset;
 336         }
 337         if (dmc_offset == CSR_DEFAULT_FW_OFFSET) {
 338                 DRM_ERROR("Firmware not supported for %c stepping\n",
 339                           si->stepping);
 340                 return NULL;
 341         }
 342         readcount += dmc_offset;
 343
 344         /* Extract dmc_header information. */
 345         dmc_header = (struct intel_dmc_header *)&fw->data[readcount];
 346         if (sizeof(struct intel_dmc_header) != (dmc_header->header_len)) {
 347                 DRM_ERROR("Firmware has wrong dmc header length %u bytes\n",
 348                           (dmc_header->header_len));
 349                 return NULL;
 350         }
 351         readcount += sizeof(struct intel_dmc_header);
 352
 353         /* Cache the dmc header info. */
 354         if (dmc_header->mmio_count > ARRAY_SIZE(csr->mmioaddr)) {
 355                 DRM_ERROR("Firmware has wrong mmio count %u\n",
 356                           dmc_header->mmio_count);
 357                 return NULL;
 358         }
 359         csr->mmio_count = dmc_header->mmio_count;
 360         for (i = 0; i < dmc_header->mmio_count; i++) {
 361                 if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE ||
 362                     dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) {
 363                         DRM_ERROR(" Firmware has wrong mmio address 0x%x\n",
 364                                   dmc_header->mmioaddr[i]);
 365                         return NULL;
 366                 }
 367                 csr->mmioaddr[i] = _MMIO(dmc_header->mmioaddr[i]);
 368                 csr->mmiodata[i] = dmc_header->mmiodata[i];
 369         }
 370
 371         /* fw_size is in dwords, so multiplied by 4 to convert into bytes. */
 372         nbytes = dmc_header->fw_size * 4;
 373         if (nbytes > CSR_MAX_FW_SIZE) {
 374                 DRM_ERROR("CSR firmware too big (%u) bytes\n", nbytes);
 375                 return NULL;
 376         }
 377         csr->dmc_fw_size = dmc_header->fw_size;
 378
 379         dmc_payload = kmalloc(nbytes, GFP_KERNEL);
 380         if (!dmc_payload) {
 381                 DRM_ERROR("Memory allocation failed for dmc payload\n");
 382                 return NULL;
 383         }
 384
 385         return memcpy(dmc_payload, &fw->data[readcount], nbytes);
 386 }
 387
 388 static void csr_load_work_fn(struct work_struct *work)
 389 {
 390         struct drm_i915_private *dev_priv;
 391         struct intel_csr *csr;
 392         const struct firmware *fw;
 393         int ret;
 394
 395         dev_priv = container_of(work, typeof(*dev_priv), csr.work);
 396         csr = &dev_priv->csr;
 397
 398         ret = request_firmware(&fw, dev_priv->csr.fw_path,
 399                                &dev_priv->drm.pdev->dev);
 400         if (fw)
 401                 dev_priv->csr.dmc_payload = parse_csr_fw(dev_priv, fw);
 402
 403         if (dev_priv->csr.dmc_payload) {
 404                 intel_csr_load_program(dev_priv);
 405
 406                 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 407
 408                 DRM_INFO("Finished loading %s (v%u.%u)\n",
 409                          dev_priv->csr.fw_path,
 410                          CSR_VERSION_MAJOR(csr->version),
 411                          CSR_VERSION_MINOR(csr->version));
 412         } else {
 413                 dev_notice(dev_priv->drm.dev,
 414                            "Failed to load DMC firmware"
 415                            " [" FIRMWARE_URL "],"
 416                            " disabling runtime power management.\n");
 417         }
 418
 419         release_firmware(fw);
 420 }
 421
 422 /**
 423  * intel_csr_ucode_init() - initialize the firmware loading.
 424  * @dev_priv: i915 drm device.
 425  *
 426  * This function is called at the time of loading the display driver to read
 427  * firmware from a .bin file and copied into a internal memory.
 428  */
 429 void intel_csr_ucode_init(struct drm_i915_private *dev_priv)
 430 {
 431         struct intel_csr *csr = &dev_priv->csr;
 432
 433         INIT_WORK(&dev_priv->csr.work, csr_load_work_fn);
 434
 435         if (!HAS_CSR(dev_priv))
 436                 return;
 437
 438         if (IS_KABYLAKE(dev_priv))
 439                 csr->fw_path = I915_CSR_KBL;
 440         else if (IS_SKYLAKE(dev_priv))
 441                 csr->fw_path = I915_CSR_SKL;
 442         else if (IS_BROXTON(dev_priv))
 443                 csr->fw_path = I915_CSR_BXT;
 444         else {
 445                 DRM_ERROR("Unexpected: no known CSR firmware for platform\n");
 446                 return;
 447         }
 448
 449         DRM_DEBUG_KMS("Loading %s\n", csr->fw_path);
 450
 451         /*
 452          * Obtain a runtime pm reference, until CSR is loaded,
 453          * to avoid entering runtime-suspend.
 454          */
 455         intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
 456
 457         schedule_work(&dev_priv->csr.work);
 458 }
 459
 460 /**
 461  * intel_csr_ucode_suspend() - prepare CSR firmware before system suspend
 462  * @dev_priv: i915 drm device
 463  *
 464  * Prepare the DMC firmware before entering system suspend. This includes
 465  * flushing pending work items and releasing any resources acquired during
 466  * init.
 467  */
 468 void intel_csr_ucode_suspend(struct drm_i915_private *dev_priv)
 469 {
 470         if (!HAS_CSR(dev_priv))
 471                 return;
 472
 473         flush_work(&dev_priv->csr.work);
 474
 475         /* Drop the reference held in case DMC isn't loaded. */
 476         if (!dev_priv->csr.dmc_payload)
 477                 intel_display_power_put(dev_priv, POWER_DOMAIN_INIT);
 478 }
 479
 480 /**
 481  * intel_csr_ucode_resume() - init CSR firmware during system resume
 482  * @dev_priv: i915 drm device
 483  *
 484  * Reinitialize the DMC firmware during system resume, reacquiring any
 485  * resources released in intel_csr_ucode_suspend().
 486  */
 487 void intel_csr_ucode_resume(struct drm_i915_private *dev_priv)
 488 {
 489         if (!HAS_CSR(dev_priv))
 490                 return;
 491
 492         /*
 493          * Reacquire the reference to keep RPM disabled in case DMC isn't
 494          * loaded.
 495          */
 496         if (!dev_priv->csr.dmc_payload)
 497                 intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
 498 }
 499
 500 /**
 501  * intel_csr_ucode_fini() - unload the CSR firmware.
 502  * @dev_priv: i915 drm device.
 503  *
 504  * Firmmware unloading includes freeing the internal memory and reset the
 505  * firmware loading status.
 506  */
 507 void intel_csr_ucode_fini(struct drm_i915_private *dev_priv)
 508 {
 509         if (!HAS_CSR(dev_priv))
 510                 return;
 511
 512         intel_csr_ucode_suspend(dev_priv);
 513
 514         kfree(dev_priv->csr.dmc_payload);
 515 }