kernel/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_SKL "i915/skl_dmc_ver1.bin"
  45 #define I915_CSR_BXT "i915/bxt_dmc_ver1.bin"
  46
  47 MODULE_FIRMWARE(I915_CSR_SKL);
  48 MODULE_FIRMWARE(I915_CSR_BXT);
  49
  50 /*
  51 * SKL CSR registers for DC5 and DC6
  52 */
  53 #define CSR_PROGRAM(i)                  (0x80000 + (i) * 4)
  54 #define CSR_SSP_BASE_ADDR_GEN9          0x00002FC0
  55 #define CSR_HTP_ADDR_SKL                0x00500034
  56 #define CSR_SSP_BASE                    0x8F074
  57 #define CSR_HTP_SKL                     0x8F004
  58 #define CSR_LAST_WRITE                  0x8F034
  59 #define CSR_LAST_WRITE_VALUE            0xc003b400
  60 /* MMIO address range for CSR program (0x80000 - 0x82FFF) */
  61 #define CSR_MAX_FW_SIZE                 0x2FFF
  62 #define CSR_DEFAULT_FW_OFFSET           0xFFFFFFFF
  63 #define CSR_MMIO_START_RANGE    0x80000
  64 #define CSR_MMIO_END_RANGE              0x8FFFF
  65
  66 struct intel_css_header {
  67         /* 0x09 for DMC */
  68         uint32_t module_type;
  69
  70         /* Includes the DMC specific header in dwords */
  71         uint32_t header_len;
  72
  73         /* always value would be 0x10000 */
  74         uint32_t header_ver;
  75
  76         /* Not used */
  77         uint32_t module_id;
  78
  79         /* Not used */
  80         uint32_t module_vendor;
  81
  82         /* in YYYYMMDD format */
  83         uint32_t date;
  84
  85         /* Size in dwords (CSS_Headerlen + PackageHeaderLen + dmc FWsLen)/4 */
  86         uint32_t size;
  87
  88         /* Not used */
  89         uint32_t key_size;
  90
  91         /* Not used */
  92         uint32_t modulus_size;
  93
  94         /* Not used */
  95         uint32_t exponent_size;
  96
  97         /* Not used */
  98         uint32_t reserved1[12];
  99
 100         /* Major Minor */
 101         uint32_t version;
 102
 103         /* Not used */
 104         uint32_t reserved2[8];
 105
 106         /* Not used */
 107         uint32_t kernel_header_info;
 108 } __packed;
 109
 110 struct intel_fw_info {
 111         uint16_t reserved1;
 112
 113         /* Stepping (A, B, C, ..., *). * is a wildcard */
 114         char stepping;
 115
 116         /* Sub-stepping (0, 1, ..., *). * is a wildcard */
 117         char substepping;
 118
 119         uint32_t offset;
 120         uint32_t reserved2;
 121 } __packed;
 122
 123 struct intel_package_header {
 124         /* DMC container header length in dwords */
 125         unsigned char header_len;
 126
 127         /* always value would be 0x01 */
 128         unsigned char header_ver;
 129
 130         unsigned char reserved[10];
 131
 132         /* Number of valid entries in the FWInfo array below */
 133         uint32_t num_entries;
 134
 135         struct intel_fw_info fw_info[20];
 136 } __packed;
 137
 138 struct intel_dmc_header {
 139         /* always value would be 0x40403E3E */
 140         uint32_t signature;
 141
 142         /* DMC binary header length */
 143         unsigned char header_len;
 144
 145         /* 0x01 */
 146         unsigned char header_ver;
 147
 148         /* Reserved */
 149         uint16_t dmcc_ver;
 150
 151         /* Major, Minor */
 152         uint32_t        project;
 153
 154         /* Firmware program size (excluding header) in dwords */
 155         uint32_t        fw_size;
 156
 157         /* Major Minor version */
 158         uint32_t fw_version;
 159
 160         /* Number of valid MMIO cycles present. */
 161         uint32_t mmio_count;
 162
 163         /* MMIO address */
 164         uint32_t mmioaddr[8];
 165
 166         /* MMIO data */
 167         uint32_t mmiodata[8];
 168
 169         /* FW filename  */
 170         unsigned char dfile[32];
 171
 172         uint32_t reserved1[2];
 173 } __packed;
 174
 175 struct stepping_info {
 176         char stepping;
 177         char substepping;
 178 };
 179
 180 static const struct stepping_info skl_stepping_info[] = {
 181                 {'A', '0'}, {'B', '0'}, {'C', '0'},
 182                 {'D', '0'}, {'E', '0'}, {'F', '0'},
 183                 {'G', '0'}, {'H', '0'}, {'I', '0'}
 184 };
 185
 186 static struct stepping_info bxt_stepping_info[] = {
 187         {'A', '0'}, {'A', '1'}, {'A', '2'},
 188         {'B', '0'}, {'B', '1'}, {'B', '2'}
 189 };
 190
 191 static char intel_get_stepping(struct drm_device *dev)
 192 {
 193         if (IS_SKYLAKE(dev) && (dev->pdev->revision <
 194                         ARRAY_SIZE(skl_stepping_info)))
 195                 return skl_stepping_info[dev->pdev->revision].stepping;
 196         else if (IS_BROXTON(dev) && (dev->pdev->revision <
 197                                 ARRAY_SIZE(bxt_stepping_info)))
 198                 return bxt_stepping_info[dev->pdev->revision].stepping;
 199         else
 200                 return -ENODATA;
 201 }
 202
 203 static char intel_get_substepping(struct drm_device *dev)
 204 {
 205         if (IS_SKYLAKE(dev) && (dev->pdev->revision <
 206                         ARRAY_SIZE(skl_stepping_info)))
 207                 return skl_stepping_info[dev->pdev->revision].substepping;
 208         else if (IS_BROXTON(dev) && (dev->pdev->revision <
 209                         ARRAY_SIZE(bxt_stepping_info)))
 210                 return bxt_stepping_info[dev->pdev->revision].substepping;
 211         else
 212                 return -ENODATA;
 213 }
 214
 215 /**
 216  * intel_csr_load_status_get() - to get firmware loading status.
 217  * @dev_priv: i915 device.
 218  *
 219  * This function helps to get the firmware loading status.
 220  *
 221  * Return: Firmware loading status.
 222  */
 223 enum csr_state intel_csr_load_status_get(struct drm_i915_private *dev_priv)
 224 {
 225         enum csr_state state;
 226
 227         mutex_lock(&dev_priv->csr_lock);
 228         state = dev_priv->csr.state;
 229         mutex_unlock(&dev_priv->csr_lock);
 230
 231         return state;
 232 }
 233
 234 /**
 235  * intel_csr_load_status_set() - help to set firmware loading status.
 236  * @dev_priv: i915 device.
 237  * @state: enumeration of firmware loading status.
 238  *
 239  * Set the firmware loading status.
 240  */
 241 void intel_csr_load_status_set(struct drm_i915_private *dev_priv,
 242                         enum csr_state state)
 243 {
 244         mutex_lock(&dev_priv->csr_lock);
 245         dev_priv->csr.state = state;
 246         mutex_unlock(&dev_priv->csr_lock);
 247 }
 248
 249 /**
 250  * intel_csr_load_program() - write the firmware from memory to register.
 251  * @dev: drm device.
 252  *
 253  * CSR firmware is read from a .bin file and kept in internal memory one time.
 254  * Everytime display comes back from low power state this function is called to
 255  * copy the firmware from internal memory to registers.
 256  */
 257 void intel_csr_load_program(struct drm_device *dev)
 258 {
 259         struct drm_i915_private *dev_priv = dev->dev_private;
 260         u32 *payload = dev_priv->csr.dmc_payload;
 261         uint32_t i, fw_size;
 262
 263         if (!IS_GEN9(dev)) {
 264                 DRM_ERROR("No CSR support available for this platform\n");
 265                 return;
 266         }
 267
 268         /*
 269          * FIXME: Firmware gets lost on S3/S4, but not when entering system
 270          * standby or suspend-to-idle (which is just like forced runtime pm).
 271          * Unfortunately the ACPI subsystem doesn't yet give us a way to
 272          * differentiate this, hence figure it out with this hack.
 273          */
 274         if (I915_READ(CSR_PROGRAM(0)))
 275                 return;
 276
 277         mutex_lock(&dev_priv->csr_lock);
 278         fw_size = dev_priv->csr.dmc_fw_size;
 279         for (i = 0; i < fw_size; i++)
 280                 I915_WRITE(CSR_PROGRAM(i), payload[i]);
 281
 282         for (i = 0; i < dev_priv->csr.mmio_count; i++) {
 283                 I915_WRITE(dev_priv->csr.mmioaddr[i],
 284                         dev_priv->csr.mmiodata[i]);
 285         }
 286
 287         dev_priv->csr.state = FW_LOADED;
 288         mutex_unlock(&dev_priv->csr_lock);
 289 }
 290
 291 static void finish_csr_load(const struct firmware *fw, void *context)
 292 {
 293         struct drm_i915_private *dev_priv = context;
 294         struct drm_device *dev = dev_priv->dev;
 295         struct intel_css_header *css_header;
 296         struct intel_package_header *package_header;
 297         struct intel_dmc_header *dmc_header;
 298         struct intel_csr *csr = &dev_priv->csr;
 299         char stepping = intel_get_stepping(dev);
 300         char substepping = intel_get_substepping(dev);
 301         uint32_t dmc_offset = CSR_DEFAULT_FW_OFFSET, readcount = 0, nbytes;
 302         uint32_t i;
 303         uint32_t *dmc_payload;
 304         bool fw_loaded = false;
 305
 306         if (!fw) {
 307                 i915_firmware_load_error_print(csr->fw_path, 0);
 308                 goto out;
 309         }
 310
 311         if ((stepping == -ENODATA) || (substepping == -ENODATA)) {
 312                 DRM_ERROR("Unknown stepping info, firmware loading failed\n");
 313                 goto out;
 314         }
 315
 316         /* Extract CSS Header information*/
 317         css_header = (struct intel_css_header *)fw->data;
 318         if (sizeof(struct intel_css_header) !=
 319                 (css_header->header_len * 4)) {
 320                 DRM_ERROR("Firmware has wrong CSS header length %u bytes\n",
 321                         (css_header->header_len * 4));
 322                 goto out;
 323         }
 324         readcount += sizeof(struct intel_css_header);
 325
 326         /* Extract Package Header information*/
 327         package_header = (struct intel_package_header *)
 328                                         &fw->data[readcount];
 329         if (sizeof(struct intel_package_header) !=
 330                 (package_header->header_len * 4)) {
 331                 DRM_ERROR("Firmware has wrong package header length %u bytes\n",
 332                         (package_header->header_len * 4));
 333                 goto out;
 334         }
 335         readcount += sizeof(struct intel_package_header);
 336
 337         /* Search for dmc_offset to find firware binary. */
 338         for (i = 0; i < package_header->num_entries; i++) {
 339                 if (package_header->fw_info[i].substepping == '*' &&
 340                         stepping == package_header->fw_info[i].stepping) {
 341                         dmc_offset = package_header->fw_info[i].offset;
 342                         break;
 343                 } else if (stepping == package_header->fw_info[i].stepping &&
 344                         substepping == package_header->fw_info[i].substepping) {
 345                         dmc_offset = package_header->fw_info[i].offset;
 346                         break;
 347                 } else if (package_header->fw_info[i].stepping == '*' &&
 348                         package_header->fw_info[i].substepping == '*')
 349                         dmc_offset = package_header->fw_info[i].offset;
 350         }
 351         if (dmc_offset == CSR_DEFAULT_FW_OFFSET) {
 352                 DRM_ERROR("Firmware not supported for %c stepping\n", stepping);
 353                 goto out;
 354         }
 355         readcount += dmc_offset;
 356
 357         /* Extract dmc_header information. */
 358         dmc_header = (struct intel_dmc_header *)&fw->data[readcount];
 359         if (sizeof(struct intel_dmc_header) != (dmc_header->header_len)) {
 360                 DRM_ERROR("Firmware has wrong dmc header length %u bytes\n",
 361                                 (dmc_header->header_len));
 362                 goto out;
 363         }
 364         readcount += sizeof(struct intel_dmc_header);
 365
 366         /* Cache the dmc header info. */
 367         if (dmc_header->mmio_count > ARRAY_SIZE(csr->mmioaddr)) {
 368                 DRM_ERROR("Firmware has wrong mmio count %u\n",
 369                                                 dmc_header->mmio_count);
 370                 goto out;
 371         }
 372         csr->mmio_count = dmc_header->mmio_count;
 373         for (i = 0; i < dmc_header->mmio_count; i++) {
 374                 if (dmc_header->mmioaddr[i] < CSR_MMIO_START_RANGE ||
 375                         dmc_header->mmioaddr[i] > CSR_MMIO_END_RANGE) {
 376                         DRM_ERROR(" Firmware has wrong mmio address 0x%x\n",
 377                                                 dmc_header->mmioaddr[i]);
 378                         goto out;
 379                 }
 380                 csr->mmioaddr[i] = dmc_header->mmioaddr[i];
 381                 csr->mmiodata[i] = dmc_header->mmiodata[i];
 382         }
 383
 384         /* fw_size is in dwords, so multiplied by 4 to convert into bytes. */
 385         nbytes = dmc_header->fw_size * 4;
 386         if (nbytes > CSR_MAX_FW_SIZE) {
 387                 DRM_ERROR("CSR firmware too big (%u) bytes\n", nbytes);
 388                 goto out;
 389         }
 390         csr->dmc_fw_size = dmc_header->fw_size;
 391
 392         csr->dmc_payload = kmalloc(nbytes, GFP_KERNEL);
 393         if (!csr->dmc_payload) {
 394                 DRM_ERROR("Memory allocation failed for dmc payload\n");
 395                 goto out;
 396         }
 397
 398         dmc_payload = csr->dmc_payload;
 399         memcpy(dmc_payload, &fw->data[readcount], nbytes);
 400
 401         /* load csr program during system boot, as needed for DC states */
 402         intel_csr_load_program(dev);
 403         fw_loaded = true;
 404
 405         DRM_DEBUG_KMS("Finished loading %s\n", dev_priv->csr.fw_path);
 406 out:
 407         if (fw_loaded)
 408                 intel_runtime_pm_put(dev_priv);
 409         else
 410                 intel_csr_load_status_set(dev_priv, FW_FAILED);
 411
 412         release_firmware(fw);
 413 }
 414
 415 /**
 416  * intel_csr_ucode_init() - initialize the firmware loading.
 417  * @dev: drm device.
 418  *
 419  * This function is called at the time of loading the display driver to read
 420  * firmware from a .bin file and copied into a internal memory.
 421  */
 422 void intel_csr_ucode_init(struct drm_device *dev)
 423 {
 424         struct drm_i915_private *dev_priv = dev->dev_private;
 425         struct intel_csr *csr = &dev_priv->csr;
 426         int ret;
 427
 428         if (!HAS_CSR(dev))
 429                 return;
 430
 431         if (IS_SKYLAKE(dev))
 432                 csr->fw_path = I915_CSR_SKL;
 433         else if (IS_BROXTON(dev_priv))
 434                 csr->fw_path = I915_CSR_BXT;
 435         else {
 436                 DRM_ERROR("Unexpected: no known CSR firmware for platform\n");
 437                 intel_csr_load_status_set(dev_priv, FW_FAILED);
 438                 return;
 439         }
 440
 441         DRM_DEBUG_KMS("Loading %s\n", csr->fw_path);
 442
 443         /*
 444          * Obtain a runtime pm reference, until CSR is loaded,
 445          * to avoid entering runtime-suspend.
 446          */
 447         intel_runtime_pm_get(dev_priv);
 448
 449         /* CSR supported for platform, load firmware */
 450         ret = request_firmware_nowait(THIS_MODULE, true, csr->fw_path,
 451                                 &dev_priv->dev->pdev->dev,
 452                                 GFP_KERNEL, dev_priv,
 453                                 finish_csr_load);
 454         if (ret) {
 455                 i915_firmware_load_error_print(csr->fw_path, ret);
 456                 intel_csr_load_status_set(dev_priv, FW_FAILED);
 457         }
 458 }
 459
 460 /**
 461  * intel_csr_ucode_fini() - unload the CSR firmware.
 462  * @dev: drm device.
 463  *
 464  * Firmmware unloading includes freeing the internal momory and reset the
 465  * firmware loading status.
 466  */
 467 void intel_csr_ucode_fini(struct drm_device *dev)
 468 {
 469         struct drm_i915_private *dev_priv = dev->dev_private;
 470
 471         if (!HAS_CSR(dev))
 472                 return;
 473
 474         intel_csr_load_status_set(dev_priv, FW_FAILED);
 475         kfree(dev_priv->csr.dmc_payload);
 476 }
 477
 478 void assert_csr_loaded(struct drm_i915_private *dev_priv)
 479 {
 480         WARN_ONCE(intel_csr_load_status_get(dev_priv) != FW_LOADED,
 481                   "CSR is not loaded.\n");
 482         WARN_ONCE(!I915_READ(CSR_PROGRAM(0)),
 483                   "CSR program storage start is NULL\n");
 484         WARN_ONCE(!I915_READ(CSR_SSP_BASE), "CSR SSP Base Not fine\n");
 485         WARN_ONCE(!I915_READ(CSR_HTP_SKL), "CSR HTP Not fine\n");
 486 }