drivers/gpu/drm/ast/ast_main.c

   1 /*
   2  * Copyright 2012 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sub license, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  14  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  15  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  16  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  17  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  18  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  19  *
  20  * The above copyright notice and this permission notice (including the
  21  * next paragraph) shall be included in all copies or substantial portions
  22  * of the Software.
  23  *
  24  */
  25 /*
  26  * Authors: Dave Airlie <airlied@redhat.com>
  27  */
  28 #include <drm/drmP.h>
  29 #include "ast_drv.h"
  30
  31
  32 #include <drm/drm_fb_helper.h>
  33 #include <drm/drm_crtc_helper.h>
  34
  35 void ast_set_index_reg_mask(struct ast_private *ast,
  36                             uint32_t base, uint8_t index,
  37                             uint8_t mask, uint8_t val)
  38 {
  39         u8 tmp;
  40         ast_io_write8(ast, base, index);
  41         tmp = (ast_io_read8(ast, base + 1) & mask) | val;
  42         ast_set_index_reg(ast, base, index, tmp);
  43 }
  44
  45 uint8_t ast_get_index_reg(struct ast_private *ast,
  46                           uint32_t base, uint8_t index)
  47 {
  48         uint8_t ret;
  49         ast_io_write8(ast, base, index);
  50         ret = ast_io_read8(ast, base + 1);
  51         return ret;
  52 }
  53
  54 uint8_t ast_get_index_reg_mask(struct ast_private *ast,
  55                                uint32_t base, uint8_t index, uint8_t mask)
  56 {
  57         uint8_t ret;
  58         ast_io_write8(ast, base, index);
  59         ret = ast_io_read8(ast, base + 1) & mask;
  60         return ret;
  61 }
  62
  63 static void ast_detect_config_mode(struct drm_device *dev, u32 *scu_rev)
  64 {
  65         struct device_node *np = dev->pdev->dev.of_node;
  66         struct ast_private *ast = dev->dev_private;
  67         uint32_t data, jregd0, jregd1;
  68
  69         /* Defaults */
  70         ast->config_mode = ast_use_defaults;
  71         *scu_rev = 0xffffffff;
  72
  73         /* Check if we have device-tree properties */
  74         if (np && !of_property_read_u32(np, "aspeed,scu-revision-id",
  75                                         scu_rev)) {
  76                 /* We do, disable P2A access */
  77                 ast->config_mode = ast_use_dt;
  78                 DRM_INFO("Using device-tree for configuration\n");
  79                 return;
  80         }
  81
  82         /* Not all families have a P2A bridge */
  83         if (dev->pdev->device != PCI_CHIP_AST2000)
  84                 return;
  85
  86         /*
  87          * The BMC will set SCU 0x40 D[12] to 1 if the P2 bridge
  88          * is disabled. We force using P2A if VGA only mode bit
  89          * is set D[7]
  90          */
  91         jregd0 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
  92         jregd1 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
  93         if (!(jregd0 & 0x80) || !(jregd1 & 0x10)) {
  94                 /* Double check it's actually working */
  95                 data = ast_read32(ast, 0xf004);
  96                 if (data != 0xFFFFFFFF) {
  97                         /* P2A works, grab silicon revision */
  98                         ast->config_mode = ast_use_p2a;
  99
 100                         DRM_INFO("Using P2A bridge for configuration\n");
 101
 102                         /* Read SCU7c (silicon revision register) */
 103                         ast_write32(ast, 0xf004, 0x1e6e0000);
 104                         ast_write32(ast, 0xf000, 0x1);
 105                         *scu_rev = ast_read32(ast, 0x1207c);
 106                         return;
 107                 }
 108         }
 109
 110         /* We have a P2A bridge but it's disabled */
 111         DRM_INFO("P2A bridge disabled, using default configuration\n");
 112 }
 113
 114 static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 115 {
 116         struct ast_private *ast = dev->dev_private;
 117         uint32_t jreg, scu_rev;
 118
 119         /*
 120          * If VGA isn't enabled, we need to enable now or subsequent
 121          * access to the scratch registers will fail. We also inform
 122          * our caller that it needs to POST the chip
 123          * (Assumption: VGA not enabled -> need to POST)
 124          */
 125         if (!ast_is_vga_enabled(dev)) {
 126                 ast_enable_vga(dev);
 127                 DRM_INFO("VGA not enabled on entry, requesting chip POST\n");
 128                 *need_post = true;
 129         } else
 130                 *need_post = false;
 131
 132
 133         /* Enable extended register access */
 134         ast_open_key(ast);
 135         ast_enable_mmio(dev);
 136
 137         /* Find out whether P2A works or whether to use device-tree */
 138         ast_detect_config_mode(dev, &scu_rev);
 139
 140         /* Identify chipset */
 141         if (dev->pdev->device == PCI_CHIP_AST1180) {
 142                 ast->chip = AST1100;
 143                 DRM_INFO("AST 1180 detected\n");
 144         } else {
 145                 if (dev->pdev->revision >= 0x40) {
 146                         ast->chip = AST2500;
 147                         DRM_INFO("AST 2500 detected\n");
 148                 } else if (dev->pdev->revision >= 0x30) {
 149                         ast->chip = AST2400;
 150                         DRM_INFO("AST 2400 detected\n");
 151                 } else if (dev->pdev->revision >= 0x20) {
 152                         ast->chip = AST2300;
 153                         DRM_INFO("AST 2300 detected\n");
 154                 } else if (dev->pdev->revision >= 0x10) {
 155                         switch (scu_rev & 0x0300) {
 156                         case 0x0200:
 157                                 ast->chip = AST1100;
 158                                 DRM_INFO("AST 1100 detected\n");
 159                                 break;
 160                         case 0x0100:
 161                                 ast->chip = AST2200;
 162                                 DRM_INFO("AST 2200 detected\n");
 163                                 break;
 164                         case 0x0000:
 165                                 ast->chip = AST2150;
 166                                 DRM_INFO("AST 2150 detected\n");
 167                                 break;
 168                         default:
 169                                 ast->chip = AST2100;
 170                                 DRM_INFO("AST 2100 detected\n");
 171                                 break;
 172                         }
 173                         ast->vga2_clone = false;
 174                 } else {
 175                         ast->chip = AST2000;
 176                         DRM_INFO("AST 2000 detected\n");
 177                 }
 178         }
 179
 180         /* Check if we support wide screen */
 181         switch (ast->chip) {
 182         case AST1180:
 183                 ast->support_wide_screen = true;
 184                 break;
 185         case AST2000:
 186                 ast->support_wide_screen = false;
 187                 break;
 188         default:
 189                 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
 190                 if (!(jreg & 0x80))
 191                         ast->support_wide_screen = true;
 192                 else if (jreg & 0x01)
 193                         ast->support_wide_screen = true;
 194                 else {
 195                         ast->support_wide_screen = false;
 196                         if (ast->chip == AST2300 &&
 197                             (scu_rev & 0x300) == 0x0) /* ast1300 */
 198                                 ast->support_wide_screen = true;
 199                         if (ast->chip == AST2400 &&
 200                             (scu_rev & 0x300) == 0x100) /* ast1400 */
 201                                 ast->support_wide_screen = true;
 202                         if (ast->chip == AST2500 &&
 203                             scu_rev == 0x100)           /* ast2510 */
 204                                 ast->support_wide_screen = true;
 205                 }
 206                 break;
 207         }
 208
 209         /* Check 3rd Tx option (digital output afaik) */
 210         ast->tx_chip_type = AST_TX_NONE;
 211
 212         /*
 213          * VGACRA3 Enhanced Color Mode Register, check if DVO is already
 214          * enabled, in that case, assume we have a SIL164 TMDS transmitter
 215          *
 216          * Don't make that assumption if we the chip wasn't enabled and
 217          * is at power-on reset, otherwise we'll incorrectly "detect" a
 218          * SIL164 when there is none.
 219          */
 220         if (!*need_post) {
 221                 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa3, 0xff);
 222                 if (jreg & 0x80)
 223                         ast->tx_chip_type = AST_TX_SIL164;
 224         }
 225
 226         if ((ast->chip == AST2300) || (ast->chip == AST2400)) {
 227                 /*
 228                  * On AST2300 and 2400, look the configuration set by the SoC in
 229                  * the SOC scratch register #1 bits 11:8 (interestingly marked
 230                  * as "reserved" in the spec)
 231                  */
 232                 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
 233                 switch (jreg) {
 234                 case 0x04:
 235                         ast->tx_chip_type = AST_TX_SIL164;
 236                         break;
 237                 case 0x08:
 238                         ast->dp501_fw_addr = kzalloc(32*1024, GFP_KERNEL);
 239                         if (ast->dp501_fw_addr) {
 240                                 /* backup firmware */
 241                                 if (ast_backup_fw(dev, ast->dp501_fw_addr, 32*1024)) {
 242                                         kfree(ast->dp501_fw_addr);
 243                                         ast->dp501_fw_addr = NULL;
 244                                 }
 245                         }
 246                         /* fallthrough */
 247                 case 0x0c:
 248                         ast->tx_chip_type = AST_TX_DP501;
 249                 }
 250         }
 251
 252         /* Print stuff for diagnostic purposes */
 253         switch(ast->tx_chip_type) {
 254         case AST_TX_SIL164:
 255                 DRM_INFO("Using Sil164 TMDS transmitter\n");
 256                 break;
 257         case AST_TX_DP501:
 258                 DRM_INFO("Using DP501 DisplayPort transmitter\n");
 259                 break;
 260         default:
 261                 DRM_INFO("Analog VGA only\n");
 262         }
 263         return 0;
 264 }
 265
 266 static int ast_get_dram_info(struct drm_device *dev)
 267 {
 268         struct device_node *np = dev->pdev->dev.of_node;
 269         struct ast_private *ast = dev->dev_private;
 270         uint32_t mcr_cfg, mcr_scu_mpll, mcr_scu_strap;
 271         uint32_t denum, num, div, ref_pll, dsel;
 272
 273         switch (ast->config_mode) {
 274         case ast_use_dt:
 275                 /*
 276                  * If some properties are missing, use reasonable
 277                  * defaults for AST2400
 278                  */
 279                 if (of_property_read_u32(np, "aspeed,mcr-configuration",
 280                                          &mcr_cfg))
 281                         mcr_cfg = 0x00000577;
 282                 if (of_property_read_u32(np, "aspeed,mcr-scu-mpll",
 283                                          &mcr_scu_mpll))
 284                         mcr_scu_mpll = 0x000050C0;
 285                 if (of_property_read_u32(np, "aspeed,mcr-scu-strap",
 286                                          &mcr_scu_strap))
 287                         mcr_scu_strap = 0;
 288                 break;
 289         case ast_use_p2a:
 290                 ast_write32(ast, 0xf004, 0x1e6e0000);
 291                 ast_write32(ast, 0xf000, 0x1);
 292                 mcr_cfg = ast_read32(ast, 0x10004);
 293                 mcr_scu_mpll = ast_read32(ast, 0x10120);
 294                 mcr_scu_strap = ast_read32(ast, 0x10170);
 295                 break;
 296         case ast_use_defaults:
 297         default:
 298                 ast->dram_bus_width = 16;
 299                 ast->dram_type = AST_DRAM_1Gx16;
 300                 if (ast->chip == AST2500)
 301                         ast->mclk = 800;
 302                 else
 303                         ast->mclk = 396;
 304                 return 0;
 305         }
 306
 307         if (mcr_cfg & 0x40)
 308                 ast->dram_bus_width = 16;
 309         else
 310                 ast->dram_bus_width = 32;
 311
 312         if (ast->chip == AST2500) {
 313                 switch (mcr_cfg & 0x03) {
 314                 case 0:
 315                         ast->dram_type = AST_DRAM_1Gx16;
 316                         break;
 317                 default:
 318                 case 1:
 319                         ast->dram_type = AST_DRAM_2Gx16;
 320                         break;
 321                 case 2:
 322                         ast->dram_type = AST_DRAM_4Gx16;
 323                         break;
 324                 case 3:
 325                         ast->dram_type = AST_DRAM_8Gx16;
 326                         break;
 327                 }
 328         } else if (ast->chip == AST2300 || ast->chip == AST2400) {
 329                 switch (mcr_cfg & 0x03) {
 330                 case 0:
 331                         ast->dram_type = AST_DRAM_512Mx16;
 332                         break;
 333                 default:
 334                 case 1:
 335                         ast->dram_type = AST_DRAM_1Gx16;
 336                         break;
 337                 case 2:
 338                         ast->dram_type = AST_DRAM_2Gx16;
 339                         break;
 340                 case 3:
 341                         ast->dram_type = AST_DRAM_4Gx16;
 342                         break;
 343                 }
 344         } else {
 345                 switch (mcr_cfg & 0x0c) {
 346                 case 0:
 347                 case 4:
 348                         ast->dram_type = AST_DRAM_512Mx16;
 349                         break;
 350                 case 8:
 351                         if (mcr_cfg & 0x40)
 352                                 ast->dram_type = AST_DRAM_1Gx16;
 353                         else
 354                                 ast->dram_type = AST_DRAM_512Mx32;
 355                         break;
 356                 case 0xc:
 357                         ast->dram_type = AST_DRAM_1Gx32;
 358                         break;
 359                 }
 360         }
 361
 362         if (mcr_scu_strap & 0x2000)
 363                 ref_pll = 14318;
 364         else
 365                 ref_pll = 12000;
 366
 367         denum = mcr_scu_mpll & 0x1f;
 368         num = (mcr_scu_mpll & 0x3fe0) >> 5;
 369         dsel = (mcr_scu_mpll & 0xc000) >> 14;
 370         switch (dsel) {
 371         case 3:
 372                 div = 0x4;
 373                 break;
 374         case 2:
 375         case 1:
 376                 div = 0x2;
 377                 break;
 378         default:
 379                 div = 0x1;
 380                 break;
 381         }
 382         ast->mclk = ref_pll * (num + 2) / ((denum + 2) * (div * 1000));
 383         return 0;
 384 }
 385
 386 static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb)
 387 {
 388         struct ast_framebuffer *ast_fb = to_ast_framebuffer(fb);
 389
 390         drm_gem_object_put_unlocked(ast_fb->obj);
 391         drm_framebuffer_cleanup(fb);
 392         kfree(ast_fb);
 393 }
 394
 395 static const struct drm_framebuffer_funcs ast_fb_funcs = {
 396         .destroy = ast_user_framebuffer_destroy,
 397 };
 398
 399
 400 int ast_framebuffer_init(struct drm_device *dev,
 401                          struct ast_framebuffer *ast_fb,
 402                          const struct drm_mode_fb_cmd2 *mode_cmd,
 403                          struct drm_gem_object *obj)
 404 {
 405         int ret;
 406
 407         drm_helper_mode_fill_fb_struct(dev, &ast_fb->base, mode_cmd);
 408         ast_fb->obj = obj;
 409         ret = drm_framebuffer_init(dev, &ast_fb->base, &ast_fb_funcs);
 410         if (ret) {
 411                 DRM_ERROR("framebuffer init failed %d\n", ret);
 412                 return ret;
 413         }
 414         return 0;
 415 }
 416
 417 static struct drm_framebuffer *
 418 ast_user_framebuffer_create(struct drm_device *dev,
 419                struct drm_file *filp,
 420                const struct drm_mode_fb_cmd2 *mode_cmd)
 421 {
 422         struct drm_gem_object *obj;
 423         struct ast_framebuffer *ast_fb;
 424         int ret;
 425
 426         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 427         if (obj == NULL)
 428                 return ERR_PTR(-ENOENT);
 429
 430         ast_fb = kzalloc(sizeof(*ast_fb), GFP_KERNEL);
 431         if (!ast_fb) {
 432                 drm_gem_object_put_unlocked(obj);
 433                 return ERR_PTR(-ENOMEM);
 434         }
 435
 436         ret = ast_framebuffer_init(dev, ast_fb, mode_cmd, obj);
 437         if (ret) {
 438                 drm_gem_object_put_unlocked(obj);
 439                 kfree(ast_fb);
 440                 return ERR_PTR(ret);
 441         }
 442         return &ast_fb->base;
 443 }
 444
 445 static const struct drm_mode_config_funcs ast_mode_funcs = {
 446         .fb_create = ast_user_framebuffer_create,
 447 };
 448
 449 static u32 ast_get_vram_info(struct drm_device *dev)
 450 {
 451         struct ast_private *ast = dev->dev_private;
 452         u8 jreg;
 453         u32 vram_size;
 454         ast_open_key(ast);
 455
 456         vram_size = AST_VIDMEM_DEFAULT_SIZE;
 457         jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
 458         switch (jreg & 3) {
 459         case 0: vram_size = AST_VIDMEM_SIZE_8M; break;
 460         case 1: vram_size = AST_VIDMEM_SIZE_16M; break;
 461         case 2: vram_size = AST_VIDMEM_SIZE_32M; break;
 462         case 3: vram_size = AST_VIDMEM_SIZE_64M; break;
 463         }
 464
 465         jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff);
 466         switch (jreg & 0x03) {
 467         case 1:
 468                 vram_size -= 0x100000;
 469                 break;
 470         case 2:
 471                 vram_size -= 0x200000;
 472                 break;
 473         case 3:
 474                 vram_size -= 0x400000;
 475                 break;
 476         }
 477
 478         return vram_size;
 479 }
 480
 481 int ast_driver_load(struct drm_device *dev, unsigned long flags)
 482 {
 483         struct ast_private *ast;
 484         bool need_post;
 485         int ret = 0;
 486
 487         ast = kzalloc(sizeof(struct ast_private), GFP_KERNEL);
 488         if (!ast)
 489                 return -ENOMEM;
 490
 491         dev->dev_private = ast;
 492         ast->dev = dev;
 493
 494         ast->regs = pci_iomap(dev->pdev, 1, 0);
 495         if (!ast->regs) {
 496                 ret = -EIO;
 497                 goto out_free;
 498         }
 499
 500         /*
 501          * If we don't have IO space at all, use MMIO now and
 502          * assume the chip has MMIO enabled by default (rev 0x20
 503          * and higher).
 504          */
 505         if (!(pci_resource_flags(dev->pdev, 2) & IORESOURCE_IO)) {
 506                 DRM_INFO("platform has no IO space, trying MMIO\n");
 507                 ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
 508         }
 509
 510         /* "map" IO regs if the above hasn't done so already */
 511         if (!ast->ioregs) {
 512                 ast->ioregs = pci_iomap(dev->pdev, 2, 0);
 513                 if (!ast->ioregs) {
 514                         ret = -EIO;
 515                         goto out_free;
 516                 }
 517         }
 518
 519         ast_detect_chip(dev, &need_post);
 520
 521         if (need_post)
 522                 ast_post_gpu(dev);
 523
 524         if (ast->chip != AST1180) {
 525                 ret = ast_get_dram_info(dev);
 526                 if (ret)
 527                         goto out_free;
 528                 ast->vram_size = ast_get_vram_info(dev);
 529                 DRM_INFO("dram MCLK=%u Mhz type=%d bus_width=%d size=%08x\n",
 530                          ast->mclk, ast->dram_type,
 531                          ast->dram_bus_width, ast->vram_size);
 532         }
 533
 534         ret = ast_mm_init(ast);
 535         if (ret)
 536                 goto out_free;
 537
 538         drm_mode_config_init(dev);
 539
 540         dev->mode_config.funcs = (void *)&ast_mode_funcs;
 541         dev->mode_config.min_width = 0;
 542         dev->mode_config.min_height = 0;
 543         dev->mode_config.preferred_depth = 24;
 544         dev->mode_config.prefer_shadow = 1;
 545         dev->mode_config.fb_base = pci_resource_start(ast->dev->pdev, 0);
 546
 547         if (ast->chip == AST2100 ||
 548             ast->chip == AST2200 ||
 549             ast->chip == AST2300 ||
 550             ast->chip == AST2400 ||
 551             ast->chip == AST2500 ||
 552             ast->chip == AST1180) {
 553                 dev->mode_config.max_width = 1920;
 554                 dev->mode_config.max_height = 2048;
 555         } else {
 556                 dev->mode_config.max_width = 1600;
 557                 dev->mode_config.max_height = 1200;
 558         }
 559
 560         ret = ast_mode_init(dev);
 561         if (ret)
 562                 goto out_free;
 563
 564         ret = ast_fbdev_init(dev);
 565         if (ret)
 566                 goto out_free;
 567
 568         return 0;
 569 out_free:
 570         kfree(ast);
 571         dev->dev_private = NULL;
 572         return ret;
 573 }
 574
 575 void ast_driver_unload(struct drm_device *dev)
 576 {
 577         struct ast_private *ast = dev->dev_private;
 578
 579         /* enable standard VGA decode */
 580         ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x04);
 581
 582         ast_release_firmware(dev);
 583         kfree(ast->dp501_fw_addr);
 584         ast_mode_fini(dev);
 585         ast_fbdev_fini(dev);
 586         drm_mode_config_cleanup(dev);
 587
 588         ast_mm_fini(ast);
 589         if (ast->ioregs != ast->regs + AST_IO_MM_OFFSET)
 590                 pci_iounmap(dev->pdev, ast->ioregs);
 591         pci_iounmap(dev->pdev, ast->regs);
 592         kfree(ast);
 593 }
 594
 595 int ast_gem_create(struct drm_device *dev,
 596                    u32 size, bool iskernel,
 597                    struct drm_gem_object **obj)
 598 {
 599         struct ast_bo *astbo;
 600         int ret;
 601
 602         *obj = NULL;
 603
 604         size = roundup(size, PAGE_SIZE);
 605         if (size == 0)
 606                 return -EINVAL;
 607
 608         ret = ast_bo_create(dev, size, 0, 0, &astbo);
 609         if (ret) {
 610                 if (ret != -ERESTARTSYS)
 611                         DRM_ERROR("failed to allocate GEM object\n");
 612                 return ret;
 613         }
 614         *obj = &astbo->gem;
 615         return 0;
 616 }
 617
 618 int ast_dumb_create(struct drm_file *file,
 619                     struct drm_device *dev,
 620                     struct drm_mode_create_dumb *args)
 621 {
 622         int ret;
 623         struct drm_gem_object *gobj;
 624         u32 handle;
 625
 626         args->pitch = args->width * ((args->bpp + 7) / 8);
 627         args->size = args->pitch * args->height;
 628
 629         ret = ast_gem_create(dev, args->size, false,
 630                              &gobj);
 631         if (ret)
 632                 return ret;
 633
 634         ret = drm_gem_handle_create(file, gobj, &handle);
 635         drm_gem_object_put_unlocked(gobj);
 636         if (ret)
 637                 return ret;
 638
 639         args->handle = handle;
 640         return 0;
 641 }
 642
 643 static void ast_bo_unref(struct ast_bo **bo)
 644 {
 645         struct ttm_buffer_object *tbo;
 646
 647         if ((*bo) == NULL)
 648                 return;
 649
 650         tbo = &((*bo)->bo);
 651         ttm_bo_unref(&tbo);
 652         *bo = NULL;
 653 }
 654
 655 void ast_gem_free_object(struct drm_gem_object *obj)
 656 {
 657         struct ast_bo *ast_bo = gem_to_ast_bo(obj);
 658
 659         ast_bo_unref(&ast_bo);
 660 }
 661
 662
 663 static inline u64 ast_bo_mmap_offset(struct ast_bo *bo)
 664 {
 665         return drm_vma_node_offset_addr(&bo->bo.vma_node);
 666 }
 667 int
 668 ast_dumb_mmap_offset(struct drm_file *file,
 669                      struct drm_device *dev,
 670                      uint32_t handle,
 671                      uint64_t *offset)
 672 {
 673         struct drm_gem_object *obj;
 674         struct ast_bo *bo;
 675
 676         obj = drm_gem_object_lookup(file, handle);
 677         if (obj == NULL)
 678                 return -ENOENT;
 679
 680         bo = gem_to_ast_bo(obj);
 681         *offset = ast_bo_mmap_offset(bo);
 682
 683         drm_gem_object_put_unlocked(obj);
 684
 685         return 0;
 686
 687 }
 688