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
  29 #include <linux/pci.h>
  30
  31 #include <drm/drm_atomic_helper.h>
  32 #include <drm/drm_crtc_helper.h>
  33 #include <drm/drm_fb_helper.h>
  34 #include <drm/drm_gem.h>
  35 #include <drm/drm_gem_framebuffer_helper.h>
  36 #include <drm/drm_gem_vram_helper.h>
  37
  38 #include "ast_drv.h"
  39
  40 void ast_set_index_reg_mask(struct ast_private *ast,
  41                             uint32_t base, uint8_t index,
  42                             uint8_t mask, uint8_t val)
  43 {
  44         u8 tmp;
  45         ast_io_write8(ast, base, index);
  46         tmp = (ast_io_read8(ast, base + 1) & mask) | val;
  47         ast_set_index_reg(ast, base, index, tmp);
  48 }
  49
  50 uint8_t ast_get_index_reg(struct ast_private *ast,
  51                           uint32_t base, uint8_t index)
  52 {
  53         uint8_t ret;
  54         ast_io_write8(ast, base, index);
  55         ret = ast_io_read8(ast, base + 1);
  56         return ret;
  57 }
  58
  59 uint8_t ast_get_index_reg_mask(struct ast_private *ast,
  60                                uint32_t base, uint8_t index, uint8_t mask)
  61 {
  62         uint8_t ret;
  63         ast_io_write8(ast, base, index);
  64         ret = ast_io_read8(ast, base + 1) & mask;
  65         return ret;
  66 }
  67
  68 static void ast_detect_config_mode(struct drm_device *dev, u32 *scu_rev)
  69 {
  70         struct device_node *np = dev->pdev->dev.of_node;
  71         struct ast_private *ast = dev->dev_private;
  72         uint32_t data, jregd0, jregd1;
  73
  74         /* Defaults */
  75         ast->config_mode = ast_use_defaults;
  76         *scu_rev = 0xffffffff;
  77
  78         /* Check if we have device-tree properties */
  79         if (np && !of_property_read_u32(np, "aspeed,scu-revision-id",
  80                                         scu_rev)) {
  81                 /* We do, disable P2A access */
  82                 ast->config_mode = ast_use_dt;
  83                 DRM_INFO("Using device-tree for configuration\n");
  84                 return;
  85         }
  86
  87         /* Not all families have a P2A bridge */
  88         if (dev->pdev->device != PCI_CHIP_AST2000)
  89                 return;
  90
  91         /*
  92          * The BMC will set SCU 0x40 D[12] to 1 if the P2 bridge
  93          * is disabled. We force using P2A if VGA only mode bit
  94          * is set D[7]
  95          */
  96         jregd0 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
  97         jregd1 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
  98         if (!(jregd0 & 0x80) || !(jregd1 & 0x10)) {
  99                 /* Double check it's actually working */
 100                 data = ast_read32(ast, 0xf004);
 101                 if (data != 0xFFFFFFFF) {
 102                         /* P2A works, grab silicon revision */
 103                         ast->config_mode = ast_use_p2a;
 104
 105                         DRM_INFO("Using P2A bridge for configuration\n");
 106
 107                         /* Read SCU7c (silicon revision register) */
 108                         ast_write32(ast, 0xf004, 0x1e6e0000);
 109                         ast_write32(ast, 0xf000, 0x1);
 110                         *scu_rev = ast_read32(ast, 0x1207c);
 111                         return;
 112                 }
 113         }
 114
 115         /* We have a P2A bridge but it's disabled */
 116         DRM_INFO("P2A bridge disabled, using default configuration\n");
 117 }
 118
 119 static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 120 {
 121         struct ast_private *ast = dev->dev_private;
 122         uint32_t jreg, scu_rev;
 123
 124         /*
 125          * If VGA isn't enabled, we need to enable now or subsequent
 126          * access to the scratch registers will fail. We also inform
 127          * our caller that it needs to POST the chip
 128          * (Assumption: VGA not enabled -> need to POST)
 129          */
 130         if (!ast_is_vga_enabled(dev)) {
 131                 ast_enable_vga(dev);
 132                 DRM_INFO("VGA not enabled on entry, requesting chip POST\n");
 133                 *need_post = true;
 134         } else
 135                 *need_post = false;
 136
 137
 138         /* Enable extended register access */
 139         ast_open_key(ast);
 140         ast_enable_mmio(dev);
 141
 142         /* Find out whether P2A works or whether to use device-tree */
 143         ast_detect_config_mode(dev, &scu_rev);
 144
 145         /* Identify chipset */
 146         if (dev->pdev->device == PCI_CHIP_AST1180) {
 147                 ast->chip = AST1100;
 148                 DRM_INFO("AST 1180 detected\n");
 149         } else {
 150                 if (dev->pdev->revision >= 0x40) {
 151                         ast->chip = AST2500;
 152                         DRM_INFO("AST 2500 detected\n");
 153                 } else if (dev->pdev->revision >= 0x30) {
 154                         ast->chip = AST2400;
 155                         DRM_INFO("AST 2400 detected\n");
 156                 } else if (dev->pdev->revision >= 0x20) {
 157                         ast->chip = AST2300;
 158                         DRM_INFO("AST 2300 detected\n");
 159                 } else if (dev->pdev->revision >= 0x10) {
 160                         switch (scu_rev & 0x0300) {
 161                         case 0x0200:
 162                                 ast->chip = AST1100;
 163                                 DRM_INFO("AST 1100 detected\n");
 164                                 break;
 165                         case 0x0100:
 166                                 ast->chip = AST2200;
 167                                 DRM_INFO("AST 2200 detected\n");
 168                                 break;
 169                         case 0x0000:
 170                                 ast->chip = AST2150;
 171                                 DRM_INFO("AST 2150 detected\n");
 172                                 break;
 173                         default:
 174                                 ast->chip = AST2100;
 175                                 DRM_INFO("AST 2100 detected\n");
 176                                 break;
 177                         }
 178                         ast->vga2_clone = false;
 179                 } else {
 180                         ast->chip = AST2000;
 181                         DRM_INFO("AST 2000 detected\n");
 182                 }
 183         }
 184
 185         /* Check if we support wide screen */
 186         switch (ast->chip) {
 187         case AST1180:
 188                 ast->support_wide_screen = true;
 189                 break;
 190         case AST2000:
 191                 ast->support_wide_screen = false;
 192                 break;
 193         default:
 194                 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd0, 0xff);
 195                 if (!(jreg & 0x80))
 196                         ast->support_wide_screen = true;
 197                 else if (jreg & 0x01)
 198                         ast->support_wide_screen = true;
 199                 else {
 200                         ast->support_wide_screen = false;
 201                         if (ast->chip == AST2300 &&
 202                             (scu_rev & 0x300) == 0x0) /* ast1300 */
 203                                 ast->support_wide_screen = true;
 204                         if (ast->chip == AST2400 &&
 205                             (scu_rev & 0x300) == 0x100) /* ast1400 */
 206                                 ast->support_wide_screen = true;
 207                         if (ast->chip == AST2500 &&
 208                             scu_rev == 0x100)           /* ast2510 */
 209                                 ast->support_wide_screen = true;
 210                 }
 211                 break;
 212         }
 213
 214         /* Check 3rd Tx option (digital output afaik) */
 215         ast->tx_chip_type = AST_TX_NONE;
 216
 217         /*
 218          * VGACRA3 Enhanced Color Mode Register, check if DVO is already
 219          * enabled, in that case, assume we have a SIL164 TMDS transmitter
 220          *
 221          * Don't make that assumption if we the chip wasn't enabled and
 222          * is at power-on reset, otherwise we'll incorrectly "detect" a
 223          * SIL164 when there is none.
 224          */
 225         if (!*need_post) {
 226                 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xa3, 0xff);
 227                 if (jreg & 0x80)
 228                         ast->tx_chip_type = AST_TX_SIL164;
 229         }
 230
 231         if ((ast->chip == AST2300) || (ast->chip == AST2400)) {
 232                 /*
 233                  * On AST2300 and 2400, look the configuration set by the SoC in
 234                  * the SOC scratch register #1 bits 11:8 (interestingly marked
 235                  * as "reserved" in the spec)
 236                  */
 237                 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xd1, 0xff);
 238                 switch (jreg) {
 239                 case 0x04:
 240                         ast->tx_chip_type = AST_TX_SIL164;
 241                         break;
 242                 case 0x08:
 243                         ast->dp501_fw_addr = kzalloc(32*1024, GFP_KERNEL);
 244                         if (ast->dp501_fw_addr) {
 245                                 /* backup firmware */
 246                                 if (ast_backup_fw(dev, ast->dp501_fw_addr, 32*1024)) {
 247                                         kfree(ast->dp501_fw_addr);
 248                                         ast->dp501_fw_addr = NULL;
 249                                 }
 250                         }
 251                         /* fallthrough */
 252                 case 0x0c:
 253                         ast->tx_chip_type = AST_TX_DP501;
 254                 }
 255         }
 256
 257         /* Print stuff for diagnostic purposes */
 258         switch(ast->tx_chip_type) {
 259         case AST_TX_SIL164:
 260                 DRM_INFO("Using Sil164 TMDS transmitter\n");
 261                 break;
 262         case AST_TX_DP501:
 263                 DRM_INFO("Using DP501 DisplayPort transmitter\n");
 264                 break;
 265         default:
 266                 DRM_INFO("Analog VGA only\n");
 267         }
 268         return 0;
 269 }
 270
 271 static int ast_get_dram_info(struct drm_device *dev)
 272 {
 273         struct device_node *np = dev->pdev->dev.of_node;
 274         struct ast_private *ast = dev->dev_private;
 275         uint32_t mcr_cfg, mcr_scu_mpll, mcr_scu_strap;
 276         uint32_t denum, num, div, ref_pll, dsel;
 277
 278         switch (ast->config_mode) {
 279         case ast_use_dt:
 280                 /*
 281                  * If some properties are missing, use reasonable
 282                  * defaults for AST2400
 283                  */
 284                 if (of_property_read_u32(np, "aspeed,mcr-configuration",
 285                                          &mcr_cfg))
 286                         mcr_cfg = 0x00000577;
 287                 if (of_property_read_u32(np, "aspeed,mcr-scu-mpll",
 288                                          &mcr_scu_mpll))
 289                         mcr_scu_mpll = 0x000050C0;
 290                 if (of_property_read_u32(np, "aspeed,mcr-scu-strap",
 291                                          &mcr_scu_strap))
 292                         mcr_scu_strap = 0;
 293                 break;
 294         case ast_use_p2a:
 295                 ast_write32(ast, 0xf004, 0x1e6e0000);
 296                 ast_write32(ast, 0xf000, 0x1);
 297                 mcr_cfg = ast_read32(ast, 0x10004);
 298                 mcr_scu_mpll = ast_read32(ast, 0x10120);
 299                 mcr_scu_strap = ast_read32(ast, 0x10170);
 300                 break;
 301         case ast_use_defaults:
 302         default:
 303                 ast->dram_bus_width = 16;
 304                 ast->dram_type = AST_DRAM_1Gx16;
 305                 if (ast->chip == AST2500)
 306                         ast->mclk = 800;
 307                 else
 308                         ast->mclk = 396;
 309                 return 0;
 310         }
 311
 312         if (mcr_cfg & 0x40)
 313                 ast->dram_bus_width = 16;
 314         else
 315                 ast->dram_bus_width = 32;
 316
 317         if (ast->chip == AST2500) {
 318                 switch (mcr_cfg & 0x03) {
 319                 case 0:
 320                         ast->dram_type = AST_DRAM_1Gx16;
 321                         break;
 322                 default:
 323                 case 1:
 324                         ast->dram_type = AST_DRAM_2Gx16;
 325                         break;
 326                 case 2:
 327                         ast->dram_type = AST_DRAM_4Gx16;
 328                         break;
 329                 case 3:
 330                         ast->dram_type = AST_DRAM_8Gx16;
 331                         break;
 332                 }
 333         } else if (ast->chip == AST2300 || ast->chip == AST2400) {
 334                 switch (mcr_cfg & 0x03) {
 335                 case 0:
 336                         ast->dram_type = AST_DRAM_512Mx16;
 337                         break;
 338                 default:
 339                 case 1:
 340                         ast->dram_type = AST_DRAM_1Gx16;
 341                         break;
 342                 case 2:
 343                         ast->dram_type = AST_DRAM_2Gx16;
 344                         break;
 345                 case 3:
 346                         ast->dram_type = AST_DRAM_4Gx16;
 347                         break;
 348                 }
 349         } else {
 350                 switch (mcr_cfg & 0x0c) {
 351                 case 0:
 352                 case 4:
 353                         ast->dram_type = AST_DRAM_512Mx16;
 354                         break;
 355                 case 8:
 356                         if (mcr_cfg & 0x40)
 357                                 ast->dram_type = AST_DRAM_1Gx16;
 358                         else
 359                                 ast->dram_type = AST_DRAM_512Mx32;
 360                         break;
 361                 case 0xc:
 362                         ast->dram_type = AST_DRAM_1Gx32;
 363                         break;
 364                 }
 365         }
 366
 367         if (mcr_scu_strap & 0x2000)
 368                 ref_pll = 14318;
 369         else
 370                 ref_pll = 12000;
 371
 372         denum = mcr_scu_mpll & 0x1f;
 373         num = (mcr_scu_mpll & 0x3fe0) >> 5;
 374         dsel = (mcr_scu_mpll & 0xc000) >> 14;
 375         switch (dsel) {
 376         case 3:
 377                 div = 0x4;
 378                 break;
 379         case 2:
 380         case 1:
 381                 div = 0x2;
 382                 break;
 383         default:
 384                 div = 0x1;
 385                 break;
 386         }
 387         ast->mclk = ref_pll * (num + 2) / ((denum + 2) * (div * 1000));
 388         return 0;
 389 }
 390
 391 enum drm_mode_status ast_mode_config_mode_valid(struct drm_device *dev,
 392                                                 const struct drm_display_mode *mode)
 393 {
 394         static const unsigned long max_bpp = 4; /* DRM_FORMAT_XRGBA8888 */
 395
 396         struct ast_private *ast = dev->dev_private;
 397         unsigned long fbsize, fbpages, max_fbpages;
 398
 399         /* To support double buffering, a framebuffer may not
 400          * consume more than half of the available VRAM.
 401          */
 402         max_fbpages = (ast->vram_size / 2) >> PAGE_SHIFT;
 403
 404         fbsize = mode->hdisplay * mode->vdisplay * max_bpp;
 405         fbpages = DIV_ROUND_UP(fbsize, PAGE_SIZE);
 406
 407         if (fbpages > max_fbpages)
 408                 return MODE_MEM;
 409
 410         return MODE_OK;
 411 }
 412
 413 static const struct drm_mode_config_funcs ast_mode_funcs = {
 414         .fb_create = drm_gem_fb_create,
 415         .mode_valid = ast_mode_config_mode_valid,
 416         .atomic_check = drm_atomic_helper_check,
 417         .atomic_commit = drm_atomic_helper_commit,
 418 };
 419
 420 static u32 ast_get_vram_info(struct drm_device *dev)
 421 {
 422         struct ast_private *ast = dev->dev_private;
 423         u8 jreg;
 424         u32 vram_size;
 425         ast_open_key(ast);
 426
 427         vram_size = AST_VIDMEM_DEFAULT_SIZE;
 428         jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
 429         switch (jreg & 3) {
 430         case 0: vram_size = AST_VIDMEM_SIZE_8M; break;
 431         case 1: vram_size = AST_VIDMEM_SIZE_16M; break;
 432         case 2: vram_size = AST_VIDMEM_SIZE_32M; break;
 433         case 3: vram_size = AST_VIDMEM_SIZE_64M; break;
 434         }
 435
 436         jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff);
 437         switch (jreg & 0x03) {
 438         case 1:
 439                 vram_size -= 0x100000;
 440                 break;
 441         case 2:
 442                 vram_size -= 0x200000;
 443                 break;
 444         case 3:
 445                 vram_size -= 0x400000;
 446                 break;
 447         }
 448
 449         return vram_size;
 450 }
 451
 452 int ast_driver_load(struct drm_device *dev, unsigned long flags)
 453 {
 454         struct ast_private *ast;
 455         bool need_post;
 456         int ret = 0;
 457
 458         ast = kzalloc(sizeof(struct ast_private), GFP_KERNEL);
 459         if (!ast)
 460                 return -ENOMEM;
 461
 462         dev->dev_private = ast;
 463         ast->dev = dev;
 464
 465         ast->regs = pci_iomap(dev->pdev, 1, 0);
 466         if (!ast->regs) {
 467                 ret = -EIO;
 468                 goto out_free;
 469         }
 470
 471         /*
 472          * If we don't have IO space at all, use MMIO now and
 473          * assume the chip has MMIO enabled by default (rev 0x20
 474          * and higher).
 475          */
 476         if (!(pci_resource_flags(dev->pdev, 2) & IORESOURCE_IO)) {
 477                 DRM_INFO("platform has no IO space, trying MMIO\n");
 478                 ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
 479         }
 480
 481         /* "map" IO regs if the above hasn't done so already */
 482         if (!ast->ioregs) {
 483                 ast->ioregs = pci_iomap(dev->pdev, 2, 0);
 484                 if (!ast->ioregs) {
 485                         ret = -EIO;
 486                         goto out_free;
 487                 }
 488         }
 489
 490         ast_detect_chip(dev, &need_post);
 491
 492         if (need_post)
 493                 ast_post_gpu(dev);
 494
 495         if (ast->chip != AST1180) {
 496                 ret = ast_get_dram_info(dev);
 497                 if (ret)
 498                         goto out_free;
 499                 ast->vram_size = ast_get_vram_info(dev);
 500                 DRM_INFO("dram MCLK=%u Mhz type=%d bus_width=%d size=%08x\n",
 501                          ast->mclk, ast->dram_type,
 502                          ast->dram_bus_width, ast->vram_size);
 503         }
 504
 505         ret = ast_mm_init(ast);
 506         if (ret)
 507                 goto out_free;
 508
 509         drm_mode_config_init(dev);
 510
 511         dev->mode_config.funcs = (void *)&ast_mode_funcs;
 512         dev->mode_config.min_width = 0;
 513         dev->mode_config.min_height = 0;
 514         dev->mode_config.preferred_depth = 24;
 515         dev->mode_config.prefer_shadow = 1;
 516         dev->mode_config.fb_base = pci_resource_start(ast->dev->pdev, 0);
 517
 518         if (ast->chip == AST2100 ||
 519             ast->chip == AST2200 ||
 520             ast->chip == AST2300 ||
 521             ast->chip == AST2400 ||
 522             ast->chip == AST2500 ||
 523             ast->chip == AST1180) {
 524                 dev->mode_config.max_width = 1920;
 525                 dev->mode_config.max_height = 2048;
 526         } else {
 527                 dev->mode_config.max_width = 1600;
 528                 dev->mode_config.max_height = 1200;
 529         }
 530
 531         ret = ast_mode_init(dev);
 532         if (ret)
 533                 goto out_free;
 534
 535         drm_mode_config_reset(dev);
 536
 537         ret = drm_fbdev_generic_setup(dev, 32);
 538         if (ret)
 539                 goto out_free;
 540
 541         return 0;
 542 out_free:
 543         kfree(ast);
 544         dev->dev_private = NULL;
 545         return ret;
 546 }
 547
 548 void ast_driver_unload(struct drm_device *dev)
 549 {
 550         struct ast_private *ast = dev->dev_private;
 551
 552         /* enable standard VGA decode */
 553         ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x04);
 554
 555         ast_release_firmware(dev);
 556         kfree(ast->dp501_fw_addr);
 557         ast_mode_fini(dev);
 558         drm_mode_config_cleanup(dev);
 559
 560         ast_mm_fini(ast);
 561         if (ast->ioregs != ast->regs + AST_IO_MM_OFFSET)
 562                 pci_iounmap(dev->pdev, ast->ioregs);
 563         pci_iounmap(dev->pdev, ast->regs);
 564         kfree(ast);
 565 }