drivers/gpu/drm/radeon/radeon_bios.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Jerome Glisse.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Dave Airlie
  25  *          Alex Deucher
  26  *          Jerome Glisse
  27  */
  28 #include <drm/drmP.h>
  29 #include "radeon_reg.h"
  30 #include "radeon.h"
  31 #include "atom.h"
  32
  33 #include <linux/vga_switcheroo.h>
  34 #include <linux/slab.h>
  35 #include <linux/acpi.h>
  36 /*
  37  * BIOS.
  38  */
  39
  40 /* If you boot an IGP board with a discrete card as the primary,
  41  * the IGP rom is not accessible via the rom bar as the IGP rom is
  42  * part of the system bios.  On boot, the system bios puts a
  43  * copy of the igp rom at the start of vram if a discrete card is
  44  * present.
  45  */
  46 static bool igp_read_bios_from_vram(struct radeon_device *rdev)
  47 {
  48         uint8_t __iomem *bios;
  49         resource_size_t vram_base;
  50         resource_size_t size = 256 * 1024; /* ??? */
  51
  52         if (!(rdev->flags & RADEON_IS_IGP))
  53                 if (!radeon_card_posted(rdev))
  54                         return false;
  55
  56         rdev->bios = NULL;
  57         vram_base = pci_resource_start(rdev->pdev, 0);
  58         bios = ioremap(vram_base, size);
  59         if (!bios) {
  60                 return false;
  61         }
  62
  63         if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
  64                 iounmap(bios);
  65                 return false;
  66         }
  67         rdev->bios = kmalloc(size, GFP_KERNEL);
  68         if (rdev->bios == NULL) {
  69                 iounmap(bios);
  70                 return false;
  71         }
  72         memcpy_fromio(rdev->bios, bios, size);
  73         iounmap(bios);
  74         return true;
  75 }
  76
  77 static bool radeon_read_bios(struct radeon_device *rdev)
  78 {
  79         uint8_t __iomem *bios;
  80         size_t size;
  81
  82         rdev->bios = NULL;
  83         /* XXX: some cards may return 0 for rom size? ddx has a workaround */
  84         bios = pci_map_rom(rdev->pdev, &size);
  85         if (!bios) {
  86                 return false;
  87         }
  88
  89         if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
  90                 pci_unmap_rom(rdev->pdev, bios);
  91                 return false;
  92         }
  93         rdev->bios = kmemdup(bios, size, GFP_KERNEL);
  94         if (rdev->bios == NULL) {
  95                 pci_unmap_rom(rdev->pdev, bios);
  96                 return false;
  97         }
  98         pci_unmap_rom(rdev->pdev, bios);
  99         return true;
 100 }
 101
 102 static bool radeon_read_platform_bios(struct radeon_device *rdev)
 103 {
 104         uint8_t __iomem *bios;
 105         size_t size;
 106
 107         rdev->bios = NULL;
 108
 109         bios = pci_platform_rom(rdev->pdev, &size);
 110         if (!bios) {
 111                 return false;
 112         }
 113
 114         if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
 115                 return false;
 116         }
 117         rdev->bios = kmemdup(bios, size, GFP_KERNEL);
 118         if (rdev->bios == NULL) {
 119                 return false;
 120         }
 121
 122         return true;
 123 }
 124
 125 #ifdef CONFIG_ACPI
 126 /* ATRM is used to get the BIOS on the discrete cards in
 127  * dual-gpu systems.
 128  */
 129 /* retrieve the ROM in 4k blocks */
 130 #define ATRM_BIOS_PAGE 4096
 131 /**
 132  * radeon_atrm_call - fetch a chunk of the vbios
 133  *
 134  * @atrm_handle: acpi ATRM handle
 135  * @bios: vbios image pointer
 136  * @offset: offset of vbios image data to fetch
 137  * @len: length of vbios image data to fetch
 138  *
 139  * Executes ATRM to fetch a chunk of the discrete
 140  * vbios image on PX systems (all asics).
 141  * Returns the length of the buffer fetched.
 142  */
 143 static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
 144                             int offset, int len)
 145 {
 146         acpi_status status;
 147         union acpi_object atrm_arg_elements[2], *obj;
 148         struct acpi_object_list atrm_arg;
 149         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 150
 151         atrm_arg.count = 2;
 152         atrm_arg.pointer = &atrm_arg_elements[0];
 153
 154         atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
 155         atrm_arg_elements[0].integer.value = offset;
 156
 157         atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
 158         atrm_arg_elements[1].integer.value = len;
 159
 160         status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
 161         if (ACPI_FAILURE(status)) {
 162                 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
 163                 return -ENODEV;
 164         }
 165
 166         obj = (union acpi_object *)buffer.pointer;
 167         memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
 168         len = obj->buffer.length;
 169         kfree(buffer.pointer);
 170         return len;
 171 }
 172
 173 static bool radeon_atrm_get_bios(struct radeon_device *rdev)
 174 {
 175         int ret;
 176         int size = 256 * 1024;
 177         int i;
 178         struct pci_dev *pdev = NULL;
 179         acpi_handle dhandle, atrm_handle;
 180         acpi_status status;
 181         bool found = false;
 182
 183         /* ATRM is for the discrete card only */
 184         if (rdev->flags & RADEON_IS_IGP)
 185                 return false;
 186
 187         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 188                 dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 189                 if (!dhandle)
 190                         continue;
 191
 192                 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
 193                 if (!ACPI_FAILURE(status)) {
 194                         found = true;
 195                         break;
 196                 }
 197         }
 198
 199         if (!found) {
 200                 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
 201                         dhandle = ACPI_HANDLE(&pdev->dev);
 202                         if (!dhandle)
 203                                 continue;
 204
 205                         status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
 206                         if (!ACPI_FAILURE(status)) {
 207                                 found = true;
 208                                 break;
 209                         }
 210                 }
 211         }
 212
 213         if (!found)
 214                 return false;
 215
 216         rdev->bios = kmalloc(size, GFP_KERNEL);
 217         if (!rdev->bios) {
 218                 DRM_ERROR("Unable to allocate bios\n");
 219                 return false;
 220         }
 221
 222         for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
 223                 ret = radeon_atrm_call(atrm_handle,
 224                                        rdev->bios,
 225                                        (i * ATRM_BIOS_PAGE),
 226                                        ATRM_BIOS_PAGE);
 227                 if (ret < ATRM_BIOS_PAGE)
 228                         break;
 229         }
 230
 231         if (i == 0 || rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
 232                 kfree(rdev->bios);
 233                 return false;
 234         }
 235         return true;
 236 }
 237 #else
 238 static inline bool radeon_atrm_get_bios(struct radeon_device *rdev)
 239 {
 240         return false;
 241 }
 242 #endif
 243
 244 static bool ni_read_disabled_bios(struct radeon_device *rdev)
 245 {
 246         u32 bus_cntl;
 247         u32 d1vga_control;
 248         u32 d2vga_control;
 249         u32 vga_render_control;
 250         u32 rom_cntl;
 251         bool r;
 252
 253         bus_cntl = RREG32(R600_BUS_CNTL);
 254         d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
 255         d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
 256         vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
 257         rom_cntl = RREG32(R600_ROM_CNTL);
 258
 259         /* enable the rom */
 260         WREG32(R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
 261         if (!ASIC_IS_NODCE(rdev)) {
 262                 /* Disable VGA mode */
 263                 WREG32(AVIVO_D1VGA_CONTROL,
 264                        (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
 265                                           AVIVO_DVGA_CONTROL_TIMING_SELECT)));
 266                 WREG32(AVIVO_D2VGA_CONTROL,
 267                        (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
 268                                           AVIVO_DVGA_CONTROL_TIMING_SELECT)));
 269                 WREG32(AVIVO_VGA_RENDER_CONTROL,
 270                        (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
 271         }
 272         WREG32(R600_ROM_CNTL, rom_cntl | R600_SCK_OVERWRITE);
 273
 274         r = radeon_read_bios(rdev);
 275
 276         /* restore regs */
 277         WREG32(R600_BUS_CNTL, bus_cntl);
 278         if (!ASIC_IS_NODCE(rdev)) {
 279                 WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
 280                 WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
 281                 WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
 282         }
 283         WREG32(R600_ROM_CNTL, rom_cntl);
 284         return r;
 285 }
 286
 287 static bool r700_read_disabled_bios(struct radeon_device *rdev)
 288 {
 289         uint32_t viph_control;
 290         uint32_t bus_cntl;
 291         uint32_t d1vga_control;
 292         uint32_t d2vga_control;
 293         uint32_t vga_render_control;
 294         uint32_t rom_cntl;
 295         uint32_t cg_spll_func_cntl = 0;
 296         uint32_t cg_spll_status;
 297         bool r;
 298
 299         viph_control = RREG32(RADEON_VIPH_CONTROL);
 300         bus_cntl = RREG32(R600_BUS_CNTL);
 301         d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
 302         d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
 303         vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
 304         rom_cntl = RREG32(R600_ROM_CNTL);
 305
 306         /* disable VIP */
 307         WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
 308         /* enable the rom */
 309         WREG32(R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
 310         /* Disable VGA mode */
 311         WREG32(AVIVO_D1VGA_CONTROL,
 312                (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
 313                 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
 314         WREG32(AVIVO_D2VGA_CONTROL,
 315                (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
 316                 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
 317         WREG32(AVIVO_VGA_RENDER_CONTROL,
 318                (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
 319
 320         if (rdev->family == CHIP_RV730) {
 321                 cg_spll_func_cntl = RREG32(R600_CG_SPLL_FUNC_CNTL);
 322
 323                 /* enable bypass mode */
 324                 WREG32(R600_CG_SPLL_FUNC_CNTL, (cg_spll_func_cntl |
 325                                                 R600_SPLL_BYPASS_EN));
 326
 327                 /* wait for SPLL_CHG_STATUS to change to 1 */
 328                 cg_spll_status = 0;
 329                 while (!(cg_spll_status & R600_SPLL_CHG_STATUS))
 330                         cg_spll_status = RREG32(R600_CG_SPLL_STATUS);
 331
 332                 WREG32(R600_ROM_CNTL, (rom_cntl & ~R600_SCK_OVERWRITE));
 333         } else
 334                 WREG32(R600_ROM_CNTL, (rom_cntl | R600_SCK_OVERWRITE));
 335
 336         r = radeon_read_bios(rdev);
 337
 338         /* restore regs */
 339         if (rdev->family == CHIP_RV730) {
 340                 WREG32(R600_CG_SPLL_FUNC_CNTL, cg_spll_func_cntl);
 341
 342                 /* wait for SPLL_CHG_STATUS to change to 1 */
 343                 cg_spll_status = 0;
 344                 while (!(cg_spll_status & R600_SPLL_CHG_STATUS))
 345                         cg_spll_status = RREG32(R600_CG_SPLL_STATUS);
 346         }
 347         WREG32(RADEON_VIPH_CONTROL, viph_control);
 348         WREG32(R600_BUS_CNTL, bus_cntl);
 349         WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
 350         WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
 351         WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
 352         WREG32(R600_ROM_CNTL, rom_cntl);
 353         return r;
 354 }
 355
 356 static bool r600_read_disabled_bios(struct radeon_device *rdev)
 357 {
 358         uint32_t viph_control;
 359         uint32_t bus_cntl;
 360         uint32_t d1vga_control;
 361         uint32_t d2vga_control;
 362         uint32_t vga_render_control;
 363         uint32_t rom_cntl;
 364         uint32_t general_pwrmgt;
 365         uint32_t low_vid_lower_gpio_cntl;
 366         uint32_t medium_vid_lower_gpio_cntl;
 367         uint32_t high_vid_lower_gpio_cntl;
 368         uint32_t ctxsw_vid_lower_gpio_cntl;
 369         uint32_t lower_gpio_enable;
 370         bool r;
 371
 372         viph_control = RREG32(RADEON_VIPH_CONTROL);
 373         bus_cntl = RREG32(R600_BUS_CNTL);
 374         d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
 375         d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
 376         vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
 377         rom_cntl = RREG32(R600_ROM_CNTL);
 378         general_pwrmgt = RREG32(R600_GENERAL_PWRMGT);
 379         low_vid_lower_gpio_cntl = RREG32(R600_LOW_VID_LOWER_GPIO_CNTL);
 380         medium_vid_lower_gpio_cntl = RREG32(R600_MEDIUM_VID_LOWER_GPIO_CNTL);
 381         high_vid_lower_gpio_cntl = RREG32(R600_HIGH_VID_LOWER_GPIO_CNTL);
 382         ctxsw_vid_lower_gpio_cntl = RREG32(R600_CTXSW_VID_LOWER_GPIO_CNTL);
 383         lower_gpio_enable = RREG32(R600_LOWER_GPIO_ENABLE);
 384
 385         /* disable VIP */
 386         WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
 387         /* enable the rom */
 388         WREG32(R600_BUS_CNTL, (bus_cntl & ~R600_BIOS_ROM_DIS));
 389         /* Disable VGA mode */
 390         WREG32(AVIVO_D1VGA_CONTROL,
 391                (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
 392                 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
 393         WREG32(AVIVO_D2VGA_CONTROL,
 394                (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
 395                 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
 396         WREG32(AVIVO_VGA_RENDER_CONTROL,
 397                (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
 398
 399         WREG32(R600_ROM_CNTL,
 400                ((rom_cntl & ~R600_SCK_PRESCALE_CRYSTAL_CLK_MASK) |
 401                 (1 << R600_SCK_PRESCALE_CRYSTAL_CLK_SHIFT) |
 402                 R600_SCK_OVERWRITE));
 403
 404         WREG32(R600_GENERAL_PWRMGT, (general_pwrmgt & ~R600_OPEN_DRAIN_PADS));
 405         WREG32(R600_LOW_VID_LOWER_GPIO_CNTL,
 406                (low_vid_lower_gpio_cntl & ~0x400));
 407         WREG32(R600_MEDIUM_VID_LOWER_GPIO_CNTL,
 408                (medium_vid_lower_gpio_cntl & ~0x400));
 409         WREG32(R600_HIGH_VID_LOWER_GPIO_CNTL,
 410                (high_vid_lower_gpio_cntl & ~0x400));
 411         WREG32(R600_CTXSW_VID_LOWER_GPIO_CNTL,
 412                (ctxsw_vid_lower_gpio_cntl & ~0x400));
 413         WREG32(R600_LOWER_GPIO_ENABLE, (lower_gpio_enable | 0x400));
 414
 415         r = radeon_read_bios(rdev);
 416
 417         /* restore regs */
 418         WREG32(RADEON_VIPH_CONTROL, viph_control);
 419         WREG32(R600_BUS_CNTL, bus_cntl);
 420         WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
 421         WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
 422         WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
 423         WREG32(R600_ROM_CNTL, rom_cntl);
 424         WREG32(R600_GENERAL_PWRMGT, general_pwrmgt);
 425         WREG32(R600_LOW_VID_LOWER_GPIO_CNTL, low_vid_lower_gpio_cntl);
 426         WREG32(R600_MEDIUM_VID_LOWER_GPIO_CNTL, medium_vid_lower_gpio_cntl);
 427         WREG32(R600_HIGH_VID_LOWER_GPIO_CNTL, high_vid_lower_gpio_cntl);
 428         WREG32(R600_CTXSW_VID_LOWER_GPIO_CNTL, ctxsw_vid_lower_gpio_cntl);
 429         WREG32(R600_LOWER_GPIO_ENABLE, lower_gpio_enable);
 430         return r;
 431 }
 432
 433 static bool avivo_read_disabled_bios(struct radeon_device *rdev)
 434 {
 435         uint32_t seprom_cntl1;
 436         uint32_t viph_control;
 437         uint32_t bus_cntl;
 438         uint32_t d1vga_control;
 439         uint32_t d2vga_control;
 440         uint32_t vga_render_control;
 441         uint32_t gpiopad_a;
 442         uint32_t gpiopad_en;
 443         uint32_t gpiopad_mask;
 444         bool r;
 445
 446         seprom_cntl1 = RREG32(RADEON_SEPROM_CNTL1);
 447         viph_control = RREG32(RADEON_VIPH_CONTROL);
 448         bus_cntl = RREG32(RV370_BUS_CNTL);
 449         d1vga_control = RREG32(AVIVO_D1VGA_CONTROL);
 450         d2vga_control = RREG32(AVIVO_D2VGA_CONTROL);
 451         vga_render_control = RREG32(AVIVO_VGA_RENDER_CONTROL);
 452         gpiopad_a = RREG32(RADEON_GPIOPAD_A);
 453         gpiopad_en = RREG32(RADEON_GPIOPAD_EN);
 454         gpiopad_mask = RREG32(RADEON_GPIOPAD_MASK);
 455
 456         WREG32(RADEON_SEPROM_CNTL1,
 457                ((seprom_cntl1 & ~RADEON_SCK_PRESCALE_MASK) |
 458                 (0xc << RADEON_SCK_PRESCALE_SHIFT)));
 459         WREG32(RADEON_GPIOPAD_A, 0);
 460         WREG32(RADEON_GPIOPAD_EN, 0);
 461         WREG32(RADEON_GPIOPAD_MASK, 0);
 462
 463         /* disable VIP */
 464         WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
 465
 466         /* enable the rom */
 467         WREG32(RV370_BUS_CNTL, (bus_cntl & ~RV370_BUS_BIOS_DIS_ROM));
 468
 469         /* Disable VGA mode */
 470         WREG32(AVIVO_D1VGA_CONTROL,
 471                (d1vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
 472                 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
 473         WREG32(AVIVO_D2VGA_CONTROL,
 474                (d2vga_control & ~(AVIVO_DVGA_CONTROL_MODE_ENABLE |
 475                 AVIVO_DVGA_CONTROL_TIMING_SELECT)));
 476         WREG32(AVIVO_VGA_RENDER_CONTROL,
 477                (vga_render_control & ~AVIVO_VGA_VSTATUS_CNTL_MASK));
 478
 479         r = radeon_read_bios(rdev);
 480
 481         /* restore regs */
 482         WREG32(RADEON_SEPROM_CNTL1, seprom_cntl1);
 483         WREG32(RADEON_VIPH_CONTROL, viph_control);
 484         WREG32(RV370_BUS_CNTL, bus_cntl);
 485         WREG32(AVIVO_D1VGA_CONTROL, d1vga_control);
 486         WREG32(AVIVO_D2VGA_CONTROL, d2vga_control);
 487         WREG32(AVIVO_VGA_RENDER_CONTROL, vga_render_control);
 488         WREG32(RADEON_GPIOPAD_A, gpiopad_a);
 489         WREG32(RADEON_GPIOPAD_EN, gpiopad_en);
 490         WREG32(RADEON_GPIOPAD_MASK, gpiopad_mask);
 491         return r;
 492 }
 493
 494 static bool legacy_read_disabled_bios(struct radeon_device *rdev)
 495 {
 496         uint32_t seprom_cntl1;
 497         uint32_t viph_control;
 498         uint32_t bus_cntl;
 499         uint32_t crtc_gen_cntl;
 500         uint32_t crtc2_gen_cntl;
 501         uint32_t crtc_ext_cntl;
 502         uint32_t fp2_gen_cntl;
 503         bool r;
 504
 505         seprom_cntl1 = RREG32(RADEON_SEPROM_CNTL1);
 506         viph_control = RREG32(RADEON_VIPH_CONTROL);
 507         if (rdev->flags & RADEON_IS_PCIE)
 508                 bus_cntl = RREG32(RV370_BUS_CNTL);
 509         else
 510                 bus_cntl = RREG32(RADEON_BUS_CNTL);
 511         crtc_gen_cntl = RREG32(RADEON_CRTC_GEN_CNTL);
 512         crtc2_gen_cntl = 0;
 513         crtc_ext_cntl = RREG32(RADEON_CRTC_EXT_CNTL);
 514         fp2_gen_cntl = 0;
 515
 516         if (rdev->ddev->pci_device == PCI_DEVICE_ID_ATI_RADEON_QY) {
 517                 fp2_gen_cntl = RREG32(RADEON_FP2_GEN_CNTL);
 518         }
 519
 520         if (!(rdev->flags & RADEON_SINGLE_CRTC)) {
 521                 crtc2_gen_cntl = RREG32(RADEON_CRTC2_GEN_CNTL);
 522         }
 523
 524         WREG32(RADEON_SEPROM_CNTL1,
 525                ((seprom_cntl1 & ~RADEON_SCK_PRESCALE_MASK) |
 526                 (0xc << RADEON_SCK_PRESCALE_SHIFT)));
 527
 528         /* disable VIP */
 529         WREG32(RADEON_VIPH_CONTROL, (viph_control & ~RADEON_VIPH_EN));
 530
 531         /* enable the rom */
 532         if (rdev->flags & RADEON_IS_PCIE)
 533                 WREG32(RV370_BUS_CNTL, (bus_cntl & ~RV370_BUS_BIOS_DIS_ROM));
 534         else
 535                 WREG32(RADEON_BUS_CNTL, (bus_cntl & ~RADEON_BUS_BIOS_DIS_ROM));
 536
 537         /* Turn off mem requests and CRTC for both controllers */
 538         WREG32(RADEON_CRTC_GEN_CNTL,
 539                ((crtc_gen_cntl & ~RADEON_CRTC_EN) |
 540                 (RADEON_CRTC_DISP_REQ_EN_B |
 541                  RADEON_CRTC_EXT_DISP_EN)));
 542         if (!(rdev->flags & RADEON_SINGLE_CRTC)) {
 543                 WREG32(RADEON_CRTC2_GEN_CNTL,
 544                        ((crtc2_gen_cntl & ~RADEON_CRTC2_EN) |
 545                         RADEON_CRTC2_DISP_REQ_EN_B));
 546         }
 547         /* Turn off CRTC */
 548         WREG32(RADEON_CRTC_EXT_CNTL,
 549                ((crtc_ext_cntl & ~RADEON_CRTC_CRT_ON) |
 550                 (RADEON_CRTC_SYNC_TRISTAT |
 551                  RADEON_CRTC_DISPLAY_DIS)));
 552
 553         if (rdev->ddev->pci_device == PCI_DEVICE_ID_ATI_RADEON_QY) {
 554                 WREG32(RADEON_FP2_GEN_CNTL, (fp2_gen_cntl & ~RADEON_FP2_ON));
 555         }
 556
 557         r = radeon_read_bios(rdev);
 558
 559         /* restore regs */
 560         WREG32(RADEON_SEPROM_CNTL1, seprom_cntl1);
 561         WREG32(RADEON_VIPH_CONTROL, viph_control);
 562         if (rdev->flags & RADEON_IS_PCIE)
 563                 WREG32(RV370_BUS_CNTL, bus_cntl);
 564         else
 565                 WREG32(RADEON_BUS_CNTL, bus_cntl);
 566         WREG32(RADEON_CRTC_GEN_CNTL, crtc_gen_cntl);
 567         if (!(rdev->flags & RADEON_SINGLE_CRTC)) {
 568                 WREG32(RADEON_CRTC2_GEN_CNTL, crtc2_gen_cntl);
 569         }
 570         WREG32(RADEON_CRTC_EXT_CNTL, crtc_ext_cntl);
 571         if (rdev->ddev->pci_device == PCI_DEVICE_ID_ATI_RADEON_QY) {
 572                 WREG32(RADEON_FP2_GEN_CNTL, fp2_gen_cntl);
 573         }
 574         return r;
 575 }
 576
 577 static bool radeon_read_disabled_bios(struct radeon_device *rdev)
 578 {
 579         if (rdev->flags & RADEON_IS_IGP)
 580                 return igp_read_bios_from_vram(rdev);
 581         else if (rdev->family >= CHIP_BARTS)
 582                 return ni_read_disabled_bios(rdev);
 583         else if (rdev->family >= CHIP_RV770)
 584                 return r700_read_disabled_bios(rdev);
 585         else if (rdev->family >= CHIP_R600)
 586                 return r600_read_disabled_bios(rdev);
 587         else if (rdev->family >= CHIP_RS600)
 588                 return avivo_read_disabled_bios(rdev);
 589         else
 590                 return legacy_read_disabled_bios(rdev);
 591 }
 592
 593 #ifdef CONFIG_ACPI
 594 static bool radeon_acpi_vfct_bios(struct radeon_device *rdev)
 595 {
 596         bool ret = false;
 597         struct acpi_table_header *hdr;
 598         acpi_size tbl_size;
 599         UEFI_ACPI_VFCT *vfct;
 600         GOP_VBIOS_CONTENT *vbios;
 601         VFCT_IMAGE_HEADER *vhdr;
 602
 603         if (!ACPI_SUCCESS(acpi_get_table_with_size("VFCT", 1, &hdr, &tbl_size)))
 604                 return false;
 605         if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
 606                 DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n");
 607                 goto out_unmap;
 608         }
 609
 610         vfct = (UEFI_ACPI_VFCT *)hdr;
 611         if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) > tbl_size) {
 612                 DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n");
 613                 goto out_unmap;
 614         }
 615
 616         vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + vfct->VBIOSImageOffset);
 617         vhdr = &vbios->VbiosHeader;
 618         DRM_INFO("ACPI VFCT contains a BIOS for %02x:%02x.%d %04x:%04x, size %d\n",
 619                         vhdr->PCIBus, vhdr->PCIDevice, vhdr->PCIFunction,
 620                         vhdr->VendorID, vhdr->DeviceID, vhdr->ImageLength);
 621
 622         if (vhdr->PCIBus != rdev->pdev->bus->number ||
 623             vhdr->PCIDevice != PCI_SLOT(rdev->pdev->devfn) ||
 624             vhdr->PCIFunction != PCI_FUNC(rdev->pdev->devfn) ||
 625             vhdr->VendorID != rdev->pdev->vendor ||
 626             vhdr->DeviceID != rdev->pdev->device) {
 627                 DRM_INFO("ACPI VFCT table is not for this card\n");
 628                 goto out_unmap;
 629         };
 630
 631         if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) + vhdr->ImageLength > tbl_size) {
 632                 DRM_ERROR("ACPI VFCT image truncated\n");
 633                 goto out_unmap;
 634         }
 635
 636         rdev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL);
 637         ret = !!rdev->bios;
 638
 639 out_unmap:
 640         return ret;
 641 }
 642 #else
 643 static inline bool radeon_acpi_vfct_bios(struct radeon_device *rdev)
 644 {
 645         return false;
 646 }
 647 #endif
 648
 649 bool radeon_get_bios(struct radeon_device *rdev)
 650 {
 651         bool r;
 652         uint16_t tmp;
 653
 654         r = radeon_atrm_get_bios(rdev);
 655         if (r == false)
 656                 r = radeon_acpi_vfct_bios(rdev);
 657         if (r == false)
 658                 r = igp_read_bios_from_vram(rdev);
 659         if (r == false)
 660                 r = radeon_read_bios(rdev);
 661         if (r == false) {
 662                 r = radeon_read_disabled_bios(rdev);
 663         }
 664         if (r == false) {
 665                 r = radeon_read_platform_bios(rdev);
 666         }
 667         if (r == false || rdev->bios == NULL) {
 668                 DRM_ERROR("Unable to locate a BIOS ROM\n");
 669                 rdev->bios = NULL;
 670                 return false;
 671         }
 672         if (rdev->bios[0] != 0x55 || rdev->bios[1] != 0xaa) {
 673                 printk("BIOS signature incorrect %x %x\n", rdev->bios[0], rdev->bios[1]);
 674                 goto free_bios;
 675         }
 676
 677         tmp = RBIOS16(0x18);
 678         if (RBIOS8(tmp + 0x14) != 0x0) {
 679                 DRM_INFO("Not an x86 BIOS ROM, not using.\n");
 680                 goto free_bios;
 681         }
 682
 683         rdev->bios_header_start = RBIOS16(0x48);
 684         if (!rdev->bios_header_start) {
 685                 goto free_bios;
 686         }
 687         tmp = rdev->bios_header_start + 4;
 688         if (!memcmp(rdev->bios + tmp, "ATOM", 4) ||
 689             !memcmp(rdev->bios + tmp, "MOTA", 4)) {
 690                 rdev->is_atom_bios = true;
 691         } else {
 692                 rdev->is_atom_bios = false;
 693         }
 694
 695         DRM_DEBUG("%sBIOS detected\n", rdev->is_atom_bios ? "ATOM" : "COM");
 696         return true;
 697 free_bios:
 698         kfree(rdev->bios);
 699         rdev->bios = NULL;
 700         return false;
 701 }