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 "amdgpu.h" 30 #include "atom.h" 31 32 #include <linux/slab.h> 33 #include <linux/acpi.h> 34 /* 35 * BIOS. 36 */ 37 38 #define AMD_VBIOS_SIGNATURE " 761295520" 39 #define AMD_VBIOS_SIGNATURE_OFFSET 0x30 40 #define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE) 41 #define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE) 42 #define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA) 43 #define AMD_VBIOS_LENGTH(p) ((p)[2] << 9) 44 45 /* Check if current bios is an ATOM BIOS. 46 * Return true if it is ATOM BIOS. Otherwise, return false. 47 */ 48 static bool check_atom_bios(uint8_t *bios, size_t size) 49 { 50 uint16_t tmp, bios_header_start; 51 52 if (!bios || size < 0x49) { 53 DRM_INFO("vbios mem is null or mem size is wrong\n"); 54 return false; 55 } 56 57 if (!AMD_IS_VALID_VBIOS(bios)) { 58 DRM_INFO("BIOS signature incorrect %x %x\n", bios[0], bios[1]); 59 return false; 60 } 61 62 tmp = bios[0x18] | (bios[0x19] << 8); 63 if (bios[tmp + 0x14] != 0x0) { 64 DRM_INFO("Not an x86 BIOS ROM\n"); 65 return false; 66 } 67 68 bios_header_start = bios[0x48] | (bios[0x49] << 8); 69 if (!bios_header_start) { 70 DRM_INFO("Can't locate bios header\n"); 71 return false; 72 } 73 74 tmp = bios_header_start + 4; 75 if (size < tmp) { 76 DRM_INFO("BIOS header is broken\n"); 77 return false; 78 } 79 80 if (!memcmp(bios + tmp, "ATOM", 4) || 81 !memcmp(bios + tmp, "MOTA", 4)) { 82 DRM_DEBUG("ATOMBIOS detected\n"); 83 return true; 84 } 85 86 return false; 87 } 88 89 static bool is_atom_fw(uint8_t *bios) 90 { 91 uint16_t bios_header_start = bios[0x48] | (bios[0x49] << 8); 92 uint8_t frev = bios[bios_header_start + 2]; 93 uint8_t crev = bios[bios_header_start + 3]; 94 95 if ((frev < 3) || 96 ((frev == 3) && (crev < 3))) 97 return false; 98 99 return true; 100 } 101 102 /* If you boot an IGP board with a discrete card as the primary, 103 * the IGP rom is not accessible via the rom bar as the IGP rom is 104 * part of the system bios. On boot, the system bios puts a 105 * copy of the igp rom at the start of vram if a discrete card is 106 * present. 107 */ 108 static bool igp_read_bios_from_vram(struct amdgpu_device *adev) 109 { 110 uint8_t __iomem *bios; 111 resource_size_t vram_base; 112 resource_size_t size = 256 * 1024; /* ??? */ 113 114 if (!(adev->flags & AMD_IS_APU)) 115 if (amdgpu_need_post(adev)) 116 return false; 117 118 adev->bios = NULL; 119 vram_base = pci_resource_start(adev->pdev, 0); 120 bios = ioremap(vram_base, size); 121 if (!bios) { 122 return false; 123 } 124 125 adev->bios = kmalloc(size, GFP_KERNEL); 126 if (!adev->bios) { 127 iounmap(bios); 128 return false; 129 } 130 adev->bios_size = size; 131 memcpy_fromio(adev->bios, bios, size); 132 iounmap(bios); 133 134 if (!check_atom_bios(adev->bios, size)) { 135 kfree(adev->bios); 136 return false; 137 } 138 139 return true; 140 } 141 142 bool amdgpu_read_bios(struct amdgpu_device *adev) 143 { 144 uint8_t __iomem *bios; 145 size_t size; 146 147 adev->bios = NULL; 148 /* XXX: some cards may return 0 for rom size? ddx has a workaround */ 149 bios = pci_map_rom(adev->pdev, &size); 150 if (!bios) { 151 return false; 152 } 153 154 adev->bios = kzalloc(size, GFP_KERNEL); 155 if (adev->bios == NULL) { 156 pci_unmap_rom(adev->pdev, bios); 157 return false; 158 } 159 adev->bios_size = size; 160 memcpy_fromio(adev->bios, bios, size); 161 pci_unmap_rom(adev->pdev, bios); 162 163 if (!check_atom_bios(adev->bios, size)) { 164 kfree(adev->bios); 165 return false; 166 } 167 168 return true; 169 } 170 171 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev) 172 { 173 u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0}; 174 int len; 175 176 if (!adev->asic_funcs->read_bios_from_rom) 177 return false; 178 179 /* validate VBIOS signature */ 180 if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false) 181 return false; 182 header[AMD_VBIOS_SIGNATURE_END] = 0; 183 184 if ((!AMD_IS_VALID_VBIOS(header)) || 185 0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET], 186 AMD_VBIOS_SIGNATURE, 187 strlen(AMD_VBIOS_SIGNATURE))) 188 return false; 189 190 /* valid vbios, go on */ 191 len = AMD_VBIOS_LENGTH(header); 192 len = ALIGN(len, 4); 193 adev->bios = kmalloc(len, GFP_KERNEL); 194 if (!adev->bios) { 195 DRM_ERROR("no memory to allocate for BIOS\n"); 196 return false; 197 } 198 adev->bios_size = len; 199 200 /* read complete BIOS */ 201 amdgpu_asic_read_bios_from_rom(adev, adev->bios, len); 202 203 if (!check_atom_bios(adev->bios, len)) { 204 kfree(adev->bios); 205 return false; 206 } 207 208 return true; 209 } 210 211 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev) 212 { 213 uint8_t __iomem *bios; 214 size_t size; 215 216 adev->bios = NULL; 217 218 bios = pci_platform_rom(adev->pdev, &size); 219 if (!bios) { 220 return false; 221 } 222 223 adev->bios = kzalloc(size, GFP_KERNEL); 224 if (adev->bios == NULL) 225 return false; 226 227 memcpy_fromio(adev->bios, bios, size); 228 229 if (!check_atom_bios(adev->bios, size)) { 230 kfree(adev->bios); 231 return false; 232 } 233 234 adev->bios_size = size; 235 236 return true; 237 } 238 239 #ifdef CONFIG_ACPI 240 /* ATRM is used to get the BIOS on the discrete cards in 241 * dual-gpu systems. 242 */ 243 /* retrieve the ROM in 4k blocks */ 244 #define ATRM_BIOS_PAGE 4096 245 /** 246 * amdgpu_atrm_call - fetch a chunk of the vbios 247 * 248 * @atrm_handle: acpi ATRM handle 249 * @bios: vbios image pointer 250 * @offset: offset of vbios image data to fetch 251 * @len: length of vbios image data to fetch 252 * 253 * Executes ATRM to fetch a chunk of the discrete 254 * vbios image on PX systems (all asics). 255 * Returns the length of the buffer fetched. 256 */ 257 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios, 258 int offset, int len) 259 { 260 acpi_status status; 261 union acpi_object atrm_arg_elements[2], *obj; 262 struct acpi_object_list atrm_arg; 263 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 264 265 atrm_arg.count = 2; 266 atrm_arg.pointer = &atrm_arg_elements[0]; 267 268 atrm_arg_elements[0].type = ACPI_TYPE_INTEGER; 269 atrm_arg_elements[0].integer.value = offset; 270 271 atrm_arg_elements[1].type = ACPI_TYPE_INTEGER; 272 atrm_arg_elements[1].integer.value = len; 273 274 status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer); 275 if (ACPI_FAILURE(status)) { 276 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status)); 277 return -ENODEV; 278 } 279 280 obj = (union acpi_object *)buffer.pointer; 281 memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length); 282 len = obj->buffer.length; 283 kfree(buffer.pointer); 284 return len; 285 } 286 287 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) 288 { 289 int ret; 290 int size = 256 * 1024; 291 int i; 292 struct pci_dev *pdev = NULL; 293 acpi_handle dhandle, atrm_handle; 294 acpi_status status; 295 bool found = false; 296 297 /* ATRM is for the discrete card only */ 298 if (adev->flags & AMD_IS_APU) 299 return false; 300 301 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 302 dhandle = ACPI_HANDLE(&pdev->dev); 303 if (!dhandle) 304 continue; 305 306 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); 307 if (!ACPI_FAILURE(status)) { 308 found = true; 309 break; 310 } 311 } 312 313 if (!found) { 314 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) { 315 dhandle = ACPI_HANDLE(&pdev->dev); 316 if (!dhandle) 317 continue; 318 319 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); 320 if (!ACPI_FAILURE(status)) { 321 found = true; 322 break; 323 } 324 } 325 } 326 327 if (!found) 328 return false; 329 330 adev->bios = kmalloc(size, GFP_KERNEL); 331 if (!adev->bios) { 332 DRM_ERROR("Unable to allocate bios\n"); 333 return false; 334 } 335 336 for (i = 0; i < size / ATRM_BIOS_PAGE; i++) { 337 ret = amdgpu_atrm_call(atrm_handle, 338 adev->bios, 339 (i * ATRM_BIOS_PAGE), 340 ATRM_BIOS_PAGE); 341 if (ret < ATRM_BIOS_PAGE) 342 break; 343 } 344 345 if (!check_atom_bios(adev->bios, size)) { 346 kfree(adev->bios); 347 return false; 348 } 349 adev->bios_size = size; 350 return true; 351 } 352 #else 353 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) 354 { 355 return false; 356 } 357 #endif 358 359 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev) 360 { 361 if (adev->flags & AMD_IS_APU) 362 return igp_read_bios_from_vram(adev); 363 else 364 return amdgpu_asic_read_disabled_bios(adev); 365 } 366 367 #ifdef CONFIG_ACPI 368 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) 369 { 370 struct acpi_table_header *hdr; 371 acpi_size tbl_size; 372 UEFI_ACPI_VFCT *vfct; 373 unsigned offset; 374 375 if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr))) 376 return false; 377 tbl_size = hdr->length; 378 if (tbl_size < sizeof(UEFI_ACPI_VFCT)) { 379 DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n"); 380 return false; 381 } 382 383 vfct = (UEFI_ACPI_VFCT *)hdr; 384 offset = vfct->VBIOSImageOffset; 385 386 while (offset < tbl_size) { 387 GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset); 388 VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader; 389 390 offset += sizeof(VFCT_IMAGE_HEADER); 391 if (offset > tbl_size) { 392 DRM_ERROR("ACPI VFCT image header truncated\n"); 393 return false; 394 } 395 396 offset += vhdr->ImageLength; 397 if (offset > tbl_size) { 398 DRM_ERROR("ACPI VFCT image truncated\n"); 399 return false; 400 } 401 402 if (vhdr->ImageLength && 403 vhdr->PCIBus == adev->pdev->bus->number && 404 vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) && 405 vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) && 406 vhdr->VendorID == adev->pdev->vendor && 407 vhdr->DeviceID == adev->pdev->device) { 408 adev->bios = kmemdup(&vbios->VbiosContent, 409 vhdr->ImageLength, 410 GFP_KERNEL); 411 412 if (!check_atom_bios(adev->bios, vhdr->ImageLength)) { 413 kfree(adev->bios); 414 return false; 415 } 416 adev->bios_size = vhdr->ImageLength; 417 return true; 418 } 419 } 420 421 DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n"); 422 return false; 423 } 424 #else 425 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) 426 { 427 return false; 428 } 429 #endif 430 431 bool amdgpu_get_bios(struct amdgpu_device *adev) 432 { 433 if (amdgpu_atrm_get_bios(adev)) 434 goto success; 435 436 if (amdgpu_acpi_vfct_bios(adev)) 437 goto success; 438 439 if (igp_read_bios_from_vram(adev)) 440 goto success; 441 442 if (amdgpu_read_bios(adev)) 443 goto success; 444 445 if (amdgpu_read_bios_from_rom(adev)) 446 goto success; 447 448 if (amdgpu_read_disabled_bios(adev)) 449 goto success; 450 451 if (amdgpu_read_platform_bios(adev)) 452 goto success; 453 454 DRM_ERROR("Unable to locate a BIOS ROM\n"); 455 return false; 456 457 success: 458 adev->is_atom_fw = is_atom_fw(adev->bios); 459 return true; 460 } 461