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 bios_header_start = bios[0x48] | (bios[0x49] << 8); 63 if (!bios_header_start) { 64 DRM_INFO("Can't locate bios header\n"); 65 return false; 66 } 67 68 tmp = bios_header_start + 4; 69 if (size < tmp) { 70 DRM_INFO("BIOS header is broken\n"); 71 return false; 72 } 73 74 if (!memcmp(bios + tmp, "ATOM", 4) || 75 !memcmp(bios + tmp, "MOTA", 4)) { 76 DRM_DEBUG("ATOMBIOS detected\n"); 77 return true; 78 } 79 80 return false; 81 } 82 83 /* If you boot an IGP board with a discrete card as the primary, 84 * the IGP rom is not accessible via the rom bar as the IGP rom is 85 * part of the system bios. On boot, the system bios puts a 86 * copy of the igp rom at the start of vram if a discrete card is 87 * present. 88 */ 89 static bool igp_read_bios_from_vram(struct amdgpu_device *adev) 90 { 91 uint8_t __iomem *bios; 92 resource_size_t vram_base; 93 resource_size_t size = 256 * 1024; /* ??? */ 94 95 if (!(adev->flags & AMD_IS_APU)) 96 if (amdgpu_device_need_post(adev)) 97 return false; 98 99 adev->bios = NULL; 100 vram_base = pci_resource_start(adev->pdev, 0); 101 bios = ioremap_wc(vram_base, size); 102 if (!bios) { 103 return false; 104 } 105 106 adev->bios = kmalloc(size, GFP_KERNEL); 107 if (!adev->bios) { 108 iounmap(bios); 109 return false; 110 } 111 adev->bios_size = size; 112 memcpy_fromio(adev->bios, bios, size); 113 iounmap(bios); 114 115 if (!check_atom_bios(adev->bios, size)) { 116 kfree(adev->bios); 117 return false; 118 } 119 120 return true; 121 } 122 123 bool amdgpu_read_bios(struct amdgpu_device *adev) 124 { 125 uint8_t __iomem *bios; 126 size_t size; 127 128 adev->bios = NULL; 129 /* XXX: some cards may return 0 for rom size? ddx has a workaround */ 130 bios = pci_map_rom(adev->pdev, &size); 131 if (!bios) { 132 return false; 133 } 134 135 adev->bios = kzalloc(size, GFP_KERNEL); 136 if (adev->bios == NULL) { 137 pci_unmap_rom(adev->pdev, bios); 138 return false; 139 } 140 adev->bios_size = size; 141 memcpy_fromio(adev->bios, bios, size); 142 pci_unmap_rom(adev->pdev, bios); 143 144 if (!check_atom_bios(adev->bios, size)) { 145 kfree(adev->bios); 146 return false; 147 } 148 149 return true; 150 } 151 152 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev) 153 { 154 u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0}; 155 int len; 156 157 if (!adev->asic_funcs->read_bios_from_rom) 158 return false; 159 160 /* validate VBIOS signature */ 161 if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false) 162 return false; 163 header[AMD_VBIOS_SIGNATURE_END] = 0; 164 165 if ((!AMD_IS_VALID_VBIOS(header)) || 166 0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET], 167 AMD_VBIOS_SIGNATURE, 168 strlen(AMD_VBIOS_SIGNATURE))) 169 return false; 170 171 /* valid vbios, go on */ 172 len = AMD_VBIOS_LENGTH(header); 173 len = ALIGN(len, 4); 174 adev->bios = kmalloc(len, GFP_KERNEL); 175 if (!adev->bios) { 176 DRM_ERROR("no memory to allocate for BIOS\n"); 177 return false; 178 } 179 adev->bios_size = len; 180 181 /* read complete BIOS */ 182 amdgpu_asic_read_bios_from_rom(adev, adev->bios, len); 183 184 if (!check_atom_bios(adev->bios, len)) { 185 kfree(adev->bios); 186 return false; 187 } 188 189 return true; 190 } 191 192 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev) 193 { 194 phys_addr_t rom = adev->pdev->rom; 195 size_t romlen = adev->pdev->romlen; 196 void __iomem *bios; 197 198 adev->bios = NULL; 199 200 if (!rom || romlen == 0) 201 return false; 202 203 adev->bios = kzalloc(romlen, GFP_KERNEL); 204 if (!adev->bios) 205 return false; 206 207 bios = ioremap(rom, romlen); 208 if (!bios) 209 goto free_bios; 210 211 memcpy_fromio(adev->bios, bios, romlen); 212 iounmap(bios); 213 214 if (!check_atom_bios(adev->bios, romlen)) 215 goto free_bios; 216 217 adev->bios_size = romlen; 218 219 return true; 220 free_bios: 221 kfree(adev->bios); 222 return false; 223 } 224 225 #ifdef CONFIG_ACPI 226 /* ATRM is used to get the BIOS on the discrete cards in 227 * dual-gpu systems. 228 */ 229 /* retrieve the ROM in 4k blocks */ 230 #define ATRM_BIOS_PAGE 4096 231 /** 232 * amdgpu_atrm_call - fetch a chunk of the vbios 233 * 234 * @atrm_handle: acpi ATRM handle 235 * @bios: vbios image pointer 236 * @offset: offset of vbios image data to fetch 237 * @len: length of vbios image data to fetch 238 * 239 * Executes ATRM to fetch a chunk of the discrete 240 * vbios image on PX systems (all asics). 241 * Returns the length of the buffer fetched. 242 */ 243 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios, 244 int offset, int len) 245 { 246 acpi_status status; 247 union acpi_object atrm_arg_elements[2], *obj; 248 struct acpi_object_list atrm_arg; 249 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 250 251 atrm_arg.count = 2; 252 atrm_arg.pointer = &atrm_arg_elements[0]; 253 254 atrm_arg_elements[0].type = ACPI_TYPE_INTEGER; 255 atrm_arg_elements[0].integer.value = offset; 256 257 atrm_arg_elements[1].type = ACPI_TYPE_INTEGER; 258 atrm_arg_elements[1].integer.value = len; 259 260 status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer); 261 if (ACPI_FAILURE(status)) { 262 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status)); 263 return -ENODEV; 264 } 265 266 obj = (union acpi_object *)buffer.pointer; 267 memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length); 268 len = obj->buffer.length; 269 kfree(buffer.pointer); 270 return len; 271 } 272 273 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) 274 { 275 int ret; 276 int size = 256 * 1024; 277 int i; 278 struct pci_dev *pdev = NULL; 279 acpi_handle dhandle, atrm_handle; 280 acpi_status status; 281 bool found = false; 282 283 /* ATRM is for the discrete card only */ 284 if (adev->flags & AMD_IS_APU) 285 return false; 286 287 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 288 dhandle = ACPI_HANDLE(&pdev->dev); 289 if (!dhandle) 290 continue; 291 292 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); 293 if (!ACPI_FAILURE(status)) { 294 found = true; 295 break; 296 } 297 } 298 299 if (!found) { 300 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) { 301 dhandle = ACPI_HANDLE(&pdev->dev); 302 if (!dhandle) 303 continue; 304 305 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); 306 if (!ACPI_FAILURE(status)) { 307 found = true; 308 break; 309 } 310 } 311 } 312 313 if (!found) 314 return false; 315 316 adev->bios = kmalloc(size, GFP_KERNEL); 317 if (!adev->bios) { 318 DRM_ERROR("Unable to allocate bios\n"); 319 return false; 320 } 321 322 for (i = 0; i < size / ATRM_BIOS_PAGE; i++) { 323 ret = amdgpu_atrm_call(atrm_handle, 324 adev->bios, 325 (i * ATRM_BIOS_PAGE), 326 ATRM_BIOS_PAGE); 327 if (ret < ATRM_BIOS_PAGE) 328 break; 329 } 330 331 if (!check_atom_bios(adev->bios, size)) { 332 kfree(adev->bios); 333 return false; 334 } 335 adev->bios_size = size; 336 return true; 337 } 338 #else 339 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) 340 { 341 return false; 342 } 343 #endif 344 345 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev) 346 { 347 if (adev->flags & AMD_IS_APU) 348 return igp_read_bios_from_vram(adev); 349 else 350 return amdgpu_asic_read_disabled_bios(adev); 351 } 352 353 #ifdef CONFIG_ACPI 354 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) 355 { 356 struct acpi_table_header *hdr; 357 acpi_size tbl_size; 358 UEFI_ACPI_VFCT *vfct; 359 unsigned offset; 360 361 if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr))) 362 return false; 363 tbl_size = hdr->length; 364 if (tbl_size < sizeof(UEFI_ACPI_VFCT)) { 365 DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n"); 366 return false; 367 } 368 369 vfct = (UEFI_ACPI_VFCT *)hdr; 370 offset = vfct->VBIOSImageOffset; 371 372 while (offset < tbl_size) { 373 GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset); 374 VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader; 375 376 offset += sizeof(VFCT_IMAGE_HEADER); 377 if (offset > tbl_size) { 378 DRM_ERROR("ACPI VFCT image header truncated\n"); 379 return false; 380 } 381 382 offset += vhdr->ImageLength; 383 if (offset > tbl_size) { 384 DRM_ERROR("ACPI VFCT image truncated\n"); 385 return false; 386 } 387 388 if (vhdr->ImageLength && 389 vhdr->PCIBus == adev->pdev->bus->number && 390 vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) && 391 vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) && 392 vhdr->VendorID == adev->pdev->vendor && 393 vhdr->DeviceID == adev->pdev->device) { 394 adev->bios = kmemdup(&vbios->VbiosContent, 395 vhdr->ImageLength, 396 GFP_KERNEL); 397 398 if (!check_atom_bios(adev->bios, vhdr->ImageLength)) { 399 kfree(adev->bios); 400 return false; 401 } 402 adev->bios_size = vhdr->ImageLength; 403 return true; 404 } 405 } 406 407 DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n"); 408 return false; 409 } 410 #else 411 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) 412 { 413 return false; 414 } 415 #endif 416 417 bool amdgpu_get_bios(struct amdgpu_device *adev) 418 { 419 if (amdgpu_atrm_get_bios(adev)) 420 goto success; 421 422 if (amdgpu_acpi_vfct_bios(adev)) 423 goto success; 424 425 if (igp_read_bios_from_vram(adev)) 426 goto success; 427 428 if (amdgpu_read_bios(adev)) 429 goto success; 430 431 if (amdgpu_read_bios_from_rom(adev)) 432 goto success; 433 434 if (amdgpu_read_disabled_bios(adev)) 435 goto success; 436 437 if (amdgpu_read_platform_bios(adev)) 438 goto success; 439 440 DRM_ERROR("Unable to locate a BIOS ROM\n"); 441 return false; 442 443 success: 444 adev->is_atom_fw = (adev->asic_type >= CHIP_VEGA10) ? true : false; 445 return true; 446 } 447