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 uint8_t __iomem *bios; 195 size_t size; 196 197 adev->bios = NULL; 198 199 bios = pci_platform_rom(adev->pdev, &size); 200 if (!bios) { 201 return false; 202 } 203 204 adev->bios = kzalloc(size, GFP_KERNEL); 205 if (adev->bios == NULL) 206 return false; 207 208 memcpy_fromio(adev->bios, bios, size); 209 210 if (!check_atom_bios(adev->bios, size)) { 211 kfree(adev->bios); 212 return false; 213 } 214 215 adev->bios_size = size; 216 217 return true; 218 } 219 220 #ifdef CONFIG_ACPI 221 /* ATRM is used to get the BIOS on the discrete cards in 222 * dual-gpu systems. 223 */ 224 /* retrieve the ROM in 4k blocks */ 225 #define ATRM_BIOS_PAGE 4096 226 /** 227 * amdgpu_atrm_call - fetch a chunk of the vbios 228 * 229 * @atrm_handle: acpi ATRM handle 230 * @bios: vbios image pointer 231 * @offset: offset of vbios image data to fetch 232 * @len: length of vbios image data to fetch 233 * 234 * Executes ATRM to fetch a chunk of the discrete 235 * vbios image on PX systems (all asics). 236 * Returns the length of the buffer fetched. 237 */ 238 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios, 239 int offset, int len) 240 { 241 acpi_status status; 242 union acpi_object atrm_arg_elements[2], *obj; 243 struct acpi_object_list atrm_arg; 244 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 245 246 atrm_arg.count = 2; 247 atrm_arg.pointer = &atrm_arg_elements[0]; 248 249 atrm_arg_elements[0].type = ACPI_TYPE_INTEGER; 250 atrm_arg_elements[0].integer.value = offset; 251 252 atrm_arg_elements[1].type = ACPI_TYPE_INTEGER; 253 atrm_arg_elements[1].integer.value = len; 254 255 status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer); 256 if (ACPI_FAILURE(status)) { 257 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status)); 258 return -ENODEV; 259 } 260 261 obj = (union acpi_object *)buffer.pointer; 262 memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length); 263 len = obj->buffer.length; 264 kfree(buffer.pointer); 265 return len; 266 } 267 268 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) 269 { 270 int ret; 271 int size = 256 * 1024; 272 int i; 273 struct pci_dev *pdev = NULL; 274 acpi_handle dhandle, atrm_handle; 275 acpi_status status; 276 bool found = false; 277 278 /* ATRM is for the discrete card only */ 279 if (adev->flags & AMD_IS_APU) 280 return false; 281 282 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 283 dhandle = ACPI_HANDLE(&pdev->dev); 284 if (!dhandle) 285 continue; 286 287 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); 288 if (!ACPI_FAILURE(status)) { 289 found = true; 290 break; 291 } 292 } 293 294 if (!found) { 295 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) { 296 dhandle = ACPI_HANDLE(&pdev->dev); 297 if (!dhandle) 298 continue; 299 300 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); 301 if (!ACPI_FAILURE(status)) { 302 found = true; 303 break; 304 } 305 } 306 } 307 308 if (!found) 309 return false; 310 311 adev->bios = kmalloc(size, GFP_KERNEL); 312 if (!adev->bios) { 313 DRM_ERROR("Unable to allocate bios\n"); 314 return false; 315 } 316 317 for (i = 0; i < size / ATRM_BIOS_PAGE; i++) { 318 ret = amdgpu_atrm_call(atrm_handle, 319 adev->bios, 320 (i * ATRM_BIOS_PAGE), 321 ATRM_BIOS_PAGE); 322 if (ret < ATRM_BIOS_PAGE) 323 break; 324 } 325 326 if (!check_atom_bios(adev->bios, size)) { 327 kfree(adev->bios); 328 return false; 329 } 330 adev->bios_size = size; 331 return true; 332 } 333 #else 334 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) 335 { 336 return false; 337 } 338 #endif 339 340 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev) 341 { 342 if (adev->flags & AMD_IS_APU) 343 return igp_read_bios_from_vram(adev); 344 else 345 return amdgpu_asic_read_disabled_bios(adev); 346 } 347 348 #ifdef CONFIG_ACPI 349 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) 350 { 351 struct acpi_table_header *hdr; 352 acpi_size tbl_size; 353 UEFI_ACPI_VFCT *vfct; 354 unsigned offset; 355 356 if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr))) 357 return false; 358 tbl_size = hdr->length; 359 if (tbl_size < sizeof(UEFI_ACPI_VFCT)) { 360 DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n"); 361 return false; 362 } 363 364 vfct = (UEFI_ACPI_VFCT *)hdr; 365 offset = vfct->VBIOSImageOffset; 366 367 while (offset < tbl_size) { 368 GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset); 369 VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader; 370 371 offset += sizeof(VFCT_IMAGE_HEADER); 372 if (offset > tbl_size) { 373 DRM_ERROR("ACPI VFCT image header truncated\n"); 374 return false; 375 } 376 377 offset += vhdr->ImageLength; 378 if (offset > tbl_size) { 379 DRM_ERROR("ACPI VFCT image truncated\n"); 380 return false; 381 } 382 383 if (vhdr->ImageLength && 384 vhdr->PCIBus == adev->pdev->bus->number && 385 vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) && 386 vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) && 387 vhdr->VendorID == adev->pdev->vendor && 388 vhdr->DeviceID == adev->pdev->device) { 389 adev->bios = kmemdup(&vbios->VbiosContent, 390 vhdr->ImageLength, 391 GFP_KERNEL); 392 393 if (!check_atom_bios(adev->bios, vhdr->ImageLength)) { 394 kfree(adev->bios); 395 return false; 396 } 397 adev->bios_size = vhdr->ImageLength; 398 return true; 399 } 400 } 401 402 DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n"); 403 return false; 404 } 405 #else 406 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) 407 { 408 return false; 409 } 410 #endif 411 412 bool amdgpu_get_bios(struct amdgpu_device *adev) 413 { 414 if (amdgpu_atrm_get_bios(adev)) 415 goto success; 416 417 if (amdgpu_acpi_vfct_bios(adev)) 418 goto success; 419 420 if (igp_read_bios_from_vram(adev)) 421 goto success; 422 423 if (amdgpu_read_bios(adev)) 424 goto success; 425 426 if (amdgpu_read_bios_from_rom(adev)) 427 goto success; 428 429 if (amdgpu_read_disabled_bios(adev)) 430 goto success; 431 432 if (amdgpu_read_platform_bios(adev)) 433 goto success; 434 435 DRM_ERROR("Unable to locate a BIOS ROM\n"); 436 return false; 437 438 success: 439 adev->is_atom_fw = (adev->asic_type >= CHIP_VEGA10) ? true : false; 440 return true; 441 } 442