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 /* If you boot an IGP board with a discrete card as the primary, 46 * the IGP rom is not accessible via the rom bar as the IGP rom is 47 * part of the system bios. On boot, the system bios puts a 48 * copy of the igp rom at the start of vram if a discrete card is 49 * present. 50 */ 51 static bool igp_read_bios_from_vram(struct amdgpu_device *adev) 52 { 53 uint8_t __iomem *bios; 54 resource_size_t vram_base; 55 resource_size_t size = 256 * 1024; /* ??? */ 56 57 if (!(adev->flags & AMD_IS_APU)) 58 if (!amdgpu_card_posted(adev)) 59 return false; 60 61 adev->bios = NULL; 62 vram_base = pci_resource_start(adev->pdev, 0); 63 bios = ioremap(vram_base, size); 64 if (!bios) { 65 return false; 66 } 67 68 if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) { 69 iounmap(bios); 70 return false; 71 } 72 adev->bios = kmalloc(size, GFP_KERNEL); 73 if (!adev->bios) { 74 iounmap(bios); 75 return false; 76 } 77 adev->bios_size = size; 78 memcpy_fromio(adev->bios, bios, size); 79 iounmap(bios); 80 return true; 81 } 82 83 bool amdgpu_read_bios(struct amdgpu_device *adev) 84 { 85 uint8_t __iomem *bios, val[2]; 86 size_t size; 87 88 adev->bios = NULL; 89 /* XXX: some cards may return 0 for rom size? ddx has a workaround */ 90 bios = pci_map_rom(adev->pdev, &size); 91 if (!bios) { 92 return false; 93 } 94 95 val[0] = readb(&bios[0]); 96 val[1] = readb(&bios[1]); 97 98 if (size == 0 || !AMD_IS_VALID_VBIOS(val)) { 99 pci_unmap_rom(adev->pdev, bios); 100 return false; 101 } 102 adev->bios = kzalloc(size, GFP_KERNEL); 103 if (adev->bios == NULL) { 104 pci_unmap_rom(adev->pdev, bios); 105 return false; 106 } 107 adev->bios_size = size; 108 memcpy_fromio(adev->bios, bios, size); 109 pci_unmap_rom(adev->pdev, bios); 110 return true; 111 } 112 113 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev) 114 { 115 u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0}; 116 int len; 117 118 if (!adev->asic_funcs->read_bios_from_rom) 119 return false; 120 121 /* validate VBIOS signature */ 122 if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false) 123 return false; 124 header[AMD_VBIOS_SIGNATURE_END] = 0; 125 126 if ((!AMD_IS_VALID_VBIOS(header)) || 127 0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET], 128 AMD_VBIOS_SIGNATURE, 129 strlen(AMD_VBIOS_SIGNATURE))) 130 return false; 131 132 /* valid vbios, go on */ 133 len = AMD_VBIOS_LENGTH(header); 134 len = ALIGN(len, 4); 135 adev->bios = kmalloc(len, GFP_KERNEL); 136 if (!adev->bios) { 137 DRM_ERROR("no memory to allocate for BIOS\n"); 138 return false; 139 } 140 adev->bios_size = len; 141 142 /* read complete BIOS */ 143 return amdgpu_asic_read_bios_from_rom(adev, adev->bios, len); 144 } 145 146 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev) 147 { 148 uint8_t __iomem *bios; 149 size_t size; 150 151 adev->bios = NULL; 152 153 bios = pci_platform_rom(adev->pdev, &size); 154 if (!bios) { 155 return false; 156 } 157 158 if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) { 159 return false; 160 } 161 adev->bios = kmemdup(bios, size, GFP_KERNEL); 162 if (adev->bios == NULL) { 163 return false; 164 } 165 adev->bios_size = size; 166 167 return true; 168 } 169 170 #ifdef CONFIG_ACPI 171 /* ATRM is used to get the BIOS on the discrete cards in 172 * dual-gpu systems. 173 */ 174 /* retrieve the ROM in 4k blocks */ 175 #define ATRM_BIOS_PAGE 4096 176 /** 177 * amdgpu_atrm_call - fetch a chunk of the vbios 178 * 179 * @atrm_handle: acpi ATRM handle 180 * @bios: vbios image pointer 181 * @offset: offset of vbios image data to fetch 182 * @len: length of vbios image data to fetch 183 * 184 * Executes ATRM to fetch a chunk of the discrete 185 * vbios image on PX systems (all asics). 186 * Returns the length of the buffer fetched. 187 */ 188 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios, 189 int offset, int len) 190 { 191 acpi_status status; 192 union acpi_object atrm_arg_elements[2], *obj; 193 struct acpi_object_list atrm_arg; 194 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 195 196 atrm_arg.count = 2; 197 atrm_arg.pointer = &atrm_arg_elements[0]; 198 199 atrm_arg_elements[0].type = ACPI_TYPE_INTEGER; 200 atrm_arg_elements[0].integer.value = offset; 201 202 atrm_arg_elements[1].type = ACPI_TYPE_INTEGER; 203 atrm_arg_elements[1].integer.value = len; 204 205 status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer); 206 if (ACPI_FAILURE(status)) { 207 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status)); 208 return -ENODEV; 209 } 210 211 obj = (union acpi_object *)buffer.pointer; 212 memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length); 213 len = obj->buffer.length; 214 kfree(buffer.pointer); 215 return len; 216 } 217 218 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) 219 { 220 int ret; 221 int size = 256 * 1024; 222 int i; 223 struct pci_dev *pdev = NULL; 224 acpi_handle dhandle, atrm_handle; 225 acpi_status status; 226 bool found = false; 227 228 /* ATRM is for the discrete card only */ 229 if (adev->flags & AMD_IS_APU) 230 return false; 231 232 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 233 dhandle = ACPI_HANDLE(&pdev->dev); 234 if (!dhandle) 235 continue; 236 237 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); 238 if (!ACPI_FAILURE(status)) { 239 found = true; 240 break; 241 } 242 } 243 244 if (!found) { 245 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) { 246 dhandle = ACPI_HANDLE(&pdev->dev); 247 if (!dhandle) 248 continue; 249 250 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle); 251 if (!ACPI_FAILURE(status)) { 252 found = true; 253 break; 254 } 255 } 256 } 257 258 if (!found) 259 return false; 260 261 adev->bios = kmalloc(size, GFP_KERNEL); 262 if (!adev->bios) { 263 DRM_ERROR("Unable to allocate bios\n"); 264 return false; 265 } 266 267 for (i = 0; i < size / ATRM_BIOS_PAGE; i++) { 268 ret = amdgpu_atrm_call(atrm_handle, 269 adev->bios, 270 (i * ATRM_BIOS_PAGE), 271 ATRM_BIOS_PAGE); 272 if (ret < ATRM_BIOS_PAGE) 273 break; 274 } 275 276 if (i == 0 || !AMD_IS_VALID_VBIOS(adev->bios)) { 277 kfree(adev->bios); 278 return false; 279 } 280 adev->bios_size = size; 281 return true; 282 } 283 #else 284 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev) 285 { 286 return false; 287 } 288 #endif 289 290 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev) 291 { 292 if (adev->flags & AMD_IS_APU) 293 return igp_read_bios_from_vram(adev); 294 else 295 return amdgpu_asic_read_disabled_bios(adev); 296 } 297 298 #ifdef CONFIG_ACPI 299 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) 300 { 301 bool ret = false; 302 struct acpi_table_header *hdr; 303 acpi_size tbl_size; 304 UEFI_ACPI_VFCT *vfct; 305 GOP_VBIOS_CONTENT *vbios; 306 VFCT_IMAGE_HEADER *vhdr; 307 308 if (!ACPI_SUCCESS(acpi_get_table_with_size("VFCT", 1, &hdr, &tbl_size))) 309 return false; 310 if (tbl_size < sizeof(UEFI_ACPI_VFCT)) { 311 DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n"); 312 goto out_unmap; 313 } 314 315 vfct = (UEFI_ACPI_VFCT *)hdr; 316 if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) > tbl_size) { 317 DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n"); 318 goto out_unmap; 319 } 320 321 vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + vfct->VBIOSImageOffset); 322 vhdr = &vbios->VbiosHeader; 323 DRM_INFO("ACPI VFCT contains a BIOS for %02x:%02x.%d %04x:%04x, size %d\n", 324 vhdr->PCIBus, vhdr->PCIDevice, vhdr->PCIFunction, 325 vhdr->VendorID, vhdr->DeviceID, vhdr->ImageLength); 326 327 if (vhdr->PCIBus != adev->pdev->bus->number || 328 vhdr->PCIDevice != PCI_SLOT(adev->pdev->devfn) || 329 vhdr->PCIFunction != PCI_FUNC(adev->pdev->devfn) || 330 vhdr->VendorID != adev->pdev->vendor || 331 vhdr->DeviceID != adev->pdev->device) { 332 DRM_INFO("ACPI VFCT table is not for this card\n"); 333 goto out_unmap; 334 } 335 336 if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) + vhdr->ImageLength > tbl_size) { 337 DRM_ERROR("ACPI VFCT image truncated\n"); 338 goto out_unmap; 339 } 340 341 adev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL); 342 adev->bios_size = vhdr->ImageLength; 343 ret = !!adev->bios; 344 345 out_unmap: 346 return ret; 347 } 348 #else 349 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev) 350 { 351 return false; 352 } 353 #endif 354 355 bool amdgpu_get_bios(struct amdgpu_device *adev) 356 { 357 bool r; 358 uint16_t tmp, bios_header_start; 359 360 r = amdgpu_atrm_get_bios(adev); 361 if (!r) 362 r = amdgpu_acpi_vfct_bios(adev); 363 if (!r) 364 r = igp_read_bios_from_vram(adev); 365 if (!r) 366 r = amdgpu_read_bios(adev); 367 if (!r) { 368 r = amdgpu_read_bios_from_rom(adev); 369 } 370 if (!r) { 371 r = amdgpu_read_disabled_bios(adev); 372 } 373 if (!r) { 374 r = amdgpu_read_platform_bios(adev); 375 } 376 if (!r || adev->bios == NULL) { 377 DRM_ERROR("Unable to locate a BIOS ROM\n"); 378 adev->bios = NULL; 379 return false; 380 } 381 if (!AMD_IS_VALID_VBIOS(adev->bios)) { 382 printk("BIOS signature incorrect %x %x\n", adev->bios[0], adev->bios[1]); 383 goto free_bios; 384 } 385 386 tmp = RBIOS16(0x18); 387 if (RBIOS8(tmp + 0x14) != 0x0) { 388 DRM_INFO("Not an x86 BIOS ROM, not using.\n"); 389 goto free_bios; 390 } 391 392 bios_header_start = RBIOS16(0x48); 393 if (!bios_header_start) { 394 goto free_bios; 395 } 396 tmp = bios_header_start + 4; 397 if (!memcmp(adev->bios + tmp, "ATOM", 4) || 398 !memcmp(adev->bios + tmp, "MOTA", 4)) { 399 adev->is_atom_bios = true; 400 } else { 401 adev->is_atom_bios = false; 402 } 403 404 DRM_DEBUG("%sBIOS detected\n", adev->is_atom_bios ? "ATOM" : "COM"); 405 return true; 406 free_bios: 407 kfree(adev->bios); 408 adev->bios = NULL; 409 return false; 410 } 411