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
29 #include "amdgpu.h"
30 #include "atom.h"
31
32 #include <linux/pci.h>
33 #include <linux/slab.h>
34 #include <linux/acpi.h>
35 /*
36 * BIOS.
37 */
38
39 #define AMD_VBIOS_SIGNATURE " 761295520"
40 #define AMD_VBIOS_SIGNATURE_OFFSET 0x30
41 #define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE)
42 #define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE)
43 #define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)
44 #define AMD_VBIOS_LENGTH(p) ((p)[2] << 9)
45
46 /* Check if current bios is an ATOM BIOS.
47 * Return true if it is ATOM BIOS. Otherwise, return false.
48 */
check_atom_bios(uint8_t * bios,size_t size)49 static bool check_atom_bios(uint8_t *bios, size_t size)
50 {
51 uint16_t tmp, bios_header_start;
52
53 if (!bios || size < 0x49) {
54 DRM_INFO("vbios mem is null or mem size is wrong\n");
55 return false;
56 }
57
58 if (!AMD_IS_VALID_VBIOS(bios)) {
59 DRM_INFO("BIOS signature incorrect %x %x\n", bios[0], bios[1]);
60 return false;
61 }
62
63 bios_header_start = bios[0x48] | (bios[0x49] << 8);
64 if (!bios_header_start) {
65 DRM_INFO("Can't locate bios header\n");
66 return false;
67 }
68
69 tmp = bios_header_start + 4;
70 if (size < tmp) {
71 DRM_INFO("BIOS header is broken\n");
72 return false;
73 }
74
75 if (!memcmp(bios + tmp, "ATOM", 4) ||
76 !memcmp(bios + tmp, "MOTA", 4)) {
77 DRM_DEBUG("ATOMBIOS detected\n");
78 return true;
79 }
80
81 return false;
82 }
83
84 /* If you boot an IGP board with a discrete card as the primary,
85 * the IGP rom is not accessible via the rom bar as the IGP rom is
86 * part of the system bios. On boot, the system bios puts a
87 * copy of the igp rom at the start of vram if a discrete card is
88 * present.
89 */
igp_read_bios_from_vram(struct amdgpu_device * adev)90 static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
91 {
92 uint8_t __iomem *bios;
93 resource_size_t vram_base;
94 resource_size_t size = 256 * 1024; /* ??? */
95
96 if (!(adev->flags & AMD_IS_APU))
97 if (amdgpu_device_need_post(adev))
98 return false;
99
100 /* FB BAR not enabled */
101 if (pci_resource_len(adev->pdev, 0) == 0)
102 return false;
103
104 adev->bios = NULL;
105 vram_base = pci_resource_start(adev->pdev, 0);
106 bios = ioremap_wc(vram_base, size);
107 if (!bios)
108 return false;
109
110 adev->bios = kmalloc(size, GFP_KERNEL);
111 if (!adev->bios) {
112 iounmap(bios);
113 return false;
114 }
115 adev->bios_size = size;
116 memcpy_fromio(adev->bios, bios, size);
117 iounmap(bios);
118
119 if (!check_atom_bios(adev->bios, size)) {
120 kfree(adev->bios);
121 return false;
122 }
123
124 return true;
125 }
126
amdgpu_read_bios(struct amdgpu_device * adev)127 bool amdgpu_read_bios(struct amdgpu_device *adev)
128 {
129 uint8_t __iomem *bios;
130 size_t size;
131
132 adev->bios = NULL;
133 /* XXX: some cards may return 0 for rom size? ddx has a workaround */
134 bios = pci_map_rom(adev->pdev, &size);
135 if (!bios)
136 return false;
137
138 adev->bios = kzalloc(size, GFP_KERNEL);
139 if (adev->bios == NULL) {
140 pci_unmap_rom(adev->pdev, bios);
141 return false;
142 }
143 adev->bios_size = size;
144 memcpy_fromio(adev->bios, bios, size);
145 pci_unmap_rom(adev->pdev, bios);
146
147 if (!check_atom_bios(adev->bios, size)) {
148 kfree(adev->bios);
149 return false;
150 }
151
152 return true;
153 }
154
amdgpu_read_bios_from_rom(struct amdgpu_device * adev)155 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
156 {
157 u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
158 int len;
159
160 if (!adev->asic_funcs || !adev->asic_funcs->read_bios_from_rom)
161 return false;
162
163 /* validate VBIOS signature */
164 if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)
165 return false;
166 header[AMD_VBIOS_SIGNATURE_END] = 0;
167
168 if ((!AMD_IS_VALID_VBIOS(header)) ||
169 memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
170 AMD_VBIOS_SIGNATURE,
171 strlen(AMD_VBIOS_SIGNATURE)) != 0)
172 return false;
173
174 /* valid vbios, go on */
175 len = AMD_VBIOS_LENGTH(header);
176 len = ALIGN(len, 4);
177 adev->bios = kmalloc(len, GFP_KERNEL);
178 if (!adev->bios) {
179 DRM_ERROR("no memory to allocate for BIOS\n");
180 return false;
181 }
182 adev->bios_size = len;
183
184 /* read complete BIOS */
185 amdgpu_asic_read_bios_from_rom(adev, adev->bios, len);
186
187 if (!check_atom_bios(adev->bios, len)) {
188 kfree(adev->bios);
189 return false;
190 }
191
192 return true;
193 }
194
amdgpu_read_platform_bios(struct amdgpu_device * adev)195 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
196 {
197 phys_addr_t rom = adev->pdev->rom;
198 size_t romlen = adev->pdev->romlen;
199 void __iomem *bios;
200
201 adev->bios = NULL;
202
203 if (!rom || romlen == 0)
204 return false;
205
206 adev->bios = kzalloc(romlen, GFP_KERNEL);
207 if (!adev->bios)
208 return false;
209
210 bios = ioremap(rom, romlen);
211 if (!bios)
212 goto free_bios;
213
214 memcpy_fromio(adev->bios, bios, romlen);
215 iounmap(bios);
216
217 if (!check_atom_bios(adev->bios, romlen))
218 goto free_bios;
219
220 adev->bios_size = romlen;
221
222 return true;
223 free_bios:
224 kfree(adev->bios);
225 return false;
226 }
227
228 #ifdef CONFIG_ACPI
229 /* ATRM is used to get the BIOS on the discrete cards in
230 * dual-gpu systems.
231 */
232 /* retrieve the ROM in 4k blocks */
233 #define ATRM_BIOS_PAGE 4096
234 /**
235 * amdgpu_atrm_call - fetch a chunk of the vbios
236 *
237 * @atrm_handle: acpi ATRM handle
238 * @bios: vbios image pointer
239 * @offset: offset of vbios image data to fetch
240 * @len: length of vbios image data to fetch
241 *
242 * Executes ATRM to fetch a chunk of the discrete
243 * vbios image on PX systems (all asics).
244 * Returns the length of the buffer fetched.
245 */
amdgpu_atrm_call(acpi_handle atrm_handle,uint8_t * bios,int offset,int len)246 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
247 int offset, int len)
248 {
249 acpi_status status;
250 union acpi_object atrm_arg_elements[2], *obj;
251 struct acpi_object_list atrm_arg;
252 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
253
254 atrm_arg.count = 2;
255 atrm_arg.pointer = &atrm_arg_elements[0];
256
257 atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
258 atrm_arg_elements[0].integer.value = offset;
259
260 atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
261 atrm_arg_elements[1].integer.value = len;
262
263 status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
264 if (ACPI_FAILURE(status)) {
265 DRM_ERROR("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
266 return -ENODEV;
267 }
268
269 obj = (union acpi_object *)buffer.pointer;
270 memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
271 len = obj->buffer.length;
272 kfree(buffer.pointer);
273 return len;
274 }
275
amdgpu_atrm_get_bios(struct amdgpu_device * adev)276 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
277 {
278 int ret;
279 int size = 256 * 1024;
280 int i;
281 struct pci_dev *pdev = NULL;
282 acpi_handle dhandle, atrm_handle;
283 acpi_status status;
284 bool found = false;
285
286 /* ATRM is for the discrete card only */
287 if (adev->flags & AMD_IS_APU)
288 return false;
289
290 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
291 dhandle = ACPI_HANDLE(&pdev->dev);
292 if (!dhandle)
293 continue;
294
295 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
296 if (ACPI_SUCCESS(status)) {
297 found = true;
298 break;
299 }
300 }
301
302 if (!found) {
303 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
304 dhandle = ACPI_HANDLE(&pdev->dev);
305 if (!dhandle)
306 continue;
307
308 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
309 if (ACPI_SUCCESS(status)) {
310 found = true;
311 break;
312 }
313 }
314 }
315
316 if (!found)
317 return false;
318 pci_dev_put(pdev);
319
320 adev->bios = kmalloc(size, GFP_KERNEL);
321 if (!adev->bios) {
322 dev_err(adev->dev, "Unable to allocate bios\n");
323 return false;
324 }
325
326 for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
327 ret = amdgpu_atrm_call(atrm_handle,
328 adev->bios,
329 (i * ATRM_BIOS_PAGE),
330 ATRM_BIOS_PAGE);
331 if (ret < ATRM_BIOS_PAGE)
332 break;
333 }
334
335 if (!check_atom_bios(adev->bios, size)) {
336 kfree(adev->bios);
337 return false;
338 }
339 adev->bios_size = size;
340 return true;
341 }
342 #else
amdgpu_atrm_get_bios(struct amdgpu_device * adev)343 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
344 {
345 return false;
346 }
347 #endif
348
amdgpu_read_disabled_bios(struct amdgpu_device * adev)349 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
350 {
351 if (adev->flags & AMD_IS_APU)
352 return igp_read_bios_from_vram(adev);
353 else
354 return (!adev->asic_funcs || !adev->asic_funcs->read_disabled_bios) ?
355 false : amdgpu_asic_read_disabled_bios(adev);
356 }
357
358 #ifdef CONFIG_ACPI
amdgpu_acpi_vfct_bios(struct amdgpu_device * adev)359 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
360 {
361 struct acpi_table_header *hdr;
362 acpi_size tbl_size;
363 UEFI_ACPI_VFCT *vfct;
364 unsigned int offset;
365
366 if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
367 return false;
368 tbl_size = hdr->length;
369 if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
370 dev_info(adev->dev, "ACPI VFCT table present but broken (too short #1),skipping\n");
371 return false;
372 }
373
374 vfct = (UEFI_ACPI_VFCT *)hdr;
375 offset = vfct->VBIOSImageOffset;
376
377 while (offset < tbl_size) {
378 GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset);
379 VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader;
380
381 offset += sizeof(VFCT_IMAGE_HEADER);
382 if (offset > tbl_size) {
383 dev_info(adev->dev, "ACPI VFCT image header truncated,skipping\n");
384 return false;
385 }
386
387 offset += vhdr->ImageLength;
388 if (offset > tbl_size) {
389 dev_info(adev->dev, "ACPI VFCT image truncated,skipping\n");
390 return false;
391 }
392
393 if (vhdr->ImageLength &&
394 vhdr->PCIBus == adev->pdev->bus->number &&
395 vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) &&
396 vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) &&
397 vhdr->VendorID == adev->pdev->vendor &&
398 vhdr->DeviceID == adev->pdev->device) {
399 adev->bios = kmemdup(&vbios->VbiosContent,
400 vhdr->ImageLength,
401 GFP_KERNEL);
402
403 if (!check_atom_bios(adev->bios, vhdr->ImageLength)) {
404 kfree(adev->bios);
405 return false;
406 }
407 adev->bios_size = vhdr->ImageLength;
408 return true;
409 }
410 }
411
412 dev_info(adev->dev, "ACPI VFCT table present but broken (too short #2),skipping\n");
413 return false;
414 }
415 #else
amdgpu_acpi_vfct_bios(struct amdgpu_device * adev)416 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
417 {
418 return false;
419 }
420 #endif
421
amdgpu_get_bios(struct amdgpu_device * adev)422 bool amdgpu_get_bios(struct amdgpu_device *adev)
423 {
424 if (amdgpu_atrm_get_bios(adev)) {
425 dev_info(adev->dev, "Fetched VBIOS from ATRM\n");
426 goto success;
427 }
428
429 if (amdgpu_acpi_vfct_bios(adev)) {
430 dev_info(adev->dev, "Fetched VBIOS from VFCT\n");
431 goto success;
432 }
433
434 if (igp_read_bios_from_vram(adev)) {
435 dev_info(adev->dev, "Fetched VBIOS from VRAM BAR\n");
436 goto success;
437 }
438
439 if (amdgpu_read_bios(adev)) {
440 dev_info(adev->dev, "Fetched VBIOS from ROM BAR\n");
441 goto success;
442 }
443
444 if (amdgpu_read_bios_from_rom(adev)) {
445 dev_info(adev->dev, "Fetched VBIOS from ROM\n");
446 goto success;
447 }
448
449 if (amdgpu_read_disabled_bios(adev)) {
450 dev_info(adev->dev, "Fetched VBIOS from disabled ROM BAR\n");
451 goto success;
452 }
453
454 if (amdgpu_read_platform_bios(adev)) {
455 dev_info(adev->dev, "Fetched VBIOS from platform\n");
456 goto success;
457 }
458
459 dev_err(adev->dev, "Unable to locate a BIOS ROM\n");
460 return false;
461
462 success:
463 adev->is_atom_fw = adev->asic_type >= CHIP_VEGA10;
464 return true;
465 }
466
467 /* helper function for soc15 and onwards to read bios from rom */
amdgpu_soc15_read_bios_from_rom(struct amdgpu_device * adev,u8 * bios,u32 length_bytes)468 bool amdgpu_soc15_read_bios_from_rom(struct amdgpu_device *adev,
469 u8 *bios, u32 length_bytes)
470 {
471 u32 *dw_ptr;
472 u32 i, length_dw;
473 u32 rom_offset;
474 u32 rom_index_offset;
475 u32 rom_data_offset;
476
477 if (bios == NULL)
478 return false;
479 if (length_bytes == 0)
480 return false;
481 /* APU vbios image is part of sbios image */
482 if (adev->flags & AMD_IS_APU)
483 return false;
484 if (!adev->smuio.funcs ||
485 !adev->smuio.funcs->get_rom_index_offset ||
486 !adev->smuio.funcs->get_rom_data_offset)
487 return false;
488
489 dw_ptr = (u32 *)bios;
490 length_dw = ALIGN(length_bytes, 4) / 4;
491
492 rom_index_offset =
493 adev->smuio.funcs->get_rom_index_offset(adev);
494 rom_data_offset =
495 adev->smuio.funcs->get_rom_data_offset(adev);
496
497 if (adev->nbio.funcs &&
498 adev->nbio.funcs->get_rom_offset) {
499 rom_offset = adev->nbio.funcs->get_rom_offset(adev);
500 rom_offset = rom_offset << 17;
501 } else {
502 rom_offset = 0;
503 }
504
505 /* set rom index to rom_offset */
506 WREG32(rom_index_offset, rom_offset);
507 /* read out the rom data */
508 for (i = 0; i < length_dw; i++)
509 dw_ptr[i] = RREG32(rom_data_offset);
510
511 return true;
512 }
513
