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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/device.h>
33#include <linux/pci.h>
34#include <linux/slab.h>
35#include <linux/acpi.h>
36/*
37 * BIOS.
38 */
39
40#define AMD_VBIOS_SIGNATURE " 761295520"
41#define AMD_VBIOS_SIGNATURE_OFFSET 0x30
42#define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE)
43#define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE)
44#define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)
45#define AMD_VBIOS_LENGTH(p) ((p)[2] << 9)
46
47/* Check if current bios is an ATOM BIOS.
48 * Return true if it is ATOM BIOS. Otherwise, return false.
49 */
50static bool check_atom_bios(uint8_t *bios, size_t size)
51{
52 uint16_t tmp, bios_header_start;
53
54 if (!bios || size < 0x49) {
55 DRM_INFO("vbios mem is null or mem size is wrong\n");
56 return false;
57 }
58
59 if (!AMD_IS_VALID_VBIOS(bios)) {
60 DRM_INFO("BIOS signature incorrect %x %x\n", bios[0], bios[1]);
61 return false;
62 }
63
64 bios_header_start = bios[0x48] | (bios[0x49] << 8);
65 if (!bios_header_start) {
66 DRM_INFO("Can't locate bios header\n");
67 return false;
68 }
69
70 tmp = bios_header_start + 4;
71 if (size < tmp) {
72 DRM_INFO("BIOS header is broken\n");
73 return false;
74 }
75
76 if (!memcmp(bios + tmp, "ATOM", 4) ||
77 !memcmp(bios + tmp, "MOTA", 4)) {
78 DRM_DEBUG("ATOMBIOS detected\n");
79 return true;
80 }
81
82 return false;
83}
84
85/* If you boot an IGP board with a discrete card as the primary,
86 * the IGP rom is not accessible via the rom bar as the IGP rom is
87 * part of the system bios. On boot, the system bios puts a
88 * copy of the igp rom at the start of vram if a discrete card is
89 * present.
90 * For SR-IOV, the vbios image is also put in VRAM in the VF.
91 */
92static bool amdgpu_read_bios_from_vram(struct amdgpu_device *adev)
93{
94 uint8_t __iomem *bios;
95 resource_size_t vram_base;
96 resource_size_t size = 256 * 1024; /* ??? */
97
98 if (!(adev->flags & AMD_IS_APU))
99 if (amdgpu_device_need_post(adev))
100 return false;
101
102 /* FB BAR not enabled */
103 if (pci_resource_len(adev->pdev, 0) == 0)
104 return false;
105
106 adev->bios = NULL;
107 vram_base = pci_resource_start(adev->pdev, 0);
108 bios = ioremap_wc(vram_base, size);
109 if (!bios)
110 return false;
111
112 adev->bios = kmalloc(size, GFP_KERNEL);
113 if (!adev->bios) {
114 iounmap(bios);
115 return false;
116 }
117 adev->bios_size = size;
118 memcpy_fromio(adev->bios, bios, size);
119 iounmap(bios);
120
121 if (!check_atom_bios(adev->bios, size)) {
122 kfree(adev->bios);
123 return false;
124 }
125
126 return true;
127}
128
129bool amdgpu_read_bios(struct amdgpu_device *adev)
130{
131 uint8_t __iomem *bios;
132 size_t size;
133
134 adev->bios = NULL;
135 /* XXX: some cards may return 0 for rom size? ddx has a workaround */
136 bios = pci_map_rom(adev->pdev, &size);
137 if (!bios)
138 return false;
139
140 adev->bios = kzalloc(size, GFP_KERNEL);
141 if (adev->bios == NULL) {
142 pci_unmap_rom(adev->pdev, bios);
143 return false;
144 }
145 adev->bios_size = size;
146 memcpy_fromio(adev->bios, bios, size);
147 pci_unmap_rom(adev->pdev, bios);
148
149 if (!check_atom_bios(adev->bios, size)) {
150 kfree(adev->bios);
151 return false;
152 }
153
154 return true;
155}
156
157static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
158{
159 u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
160 int len;
161
162 if (!adev->asic_funcs || !adev->asic_funcs->read_bios_from_rom)
163 return false;
164
165 /* validate VBIOS signature */
166 if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)
167 return false;
168 header[AMD_VBIOS_SIGNATURE_END] = 0;
169
170 if ((!AMD_IS_VALID_VBIOS(header)) ||
171 memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
172 AMD_VBIOS_SIGNATURE,
173 strlen(AMD_VBIOS_SIGNATURE)) != 0)
174 return false;
175
176 /* valid vbios, go on */
177 len = AMD_VBIOS_LENGTH(header);
178 len = ALIGN(len, 4);
179 adev->bios = kmalloc(len, GFP_KERNEL);
180 if (!adev->bios) {
181 DRM_ERROR("no memory to allocate for BIOS\n");
182 return false;
183 }
184 adev->bios_size = len;
185
186 /* read complete BIOS */
187 amdgpu_asic_read_bios_from_rom(adev, adev->bios, len);
188
189 if (!check_atom_bios(adev->bios, len)) {
190 kfree(adev->bios);
191 return false;
192 }
193
194 return true;
195}
196
197static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
198{
199 phys_addr_t rom = adev->pdev->rom;
200 size_t romlen = adev->pdev->romlen;
201 void __iomem *bios;
202
203 adev->bios = NULL;
204
205 if (!rom || romlen == 0)
206 return false;
207
208 adev->bios = kzalloc(romlen, GFP_KERNEL);
209 if (!adev->bios)
210 return false;
211
212 bios = ioremap(rom, romlen);
213 if (!bios)
214 goto free_bios;
215
216 memcpy_fromio(adev->bios, bios, romlen);
217 iounmap(bios);
218
219 if (!check_atom_bios(adev->bios, romlen))
220 goto free_bios;
221
222 adev->bios_size = romlen;
223
224 return true;
225free_bios:
226 kfree(adev->bios);
227 return false;
228}
229
230#ifdef CONFIG_ACPI
231/* ATRM is used to get the BIOS on the discrete cards in
232 * dual-gpu systems.
233 */
234/* retrieve the ROM in 4k blocks */
235#define ATRM_BIOS_PAGE 4096
236/**
237 * amdgpu_atrm_call - fetch a chunk of the vbios
238 *
239 * @atrm_handle: acpi ATRM handle
240 * @bios: vbios image pointer
241 * @offset: offset of vbios image data to fetch
242 * @len: length of vbios image data to fetch
243 *
244 * Executes ATRM to fetch a chunk of the discrete
245 * vbios image on PX systems (all asics).
246 * Returns the length of the buffer fetched.
247 */
248static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
249 int offset, int len)
250{
251 acpi_status status;
252 union acpi_object atrm_arg_elements[2], *obj;
253 struct acpi_object_list atrm_arg;
254 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
255
256 atrm_arg.count = 2;
257 atrm_arg.pointer = &atrm_arg_elements[0];
258
259 atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
260 atrm_arg_elements[0].integer.value = offset;
261
262 atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
263 atrm_arg_elements[1].integer.value = len;
264
265 status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
266 if (ACPI_FAILURE(status)) {
267 DRM_ERROR("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
268 return -ENODEV;
269 }
270
271 obj = (union acpi_object *)buffer.pointer;
272 memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
273 len = obj->buffer.length;
274 kfree(buffer.pointer);
275 return len;
276}
277
278static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
279{
280 int ret;
281 int size = 256 * 1024;
282 int i;
283 struct pci_dev *pdev = NULL;
284 acpi_handle dhandle, atrm_handle;
285 acpi_status status;
286 bool found = false;
287
288 /* ATRM is for on-platform devices only */
289 if (dev_is_removable(&adev->pdev->dev))
290 return false;
291
292 while ((pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) {
293 if ((pdev->class != PCI_CLASS_DISPLAY_VGA << 8) &&
294 (pdev->class != PCI_CLASS_DISPLAY_OTHER << 8))
295 continue;
296
297 dhandle = ACPI_HANDLE(&pdev->dev);
298 if (!dhandle)
299 continue;
300
301 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
302 if (ACPI_SUCCESS(status)) {
303 found = true;
304 break;
305 }
306 }
307
308 if (!found)
309 return false;
310 pci_dev_put(pdev);
311
312 adev->bios = kmalloc(size, GFP_KERNEL);
313 if (!adev->bios) {
314 dev_err(adev->dev, "Unable to allocate bios\n");
315 return false;
316 }
317
318 for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
319 ret = amdgpu_atrm_call(atrm_handle,
320 adev->bios,
321 (i * ATRM_BIOS_PAGE),
322 ATRM_BIOS_PAGE);
323 if (ret < ATRM_BIOS_PAGE)
324 break;
325 }
326
327 if (!check_atom_bios(adev->bios, size)) {
328 kfree(adev->bios);
329 return false;
330 }
331 adev->bios_size = size;
332 return true;
333}
334#else
335static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
336{
337 return false;
338}
339#endif
340
341static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
342{
343 return (!adev->asic_funcs || !adev->asic_funcs->read_disabled_bios) ?
344 false : amdgpu_asic_read_disabled_bios(adev);
345}
346
347#ifdef CONFIG_ACPI
348static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
349{
350 struct acpi_table_header *hdr;
351 acpi_size tbl_size;
352 UEFI_ACPI_VFCT *vfct;
353 unsigned int offset;
354
355 if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
356 return false;
357 tbl_size = hdr->length;
358 if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
359 dev_info(adev->dev, "ACPI VFCT table present but broken (too short #1),skipping\n");
360 return false;
361 }
362
363 vfct = (UEFI_ACPI_VFCT *)hdr;
364 offset = vfct->VBIOSImageOffset;
365
366 while (offset < tbl_size) {
367 GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset);
368 VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader;
369
370 offset += sizeof(VFCT_IMAGE_HEADER);
371 if (offset > tbl_size) {
372 dev_info(adev->dev, "ACPI VFCT image header truncated,skipping\n");
373 return false;
374 }
375
376 offset += vhdr->ImageLength;
377 if (offset > tbl_size) {
378 dev_info(adev->dev, "ACPI VFCT image truncated,skipping\n");
379 return false;
380 }
381
382 if (vhdr->ImageLength &&
383 vhdr->PCIBus == adev->pdev->bus->number &&
384 vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) &&
385 vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) &&
386 vhdr->VendorID == adev->pdev->vendor &&
387 vhdr->DeviceID == adev->pdev->device) {
388 adev->bios = kmemdup(&vbios->VbiosContent,
389 vhdr->ImageLength,
390 GFP_KERNEL);
391
392 if (!check_atom_bios(adev->bios, vhdr->ImageLength)) {
393 kfree(adev->bios);
394 return false;
395 }
396 adev->bios_size = vhdr->ImageLength;
397 return true;
398 }
399 }
400
401 dev_info(adev->dev, "ACPI VFCT table present but broken (too short #2),skipping\n");
402 return false;
403}
404#else
405static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
406{
407 return false;
408}
409#endif
410
411static bool amdgpu_get_bios_apu(struct amdgpu_device *adev)
412{
413 if (amdgpu_acpi_vfct_bios(adev)) {
414 dev_info(adev->dev, "Fetched VBIOS from VFCT\n");
415 goto success;
416 }
417
418 if (amdgpu_read_bios_from_vram(adev)) {
419 dev_info(adev->dev, "Fetched VBIOS from VRAM BAR\n");
420 goto success;
421 }
422
423 if (amdgpu_read_bios(adev)) {
424 dev_info(adev->dev, "Fetched VBIOS from ROM BAR\n");
425 goto success;
426 }
427
428 if (amdgpu_read_platform_bios(adev)) {
429 dev_info(adev->dev, "Fetched VBIOS from platform\n");
430 goto success;
431 }
432
433 dev_err(adev->dev, "Unable to locate a BIOS ROM\n");
434 return false;
435
436success:
437 return true;
438}
439
440static bool amdgpu_get_bios_dgpu(struct amdgpu_device *adev)
441{
442 if (amdgpu_atrm_get_bios(adev)) {
443 dev_info(adev->dev, "Fetched VBIOS from ATRM\n");
444 goto success;
445 }
446
447 if (amdgpu_acpi_vfct_bios(adev)) {
448 dev_info(adev->dev, "Fetched VBIOS from VFCT\n");
449 goto success;
450 }
451
452 /* this is required for SR-IOV */
453 if (amdgpu_read_bios_from_vram(adev)) {
454 dev_info(adev->dev, "Fetched VBIOS from VRAM BAR\n");
455 goto success;
456 }
457
458 if (amdgpu_read_platform_bios(adev)) {
459 dev_info(adev->dev, "Fetched VBIOS from platform\n");
460 goto success;
461 }
462
463 if (amdgpu_read_bios(adev)) {
464 dev_info(adev->dev, "Fetched VBIOS from ROM BAR\n");
465 goto success;
466 }
467
468 if (amdgpu_read_bios_from_rom(adev)) {
469 dev_info(adev->dev, "Fetched VBIOS from ROM\n");
470 goto success;
471 }
472
473 if (amdgpu_read_disabled_bios(adev)) {
474 dev_info(adev->dev, "Fetched VBIOS from disabled ROM BAR\n");
475 goto success;
476 }
477
478 dev_err(adev->dev, "Unable to locate a BIOS ROM\n");
479 return false;
480
481success:
482 return true;
483}
484
485bool amdgpu_get_bios(struct amdgpu_device *adev)
486{
487 bool found;
488
489 if (adev->flags & AMD_IS_APU)
490 found = amdgpu_get_bios_apu(adev);
491 else
492 found = amdgpu_get_bios_dgpu(adev);
493
494 if (found)
495 adev->is_atom_fw = adev->asic_type >= CHIP_VEGA10;
496
497 return found;
498}
499
500/* helper function for soc15 and onwards to read bios from rom */
501bool amdgpu_soc15_read_bios_from_rom(struct amdgpu_device *adev,
502 u8 *bios, u32 length_bytes)
503{
504 u32 *dw_ptr;
505 u32 i, length_dw;
506 u32 rom_offset;
507 u32 rom_index_offset;
508 u32 rom_data_offset;
509
510 if (bios == NULL)
511 return false;
512 if (length_bytes == 0)
513 return false;
514 /* APU vbios image is part of sbios image */
515 if (adev->flags & AMD_IS_APU)
516 return false;
517 if (!adev->smuio.funcs ||
518 !adev->smuio.funcs->get_rom_index_offset ||
519 !adev->smuio.funcs->get_rom_data_offset)
520 return false;
521
522 dw_ptr = (u32 *)bios;
523 length_dw = ALIGN(length_bytes, 4) / 4;
524
525 rom_index_offset =
526 adev->smuio.funcs->get_rom_index_offset(adev);
527 rom_data_offset =
528 adev->smuio.funcs->get_rom_data_offset(adev);
529
530 if (adev->nbio.funcs &&
531 adev->nbio.funcs->get_rom_offset) {
532 rom_offset = adev->nbio.funcs->get_rom_offset(adev);
533 rom_offset = rom_offset << 17;
534 } else {
535 rom_offset = 0;
536 }
537
538 /* set rom index to rom_offset */
539 WREG32(rom_index_offset, rom_offset);
540 /* read out the rom data */
541 for (i = 0; i < length_dw; i++)
542 dw_ptr[i] = RREG32(rom_data_offset);
543
544 return true;
545}