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