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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
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
47
48
49static 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
85
86
87
88
89
90static 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
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
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
128bool amdgpu_read_bios(struct amdgpu_device *adev)
129{
130 uint8_t __iomem *bios;
131 size_t size;
132
133 adev->bios = NULL;
134
135 bios = pci_map_rom(adev->pdev, &size);
136 if (!bios) {
137 return false;
138 }
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
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 0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
172 AMD_VBIOS_SIGNATURE,
173 strlen(AMD_VBIOS_SIGNATURE)))
174 return false;
175
176
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
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
232
233
234
235#define ATRM_BIOS_PAGE 4096
236
237
238
239
240
241
242
243
244
245
246
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 printk("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
289 if (adev->flags & AMD_IS_APU)
290 return false;
291
292 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
293 dhandle = ACPI_HANDLE(&pdev->dev);
294 if (!dhandle)
295 continue;
296
297 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
298 if (ACPI_SUCCESS(status)) {
299 found = true;
300 break;
301 }
302 }
303
304 if (!found) {
305 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
306 dhandle = ACPI_HANDLE(&pdev->dev);
307 if (!dhandle)
308 continue;
309
310 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
311 if (ACPI_SUCCESS(status)) {
312 found = true;
313 break;
314 }
315 }
316 }
317
318 if (!found)
319 return false;
320
321 adev->bios = kmalloc(size, GFP_KERNEL);
322 if (!adev->bios) {
323 dev_err(adev->dev, "Unable to allocate bios\n");
324 return false;
325 }
326
327 for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
328 ret = amdgpu_atrm_call(atrm_handle,
329 adev->bios,
330 (i * ATRM_BIOS_PAGE),
331 ATRM_BIOS_PAGE);
332 if (ret < ATRM_BIOS_PAGE)
333 break;
334 }
335
336 if (!check_atom_bios(adev->bios, size)) {
337 kfree(adev->bios);
338 return false;
339 }
340 adev->bios_size = size;
341 return true;
342}
343#else
344static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
345{
346 return false;
347}
348#endif
349
350static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
351{
352 if (adev->flags & AMD_IS_APU)
353 return igp_read_bios_from_vram(adev);
354 else
355 return (!adev->asic_funcs || !adev->asic_funcs->read_disabled_bios) ?
356 false : amdgpu_asic_read_disabled_bios(adev);
357}
358
359#ifdef CONFIG_ACPI
360static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
361{
362 struct acpi_table_header *hdr;
363 acpi_size tbl_size;
364 UEFI_ACPI_VFCT *vfct;
365 unsigned offset;
366
367 if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
368 return false;
369 tbl_size = hdr->length;
370 if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
371 dev_info(adev->dev, "ACPI VFCT table present but broken (too short #1),skipping\n");
372 return false;
373 }
374
375 vfct = (UEFI_ACPI_VFCT *)hdr;
376 offset = vfct->VBIOSImageOffset;
377
378 while (offset < tbl_size) {
379 GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset);
380 VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader;
381
382 offset += sizeof(VFCT_IMAGE_HEADER);
383 if (offset > tbl_size) {
384 dev_info(adev->dev, "ACPI VFCT image header truncated,skipping\n");
385 return false;
386 }
387
388 offset += vhdr->ImageLength;
389 if (offset > tbl_size) {
390 dev_info(adev->dev, "ACPI VFCT image truncated,skipping\n");
391 return false;
392 }
393
394 if (vhdr->ImageLength &&
395 vhdr->PCIBus == adev->pdev->bus->number &&
396 vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) &&
397 vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) &&
398 vhdr->VendorID == adev->pdev->vendor &&
399 vhdr->DeviceID == adev->pdev->device) {
400 adev->bios = kmemdup(&vbios->VbiosContent,
401 vhdr->ImageLength,
402 GFP_KERNEL);
403
404 if (!check_atom_bios(adev->bios, vhdr->ImageLength)) {
405 kfree(adev->bios);
406 return false;
407 }
408 adev->bios_size = vhdr->ImageLength;
409 return true;
410 }
411 }
412
413 dev_info(adev->dev, "ACPI VFCT table present but broken (too short #2),skipping\n");
414 return false;
415}
416#else
417static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
418{
419 return false;
420}
421#endif
422
423bool amdgpu_get_bios(struct amdgpu_device *adev)
424{
425 if (amdgpu_atrm_get_bios(adev)) {
426 dev_info(adev->dev, "Fetched VBIOS from ATRM\n");
427 goto success;
428 }
429
430 if (amdgpu_acpi_vfct_bios(adev)) {
431 dev_info(adev->dev, "Fetched VBIOS from VFCT\n");
432 goto success;
433 }
434
435 if (igp_read_bios_from_vram(adev)) {
436 dev_info(adev->dev, "Fetched VBIOS from VRAM BAR\n");
437 goto success;
438 }
439
440 if (amdgpu_read_bios(adev)) {
441 dev_info(adev->dev, "Fetched VBIOS from ROM BAR\n");
442 goto success;
443 }
444
445 if (amdgpu_read_bios_from_rom(adev)) {
446 dev_info(adev->dev, "Fetched VBIOS from ROM\n");
447 goto success;
448 }
449
450 if (amdgpu_read_disabled_bios(adev)) {
451 dev_info(adev->dev, "Fetched VBIOS from disabled ROM BAR\n");
452 goto success;
453 }
454
455 if (amdgpu_read_platform_bios(adev)) {
456 dev_info(adev->dev, "Fetched VBIOS from platform\n");
457 goto success;
458 }
459
460 dev_err(adev->dev, "Unable to locate a BIOS ROM\n");
461 return false;
462
463success:
464 adev->is_atom_fw = (adev->asic_type >= CHIP_VEGA10) ? true : false;
465 return true;
466}
467