treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / gpu / drm / amd / amdgpu / amdgpu_bios.c
blob50dff69a0f6e3e93bd55bf8fdd99b61ea63b8ab7
1 /*
2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
24 * Authors: Dave Airlie
25 * Alex Deucher
26 * Jerome Glisse
29 #include "amdgpu.h"
30 #include "atom.h"
32 #include <linux/pci.h>
33 #include <linux/slab.h>
34 #include <linux/acpi.h>
36 * BIOS.
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)
46 /* Check if current bios is an ATOM BIOS.
47 * Return true if it is ATOM BIOS. Otherwise, return false.
49 static bool check_atom_bios(uint8_t *bios, size_t size)
51 uint16_t tmp, bios_header_start;
53 if (!bios || size < 0x49) {
54 DRM_INFO("vbios mem is null or mem size is wrong\n");
55 return false;
58 if (!AMD_IS_VALID_VBIOS(bios)) {
59 DRM_INFO("BIOS signature incorrect %x %x\n", bios[0], bios[1]);
60 return false;
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;
69 tmp = bios_header_start + 4;
70 if (size < tmp) {
71 DRM_INFO("BIOS header is broken\n");
72 return false;
75 if (!memcmp(bios + tmp, "ATOM", 4) ||
76 !memcmp(bios + tmp, "MOTA", 4)) {
77 DRM_DEBUG("ATOMBIOS detected\n");
78 return true;
81 return false;
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.
90 static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
92 uint8_t __iomem *bios;
93 resource_size_t vram_base;
94 resource_size_t size = 256 * 1024; /* ??? */
96 if (!(adev->flags & AMD_IS_APU))
97 if (amdgpu_device_need_post(adev))
98 return false;
100 adev->bios = NULL;
101 vram_base = pci_resource_start(adev->pdev, 0);
102 bios = ioremap_wc(vram_base, size);
103 if (!bios) {
104 return false;
107 adev->bios = kmalloc(size, GFP_KERNEL);
108 if (!adev->bios) {
109 iounmap(bios);
110 return false;
112 adev->bios_size = size;
113 memcpy_fromio(adev->bios, bios, size);
114 iounmap(bios);
116 if (!check_atom_bios(adev->bios, size)) {
117 kfree(adev->bios);
118 return false;
121 return true;
124 bool amdgpu_read_bios(struct amdgpu_device *adev)
126 uint8_t __iomem *bios;
127 size_t size;
129 adev->bios = NULL;
130 /* XXX: some cards may return 0 for rom size? ddx has a workaround */
131 bios = pci_map_rom(adev->pdev, &size);
132 if (!bios) {
133 return false;
136 adev->bios = kzalloc(size, GFP_KERNEL);
137 if (adev->bios == NULL) {
138 pci_unmap_rom(adev->pdev, bios);
139 return false;
141 adev->bios_size = size;
142 memcpy_fromio(adev->bios, bios, size);
143 pci_unmap_rom(adev->pdev, bios);
145 if (!check_atom_bios(adev->bios, size)) {
146 kfree(adev->bios);
147 return false;
150 return true;
153 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
155 u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
156 int len;
158 if (!adev->asic_funcs->read_bios_from_rom)
159 return false;
161 /* validate VBIOS signature */
162 if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)
163 return false;
164 header[AMD_VBIOS_SIGNATURE_END] = 0;
166 if ((!AMD_IS_VALID_VBIOS(header)) ||
167 0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
168 AMD_VBIOS_SIGNATURE,
169 strlen(AMD_VBIOS_SIGNATURE)))
170 return false;
172 /* valid vbios, go on */
173 len = AMD_VBIOS_LENGTH(header);
174 len = ALIGN(len, 4);
175 adev->bios = kmalloc(len, GFP_KERNEL);
176 if (!adev->bios) {
177 DRM_ERROR("no memory to allocate for BIOS\n");
178 return false;
180 adev->bios_size = len;
182 /* read complete BIOS */
183 amdgpu_asic_read_bios_from_rom(adev, adev->bios, len);
185 if (!check_atom_bios(adev->bios, len)) {
186 kfree(adev->bios);
187 return false;
190 return true;
193 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
195 uint8_t __iomem *bios;
196 size_t size;
198 adev->bios = NULL;
200 bios = pci_platform_rom(adev->pdev, &size);
201 if (!bios) {
202 return false;
205 adev->bios = kzalloc(size, GFP_KERNEL);
206 if (adev->bios == NULL)
207 return false;
209 memcpy_fromio(adev->bios, bios, size);
211 if (!check_atom_bios(adev->bios, size)) {
212 kfree(adev->bios);
213 return false;
216 adev->bios_size = size;
218 return true;
221 #ifdef CONFIG_ACPI
222 /* ATRM is used to get the BIOS on the discrete cards in
223 * dual-gpu systems.
225 /* retrieve the ROM in 4k blocks */
226 #define ATRM_BIOS_PAGE 4096
228 * amdgpu_atrm_call - fetch a chunk of the vbios
230 * @atrm_handle: acpi ATRM handle
231 * @bios: vbios image pointer
232 * @offset: offset of vbios image data to fetch
233 * @len: length of vbios image data to fetch
235 * Executes ATRM to fetch a chunk of the discrete
236 * vbios image on PX systems (all asics).
237 * Returns the length of the buffer fetched.
239 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
240 int offset, int len)
242 acpi_status status;
243 union acpi_object atrm_arg_elements[2], *obj;
244 struct acpi_object_list atrm_arg;
245 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
247 atrm_arg.count = 2;
248 atrm_arg.pointer = &atrm_arg_elements[0];
250 atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
251 atrm_arg_elements[0].integer.value = offset;
253 atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
254 atrm_arg_elements[1].integer.value = len;
256 status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
257 if (ACPI_FAILURE(status)) {
258 printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
259 return -ENODEV;
262 obj = (union acpi_object *)buffer.pointer;
263 memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
264 len = obj->buffer.length;
265 kfree(buffer.pointer);
266 return len;
269 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
271 int ret;
272 int size = 256 * 1024;
273 int i;
274 struct pci_dev *pdev = NULL;
275 acpi_handle dhandle, atrm_handle;
276 acpi_status status;
277 bool found = false;
279 /* ATRM is for the discrete card only */
280 if (adev->flags & AMD_IS_APU)
281 return false;
283 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
284 dhandle = ACPI_HANDLE(&pdev->dev);
285 if (!dhandle)
286 continue;
288 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
289 if (!ACPI_FAILURE(status)) {
290 found = true;
291 break;
295 if (!found) {
296 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
297 dhandle = ACPI_HANDLE(&pdev->dev);
298 if (!dhandle)
299 continue;
301 status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
302 if (!ACPI_FAILURE(status)) {
303 found = true;
304 break;
309 if (!found)
310 return false;
312 adev->bios = kmalloc(size, GFP_KERNEL);
313 if (!adev->bios) {
314 DRM_ERROR("Unable to allocate bios\n");
315 return false;
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;
327 if (!check_atom_bios(adev->bios, size)) {
328 kfree(adev->bios);
329 return false;
331 adev->bios_size = size;
332 return true;
334 #else
335 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
337 return false;
339 #endif
341 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
343 if (adev->flags & AMD_IS_APU)
344 return igp_read_bios_from_vram(adev);
345 else
346 return amdgpu_asic_read_disabled_bios(adev);
349 #ifdef CONFIG_ACPI
350 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
352 struct acpi_table_header *hdr;
353 acpi_size tbl_size;
354 UEFI_ACPI_VFCT *vfct;
355 unsigned offset;
357 if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
358 return false;
359 tbl_size = hdr->length;
360 if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
361 DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n");
362 return false;
365 vfct = (UEFI_ACPI_VFCT *)hdr;
366 offset = vfct->VBIOSImageOffset;
368 while (offset < tbl_size) {
369 GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset);
370 VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader;
372 offset += sizeof(VFCT_IMAGE_HEADER);
373 if (offset > tbl_size) {
374 DRM_ERROR("ACPI VFCT image header truncated\n");
375 return false;
378 offset += vhdr->ImageLength;
379 if (offset > tbl_size) {
380 DRM_ERROR("ACPI VFCT image truncated\n");
381 return false;
384 if (vhdr->ImageLength &&
385 vhdr->PCIBus == adev->pdev->bus->number &&
386 vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) &&
387 vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) &&
388 vhdr->VendorID == adev->pdev->vendor &&
389 vhdr->DeviceID == adev->pdev->device) {
390 adev->bios = kmemdup(&vbios->VbiosContent,
391 vhdr->ImageLength,
392 GFP_KERNEL);
394 if (!check_atom_bios(adev->bios, vhdr->ImageLength)) {
395 kfree(adev->bios);
396 return false;
398 adev->bios_size = vhdr->ImageLength;
399 return true;
403 DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n");
404 return false;
406 #else
407 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
409 return false;
411 #endif
413 bool amdgpu_get_bios(struct amdgpu_device *adev)
415 if (amdgpu_atrm_get_bios(adev))
416 goto success;
418 if (amdgpu_acpi_vfct_bios(adev))
419 goto success;
421 if (igp_read_bios_from_vram(adev))
422 goto success;
424 if (amdgpu_read_bios(adev))
425 goto success;
427 if (amdgpu_read_bios_from_rom(adev))
428 goto success;
430 if (amdgpu_read_disabled_bios(adev))
431 goto success;
433 if (amdgpu_read_platform_bios(adev))
434 goto success;
436 DRM_ERROR("Unable to locate a BIOS ROM\n");
437 return false;
439 success:
440 adev->is_atom_fw = (adev->asic_type >= CHIP_VEGA10) ? true : false;
441 return true;