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 #include <drm/drmP.h>
29 #include "amdgpu.h"
30 #include "atom.h"
31 
32 #include <linux/slab.h>
33 #include <linux/acpi.h>
34 /*
35  * BIOS.
36  */
37 
38 #define AMD_VBIOS_SIGNATURE " 761295520"
39 #define AMD_VBIOS_SIGNATURE_OFFSET 0x30
40 #define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE)
41 #define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE)
42 #define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)
43 #define AMD_VBIOS_LENGTH(p) ((p)[2] << 9)
44 
45 /* If you boot an IGP board with a discrete card as the primary,
46  * the IGP rom is not accessible via the rom bar as the IGP rom is
47  * part of the system bios.  On boot, the system bios puts a
48  * copy of the igp rom at the start of vram if a discrete card is
49  * present.
50  */
51 static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
52 {
53 	uint8_t __iomem *bios;
54 	resource_size_t vram_base;
55 	resource_size_t size = 256 * 1024; /* ??? */
56 
57 	if (!(adev->flags & AMD_IS_APU))
58 		if (!amdgpu_card_posted(adev))
59 			return false;
60 
61 	adev->bios = NULL;
62 	vram_base = pci_resource_start(adev->pdev, 0);
63 	bios = ioremap(vram_base, size);
64 	if (!bios) {
65 		return false;
66 	}
67 
68 	if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) {
69 		iounmap(bios);
70 		return false;
71 	}
72 	adev->bios = kmalloc(size, GFP_KERNEL);
73 	if (adev->bios == NULL) {
74 		iounmap(bios);
75 		return false;
76 	}
77 	memcpy_fromio(adev->bios, bios, size);
78 	iounmap(bios);
79 	return true;
80 }
81 
82 bool amdgpu_read_bios(struct amdgpu_device *adev)
83 {
84 	uint8_t __iomem *bios, val[2];
85 	size_t size;
86 
87 	adev->bios = NULL;
88 	/* XXX: some cards may return 0 for rom size? ddx has a workaround */
89 	bios = pci_map_rom(adev->pdev, &size);
90 	if (!bios) {
91 		return false;
92 	}
93 
94 	val[0] = readb(&bios[0]);
95 	val[1] = readb(&bios[1]);
96 
97 	if (size == 0 || !AMD_IS_VALID_VBIOS(val)) {
98 		pci_unmap_rom(adev->pdev, bios);
99 		return false;
100 	}
101 	adev->bios = kzalloc(size, GFP_KERNEL);
102 	if (adev->bios == NULL) {
103 		pci_unmap_rom(adev->pdev, bios);
104 		return false;
105 	}
106 	memcpy_fromio(adev->bios, bios, size);
107 	pci_unmap_rom(adev->pdev, bios);
108 	return true;
109 }
110 
111 static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
112 {
113 	u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
114 	int len;
115 
116 	if (!adev->asic_funcs->read_bios_from_rom)
117 		return false;
118 
119 	/* validate VBIOS signature */
120 	if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)
121 		return false;
122 	header[AMD_VBIOS_SIGNATURE_END] = 0;
123 
124 	if ((!AMD_IS_VALID_VBIOS(header)) ||
125 	    0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
126 			AMD_VBIOS_SIGNATURE,
127 			strlen(AMD_VBIOS_SIGNATURE)))
128 		return false;
129 
130 	/* valid vbios, go on */
131 	len = AMD_VBIOS_LENGTH(header);
132 	len = ALIGN(len, 4);
133 	adev->bios = kmalloc(len, GFP_KERNEL);
134 	if (!adev->bios) {
135 		DRM_ERROR("no memory to allocate for BIOS\n");
136 		return false;
137 	}
138 
139 	/* read complete BIOS */
140 	return amdgpu_asic_read_bios_from_rom(adev, adev->bios, len);
141 }
142 
143 static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
144 {
145 	uint8_t __iomem *bios;
146 	size_t size;
147 
148 	adev->bios = NULL;
149 
150 	bios = pci_platform_rom(adev->pdev, &size);
151 	if (!bios) {
152 		return false;
153 	}
154 
155 	if (size == 0 || !AMD_IS_VALID_VBIOS(bios)) {
156 		return false;
157 	}
158 	adev->bios = kmemdup(bios, size, GFP_KERNEL);
159 	if (adev->bios == NULL) {
160 		return false;
161 	}
162 
163 	return true;
164 }
165 
166 #ifdef CONFIG_ACPI
167 /* ATRM is used to get the BIOS on the discrete cards in
168  * dual-gpu systems.
169  */
170 /* retrieve the ROM in 4k blocks */
171 #define ATRM_BIOS_PAGE 4096
172 /**
173  * amdgpu_atrm_call - fetch a chunk of the vbios
174  *
175  * @atrm_handle: acpi ATRM handle
176  * @bios: vbios image pointer
177  * @offset: offset of vbios image data to fetch
178  * @len: length of vbios image data to fetch
179  *
180  * Executes ATRM to fetch a chunk of the discrete
181  * vbios image on PX systems (all asics).
182  * Returns the length of the buffer fetched.
183  */
184 static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
185 			    int offset, int len)
186 {
187 	acpi_status status;
188 	union acpi_object atrm_arg_elements[2], *obj;
189 	struct acpi_object_list atrm_arg;
190 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
191 
192 	atrm_arg.count = 2;
193 	atrm_arg.pointer = &atrm_arg_elements[0];
194 
195 	atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
196 	atrm_arg_elements[0].integer.value = offset;
197 
198 	atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
199 	atrm_arg_elements[1].integer.value = len;
200 
201 	status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
202 	if (ACPI_FAILURE(status)) {
203 		printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
204 		return -ENODEV;
205 	}
206 
207 	obj = (union acpi_object *)buffer.pointer;
208 	memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
209 	len = obj->buffer.length;
210 	kfree(buffer.pointer);
211 	return len;
212 }
213 
214 static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
215 {
216 	int ret;
217 	int size = 256 * 1024;
218 	int i;
219 	struct pci_dev *pdev = NULL;
220 	acpi_handle dhandle, atrm_handle;
221 	acpi_status status;
222 	bool found = false;
223 
224 	/* ATRM is for the discrete card only */
225 	if (adev->flags & AMD_IS_APU)
226 		return false;
227 
228 	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
229 		dhandle = ACPI_HANDLE(&pdev->dev);
230 		if (!dhandle)
231 			continue;
232 
233 		status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
234 		if (!ACPI_FAILURE(status)) {
235 			found = true;
236 			break;
237 		}
238 	}
239 
240 	if (!found) {
241 		while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
242 			dhandle = ACPI_HANDLE(&pdev->dev);
243 			if (!dhandle)
244 				continue;
245 
246 			status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
247 			if (!ACPI_FAILURE(status)) {
248 				found = true;
249 				break;
250 			}
251 		}
252 	}
253 
254 	if (!found)
255 		return false;
256 
257 	adev->bios = kmalloc(size, GFP_KERNEL);
258 	if (!adev->bios) {
259 		DRM_ERROR("Unable to allocate bios\n");
260 		return false;
261 	}
262 
263 	for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
264 		ret = amdgpu_atrm_call(atrm_handle,
265 				       adev->bios,
266 				       (i * ATRM_BIOS_PAGE),
267 				       ATRM_BIOS_PAGE);
268 		if (ret < ATRM_BIOS_PAGE)
269 			break;
270 	}
271 
272 	if (i == 0 || !AMD_IS_VALID_VBIOS(adev->bios)) {
273 		kfree(adev->bios);
274 		return false;
275 	}
276 	return true;
277 }
278 #else
279 static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
280 {
281 	return false;
282 }
283 #endif
284 
285 static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
286 {
287 	if (adev->flags & AMD_IS_APU)
288 		return igp_read_bios_from_vram(adev);
289 	else
290 		return amdgpu_asic_read_disabled_bios(adev);
291 }
292 
293 #ifdef CONFIG_ACPI
294 static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
295 {
296 	bool ret = false;
297 	struct acpi_table_header *hdr;
298 	acpi_size tbl_size;
299 	UEFI_ACPI_VFCT *vfct;
300 	GOP_VBIOS_CONTENT *vbios;
301 	VFCT_IMAGE_HEADER *vhdr;
302 
303 	if (!ACPI_SUCCESS(acpi_get_table_with_size("VFCT", 1, &hdr, &tbl_size)))
304 		return false;
305 	if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
306 		DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n");
307 		goto out_unmap;
308 	}
309 
310 	vfct = (UEFI_ACPI_VFCT *)hdr;
311 	if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) > tbl_size) {
312 		DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n");
313 		goto out_unmap;
314 	}
315 
316 	vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + vfct->VBIOSImageOffset);
317 	vhdr = &vbios->VbiosHeader;
318 	DRM_INFO("ACPI VFCT contains a BIOS for %02x:%02x.%d %04x:%04x, size %d\n",
319 			vhdr->PCIBus, vhdr->PCIDevice, vhdr->PCIFunction,
320 			vhdr->VendorID, vhdr->DeviceID, vhdr->ImageLength);
321 
322 	if (vhdr->PCIBus != adev->pdev->bus->number ||
323 	    vhdr->PCIDevice != PCI_SLOT(adev->pdev->devfn) ||
324 	    vhdr->PCIFunction != PCI_FUNC(adev->pdev->devfn) ||
325 	    vhdr->VendorID != adev->pdev->vendor ||
326 	    vhdr->DeviceID != adev->pdev->device) {
327 		DRM_INFO("ACPI VFCT table is not for this card\n");
328 		goto out_unmap;
329 	}
330 
331 	if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) + vhdr->ImageLength > tbl_size) {
332 		DRM_ERROR("ACPI VFCT image truncated\n");
333 		goto out_unmap;
334 	}
335 
336 	adev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL);
337 	ret = !!adev->bios;
338 
339 out_unmap:
340 	return ret;
341 }
342 #else
343 static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
344 {
345 	return false;
346 }
347 #endif
348 
349 bool amdgpu_get_bios(struct amdgpu_device *adev)
350 {
351 	bool r;
352 	uint16_t tmp, bios_header_start;
353 
354 	r = amdgpu_atrm_get_bios(adev);
355 	if (!r)
356 		r = amdgpu_acpi_vfct_bios(adev);
357 	if (!r)
358 		r = igp_read_bios_from_vram(adev);
359 	if (!r)
360 		r = amdgpu_read_bios(adev);
361 	if (!r) {
362 		r = amdgpu_read_bios_from_rom(adev);
363 	}
364 	if (!r) {
365 		r = amdgpu_read_disabled_bios(adev);
366 	}
367 	if (!r) {
368 		r = amdgpu_read_platform_bios(adev);
369 	}
370 	if (!r || adev->bios == NULL) {
371 		DRM_ERROR("Unable to locate a BIOS ROM\n");
372 		adev->bios = NULL;
373 		return false;
374 	}
375 	if (!AMD_IS_VALID_VBIOS(adev->bios)) {
376 		printk("BIOS signature incorrect %x %x\n", adev->bios[0], adev->bios[1]);
377 		goto free_bios;
378 	}
379 
380 	tmp = RBIOS16(0x18);
381 	if (RBIOS8(tmp + 0x14) != 0x0) {
382 		DRM_INFO("Not an x86 BIOS ROM, not using.\n");
383 		goto free_bios;
384 	}
385 
386 	bios_header_start = RBIOS16(0x48);
387 	if (!bios_header_start) {
388 		goto free_bios;
389 	}
390 	tmp = bios_header_start + 4;
391 	if (!memcmp(adev->bios + tmp, "ATOM", 4) ||
392 	    !memcmp(adev->bios + tmp, "MOTA", 4)) {
393 		adev->is_atom_bios = true;
394 	} else {
395 		adev->is_atom_bios = false;
396 	}
397 
398 	DRM_DEBUG("%sBIOS detected\n", adev->is_atom_bios ? "ATOM" : "COM");
399 	return true;
400 free_bios:
401 	kfree(adev->bios);
402 	adev->bios = NULL;
403 	return false;
404 }
405