1 files changed, 467 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
new file mode 100644
index 000000000..02a73b9e0
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
@@ -0,0 +1,467 @@
+/*
+ * Copyright 2008 Advanced Micro Devices, Inc.
+ * Copyright 2008 Red Hat Inc.
+ * Copyright 2009 Jerome Glisse.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Dave Airlie
+ *          Alex Deucher
+ *          Jerome Glisse
+ */
+
+#include "amdgpu.h"
+#include "atom.h"
+
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+/*
+ * BIOS.
+ */
+
+#define AMD_VBIOS_SIGNATURE " 761295520"
+#define AMD_VBIOS_SIGNATURE_OFFSET 0x30
+#define AMD_VBIOS_SIGNATURE_SIZE sizeof(AMD_VBIOS_SIGNATURE)
+#define AMD_VBIOS_SIGNATURE_END (AMD_VBIOS_SIGNATURE_OFFSET + AMD_VBIOS_SIGNATURE_SIZE)
+#define AMD_IS_VALID_VBIOS(p) ((p)[0] == 0x55 && (p)[1] == 0xAA)
+#define AMD_VBIOS_LENGTH(p) ((p)[2] << 9)
+
+/* Check if current bios is an ATOM BIOS.
+ * Return true if it is ATOM BIOS. Otherwise, return false.
+ */
+static bool check_atom_bios(uint8_t *bios, size_t size)
+{
+	uint16_t tmp, bios_header_start;
+
+	if (!bios || size < 0x49) {
+		DRM_INFO("vbios mem is null or mem size is wrong\n");
+		return false;
+	}
+
+	if (!AMD_IS_VALID_VBIOS(bios)) {
+		DRM_INFO("BIOS signature incorrect %x %x\n", bios[0], bios[1]);
+		return false;
+	}
+
+	bios_header_start = bios[0x48] | (bios[0x49] << 8);
+	if (!bios_header_start) {
+		DRM_INFO("Can't locate bios header\n");
+		return false;
+	}
+
+	tmp = bios_header_start + 4;
+	if (size < tmp) {
+		DRM_INFO("BIOS header is broken\n");
+		return false;
+	}
+
+	if (!memcmp(bios + tmp, "ATOM", 4) ||
+	    !memcmp(bios + tmp, "MOTA", 4)) {
+		DRM_DEBUG("ATOMBIOS detected\n");
+		return true;
+	}
+
+	return false;
+}
+
+/* If you boot an IGP board with a discrete card as the primary,
+ * the IGP rom is not accessible via the rom bar as the IGP rom is
+ * part of the system bios.  On boot, the system bios puts a
+ * copy of the igp rom at the start of vram if a discrete card is
+ * present.
+ */
+static bool igp_read_bios_from_vram(struct amdgpu_device *adev)
+{
+	uint8_t __iomem *bios;
+	resource_size_t vram_base;
+	resource_size_t size = 256 * 1024; /* ??? */
+
+	if (!(adev->flags & AMD_IS_APU))
+		if (amdgpu_device_need_post(adev))
+			return false;
+
+	adev->bios = NULL;
+	vram_base = pci_resource_start(adev->pdev, 0);
+	bios = ioremap_wc(vram_base, size);
+	if (!bios) {
+		return false;
+	}
+
+	adev->bios = kmalloc(size, GFP_KERNEL);
+	if (!adev->bios) {
+		iounmap(bios);
+		return false;
+	}
+	adev->bios_size = size;
+	memcpy_fromio(adev->bios, bios, size);
+	iounmap(bios);
+
+	if (!check_atom_bios(adev->bios, size)) {
+		kfree(adev->bios);
+		return false;
+	}
+
+	return true;
+}
+
+bool amdgpu_read_bios(struct amdgpu_device *adev)
+{
+	uint8_t __iomem *bios;
+	size_t size;
+
+	adev->bios = NULL;
+	/* XXX: some cards may return 0 for rom size? ddx has a workaround */
+	bios = pci_map_rom(adev->pdev, &size);
+	if (!bios) {
+		return false;
+	}
+
+	adev->bios = kzalloc(size, GFP_KERNEL);
+	if (adev->bios == NULL) {
+		pci_unmap_rom(adev->pdev, bios);
+		return false;
+	}
+	adev->bios_size = size;
+	memcpy_fromio(adev->bios, bios, size);
+	pci_unmap_rom(adev->pdev, bios);
+
+	if (!check_atom_bios(adev->bios, size)) {
+		kfree(adev->bios);
+		return false;
+	}
+
+	return true;
+}
+
+static bool amdgpu_read_bios_from_rom(struct amdgpu_device *adev)
+{
+	u8 header[AMD_VBIOS_SIGNATURE_END+1] = {0};
+	int len;
+
+	if (!adev->asic_funcs->read_bios_from_rom)
+		return false;
+
+	/* validate VBIOS signature */
+	if (amdgpu_asic_read_bios_from_rom(adev, &header[0], sizeof(header)) == false)
+		return false;
+	header[AMD_VBIOS_SIGNATURE_END] = 0;
+
+	if ((!AMD_IS_VALID_VBIOS(header)) ||
+	    0 != memcmp((char *)&header[AMD_VBIOS_SIGNATURE_OFFSET],
+			AMD_VBIOS_SIGNATURE,
+			strlen(AMD_VBIOS_SIGNATURE)))
+		return false;
+
+	/* valid vbios, go on */
+	len = AMD_VBIOS_LENGTH(header);
+	len = ALIGN(len, 4);
+	adev->bios = kmalloc(len, GFP_KERNEL);
+	if (!adev->bios) {
+		DRM_ERROR("no memory to allocate for BIOS\n");
+		return false;
+	}
+	adev->bios_size = len;
+
+	/* read complete BIOS */
+	amdgpu_asic_read_bios_from_rom(adev, adev->bios, len);
+
+	if (!check_atom_bios(adev->bios, len)) {
+		kfree(adev->bios);
+		return false;
+	}
+
+	return true;
+}
+
+static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
+{
+	phys_addr_t rom = adev->pdev->rom;
+	size_t romlen = adev->pdev->romlen;
+	void __iomem *bios;
+
+	adev->bios = NULL;
+
+	if (!rom || romlen == 0)
+		return false;
+
+	adev->bios = kzalloc(romlen, GFP_KERNEL);
+	if (!adev->bios)
+		return false;
+
+	bios = ioremap(rom, romlen);
+	if (!bios)
+		goto free_bios;
+
+	memcpy_fromio(adev->bios, bios, romlen);
+	iounmap(bios);
+
+	if (!check_atom_bios(adev->bios, romlen))
+		goto free_bios;
+
+	adev->bios_size = romlen;
+
+	return true;
+free_bios:
+	kfree(adev->bios);
+	return false;
+}
+
+#ifdef CONFIG_ACPI
+/* ATRM is used to get the BIOS on the discrete cards in
+ * dual-gpu systems.
+ */
+/* retrieve the ROM in 4k blocks */
+#define ATRM_BIOS_PAGE 4096
+/**
+ * amdgpu_atrm_call - fetch a chunk of the vbios
+ *
+ * @atrm_handle: acpi ATRM handle
+ * @bios: vbios image pointer
+ * @offset: offset of vbios image data to fetch
+ * @len: length of vbios image data to fetch
+ *
+ * Executes ATRM to fetch a chunk of the discrete
+ * vbios image on PX systems (all asics).
+ * Returns the length of the buffer fetched.
+ */
+static int amdgpu_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
+			    int offset, int len)
+{
+	acpi_status status;
+	union acpi_object atrm_arg_elements[2], *obj;
+	struct acpi_object_list atrm_arg;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
+
+	atrm_arg.count = 2;
+	atrm_arg.pointer = &atrm_arg_elements[0];
+
+	atrm_arg_elements[0].type = ACPI_TYPE_INTEGER;
+	atrm_arg_elements[0].integer.value = offset;
+
+	atrm_arg_elements[1].type = ACPI_TYPE_INTEGER;
+	atrm_arg_elements[1].integer.value = len;
+
+	status = acpi_evaluate_object(atrm_handle, NULL, &atrm_arg, &buffer);
+	if (ACPI_FAILURE(status)) {
+		printk("failed to evaluate ATRM got %s\n", acpi_format_exception(status));
+		return -ENODEV;
+	}
+
+	obj = (union acpi_object *)buffer.pointer;
+	memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
+	len = obj->buffer.length;
+	kfree(buffer.pointer);
+	return len;
+}
+
+static bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
+{
+	int ret;
+	int size = 256 * 1024;
+	int i;
+	struct pci_dev *pdev = NULL;
+	acpi_handle dhandle, atrm_handle;
+	acpi_status status;
+	bool found = false;
+
+	/* ATRM is for the discrete card only */
+	if (adev->flags & AMD_IS_APU)
+		return false;
+
+	/* ATRM is for on-platform devices only */
+	if (dev_is_removable(&adev->pdev->dev))
+		return false;
+
+	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
+		dhandle = ACPI_HANDLE(&pdev->dev);
+		if (!dhandle)
+			continue;
+
+		status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
+		if (!ACPI_FAILURE(status)) {
+			found = true;
+			break;
+		}
+	}
+
+	if (!found) {
+		while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
+			dhandle = ACPI_HANDLE(&pdev->dev);
+			if (!dhandle)
+				continue;
+
+			status = acpi_get_handle(dhandle, "ATRM", &atrm_handle);
+			if (!ACPI_FAILURE(status)) {
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return false;
+	pci_dev_put(pdev);
+
+	adev->bios = kmalloc(size, GFP_KERNEL);
+	if (!adev->bios) {
+		DRM_ERROR("Unable to allocate bios\n");
+		return false;
+	}
+
+	for (i = 0; i < size / ATRM_BIOS_PAGE; i++) {
+		ret = amdgpu_atrm_call(atrm_handle,
+				       adev->bios,
+				       (i * ATRM_BIOS_PAGE),
+				       ATRM_BIOS_PAGE);
+		if (ret < ATRM_BIOS_PAGE)
+			break;
+	}
+
+	if (!check_atom_bios(adev->bios, size)) {
+		kfree(adev->bios);
+		return false;
+	}
+	adev->bios_size = size;
+	return true;
+}
+#else
+static inline bool amdgpu_atrm_get_bios(struct amdgpu_device *adev)
+{
+	return false;
+}
+#endif
+
+static bool amdgpu_read_disabled_bios(struct amdgpu_device *adev)
+{
+	if (adev->flags & AMD_IS_APU)
+		return igp_read_bios_from_vram(adev);
+	else
+		return amdgpu_asic_read_disabled_bios(adev);
+}
+
+#ifdef CONFIG_ACPI
+static bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
+{
+	struct acpi_table_header *hdr;
+	acpi_size tbl_size;
+	UEFI_ACPI_VFCT *vfct;
+	unsigned offset;
+
+	if (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
+		return false;
+	tbl_size = hdr->length;
+	if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
+		DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n");
+		return false;
+	}
+
+	vfct = (UEFI_ACPI_VFCT *)hdr;
+	offset = vfct->VBIOSImageOffset;
+
+	while (offset < tbl_size) {
+		GOP_VBIOS_CONTENT *vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + offset);
+		VFCT_IMAGE_HEADER *vhdr = &vbios->VbiosHeader;
+
+		offset += sizeof(VFCT_IMAGE_HEADER);
+		if (offset > tbl_size) {
+			DRM_ERROR("ACPI VFCT image header truncated\n");
+			return false;
+		}
+
+		offset += vhdr->ImageLength;
+		if (offset > tbl_size) {
+			DRM_ERROR("ACPI VFCT image truncated\n");
+			return false;
+		}
+
+		if (vhdr->ImageLength &&
+		    vhdr->PCIBus == adev->pdev->bus->number &&
+		    vhdr->PCIDevice == PCI_SLOT(adev->pdev->devfn) &&
+		    vhdr->PCIFunction == PCI_FUNC(adev->pdev->devfn) &&
+		    vhdr->VendorID == adev->pdev->vendor &&
+		    vhdr->DeviceID == adev->pdev->device) {
+			adev->bios = kmemdup(&vbios->VbiosContent,
+					     vhdr->ImageLength,
+					     GFP_KERNEL);
+
+			if (!check_atom_bios(adev->bios, vhdr->ImageLength)) {
+				kfree(adev->bios);
+				return false;
+			}
+			adev->bios_size = vhdr->ImageLength;
+			return true;
+		}
+	}
+
+	DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n");
+	return false;
+}
+#else
+static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
+{
+	return false;
+}
+#endif
+
+bool amdgpu_get_bios(struct amdgpu_device *adev)
+{
+	if (amdgpu_atrm_get_bios(adev)) {
+		dev_info(adev->dev, "Fetched VBIOS from ATRM\n");
+		goto success;
+	}
+
+	if (amdgpu_acpi_vfct_bios(adev)) {
+		dev_info(adev->dev, "Fetched VBIOS from VFCT\n");
+		goto success;
+	}
+
+	if (igp_read_bios_from_vram(adev)) {
+		dev_info(adev->dev, "Fetched VBIOS from VRAM BAR\n");
+		goto success;
+	}
+
+	if (amdgpu_read_bios(adev)) {
+		dev_info(adev->dev, "Fetched VBIOS from ROM BAR\n");
+		goto success;
+	}
+
+	if (amdgpu_read_bios_from_rom(adev)) {
+		dev_info(adev->dev, "Fetched VBIOS from ROM\n");
+		goto success;
+	}
+
+	if (amdgpu_read_disabled_bios(adev)) {
+		dev_info(adev->dev, "Fetched VBIOS from disabled ROM BAR\n");
+		goto success;
+	}
+
+	if (amdgpu_read_platform_bios(adev)) {
+		dev_info(adev->dev, "Fetched VBIOS from platform\n");
+		goto success;
+	}
+
+	DRM_ERROR("Unable to locate a BIOS ROM\n");
+	return false;
+
+success:
+	adev->is_atom_fw = (adev->asic_type >= CHIP_VEGA10) ? true : false;
+	return true;
+}