1 files changed, 363 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 000000000000..ceb444f6d418
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
@@ -0,0 +1,363 @@
+/*
+ * 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 <drm/drmP.h>
+#include "amdgpu.h"
+#include "atom.h"
+
+#include <linux/vga_switcheroo.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+/*
+ * BIOS.
+ */
+
+/* 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 & AMDGPU_IS_APU))
+                if (!amdgpu_card_posted(adev))
+                        return false;
+
+        adev->bios = NULL;
+        vram_base = pci_resource_start(adev->pdev, 0);
+        bios = ioremap(vram_base, size);
+        if (!bios) {
+                return false;
+        }
+
+        if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
+                iounmap(bios);
+                return false;
+        }
+        adev->bios = kmalloc(size, GFP_KERNEL);
+        if (adev->bios == NULL) {
+                iounmap(bios);
+                return false;
+        }
+        memcpy_fromio(adev->bios, bios, size);
+        iounmap(bios);
+        return true;
+}
+
+bool amdgpu_read_bios(struct amdgpu_device *adev)
+{
+        uint8_t __iomem *bios, val1, val2;
+        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;
+        }
+
+        val1 = readb(&bios[0]);
+        val2 = readb(&bios[1]);
+
+        if (size == 0 || val1 != 0x55 || val2 != 0xaa) {
+                pci_unmap_rom(adev->pdev, bios);
+                return false;
+        }
+        adev->bios = kzalloc(size, GFP_KERNEL);
+        if (adev->bios == NULL) {
+                pci_unmap_rom(adev->pdev, bios);
+                return false;
+        }
+        memcpy_fromio(adev->bios, bios, size);
+        pci_unmap_rom(adev->pdev, bios);
+        return true;
+}
+
+static bool amdgpu_read_platform_bios(struct amdgpu_device *adev)
+{
+        uint8_t __iomem *bios;
+        size_t size;
+
+        adev->bios = NULL;
+
+        bios = pci_platform_rom(adev->pdev, &size);
+        if (!bios) {
+                return false;
+        }
+
+        if (size == 0 || bios[0] != 0x55 || bios[1] != 0xaa) {
+                return false;
+        }
+        adev->bios = kmemdup(bios, size, GFP_KERNEL);
+        if (adev->bios == NULL) {
+                return false;
+        }
+
+        return true;
+}
+
+#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 & AMDGPU_IS_APU)
+                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;
+
+        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 (i == 0 || adev->bios[0] != 0x55 || adev->bios[1] != 0xaa) {
+                kfree(adev->bios);
+                return false;
+        }
+        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 & AMDGPU_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)
+{
+        bool ret = false;
+        struct acpi_table_header *hdr;
+        acpi_size tbl_size;
+        UEFI_ACPI_VFCT *vfct;
+        GOP_VBIOS_CONTENT *vbios;
+        VFCT_IMAGE_HEADER *vhdr;
+
+        if (!ACPI_SUCCESS(acpi_get_table_with_size("VFCT", 1, &hdr, &tbl_size)))
+                return false;
+        if (tbl_size < sizeof(UEFI_ACPI_VFCT)) {
+                DRM_ERROR("ACPI VFCT table present but broken (too short #1)\n");
+                goto out_unmap;
+        }
+
+        vfct = (UEFI_ACPI_VFCT *)hdr;
+        if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) > tbl_size) {
+                DRM_ERROR("ACPI VFCT table present but broken (too short #2)\n");
+                goto out_unmap;
+        }
+
+        vbios = (GOP_VBIOS_CONTENT *)((char *)hdr + vfct->VBIOSImageOffset);
+        vhdr = &vbios->VbiosHeader;
+        DRM_INFO("ACPI VFCT contains a BIOS for %02x:%02x.%d %04x:%04x, size %d\n",
+                        vhdr->PCIBus, vhdr->PCIDevice, vhdr->PCIFunction,
+                        vhdr->VendorID, vhdr->DeviceID, vhdr->ImageLength);
+
+        if (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) {
+                DRM_INFO("ACPI VFCT table is not for this card\n");
+                goto out_unmap;
+        }
+
+        if (vfct->VBIOSImageOffset + sizeof(VFCT_IMAGE_HEADER) + vhdr->ImageLength > tbl_size) {
+                DRM_ERROR("ACPI VFCT image truncated\n");
+                goto out_unmap;
+        }
+
+        adev->bios = kmemdup(&vbios->VbiosContent, vhdr->ImageLength, GFP_KERNEL);
+        ret = !!adev->bios;
+
+out_unmap:
+        return ret;
+}
+#else
+static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
+{
+        return false;
+}
+#endif
+
+bool amdgpu_get_bios(struct amdgpu_device *adev)
+{
+        bool r;
+        uint16_t tmp;
+
+        r = amdgpu_atrm_get_bios(adev);
+        if (r == false)
+                r = amdgpu_acpi_vfct_bios(adev);
+        if (r == false)
+                r = igp_read_bios_from_vram(adev);
+        if (r == false)
+                r = amdgpu_read_bios(adev);
+        if (r == false) {
+                r = amdgpu_read_disabled_bios(adev);
+        }
+        if (r == false) {
+                r = amdgpu_read_platform_bios(adev);
+        }
+        if (r == false || adev->bios == NULL) {
+                DRM_ERROR("Unable to locate a BIOS ROM\n");
+                adev->bios = NULL;
+                return false;
+        }
+        if (adev->bios[0] != 0x55 || adev->bios[1] != 0xaa) {
+                printk("BIOS signature incorrect %x %x\n", adev->bios[0], adev->bios[1]);
+                goto free_bios;
+        }
+
+        tmp = RBIOS16(0x18);
+        if (RBIOS8(tmp + 0x14) != 0x0) {
+                DRM_INFO("Not an x86 BIOS ROM, not using.\n");
+                goto free_bios;
+        }
+
+        adev->bios_header_start = RBIOS16(0x48);
+        if (!adev->bios_header_start) {
+                goto free_bios;
+        }
+        tmp = adev->bios_header_start + 4;
+        if (!memcmp(adev->bios + tmp, "ATOM", 4) ||
+            !memcmp(adev->bios + tmp, "MOTA", 4)) {
+                adev->is_atom_bios = true;
+        } else {
+                adev->is_atom_bios = false;
+        }
+
+        DRM_DEBUG("%sBIOS detected\n", adev->is_atom_bios ? "ATOM" : "COM");
+        return true;
+free_bios:
+        kfree(adev->bios);
+        adev->bios = NULL;
+        return false;
+}