/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include #include #include #include #include "intel_bios.h" #include "opregion.h" __weak const char *mainboard_vbt_filename(void) { return "vbt.bin"; } static char vbt_data[CONFIG_VBT_DATA_SIZE_KB * KiB]; static size_t vbt_data_sz; void *locate_vbt(size_t *vbt_size) { uint32_t vbtsig = 0; if (vbt_data_sz != 0) { if (vbt_size) *vbt_size = vbt_data_sz; return (void *)vbt_data; } const char *filename = mainboard_vbt_filename(); size_t file_size = cbfs_load(filename, vbt_data, sizeof(vbt_data)); if (file_size == 0) return NULL; if (vbt_size) *vbt_size = file_size; memcpy(&vbtsig, vbt_data, sizeof(vbtsig)); if (vbtsig != VBT_SIGNATURE) { printk(BIOS_ERR, "Missing/invalid signature in VBT data file!\n"); return NULL; } printk(BIOS_INFO, "Found a VBT of %zu bytes after decompression\n", file_size); vbt_data_sz = file_size; return (void *)vbt_data; } /* Write ASLS PCI register and prepare SWSCI register. */ static void intel_gma_opregion_register(uintptr_t opregion) { struct device *igd; u16 reg16; u16 sci_reg; igd = pcidev_on_root(0x2, 0); if (!igd || !igd->enabled) return; /* * Intel BIOS Specification * Chapter 5.3.7 "Initialize Hardware State" */ pci_write_config32(igd, ASLS, opregion); /* * Atom-based platforms use a combined SMI/SCI register, * whereas non-Atom platforms use a separate SCI register. */ if (CONFIG(INTEL_GMA_SWSMISCI)) sci_reg = SWSMISCI; else sci_reg = SWSCI; /* * Intel's Windows driver relies on this: * Intel BIOS Specification * Chapter 5.4 "ASL Software SCI Handler" */ reg16 = pci_read_config16(igd, sci_reg); reg16 &= ~GSSCIE; reg16 |= SMISCISEL; pci_write_config16(igd, sci_reg, reg16); } /* Restore ASLS register on S3 resume and prepare SWSCI. */ static enum cb_err intel_gma_restore_opregion(void) { const igd_opregion_t *const opregion = cbmem_find(CBMEM_ID_IGD_OPREGION); if (!opregion) { printk(BIOS_ERR, "GMA: Failed to find IGD OpRegion.\n"); return CB_ERR; } /* Write ASLS PCI register and prepare SWSCI register. */ intel_gma_opregion_register((uintptr_t)opregion); return CB_SUCCESS; } static enum cb_err vbt_validate(struct region_device *rdev) { uint32_t sig; if (rdev_readat(rdev, &sig, 0, sizeof(sig)) != sizeof(sig)) return CB_ERR; if (sig != VBT_SIGNATURE) return CB_ERR; return CB_SUCCESS; } static enum cb_err locate_vbt_vbios(const u8 *vbios, struct region_device *rdev) { const optionrom_header_t *oprom; const optionrom_pcir_t *pcir; struct region_device rd; enum cb_err ret; u8 opromsize; size_t offset; // FIXME: caller should supply a region_device instead of vbios pointer if (rdev_chain(&rd, &addrspace_32bit.rdev, (uintptr_t)vbios, sizeof(*oprom))) return CB_ERR; if (rdev_readat(&rd, &opromsize, offsetof(optionrom_header_t, size), sizeof(opromsize)) != sizeof(opromsize) || !opromsize) return CB_ERR; if (rdev_chain(&rd, &addrspace_32bit.rdev, (uintptr_t)vbios, opromsize * 512)) return CB_ERR; oprom = rdev_mmap(&rd, 0, sizeof(*oprom)); if (!oprom) return CB_ERR; if (!oprom->pcir_offset || !oprom->vbt_offset) { rdev_munmap(&rd, (void *)oprom); return CB_ERR; } pcir = rdev_mmap(&rd, oprom->pcir_offset, sizeof(*pcir)); if (pcir == NULL) { rdev_munmap(&rd, (void *)oprom); return CB_ERR; } printk(BIOS_DEBUG, "GMA: locate_vbt_vbios: %x %x %x %x %x\n", oprom->signature, pcir->vendor, pcir->classcode[0], pcir->classcode[1], pcir->classcode[2]); /* Make sure we got an Intel VGA option rom */ if ((oprom->signature != OPROM_SIGNATURE) || (pcir->vendor != PCI_VENDOR_ID_INTEL) || (pcir->signature != 0x52494350) || (pcir->classcode[0] != 0x00) || (pcir->classcode[1] != 0x00) || (pcir->classcode[2] != 0x03)) { rdev_munmap(&rd, (void *)oprom); rdev_munmap(&rd, (void *)pcir); return CB_ERR; } rdev_munmap(&rd, (void *)pcir); /* Search for $VBT as some VBIOS are broken... */ offset = oprom->vbt_offset; do { ret = rdev_chain(rdev, &rd, offset, (opromsize * 512) - offset); offset++; } while (ret == CB_SUCCESS && vbt_validate(rdev) != CB_SUCCESS); offset--; if (ret == CB_SUCCESS && offset != oprom->vbt_offset) printk(BIOS_WARNING, "GMA: Buggy VBIOS found\n"); else if (ret != CB_SUCCESS) printk(BIOS_ERR, "GMA: Broken VBIOS found\n"); rdev_munmap(&rd, (void *)oprom); return ret; } static enum cb_err locate_vbt_cbfs(struct region_device *rdev) { size_t vbt_data_size; void *vbt = locate_vbt(&vbt_data_size); if (vbt == NULL) return CB_ERR; if (rdev_chain(rdev, &addrspace_32bit.rdev, (uintptr_t)vbt, vbt_data_size)) return CB_ERR; printk(BIOS_INFO, "GMA: Found VBT in CBFS\n"); return CB_SUCCESS; } static enum cb_err locate_vbt_vbios_cbfs(struct region_device *rdev) { const u8 *oprom = (const u8 *)pci_rom_probe(pcidev_on_root(0x2, 0)); if (oprom == NULL) return CB_ERR; printk(BIOS_INFO, "GMA: Found VBIOS in CBFS\n"); return locate_vbt_vbios(oprom, rdev); } /* Initialize IGD OpRegion, called from ACPI code and OS drivers */ enum cb_err intel_gma_init_igd_opregion(void) { igd_opregion_t *opregion; struct region_device rdev; optionrom_vbt_t *vbt = NULL; optionrom_vbt_t *ext_vbt; bool found = false; if (acpi_is_wakeup_s3()) return intel_gma_restore_opregion(); /* Search for vbt.bin in CBFS. */ if (locate_vbt_cbfs(&rdev) == CB_SUCCESS && vbt_validate(&rdev) == CB_SUCCESS) { found = true; printk(BIOS_INFO, "GMA: Found valid VBT in CBFS\n"); } /* Search for pci8086,XXXX.rom in CBFS. */ else if (locate_vbt_vbios_cbfs(&rdev) == CB_SUCCESS && vbt_validate(&rdev) == CB_SUCCESS) { found = true; printk(BIOS_INFO, "GMA: Found valid VBT in VBIOS\n"); } /* * Try to locate Intel VBIOS at 0xc0000. It might have been placed by * Native Graphics Init as fake Option ROM or when coreboot did run the * VBIOS on legacy platforms. * TODO: Place generated fake VBT in CBMEM and get rid of this. */ else if (locate_vbt_vbios((u8 *)0xc0000, &rdev) == CB_SUCCESS && vbt_validate(&rdev) == CB_SUCCESS) { found = true; printk(BIOS_INFO, "GMA: Found valid VBT in legacy area\n"); } if (!found) { printk(BIOS_ERR, "GMA: VBT couldn't be found\n"); return CB_ERR; } vbt = rdev_mmap_full(&rdev); if (!vbt) { printk(BIOS_ERR, "GMA: Error mapping VBT\n"); return CB_ERR; } if (vbt->hdr_vbt_size > region_device_sz(&rdev)) { printk(BIOS_ERR, "GMA: Error mapped only a partial VBT\n"); rdev_munmap(&rdev, vbt); return CB_ERR; } opregion = cbmem_add(CBMEM_ID_IGD_OPREGION, sizeof(*opregion)); if (!opregion) { printk(BIOS_ERR, "GMA: Failed to add IGD OpRegion to CBMEM.\n"); return CB_ERR; } memset(opregion, 0, sizeof(igd_opregion_t)); memcpy(&opregion->header.signature, IGD_OPREGION_SIGNATURE, sizeof(opregion->header.signature)); memcpy(opregion->header.vbios_version, vbt->coreblock_biosbuild, ARRAY_SIZE(vbt->coreblock_biosbuild)); /* Extended VBT support */ if (vbt->hdr_vbt_size > sizeof(opregion->vbt.gvd1)) { ext_vbt = cbmem_add(CBMEM_ID_EXT_VBT, vbt->hdr_vbt_size); if (ext_vbt == NULL) { printk(BIOS_ERR, "GMA: Unable to add Ext VBT to cbmem!\n"); rdev_munmap(&rdev, vbt); return CB_ERR; } memcpy(ext_vbt, vbt, vbt->hdr_vbt_size); opregion->mailbox3.rvda = (uintptr_t)ext_vbt; opregion->mailbox3.rvds = vbt->hdr_vbt_size; } else { /* Raw VBT size which can fit in gvd1 */ memcpy(opregion->vbt.gvd1, vbt, vbt->hdr_vbt_size); } rdev_munmap(&rdev, vbt); /* 8kb */ opregion->header.size = sizeof(igd_opregion_t) / 1024; /* * Left-shift version field to accommodate Intel Windows driver quirk * when not using a VBIOS. * Required for Legacy boot + NGI, UEFI + NGI, and UEFI + GOP driver. * * Tested on: (platform, GPU, windows driver version) * samsung/stumpy (SNB, GT2, 9.17.10.4459) * google/link (IVB, GT2, 15.33.4653) * google/wolf (HSW, GT1, 15.40.36.4703) * google/panther (HSW, GT2, 15.40.36.4703) * google/rikku (BDW, GT1, 15.40.36.4703) * google/lulu (BDW, GT2, 15.40.36.4703) * google/chell (SKL-Y, GT2, 15.45.21.4821) * google/sentry (SKL-U, GT1, 15.45.21.4821) * purism/librem13v2 (SKL-U, GT2, 15.45.21.4821) * * No adverse effects when using VBIOS or booting Linux. */ opregion->header.version = IGD_OPREGION_VERSION << 24; // FIXME We just assume we're mobile for now opregion->header.mailboxes = MAILBOXES_MOBILE; // TODO Initialize Mailbox 1 opregion->mailbox1.clid = 1; // TODO Initialize Mailbox 3 opregion->mailbox3.bclp = IGD_BACKLIGHT_BRIGHTNESS; opregion->mailbox3.pfit = IGD_FIELD_VALID | IGD_PFIT_STRETCH; opregion->mailbox3.pcft = 0; // should be (IMON << 1) & 0x3e opregion->mailbox3.cblv = IGD_FIELD_VALID | IGD_INITIAL_BRIGHTNESS; opregion->mailbox3.bclm[0] = IGD_WORD_FIELD_VALID + 0x0000; opregion->mailbox3.bclm[1] = IGD_WORD_FIELD_VALID + 0x0a19; opregion->mailbox3.bclm[2] = IGD_WORD_FIELD_VALID + 0x1433; opregion->mailbox3.bclm[3] = IGD_WORD_FIELD_VALID + 0x1e4c; opregion->mailbox3.bclm[4] = IGD_WORD_FIELD_VALID + 0x2866; opregion->mailbox3.bclm[5] = IGD_WORD_FIELD_VALID + 0x327f; opregion->mailbox3.bclm[6] = IGD_WORD_FIELD_VALID + 0x3c99; opregion->mailbox3.bclm[7] = IGD_WORD_FIELD_VALID + 0x46b2; opregion->mailbox3.bclm[8] = IGD_WORD_FIELD_VALID + 0x50cc; opregion->mailbox3.bclm[9] = IGD_WORD_FIELD_VALID + 0x5ae5; opregion->mailbox3.bclm[10] = IGD_WORD_FIELD_VALID + 0x64ff; /* Write ASLS PCI register and prepare SWSCI register. */ intel_gma_opregion_register((uintptr_t)opregion); return CB_SUCCESS; }