--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Writing IntelGraphicsMem table for ACPI
+ *
+ * Copyright 2019 Google LLC
+ * Modified from coreboot src/soc/intel/gma/opregion.c
+ */
+
+#include <common.h>
+#include <binman.h>
+#include <bloblist.h>
+#include <dm.h>
+#include <spi_flash.h>
+#include <asm/intel_opregion.h>
+
+static char vbt_data[8 << 10];
+
+static int locate_vbt(char **vbtp, int *sizep)
+{
+ struct binman_entry vbt;
+ struct udevice *dev;
+ u32 vbtsig = 0;
+ int size;
+ int ret;
+
+ ret = binman_entry_find("intel-vbt", &vbt);
+ if (ret)
+ return log_msg_ret("find VBT", ret);
+ ret = uclass_first_device_err(UCLASS_SPI_FLASH, &dev);
+ if (ret)
+ return log_msg_ret("find flash", ret);
+ size = vbt.size;
+ if (size > sizeof(vbt_data))
+ return log_msg_ret("vbt", -E2BIG);
+ ret = spi_flash_read_dm(dev, vbt.image_pos, size, vbt_data);
+ if (ret)
+ return log_msg_ret("read", ret);
+
+ memcpy(&vbtsig, vbt_data, sizeof(vbtsig));
+ if (vbtsig != VBT_SIGNATURE) {
+ log_err("Missing/invalid signature in VBT data file!\n");
+ return -EINVAL;
+ }
+
+ log_info("Found a VBT of %u bytes\n", size);
+ *sizep = size;
+ *vbtp = vbt_data;
+
+ return 0;
+}
+
+/* Write ASLS PCI register and prepare SWSCI register */
+static int intel_gma_opregion_register(struct udevice *dev, ulong opregion)
+{
+ int sci_reg;
+
+ if (!device_active(dev))
+ return -ENOENT;
+
+ /*
+ * Intel BIOS Specification
+ * Chapter 5.3.7 "Initialise Hardware State"
+ */
+ dm_pci_write_config32(dev, ASLS, opregion);
+
+ /*
+ * Atom-based platforms use a combined SMI/SCI register,
+ * whereas non-Atom platforms use a separate SCI register
+ */
+ if (IS_ENABLED(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"
+ */
+ dm_pci_clrset_config16(dev, sci_reg, GSSCIE, SMISCISEL);
+
+ return 0;
+}
+
+int intel_gma_init_igd_opregion(struct udevice *dev,
+ struct igd_opregion *opregion)
+{
+ struct optionrom_vbt *vbt = NULL;
+ char *vbt_buf;
+ int vbt_size;
+ int ret;
+
+ ret = locate_vbt(&vbt_buf, &vbt_size);
+ if (ret) {
+ log_err("GMA: VBT couldn't be found\n");
+ return log_msg_ret("find vbt", ret);
+ }
+ vbt = (struct optionrom_vbt *)vbt_buf;
+
+ memset(opregion, '\0', sizeof(struct igd_opregion));
+
+ 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)) {
+ struct optionrom_vbt *ext_vbt;
+
+ ret = bloblist_ensure_size(BLOBLISTT_INTEL_VBT,
+ vbt->hdr_vbt_size,
+ (void **)&ext_vbt);
+ if (ret) {
+ log_err("GMA: Unable to add Ext VBT to bloblist\n");
+ return log_msg_ret("blob", ret);
+ }
+
+ 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 */
+ printf("copy to %p\n", opregion->vbt.gvd1);
+ memcpy(opregion->vbt.gvd1, vbt, vbt->hdr_vbt_size);
+ }
+
+ /* 8kb */
+ opregion->header.size = sizeof(struct igd_opregion) / 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.
+ *
+ * No adverse effects when using VBIOS or booting Linux.
+ */
+ opregion->header.version = IGD_OPREGION_VERSION << 24;
+
+ /* We just assume we're mobile for now */
+ opregion->header.mailboxes = MAILBOXES_MOBILE;
+
+ /* Initialise Mailbox 1 */
+ opregion->mailbox1.clid = 1;
+
+ /* Initialise 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 */
+ ret = intel_gma_opregion_register(dev, (ulong)opregion);
+ if (ret)
+ return log_msg_ret("write asls", ret);
+
+ return 0;
+}
--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Writing IntelGraphicsMem table for ACPI
+ *
+ * Copyright 2019 Google LLC
+ * Modified from coreboot src/soc/intel/gma/opregion.h
+ */
+
+#ifndef _ASM_INTEL_OPREGION_H_
+#define _ASM_INTEL_OPREGION_H_
+
+#define VBT_SIGNATURE 0x54425624
+
+/* IGD PCI Configuration register */
+#define ASLS 0xfc /* OpRegion Base */
+#define SWSCI 0xe8 /* SWSCI Register */
+#define SWSMISCI 0xe0 /* SWSMISCI Register */
+#define GSSCIE BIT(0) /* SCI Event trigger */
+#define SMISCISEL BIT(15) /* Select SMI or SCI event source */
+
+/* mailbox 0: header */
+struct __packed opregion_header {
+ u8 signature[16]; /* Offset 0 OpRegion signature */
+ u32 size; /* Offset 16 OpRegion size */
+ u32 version; /* Offset 20 OpRegion structure version */
+ u8 sbios_version[32]; /* Offset 24 System BIOS build version */
+ u8 vbios_version[16]; /* Offset 56 Video BIOS build version */
+ u8 driver_version[16]; /* Offset 72 Graphic drvr build version */
+ u32 mailboxes; /* Offset 88 Mailboxes supported */
+ u32 dmod; /* Offset 92 Driver Model */
+ u32 pcon; /* Offset 96 Platform Capabilities */
+ u16 dver[16]; /* Offset 100 GOP Version */
+ u8 reserved[124]; /* Offset 132 Reserved */
+};
+
+#define IGD_OPREGION_SIGNATURE "IntelGraphicsMem"
+#define IGD_OPREGION_VERSION 2
+
+#define IGD_MBOX1 BIT(0)
+#define IGD_MBOX2 BIT(1)
+#define IGD_MBOX3 BIT(2)
+#define IGD_MBOX4 BIT(3)
+#define IGD_MBOX5 BIT(4)
+
+#define MAILBOXES_MOBILE (IGD_MBOX1 | IGD_MBOX2 | IGD_MBOX3 | \
+ IGD_MBOX4 | IGD_MBOX5)
+#define MAILBOXES_DESKTOP (IGD_MBOX2 | IGD_MBOX4)
+
+#define SBIOS_VERSION_SIZE 32
+
+/* mailbox 1: public ACPI methods */
+struct __packed opregion_mailbox1 {
+ u32 drdy; /* Offset 0 Driver readiness */
+ u32 csts; /* Offset 4 Status */
+ u32 cevt; /* Offset 8 Current event */
+ u8 reserved[20]; /* Offset 12 Reserved */
+ u32 didl; /* Offset 32 Supported display device 1 */
+ u32 ddl2; /* Offset 36 Supported display device 2 */
+ u32 ddl3; /* Offset 40 Supported display device 3 */
+ u32 ddl4; /* Offset 44 Supported display device 4 */
+ u32 ddl5; /* Offset 48 Supported display device 5 */
+ u32 ddl6; /* Offset 52 Supported display device 6 */
+ u32 ddl7; /* Offset 56 Supported display device 7 */
+ u32 ddl8; /* Offset 60 Supported display device 8 */
+ u32 cpdl; /* Offset 64 Currently present display device 1 */
+ u32 cpl2; /* Offset 68 Currently present display device 2 */
+ u32 cpl3; /* Offset 72 Currently present display device 3 */
+ u32 cpl4; /* Offset 76 Currently present display device 4 */
+ u32 cpl5; /* Offset 80 Currently present display device 5 */
+ u32 cpl6; /* Offset 84 Currently present display device 6 */
+ u32 cpl7; /* Offset 88 Currently present display device 7 */
+ u32 cpl8; /* Offset 92 Currently present display device 8 */
+ u32 cadl; /* Offset 96 Currently active display device 1 */
+ u32 cal2; /* Offset 100 Currently active display device 2 */
+ u32 cal3; /* Offset 104 Currently active display device 3 */
+ u32 cal4; /* Offset 108 Currently active display device 4 */
+ u32 cal5; /* Offset 112 Currently active display device 5 */
+ u32 cal6; /* Offset 116 Currently active display device 6 */
+ u32 cal7; /* Offset 120 Currently active display device 7 */
+ u32 cal8; /* Offset 124 Currently active display device 8 */
+ u32 nadl; /* Offset 128 Next active device 1 */
+ u32 ndl2; /* Offset 132 Next active device 2 */
+ u32 ndl3; /* Offset 136 Next active device 3 */
+ u32 ndl4; /* Offset 140 Next active device 4 */
+ u32 ndl5; /* Offset 144 Next active device 5 */
+ u32 ndl6; /* Offset 148 Next active device 6 */
+ u32 ndl7; /* Offset 152 Next active device 7 */
+ u32 ndl8; /* Offset 156 Next active device 8 */
+ u32 aslp; /* Offset 160 ASL sleep timeout */
+ u32 tidx; /* Offset 164 Toggle table index */
+ u32 chpd; /* Offset 168 Current hot plug enable indicator */
+ u32 clid; /* Offset 172 Current lid state indicator */
+ u32 cdck; /* Offset 176 Current docking state indicator */
+ u32 sxsw; /* Offset 180 Display Switch notification on Sx State
+ * resume
+ */
+ u32 evts; /* Offset 184 Events supported by ASL */
+ u32 cnot; /* Offset 188 Current OS Notification */
+ u32 nrdy; /* Offset 192 Reasons for DRDY = 0 */
+ u32 ddl9; /* Offset 196 Extended Supported display device 1 */
+ u32 dd10; /* Offset 200 Extended Supported display device 2 */
+ u32 dd11; /* Offset 204 Extended Supported display device 3 */
+ u32 dd12; /* Offset 208 Extended Supported display device 4 */
+ u32 dd13; /* Offset 212 Extended Supported display device 5 */
+ u32 dd14; /* Offset 216 Extended Supported display device 6 */
+ u32 dd15; /* Offset 220 Extended Supported display device 7 */
+ u32 cpl9; /* Offset 224 Extended Currently present device 1 */
+ u32 cp10; /* Offset 228 Extended Currently present device 2 */
+ u32 cp11; /* Offset 232 Extended Currently present device 3 */
+ u32 cp12; /* Offset 236 Extended Currently present device 4 */
+ u32 cp13; /* Offset 240 Extended Currently present device 5 */
+ u32 cp14; /* Offset 244 Extended Currently present device 6 */
+ u32 cp15; /* Offset 248 Extended Currently present device 7 */
+ u8 reserved2[4]; /* Offset 252 Reserved 4 bytes */
+};
+
+/* mailbox 2: software sci interface */
+struct __packed opregion_mailbox2 {
+ u32 scic; /* Offset 0 Software SCI function number parameters */
+ u32 parm; /* Offset 4 Software SCI function number parameters */
+ u32 dslp; /* Offset 8 Driver sleep timeout */
+ u8 reserved[244]; /* Offset 12 Reserved */
+};
+
+/* mailbox 3: power conservation */
+struct __packed opregion_mailbox3 {
+ u32 ardy; /* Offset 0 Driver readiness */
+ u32 aslc; /* Offset 4 ASLE interrupt command / status */
+ u32 tche; /* Offset 8 Technology enabled indicator */
+ u32 alsi; /* Offset 12 Current ALS illuminance reading */
+ u32 bclp; /* Offset 16 Backlight britness to set */
+ u32 pfit; /* Offset 20 Panel fitting Request */
+ u32 cblv; /* Offset 24 Brightness Current State */
+ /* Offset 28 Backlight Brightness Level Duty Cycle Mapping Table */
+ u16 bclm[20];
+ u32 cpfm; /* Offset 68 Panel Fitting Current Mode */
+ u32 epfm; /* Offset 72 Enabled Panel Fitting Modes */
+ u8 plut[74]; /* Offset 76 Panel Look Up Table */
+ /* Offset 150 PWM Frequency and Minimum Brightness */
+ u32 pfmb;
+ u32 ccdv; /* Offset 154 Color Correction Default Values */
+ u32 pcft; /* Offset 158 Power Conservation Features */
+ u32 srot; /* Offset 162 Supported Rotation angle */
+ u32 iuer; /* Offset 166 Intel Ultrabook Event Register */
+ u64 fdsp; /* Offset 170 FFS Display Physical address */
+ u32 fdss; /* Offset 178 FFS Display Size */
+ u32 stat; /* Offset 182 State Indicator */
+ /*
+ * Offset 186 (Igd opregion offset 0x3BAh)
+ * Physical address of Raw VBT data
+ */
+ u64 rvda;
+ /* Offset 194 (Igd opregion offset 0x3C2h) Size of Raw VBT data */
+ u32 rvds;
+ u8 reserved[58]; /* Offset 198 Reserved */
+};
+
+#define IGD_BACKLIGHT_BRIGHTNESS 0xff
+#define IGD_INITIAL_BRIGHTNESS 0x64
+
+#define IGD_FIELD_VALID BIT(31)
+#define IGD_WORD_FIELD_VALID BIT(15)
+#define IGD_PFIT_STRETCH 6
+
+/* mailbox 4: vbt */
+struct __packed opregion_vbt {
+ u8 gvd1[6 << 10];
+};
+
+/* Mailbox 5: BIOS to Driver Notification Extension */
+struct __packed opregion_mailbox5 {
+ u32 phed; /* Offset 7168 Panel Header */
+ u8 bddc[256]; /* Offset 7172 Panel EDID */
+ u8 reserved[764]; /* Offset 7428 764 bytes */
+};
+
+/* IGD OpRegion */
+struct __packed igd_opregion {
+ struct opregion_header header;
+ struct opregion_mailbox1 mailbox1;
+ struct opregion_mailbox2 mailbox2;
+ struct opregion_mailbox3 mailbox3;
+ struct opregion_vbt vbt;
+ struct opregion_mailbox5 mailbox5;
+};
+
+/* Intel Video BIOS (Option ROM) */
+struct __packed optionrom_header {
+ u16 signature;
+ u8 size;
+ u8 reserved[21];
+ u16 pcir_offset;
+ u16 vbt_offset;
+};
+
+#define OPROM_SIGNATURE 0xaa55
+
+struct __packed optionrom_pcir {
+ u32 signature;
+ u16 vendor;
+ u16 device;
+ u16 reserved1;
+ u16 length;
+ u8 revision;
+ u8 classcode[3];
+ u16 imagelength;
+ u16 coderevision;
+ u8 codetype;
+ u8 indicator;
+ u16 reserved2;
+};
+
+struct __packed optionrom_vbt {
+ u8 hdr_signature[20];
+ u16 hdr_version;
+ u16 hdr_size;
+ u16 hdr_vbt_size;
+ u8 hdr_vbt_checksum;
+ u8 hdr_reserved;
+ u32 hdr_vbt_datablock;
+ u32 hdr_aim[4];
+ u8 datahdr_signature[16];
+ u16 datahdr_version;
+ u16 datahdr_size;
+ u16 datahdr_datablocksize;
+ u8 coreblock_id;
+ u16 coreblock_size;
+ u16 coreblock_biossize;
+ u8 coreblock_biostype;
+ u8 coreblock_releasestatus;
+ u8 coreblock_hwsupported;
+ u8 coreblock_integratedhw;
+ u8 coreblock_biosbuild[4];
+ u8 coreblock_biossignon[155];
+};
+
+/**
+ * intel_gma_init_igd_opregion() - Initialise IGD OpRegion
+ *
+ * This is called from ACPI code and OS drivers
+ *
+ * @return 0 if OK, -ve on error
+ */
+int intel_gma_init_igd_opregion(struct udevice *dev,
+ struct igd_opregion *opregion);
+
+#endif /* _ASM_INTEL_OPREGION_H_ */
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