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/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/pci_ops.h>
#include <device/device.h>
#include <string.h>
#include <device/pci.h>
#include <drivers/intel/gma/opregion.h>
#include "i915.h"
#include "intel_bios.h"
static size_t generate_vbt(const struct i915_gpu_controller_info *const conf,
struct vbt_header *const head,
const char *const idstr)
{
u8 *ptr;
memset(head, 0, sizeof(*head));
memset(head->signature, ' ', sizeof(head->signature));
memcpy(head->signature, idstr,
MIN(strlen(idstr), sizeof(head->signature)));
head->version = 100;
head->header_size = sizeof(*head);
head->bdb_offset = sizeof(*head);
struct bdb_header *const bdb_head = (struct bdb_header *)(head + 1);
memset(bdb_head, 0, sizeof(*bdb_head));
memcpy(bdb_head->signature, "BIOS_DATA_BLOCK ", 16);
bdb_head->version = 0xa8;
bdb_head->header_size = sizeof(*bdb_head);
ptr = (u8 *)(bdb_head + 1);
ptr[0] = BDB_GENERAL_FEATURES;
ptr[1] = sizeof(struct bdb_general_features);
ptr[2] = sizeof(struct bdb_general_features) >> 8;
ptr += 3;
struct bdb_general_features *const genfeat =
(struct bdb_general_features *)ptr;
memset(genfeat, 0, sizeof(*genfeat));
genfeat->panel_fitting = 3;
genfeat->flexaim = 1;
genfeat->download_ext_vbt = 1;
genfeat->enable_ssc = conf->use_spread_spectrum_clock;
genfeat->ssc_freq = CONFIG(INTEL_GMA_SSC_ALTERNATE_REF);
genfeat->rsvd10 = 0x4;
genfeat->legacy_monitor_detect = 1;
genfeat->int_crt_support = 1;
genfeat->dp_ssc_enb = 1;
ptr += sizeof(*genfeat);
bdb_head->bdb_size = ptr - (u8 *)bdb_head;
head->vbt_size = ptr - (u8 *)head;
head->vbt_checksum = 0;
return ptr - (u8 *)head;
}
void
generate_fake_intel_oprom(const struct i915_gpu_controller_info *const conf,
struct device *const dev, const char *const idstr)
{
optionrom_header_t *const oh = (void *)PCI_VGA_RAM_IMAGE_START;
memset(oh, 0, 8192);
oh->signature = PCI_ROM_HDR;
oh->pcir_offset = 0x40;
oh->vbt_offset = 0x80;
optionrom_pcir_t *const pcir = (void *)((u8 *)oh + oh->pcir_offset);
pcir->signature = 0x52494350; // PCIR
pcir->vendor = dev->vendor;
pcir->device = dev->device;
pcir->length = sizeof(*pcir);
pcir->revision = pci_read_config8(dev, PCI_CLASS_REVISION);
pcir->classcode[0] = dev->class;
pcir->classcode[1] = dev->class >> 8;
pcir->classcode[2] = dev->class >> 16;
pcir->indicator = 0x80;
const size_t vbt_size =
generate_vbt(conf, (void *)((u8 *)oh + oh->vbt_offset), idstr);
const size_t fake_oprom_size =
DIV_ROUND_UP(oh->vbt_offset + vbt_size, 512);
oh->size = fake_oprom_size;
pcir->imagelength = fake_oprom_size;
}
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