/* SPDX-License-Identifier: GPL-2.0-only */

#include <types.h>
#include <console/console.h>
#include <commonlib/helpers.h>
#include <acpi/acpi.h>
#include <arch/ioapic.h>
#include <device/device.h>
#include <device/pci_ops.h>
#include "sandybridge.h"
#include <southbridge/intel/bd82x6x/pch.h>

static unsigned long acpi_create_igfx_rmrr(const unsigned long current)
{
	const u32 base_mask = ~(u32)(MiB - 1);

	struct device *const host = pcidev_on_root(0, 0);
	if (!host)
		return 0;

	const u32 bgsm  = pci_read_config32(host,  BGSM) & base_mask;
	const u32 tolud = pci_read_config32(host, TOLUD) & base_mask;
	if (!bgsm || !tolud)
		return 0;

	return acpi_create_dmar_rmrr(current, 0, bgsm, tolud - 1);
}

static unsigned long acpi_fill_dmar(unsigned long current)
{
	const struct device *const igfx = pcidev_on_root(2, 0);

	/* First, add DRHD entries */
	if (igfx && igfx->enabled) {
		const unsigned long tmp = current;

		current += acpi_create_dmar_drhd_4k(current, 0, 0, GFXVT_BASE);
		current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
		acpi_dmar_drhd_fixup(tmp, current);
	}

	{
		const unsigned long tmp = current;
		current += acpi_create_dmar_drhd_4k(current, DRHD_INCLUDE_PCI_ALL, 0, VTVC0_BASE);

		current += acpi_create_dmar_ds_ioapic_from_hw(current, IO_APIC_ADDR,
							      PCH_IOAPIC_PCI_BUS,
							      PCH_IOAPIC_PCI_SLOT, 0);

		size_t i;
		for (i = 0; i < 8; ++i)
			current += acpi_create_dmar_ds_msi_hpet(current, 0, PCH_HPET_PCI_BUS,
					PCH_HPET_PCI_SLOT, i);

		acpi_dmar_drhd_fixup(tmp, current);
	}

	/* Then, add RMRR entries after all DRHD entries */
	if (igfx && igfx->enabled) {
		const unsigned long tmp = current;

		current += acpi_create_igfx_rmrr(current);
		if (current != tmp) {
			current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
			acpi_dmar_rmrr_fixup(tmp, current);
		}
	}

	return current;
}

unsigned long northbridge_write_acpi_tables(const struct device *const dev,
					    unsigned long current,
					    struct acpi_rsdp *const rsdp)
{
	const u32 capid0_a = pci_read_config32(dev, CAPID0_A);
	if (capid0_a & (1 << 23))
		return current;

	printk(BIOS_DEBUG, "ACPI:     * DMAR\n");

	acpi_dmar_t *const dmar = (acpi_dmar_t *)current;

	acpi_create_dmar(dmar, DMAR_INTR_REMAP, acpi_fill_dmar);
	current += dmar->header.length;
	current = acpi_align_current(current);

	acpi_add_table(rsdp, dmar);
	current = acpi_align_current(current);

	printk(BIOS_DEBUG, "current = %lx\n", current);

	return current;
}