fsp_broadwell_de: Add DMAR table to ACPI

Create DMAR table for Broadwell-DE SoC.

TEST=Booted MC BDX1 into lubuntu15, dumped ACPI tables with acpidump and
     disassembled DMAR table using iasl. The table contents are as
     expected and the kernel loads DMAR table without errors.

Change-Id: I7933ba4f5f0539a50f2ab9a5571e502c84873ec6
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/15913
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

1 files changed, 99 insertions, 0 deletions

diff --git a/src/soc/intel/fsp_broadwell_de/acpi.c b/src/soc/intel/fsp_broadwell_de/acpi.c
index 1e088684c0..1647505820 100644
--- a/src/soc/intel/fsp_broadwell_de/acpi.c
+++ b/src/soc/intel/fsp_broadwell_de/acpi.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2007-2009 coresystems GmbH
  * Copyright (C) 2013 Google Inc.
  * Copyright (C) 2015-2016 Intel Corp.
+ * Copyright (C) 2016 Siemens AG
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -35,6 +36,7 @@
 #include <soc/msr.h>
 #include <soc/pattrs.h>
 #include <soc/pci_devs.h>
+#include <soc/broadwell_de.h>
 #include <chip.h>
 
 uint16_t get_pmbase(void)
@@ -312,6 +314,103 @@ void acpi_fill_in_fadt(acpi_fadt_t *fadt, acpi_facs_t *facs, void *dsdt)
 	header->checksum = acpi_checksum((void *) fadt, sizeof(acpi_fadt_t));
 }
 
+static unsigned long acpi_fill_dmar(unsigned long current)
+{
+	uint32_t vtbar, tmp = current;
+	struct device *dev = dev_find_slot(0, VTD_DEV_FUNC);
+	uint16_t bdf, hpet_bdf[8];
+	uint8_t i, j;
+
+	if (!dev)
+		return current;
+
+	vtbar = pci_read_config32(dev, VTBAR_OFFSET) & VTBAR_MASK;
+	if (!vtbar)
+		return current;
+
+	current += acpi_create_dmar_drhd(current,
+			DRHD_INCLUDE_PCI_ALL, 0, vtbar);
+	/* The IIO I/O APIC is fixed on PCI 00:05.4 on Broadwell-DE */
+	current += acpi_create_dmar_drhd_ds_ioapic(current,
+			9, 0, 5, 4);
+	/* Get the PCI BDF for the PCH I/O APIC */
+	dev = dev_find_slot(0, LPC_DEV_FUNC);
+	bdf = pci_read_config16(dev, 0x6c);
+	current += acpi_create_dmar_drhd_ds_ioapic(current,
+			8, (bdf >> 8), PCI_SLOT(bdf), PCI_FUNC(bdf));
+
+	/*
+	 * Check if there are different PCI paths for the 8 HPET timers
+	 * and add every different PCI path as a separate HPET entry.
+	 * Although the DMAR specification talks about HPET block for this
+	 * entry, it is possible to assign a unique PCI BDF to every single
+	 * timer within a HPET block which will result in different source
+	 * IDs reported by a generated MSI.
+	 * In default configuration every single timer will have the same
+	 * PCI BDF which will result in a single HPET entry in DMAR table.
+	 * I have checked several different systems and all of them had one
+	 * single entry for HPET in DMAR.
+	 */
+	memset(hpet_bdf, 0, sizeof(hpet_bdf));
+	/* Get all unique HPET paths. */
+	for (i = 0; i < ARRAY_SIZE(hpet_bdf); i++) {
+		bdf = pci_read_config16(dev, 0x70 + (i * 2));
+		for (j = 0; j < i; j++) {
+			if (hpet_bdf[j] == bdf)
+				break;
+		}
+		if (j == i)
+			hpet_bdf[i] = bdf;
+	}
+	/* Create one HPET entry in DMAR for every unique HPET PCI path. */
+	for (i = 0; i < ARRAY_SIZE(hpet_bdf); i++) {
+		if (hpet_bdf[i])
+			current += acpi_create_dmar_drhd_ds_msi_hpet(current,
+				0, (hpet_bdf[i] >> 8), PCI_SLOT(hpet_bdf[i]),
+				PCI_FUNC(hpet_bdf[i]));
+	}
+	acpi_dmar_drhd_fixup(tmp, current);
+
+	/* Create root port ATSR capability */
+	tmp = current;
+	current += acpi_create_dmar_atsr(current, 0, 0);
+	/* Add one entry to ATSR for each PCI root port */
+	dev = all_devices;
+	do {
+		dev = dev_find_class(PCI_CLASS_BRIDGE_PCI << 8, dev);
+		if (dev && dev->bus->secondary == 0 &&
+		    PCI_SLOT(dev->path.pci.devfn) <= 3)
+			current += acpi_create_dmar_drhd_ds_pci_br(current,
+					dev->bus->secondary,
+					PCI_SLOT(dev->path.pci.devfn),
+					PCI_FUNC(dev->path.pci.devfn));
+	} while (dev);
+	acpi_dmar_atsr_fixup(tmp, current);
+
+	return current;
+}
+
+unsigned long northcluster_write_acpi_tables(struct device *const dev,
+					     unsigned long current,
+					     struct acpi_rsdp *const rsdp)
+{
+	acpi_dmar_t *const dmar = (acpi_dmar_t *)current;
+	device_t vtdev = dev_find_slot(0, PCI_DEVFN(5, 0));
+
+	/* Create DMAR table only if virtualization is enabled */
+	if (!(pci_read_config32(vtdev, 0x180) & 0x01))
+		return current;
+
+	printk(BIOS_DEBUG, "ACPI:    * DMAR\n");
+	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);
+
+	return current;
+}
+
 static int calculate_power(int tdp, int p1_ratio, int ratio)
 {
 	u32 m;