2 files changed, 96 insertions, 0 deletions
diff --git a/src/soc/amd/picasso/Makefile.inc b/src/soc/amd/picasso/Makefile.inc
index ef2b6b199e..ed94cfb63a 100644
--- a/src/soc/amd/picasso/Makefile.inc
+++ b/src/soc/amd/picasso/Makefile.inc
@@ -44,6 +44,7 @@ ramstage-y += i2c.c
 ramstage-y += chip.c
 ramstage-y += cpu.c
 ramstage-y += data_fabric_util.c
+ramstage-y += root_complex.c
 ramstage-y += mca.c
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += acpi.c
 ramstage-y += gpio.c
diff --git a/src/soc/amd/picasso/root_complex.c b/src/soc/amd/picasso/root_complex.c
new file mode 100644
index 0000000000..f621eeaf31
--- /dev/null
+++ b/src/soc/amd/picasso/root_complex.c
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpigen.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <cpu/amd/msr.h>
+#include <cpu/amd/mtrr.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <fsp/util.h>
+#include <stdint.h>
+
+static void read_resources(struct device *dev)
+{
+	uint32_t mem_usable = (uintptr_t)cbmem_top();
+	unsigned int idx = 0;
+	const struct hob_header *hob = fsp_get_hob_list();
+	const struct hob_resource *res;
+
+	/* 0x0 - 0x9ffff */
+	ram_resource(dev, idx++, 0, 0xa0000 / KiB);
+
+	/* 0xa0000 - 0xbffff: legacy VGA */
+	mmio_resource(dev, idx++, 0xa0000 / KiB, 0x20000 / KiB);
+
+	/* 0xc0000 - 0xfffff: Option ROM */
+	reserved_ram_resource(dev, idx++, 0xc0000 / KiB, 0x40000 / KiB);
+
+	/* 1MB to top of low usable RAM */
+	ram_resource(dev, idx++, 1 * MiB / KiB, (mem_usable - 1 * MiB) / KiB);
+
+	mmconf_resource(dev, MMIO_CONF_BASE);
+
+	if (!hob) {
+		printk(BIOS_ERR, "Error: %s incomplete because no HOB list was found\n",
+				__func__);
+		return;
+	}
+
+	for (; hob->type != HOB_TYPE_END_OF_HOB_LIST; hob = fsp_next_hob(hob)) {
+
+		if (hob->type != HOB_TYPE_RESOURCE_DESCRIPTOR)
+			continue;
+
+		res = fsp_hob_header_to_resource(hob);
+
+		if (res->type == EFI_RESOURCE_SYSTEM_MEMORY && res->addr < mem_usable)
+			continue; /* 0 through low usable was set above */
+		if (res->type == EFI_RESOURCE_MEMORY_MAPPED_IO)
+			continue; /* Done separately */
+
+		if (res->type == EFI_RESOURCE_SYSTEM_MEMORY)
+			ram_resource(dev, idx++, res->addr / KiB, res->length / KiB);
+		else if (res->type == EFI_RESOURCE_MEMORY_RESERVED)
+			reserved_ram_resource(dev, idx++, res->addr / KiB, res->length / KiB);
+		else
+			printk(BIOS_ERR, "Error: failed to set resources for type %d\n",
+					res->type);
+	}
+}
+
+/* Used by \_SB.PCI0._CRS */
+static void root_complex_fill_ssdt(const struct device *device)
+{
+	msr_t msr;
+
+	acpigen_write_scope(acpi_device_scope(device));
+
+	msr = rdmsr(TOP_MEM);
+	acpigen_write_name_dword("TOM1", msr.lo);
+	msr = rdmsr(TOP_MEM2);
+	/*
+	 * Since XP only implements parts of ACPI 2.0, we can't use a qword
+	 * here.
+	 * See http://www.acpi.info/presentations/S01USMOBS169_OS%2520new.ppt
+	 * slide 22ff.
+	 * Shift value right by 20 bit to make it fit into 32bit,
+	 * giving us 1MB granularity and a limit of almost 4Exabyte of memory.
+	 */
+	acpigen_write_name_dword("TOM2", (msr.hi << 12) | msr.lo >> 20);
+	acpigen_pop_len();
+}
+
+static struct device_operations root_complex_operations = {
+	.read_resources		= read_resources,
+	.enable_resources	= pci_dev_enable_resources,
+	.acpi_fill_ssdt		= root_complex_fill_ssdt,
+};
+
+static const struct pci_driver family17_root_complex __pci_driver = {
+	.ops	= &root_complex_operations,
+	.vendor	= PCI_VENDOR_ID_AMD,
+	.device	= PCI_DEVICE_ID_AMD_17H_MODEL_101F_NB,
+};