soc/amd/picasso: Add PCI driver for data fabric devices

Data fabric devices are PCI devices which support PCI configuration
space but do not require any MMIO/IO resources. This change adds a PCI
driver for the data fabric devices which only provides device
operations for adding node to SSDT and returning the ACPI name for the
device.

Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I3da9287db5febf1a1d7eb1dfbed9f1348f80a588
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43314
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/amd/picasso/Makefile.inc

@@ -52,7 +52,7 @@ verstage_x86-y += reset.c
 ramstage-y += i2c.c
 ramstage-y += chip.c
 ramstage-y += cpu.c
-ramstage-y += data_fabric_util.c
+ramstage-y += data_fabric.c
 ramstage-y += root_complex.c
 ramstage-y += mca.c
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += acpi.c

src/soc/amd/picasso/data_fabric.c

@@ -1,7 +1,11 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <acpi/acpi_device.h>
 #include <console/console.h>
 #include <cpu/x86/lapic_def.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
 #include <device/pci_ops.h>
 #include <soc/data_fabric.h>
 #include <soc/iomap.h>
@@ -115,3 +119,51 @@ void data_fabric_set_mmio_np(void)
 			   (IOMS0_FABRIC_ID << MMIO_DST_FABRIC_ID_SHIFT) | MMIO_NP | MMIO_WE
 				   | MMIO_RE);
 }
+
+static const char *data_fabric_acpi_name(const struct device *dev)
+{
+	switch (dev->device) {
+	case PCI_DEVICE_ID_AMD_FAM17H_DF0:
+		return "DFD0";
+	case PCI_DEVICE_ID_AMD_FAM17H_DF1:
+		return "DFD1";
+	case PCI_DEVICE_ID_AMD_FAM17H_DF2:
+		return "DFD2";
+	case PCI_DEVICE_ID_AMD_FAM17H_DF3:
+		return "DFD3";
+	case PCI_DEVICE_ID_AMD_FAM17H_DF4:
+		return "DFD4";
+	case PCI_DEVICE_ID_AMD_FAM17H_DF5:
+		return "DFD5";
+	case PCI_DEVICE_ID_AMD_FAM17H_DF6:
+		return "DFD6";
+	default:
+		printk(BIOS_ERR, "%s: Unhandled device id 0x%x\n", __func__, dev->device);
+	}
+
+	return NULL;
+}
+
+static struct device_operations data_fabric_ops = {
+	.read_resources		= noop_read_resources,
+	.set_resources		= noop_set_resources,
+	.acpi_name		= data_fabric_acpi_name,
+	.acpi_fill_ssdt		= acpi_device_write_pci_dev,
+};
+
+static const unsigned short pci_device_ids[] = {
+	PCI_DEVICE_ID_AMD_FAM17H_DF0,
+	PCI_DEVICE_ID_AMD_FAM17H_DF1,
+	PCI_DEVICE_ID_AMD_FAM17H_DF2,
+	PCI_DEVICE_ID_AMD_FAM17H_DF3,
+	PCI_DEVICE_ID_AMD_FAM17H_DF4,
+	PCI_DEVICE_ID_AMD_FAM17H_DF5,
+	PCI_DEVICE_ID_AMD_FAM17H_DF6,
+	0
+};
+
+static const struct pci_driver data_fabric_driver __pci_driver = {
+	.ops			= &data_fabric_ops,
+	.vendor			= PCI_VENDOR_ID_AMD,
+	.devices		= pci_device_ids,
+};