[nb|sb]/amd/[amdfam10|sb700]: Add LPC bridge ACPI names for NB/SB

Adds the necessary plumbing for acpi_device_path() to find the LPC
bridge on the AMD Family10h/15h northbridges and SB700 southbridge.

This is necessary for TPM support since the acpi path to the LPC bridge
doesn't match the built-in default in tpm.c

This is a port of GIT hash d8a2c1fb by Tobias Diedrich.

BUG=https://ticket.coreboot.org/issues/102
Change-Id: I1c514e335e194b2864599e5419cfaee830b94e38
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
Reviewed-on: https://review.coreboot.org/19282
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/northbridge/amd/amdfam10/northbridge.c

@@ -2,7 +2,7 @@
  * This file is part of the coreboot project.
  *
  * Copyright (C) 2016 Damien Zammit <damien@zamaudio.com>
- * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
+ * Copyright (C) 2015 - 2017 Timothy Pearson <tpearson@raptorengineering.com>, Raptor Engineering
  * Copyright (C) 2007 Advanced Micro Devices, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
@@ -644,6 +644,13 @@ static void mcf0_control_init(struct device *dev)
 {
 }
 
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+static const char *amdfam10_northbridge_acpi_name(struct device *dev)
+{
+	return "";
+}
+#endif
+
 static struct device_operations northbridge_operations = {
 	.read_resources	  = amdfam10_read_resources,
 	.set_resources	  = amdfam10_set_resources,
@@ -653,6 +660,7 @@ static struct device_operations northbridge_operations = {
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
 	.write_acpi_tables = northbridge_write_acpi_tables,
 	.acpi_fill_ssdt_generator = northbridge_acpi_write_vars,
+	.acpi_name = amdfam10_northbridge_acpi_name,
 #endif
 	.enable		  = 0,
 	.ops_pci	  = 0,
@@ -1302,6 +1310,16 @@ static int amdfam10_get_smbios_data(device_t dev, int *handle, unsigned long *cu
 }
 #endif
 
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+static const char *amdfam10_domain_acpi_name(struct device *dev)
+{
+	if (dev->path.type == DEVICE_PATH_DOMAIN)
+		return "PCI0";
+
+	return NULL;
+}
+#endif
+
 static struct device_operations pci_domain_ops = {
 	.read_resources	  = amdfam10_domain_read_resources,
 	.set_resources	  = amdfam10_domain_set_resources,
@@ -1309,6 +1327,9 @@ static struct device_operations pci_domain_ops = {
 	.init		  = NULL,
 	.scan_bus	  = amdfam10_domain_scan_bus,
 	.ops_pci_bus	  = pci_bus_default_ops,
+#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
+	.acpi_name	  = amdfam10_domain_acpi_name,
+#endif
 #if CONFIG_GENERATE_SMBIOS_TABLES
 	.get_smbios_data  = amdfam10_get_smbios_data,
 #endif

src/southbridge/amd/sb700/lpc.c

@@ -271,6 +271,17 @@ static void southbridge_acpi_fill_ssdt_generator(device_t device) {
 	amd_generate_powernow(ACPI_CPU_CONTROL, 6, 1);
 }
 
+static const char *lpc_acpi_name(struct device *dev) {
+	if (dev->path.type != DEVICE_PATH_PCI)
+		return NULL;
+
+	switch (dev->path.pci.devfn) {
+		case PCI_DEVFN(0x14, 3):
+			return "LPC";
+	}
+
+	return NULL;
+}
 #endif
 
 
@@ -283,7 +294,8 @@ static struct device_operations lpc_ops = {
 	.set_resources = sb700_lpc_set_resources,
 	.enable_resources = sb700_lpc_enable_resources,
 #if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
-	.write_acpi_tables      = acpi_write_hpet,
+	.acpi_name = lpc_acpi_name,
+	.write_acpi_tables = acpi_write_hpet,
 	.acpi_fill_ssdt_generator = southbridge_acpi_fill_ssdt_generator,
 #endif
 	.init = lpc_init,