sconfig: Add a new generic device type

Add support for a basic generic device in the devicetree to bind to a
device that does not have a specific bus, but may need to be described
in tables for the operating system.  For instance some chips may have
various GPIO connections that need described but do not fall under any
other device.

In order to support this export the basic 'scan_static_bus()' that can
be used in a device_operations->scan_bus() method to scan for the generic
devices.

It has been possible to get a semi-generic device by using a fake PNP
device, but that isn't really appropriate for many devices.

Also Re-generate the shipped files for sconfig.  Use flex 2.6.0 to avoid
everything being rewritten.  Clean up the local paths that leak into the
generated configs.

Change-Id: If45a5b18825bdb2cf1e4ba4297ee426cbd1678e3
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://review.coreboot.org/14789
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Leroy P Leahy <leroy.p.leahy@intel.com>

4 files changed, 24 insertions, 2 deletions

diff --git a/src/device/device_util.c b/src/device/device_util.c
index b538212a83..56afefdc87 100644
--- a/src/device/device_util.c
+++ b/src/device/device_util.c
@@ -222,6 +222,9 @@ u32 dev_path_encode(device_t dev)
 	case DEVICE_PATH_IOAPIC:
 		ret |= dev->path.ioapic.ioapic_id;
 		break;
+	case DEVICE_PATH_GENERIC:
+		ret |= dev->path.generic.subid << 8 | dev->path.generic.id;
+		break;
 	case DEVICE_PATH_NONE:
 	default:
 		break;
@@ -286,6 +289,11 @@ const char *dev_path(device_t dev)
 			snprintf(buffer, sizeof (buffer),
 				 "CPU_BUS: %02x", dev->path.cpu_bus.id);
 			break;
+		case DEVICE_PATH_GENERIC:
+			snprintf(buffer, sizeof (buffer),
+				 "GENERIC: %d.%d", dev->path.generic.id,
+				 dev->path.generic.subid);
+			break;
 		default:
 			printk(BIOS_ERR, "Unknown device path type: %d\n",
 			       dev->path.type);
@@ -353,6 +361,10 @@ int path_eq(struct device_path *path1, struct device_path *path2)
 	case DEVICE_PATH_CPU_BUS:
 		equal = (path1->cpu_bus.id == path2->cpu_bus.id);
 		break;
+	case DEVICE_PATH_GENERIC:
+		equal = (path1->generic.id == path2->generic.id) &&
+			(path1->generic.subid == path2->generic.subid);
+		break;
 	default:
 		printk(BIOS_ERR, "Unknown device type: %d\n", path1->type);
 		break;
diff --git a/src/device/root_device.c b/src/device/root_device.c
index 6b961005f9..7ff10ae844 100644
--- a/src/device/root_device.c
+++ b/src/device/root_device.c
@@ -43,7 +43,7 @@ const char mainboard_name[] = CONFIG_MAINBOARD_VENDOR " " CONFIG_MAINBOARD_PART_
  * @param bus Pointer to the device to which the static buses are attached to.
  */
 
-static void scan_static_bus(device_t bus)
+void scan_static_bus(device_t bus)
 {
 	device_t child;
 	struct bus *link;
diff --git a/src/include/device/device.h b/src/include/device/device.h
index 62460aea6a..d9af64adf5 100644
--- a/src/include/device/device.h
+++ b/src/include/device/device.h
@@ -232,6 +232,7 @@ void fixed_mem_resource(device_t dev, unsigned long index,
 		  unsigned long basek, unsigned long sizek, unsigned long type);
 
 void scan_smbus(device_t bus);
+void scan_static_bus(device_t bus);
 void scan_lpc_bus(device_t bus);
 
 /* It is the caller's responsibility to adjust regions such that ram_resource()
diff --git a/src/include/device/path.h b/src/include/device/path.h
index 8421a38473..9d7fb38d42 100644
--- a/src/include/device/path.h
+++ b/src/include/device/path.h
@@ -13,6 +13,7 @@ enum device_path_type {
 	DEVICE_PATH_CPU,
 	DEVICE_PATH_CPU_BUS,
 	DEVICE_PATH_IOAPIC,
+	DEVICE_PATH_GENERIC,
 
 	/*
 	 * When adding path types to this table, please also update the
@@ -31,7 +32,8 @@ enum device_path_type {
 		"DEVICE_PATH_CPU_CLUSTER",	\
 		"DEVICE_PATH_CPU",		\
 		"DEVICE_PATH_CPU_BUS",		\
-		"DEVICE_PATH_IOAPIC"		\
+		"DEVICE_PATH_IOAPIC",		\
+		"DEVICE_PATH_GENERIC"		\
 }
 
 struct domain_path
@@ -85,6 +87,12 @@ struct cpu_bus_path
 	unsigned id;
 };
 
+struct generic_path
+{
+	unsigned id;
+	unsigned subid;
+};
+
 
 struct device_path {
 	enum device_path_type type;
@@ -98,6 +106,7 @@ struct device_path {
 		struct cpu_cluster_path cpu_cluster;
 		struct cpu_path		cpu;
 		struct cpu_bus_path	cpu_bus;
+		struct generic_path	generic;
 	};
 };