disk/part.c: Expose list of available block drivers

We have a pretty nice and generic interface to ask for a specific block
device. However, that one is still based around the magic notion that
we know the driver name.

In order to be able to write fully generic disk access code, expose the
currently internal list to other source files so that they can scan through
all available block drivers.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NSimon Glass <sjg@chromium.org>
Tested-by: NSimon Glass <sjg@chromium.org>

disk/part.c

@@ -21,13 +21,7 @@
 #define PRINTF(fmt,args...)
 #endif
 
-struct block_drvr {
-	char *name;
-	struct blk_desc* (*get_dev)(int dev);
-	int (*select_hwpart)(int dev_num, int hwpart);
-};
-
-static const struct block_drvr block_drvr[] = {
+const struct block_drvr block_drvr[] = {
 #if defined(CONFIG_CMD_IDE)
 	{ .name = "ide", .get_dev = ide_get_dev, },
 #endif

include/part.h

@@ -10,6 +10,12 @@
 #include <blk.h>
 #include <ide.h>
 
+struct block_drvr {
+	char *name;
+	struct blk_desc* (*get_dev)(int dev);
+	int (*select_hwpart)(int dev_num, int hwpart);
+};
+
 #define LOG2(x) (((x & 0xaaaaaaaa) ? 1 : 0) + ((x & 0xcccccccc) ? 2 : 0) + \
 		 ((x & 0xf0f0f0f0) ? 4 : 0) + ((x & 0xff00ff00) ? 8 : 0) + \
 		 ((x & 0xffff0000) ? 16 : 0))
@@ -165,6 +171,7 @@ int blk_get_device_by_str(const char *ifname, const char *dev_str,
 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 			    struct blk_desc **dev_desc,
 			    disk_partition_t *info, int allow_whole_dev);
+extern const struct block_drvr block_drvr[];
 #else
 static inline struct blk_desc *blk_get_dev(const char *ifname, int dev)
 { return NULL; }