spl: Convert spl_net_load_image() to use linker list

Add a linker list declaration for this method and remove the explicit
switch() code. We need two variants - one for BOOT_DEVICE_CPGMAC and one for
BOOT_DEVICE_USBETH.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NTom Rini <trini@konsulko.com>

common/spl/spl.c

@@ -384,19 +384,6 @@ static int spl_load_image(u32 boot_device)
 		return loader->load_image(&bootdev);
 
 	switch (boot_device) {
-#ifdef CONFIG_SPL_ETH_SUPPORT
-	case BOOT_DEVICE_CPGMAC:
-#ifdef CONFIG_SPL_ETH_DEVICE
-		bootdev.boot_device_name = CONFIG_SPL_ETH_DEVICE;
-#endif
-		return spl_net_load_image(&bootdev);
-#endif
-#ifdef CONFIG_SPL_USBETH_SUPPORT
-	case BOOT_DEVICE_USBETH:
-		bootdev.boot_device_name = "usb_ether";
-		return spl_net_load_image(&bootdev);
-#endif
-#endif
 #ifdef CONFIG_SPL_BOARD_LOAD_IMAGE
 	case BOOT_DEVICE_BOARD:
 		return spl_board_load_image(&bootdev);

common/spl/spl_net.c

@@ -14,7 +14,8 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int spl_net_load_image(struct spl_boot_device *bootdev)
+#if defined(CONFIG_SPL_ETH_SUPPORT) || defined(CONFIG_SPL_USBETH_SUPPORT)
+static int spl_net_load_image(struct spl_boot_device *bootdev)
 {
 	int rv;
 
@@ -37,3 +38,26 @@ int spl_net_load_image(struct spl_boot_device *bootdev)
 	return spl_parse_image_header(&spl_image,
 				      (struct image_header *)load_addr);
 }
+#endif
+
+#ifdef CONFIG_SPL_ETH_SUPPORT
+int spl_net_load_image_cpgmac(struct spl_boot_device *bootdev)
+{
+#ifdef CONFIG_SPL_ETH_DEVICE
+	bootdev->boot_device_name = CONFIG_SPL_ETH_DEVICE;
+#endif
+
+	return spl_net_load_image(bootdev);
+}
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_CPGMAC, spl_net_load_image_cpgmac);
+#endif
+
+#ifdef CONFIG_SPL_USBETH_SUPPORT
+int spl_net_load_image_usb(struct spl_boot_device *bootdev)
+{
+	bootdev->boot_device_name = "usb_ether";
+
+	return spl_net_load_image(bootdev);
+}
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_USBETH, spl_net_load_image_usb);
+#endif

include/spl.h

@@ -181,9 +181,6 @@ struct spl_image_loader {
 		.load_image = __method, \
 	}
 
-/* Ethernet SPL functions */
-int spl_net_load_image(struct spl_boot_device *bootdev);
-
 /* SPL FAT image functions */
 int spl_load_image_fat(struct blk_desc *block_dev, int partition,
 		       const char *filename);