spl: Convert spl_mmc_load_image() to use linker list

Add a linker list declaration for this method and remove the explicit
switch() code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

common/spl/spl.c

@@ -384,12 +384,6 @@ static int spl_load_image(u32 boot_device)
 		return loader->load_image(&bootdev);
 
 	switch (boot_device) {
-#ifdef CONFIG_SPL_MMC_SUPPORT
-	case BOOT_DEVICE_MMC1:
-	case BOOT_DEVICE_MMC2:
-	case BOOT_DEVICE_MMC2_2:
-		return spl_mmc_load_image(&bootdev);
-#endif
 #ifdef CONFIG_SPL_UBI
 	case BOOT_DEVICE_NAND:
 	case BOOT_DEVICE_ONENAND:

common/spl/spl_mmc.c

@@ -267,7 +267,7 @@ int spl_mmc_do_fs_boot(struct mmc *mmc)
 }
 #endif
 
-int spl_mmc_load_image(struct spl_boot_device *bootdev)
+static int spl_mmc_load_image(struct spl_boot_device *bootdev)
 {
 	struct mmc *mmc = NULL;
 	u32 boot_mode;
@@ -345,3 +345,7 @@ int spl_mmc_load_image(struct spl_boot_device *bootdev)
 
 	return err;
 }
+
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_MMC1, spl_mmc_load_image);
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_MMC2, spl_mmc_load_image);
+SPL_LOAD_IMAGE_METHOD(0, BOOT_DEVICE_MMC2_2, spl_mmc_load_image);

include/spl.h

@@ -193,9 +193,6 @@ int spl_nor_load_image(struct spl_boot_device *bootdev);
 /* UBI SPL functions */
 int spl_ubi_load_image(struct spl_boot_device *bootdev);
 
-/* MMC SPL functions */
-int spl_mmc_load_image(struct spl_boot_device *bootdev);
-
 /* YMODEM SPL functions */
 int spl_ymodem_load_image(struct spl_boot_device *bootdev);