dm: mmc: Support erase

At present erase is not suported with CONFIG_DM_OPS. Add it so that MMC
devices can be erased.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/mmc/mmc-uclass.c

@@ -262,6 +262,7 @@ static const struct blk_ops mmc_blk_ops = {
 	.read	= mmc_bread,
 #ifndef CONFIG_SPL_BUILD
 	.write	= mmc_bwrite,
+	.erase	= mmc_berase,
 #endif
 	.select_hwpart	= mmc_select_hwpart,
 };

drivers/mmc/mmc_private.h

@@ -29,15 +29,15 @@ ulong mmc_bread(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt,
 #endif
 
 #if !(defined(CONFIG_SPL_BUILD) && !defined(CONFIG_SPL_SAVEENV))
-unsigned long mmc_berase(struct blk_desc *block_dev, lbaint_t start,
-			 lbaint_t blkcnt);
 
 #ifdef CONFIG_BLK
 ulong mmc_bwrite(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
 		 const void *src);
+ulong mmc_berase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt);
 #else
 ulong mmc_bwrite(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt,
 		 const void *src);
+ulong mmc_berase(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt);
 #endif
 
 #else /* CONFIG_SPL_BUILD and CONFIG_SPL_SAVEENV is not defined */

drivers/mmc/mmc_write.c

@@ -66,9 +66,15 @@ err_out:
 	return err;
 }
 
-unsigned long mmc_berase(struct blk_desc *block_dev, lbaint_t start,
-			 lbaint_t blkcnt)
+#ifdef CONFIG_BLK
+ulong mmc_berase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt)
+#else
+ulong mmc_berase(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt)
+#endif
 {
+#ifdef CONFIG_BLK
+	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
+#endif
 	int dev_num = block_dev->devnum;
 	int err = 0;
 	u32 start_rem, blkcnt_rem;