ums: support block devices not MMC devices

The USB Mass Storage function could equally well support a SATA device
as support an MMC device. Update struct ums to contain a block device
descriptor, not an MMC device descriptor.

Cc: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>

board/samsung/common/ums.c

@@ -7,12 +7,13 @@
 
 #include <common.h>
 #include <usb_mass_storage.h>
+#include <mmc.h>
 #include <part.h>
 
 static int ums_read_sector(struct ums *ums_dev,
 			   ulong start, lbaint_t blkcnt, void *buf)
 {
-	block_dev_desc_t *block_dev = &ums_dev->mmc->block_dev;
+	block_dev_desc_t *block_dev = ums_dev->block_dev;
 	lbaint_t blkstart = start + ums_dev->start_sector;
 	int dev_num = block_dev->dev;
 
@@ -22,7 +23,7 @@ static int ums_read_sector(struct ums *ums_dev,
 static int ums_write_sector(struct ums *ums_dev,
 			    ulong start, lbaint_t blkcnt, const void *buf)
 {
-	block_dev_desc_t *block_dev = &ums_dev->mmc->block_dev;
+	block_dev_desc_t *block_dev = ums_dev->block_dev;
 	lbaint_t blkstart = start + ums_dev->start_sector;
 	int dev_num = block_dev->dev;
 
@@ -45,7 +46,7 @@ static struct ums *ums_disk_init(struct mmc *mmc)
 		return NULL;
 	}
 
-	ums_dev.mmc = mmc;
+	ums_dev.block_dev = &mmc->block_dev;
 
 	if (ums_end_sector <= mmc_end_sector) {
 		ums_dev.start_sector = UMS_START_SECTOR;

include/usb_mass_storage.h

@@ -9,7 +9,7 @@
 #define __USB_MASS_STORAGE_H__
 
 #define SECTOR_SIZE		0x200
-#include <mmc.h>
+#include <part.h>
 #include <linux/usb/composite.h>
 
 #ifndef UMS_START_SECTOR
@@ -31,7 +31,7 @@ struct ums {
 	unsigned int start_sector;
 	unsigned int num_sectors;
 	const char *name;
-	struct mmc *mmc;
+	block_dev_desc_t *block_dev;
 };
 
 extern struct ums *ums;