fs: Adds diskio interface

Adds the diskio interface for the FAT file system.  This
revision uses RAM to emulate disk storage.

Origin: Original
Jira: ZEP-285
Change-Id: I7a30c8761d5ed9b564f1d1e08482c5ef199d7372
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>

include/fs/fat_diskio.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _FAT_DISKIO_H_
+#define _FAT_DISKIO_H_
+
+#include <diskio.h>
+#include <stdint.h>
+
+DSTATUS fat_disk_status(void);
+DSTATUS fat_disk_initialize(void);
+DRESULT fat_disk_read(uint8_t *buff, unsigned long sector, uint32_t count);
+DRESULT fat_disk_write(const uint8_t *buff, unsigned long sector,
+		       uint32_t count);
+DRESULT fat_disk_ioctl(uint8_t cmd, void *buff);
+
+#endif /* _FAT_DISKIO_H_ */