mtd:add dhara compatiblity layer

to support dhara ftl for fatfs

Signed-off-by: guohao15 <guohao15@xiaomi.com>

drivers/mtd/Kconfig

@@ -1215,4 +1215,19 @@ config GD5F_SPIFREQUENCY
 
 endif # MTD_GD5F
 
+config MTD_DHARA
+	bool "MTD Nandflash use dhara map"
+	default n
+
+if MTD_DHARA
+
+config DHARA_GC_RATIO
+	int "dhara garbage collection ratio"
+	default 4
+
+config DHARA_READ_NCACHES
+	int "dhara read cache numbers"
+	default 4
+endif
+
 endif # MTD

drivers/mtd/Make.defs

@@ -164,6 +164,31 @@ CSRCS += smart.c
 endif
 endif
 
+ifeq ($(CONFIG_MTD_DHARA),y)
+
+master.zip:
+	$(call DOWNLOAD,https://github.com/dlbeer/dhara/archive/refs/heads,master.zip)
+
+.dharaunpack: master.zip
+	$(Q) unzip master.zip -d mtd/
+	$(Q) mv mtd/dhara-master mtd/dhara
+	$(Q) touch mtd/dhara/.dharaunpack
+
+ifeq ($(wildcard mtd/dhara/.git),)
+context:: .dharaunpack
+
+distclean::
+	$(call DELFILE, master.zip)
+	$(call DELDIR, mtd/dhara)
+endif
+
+CSRCS += dhara.c
+CSRCS += mtd/dhara/dhara/map.c
+CSRCS += mtd/dhara/dhara/error.c
+CSRCS += mtd/dhara/dhara/journal.c
+CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)drivers$(DELIM)mtd$(DELIM)dhara
+endif
+
 # Include MTD driver support
 
 DEPPATH += --dep-path mtd

include/nuttx/mtd/mtd.h

@@ -723,6 +723,40 @@ int rpmsgmtd_register(FAR const char *remotecpu, FAR const char *remotepath,
 int rpmsgmtd_server_init(void);
 #endif
 
+/****************************************************************************
+ * Name: dhara_initialize
+ *
+ * Description:
+ *   Initialize to provide a block driver wrapper around an MTD interface
+ *
+ * Input Parameters:
+ *   minor - The minor device number.  The MTD block device will be
+ *           registered as as /dev/mtdblockN where N is the minor number.
+ *   mtd   - The MTD device that supports the FLASH interface.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_MTD_DHARA
+int dhara_initialize(int minor, FAR struct mtd_dev_s *mtd);
+#endif
+
+/****************************************************************************
+ * Name: dhara_initialize_by_path
+ *
+ * Description:
+ *   Initialize to provide a block driver wrapper around an MTD interface
+ *
+ * Input Parameters:
+ *   path - The block device path.
+ *   mtd  - The MTD device that supports the FLASH interface.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_MTD_DHARA
+int dhara_initialize_by_path(FAR const char *path,
+                             FAR struct mtd_dev_s *mtd);
+#endif
+
 #undef EXTERN
 #ifdef __cplusplus
 }