mflash: initial support
This driver supports mflash IO mode for linux.
Mflash is embedded flash drive and mainly targeted mobile and consumer
electronic devices.
Internally, mflash has nand flash and other hardware logics and supports 2
different operation (ATA, IO) modes. ATA mode doesn't need any new driver
and currently works well under standard IDE subsystem. Actually it's one
chip SSD. IO mode is ATA-like custom mode for the host that doesn't have
IDE interface.
Followings are brief descriptions about IO mode.
A. IO mode based on ATA protocol and uses some custom command. (read confirm,
write confirm)
B. IO mode uses SRAM bus interface.
C. IO mode supports 4kB boot area, so host can boot from mflash.
This driver is quitely similar to a standard ATA driver, but because of
following reasons it is currently seperated with ATA layer.
1. ATA layer deals standard ATA protocol. ATA layer have many low-
level device specific interface, but data transfer keeps ATA rule.
But, mflash IO mode doesn't.
2. Even though currently not used in mflash driver code, mflash has
some custom command and modes. (nand fusing, firmware patch, etc) If
this feature supported in linux kernel, ATA layer more altered.
3. Currently PATA platform device driver doesn't support interrupt.
(I'm not sure) But, mflash uses interrupt (polling mode is just for
debug).
4. mflash is somewhat under-develop product. Even though some company
already using mflash their own product, I think more time is needed for
standardization of custom command and mode. That time (maybe October)
I will talk to with ATA people. If they accept integration, I will
integrate.
Signed-off-by: unsik Kim <donari75@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index e7b8aa0..ddea8e4 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -410,6 +410,23 @@
This driver provides Support for ATA over Ethernet block
devices like the Coraid EtherDrive (R) Storage Blade.
+config MG_DISK
+ tristate "mGine mflash, gflash support"
+ depends on ARM && ATA && GPIOLIB
+ help
+ mGine mFlash(gFlash) block device driver
+
+config MG_DISK_RES
+ int "Size of reserved area before MBR"
+ depends on MG_DISK
+ default 0
+ help
+ Define size of reserved area that usually used for boot. Unit is KB.
+ All of the block device operation will be taken this value as start
+ offset
+ Examples:
+ 1024 => 1 MB
+
config SUNVDC
tristate "Sun Virtual Disk Client support"
depends on SUN_LDOMS