[MTD] Unlock NOR flash automatically where necessary

Introduce the MTD_STUPID_LOCK flag which indicates that the flash chip is
always locked after power-up, so all sectors need to be unlocked before it
is usable.

If this flag is set, and the chip provides an unlock() operation,
mtd_add_device will unlock the whole MTD device if it's writeable.  This
means that non-writeable partitions will stay locked.

Set MTD_STUPID_LOCK in fixup_use_atmel_lock() so that these chips will work
as expected.

Signed-off-by: Håvard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/mtd/mtd-abi.h b/include/mtd/mtd-abi.h
index 1da3f7fa7993..b0a67b7ffdcd 100644
--- a/include/mtd/mtd-abi.h
+++ b/include/mtd/mtd-abi.h
@@ -34,6 +34,7 @@ struct mtd_oob_buf {
 #define MTD_WRITEABLE           0x400   /* Device is writeable */
 #define MTD_BIT_WRITEABLE       0x800   /* Single bits can be flipped */
 #define MTD_NO_ERASE            0x1000  /* No erase necessary */
+#define MTD_STUPID_LOCK         0x2000  /* Always locked after reset */
 
 // Some common devices / combinations of capabilities
 #define MTD_CAP_ROM             0