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[MTD] Unlock NOR flash automatically where necessary

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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>
This commit is contained in:
Håvard Skinnemoen
2006-09-22 10:07:08 +01:00
committed by David Woodhouse
parent e478bec0ba
commit 187ef15268
3 changed files with 12 additions and 0 deletions
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1
include/mtd/mtd-abi.h
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@@ -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