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| author | Håvard Skinnemoen <hskinnemoen@atmel.com> | 2006-09-22 10:07:08 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2006-09-22 10:07:08 +0100 |
| commit | 187ef15268e638603dea55a91fdfa29feaed6d13 (patch) | |
| tree | a3895b43f90ed87ae54e3b066468ac2c8fdf31ee | |
| parent | e478bec0ba0a83a48a0f6982934b6de079e7e6b3 (diff) | |
| download | linux-stable-187ef15268e638603dea55a91fdfa29feaed6d13.tar.gz linux-stable-187ef15268e638603dea55a91fdfa29feaed6d13.tar.bz2 linux-stable-187ef15268e638603dea55a91fdfa29feaed6d13.zip | |
[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>
| -rw-r--r-- | drivers/mtd/chips/cfi_cmdset_0002.c | 1 | ||||
| -rw-r--r-- | drivers/mtd/mtdcore.c | 10 | ||||
| -rw-r--r-- | include/mtd/mtd-abi.h | 1 |
3 files changed, 12 insertions, 0 deletions
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c index a482e8922de1..702ae4cd8691 100644 --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -212,6 +212,7 @@ static void fixup_use_atmel_lock(struct mtd_info *mtd, void *param) { mtd->lock = cfi_atmel_lock; mtd->unlock = cfi_atmel_unlock; + mtd->flags |= MTD_STUPID_LOCK; } static struct cfi_fixup cfi_fixup_table[] = { diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 168d3ba063c3..c4d26de74349 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -57,6 +57,16 @@ int add_mtd_device(struct mtd_info *mtd) mtd->index = i; mtd->usecount = 0; + /* Some chips always power up locked. Unlock them now */ + if ((mtd->flags & MTD_WRITEABLE) + && (mtd->flags & MTD_STUPID_LOCK) && mtd->unlock) { + if (mtd->unlock(mtd, 0, mtd->size)) + printk(KERN_WARNING + "%s: unlock failed, " + "writes may not work\n", + mtd->name); + } + DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name); /* No need to get a refcount on the module containing the notifier, since we hold the mtd_table_mutex */ 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 |