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mtd: nand: remove AG-AND support

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We have only one AG-AND driver and it was not touched since 2005. It looks
like AG-AND was not really make it to mass-production and can be considered
a dead technology.

Along with the AG-AND support, this patch removes the BBT_AUTO_REFRESH feature,
because the only user of this feature is AG-AND. And even though it is
implemented as a generic feature, I prefer to remove it because NAND flashes do
not really need it in this form.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy
2013-03-04 14:21:34 +02:00
committed by David Woodhouse
parent 02f57fe448
commit 14c6578683
4 changed files with 2 additions and 132 deletions
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25
drivers/mtd/nand/nand_bbt.c
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@@ -1240,15 +1240,6 @@ int nand_update_bbt(struct mtd_info *mtd, loff_t offs)
*/
static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
static uint8_t scan_agand_pattern[] = { 0x1C, 0x71, 0xC7, 0x1C, 0x71, 0xC7 };
static struct nand_bbt_descr agand_flashbased = {
.options = NAND_BBT_SCANEMPTY | NAND_BBT_SCANALLPAGES,
.offs = 0x20,
.len = 6,
.pattern = scan_agand_pattern
};
/* Generic flash bbt descriptors */
static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
static uint8_t mirror_pattern[] = {'1', 't', 'b', 'B' };
@@ -1333,22 +1324,6 @@ int nand_default_bbt(struct mtd_info *mtd)
{
struct nand_chip *this = mtd->priv;
/*
* Default for AG-AND. We must use a flash based bad block table as the
* devices have factory marked _good_ blocks. Erasing those blocks
* leads to loss of the good / bad information, so we _must_ store this
* information in a good / bad table during startup.
*/
if (this->options & NAND_IS_AND) {
/* Use the default pattern descriptors */
if (!this->bbt_td) {
this->bbt_td = &bbt_main_descr;
this->bbt_md = &bbt_mirror_descr;
}
this->bbt_options |= NAND_BBT_USE_FLASH;
return nand_scan_bbt(mtd, &agand_flashbased);
}
/* Is a flash based bad block table requested? */
if (this->bbt_options & NAND_BBT_USE_FLASH) {
/* Use the default pattern descriptors */