[MTD] [NAND] Hardware ECC controller on at91sam9263 / at91sam9260

This is a patch to use the hardware ECC controller of
the AT91SAM9260 and AT91SAM9263 for the AT91 nand.
On AT91 NAND, there's now a choice between ECC soft,
ECC hard or no ECC (for debug).

It has been tested on AT91SAM9263 with 8 bits large
and small page NAND.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index dcbb0decd465..5076faf9ca66 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -278,6 +278,47 @@ config MTD_NAND_AT91
         help
           Enables support for NAND Flash / Smart Media Card interface
           on Atmel AT91 processors.
+choice
+        prompt "ECC management for NAND Flash / SmartMedia on AT91"
+        depends on MTD_NAND_AT91
+
+config MTD_NAND_AT91_ECC_HW
+        bool "Hardware ECC"
+        depends on ARCH_AT91SAM9263 || ARCH_AT91SAM9260
+        help
+          Uses hardware ECC provided by the at91sam9260/at91sam9263 chip
+          instead of software ECC.
+          The hardware ECC controller is capable of single bit error
+          correction and 2-bit random detection per page.
+
+          NB : hardware and software ECC schemes are incompatible.
+          If you switch from one to another, you'll have to erase your
+          mtd partition.
+
+          If unsure, say Y
+
+config MTD_NAND_AT91_ECC_SOFT
+        bool "Software ECC"
+        help
+          Uses software ECC.
+
+          NB : hardware and software ECC schemes are incompatible.
+          If you switch from one to another, you'll have to erase your
+          mtd partition.
+
+config MTD_NAND_AT91_ECC_NONE
+        bool "No ECC (testing only, DANGEROUS)"
+        depends on DEBUG_KERNEL
+        help
+          No ECC will be used.
+          It's not a good idea and it should be reserved for testing
+          purpose only.
+
+          If unsure, say N
+
+          endchoice
+
+endchoice
 
 config MTD_NAND_PXA3xx
         bool "Support for NAND flash devices on PXA3xx"