[MTD] [NAND] Blackfin on-chip NAND Flash Controller driver

This is the driver for latest Blackfin on-chip nand flash controller

 - use nand_chip and mtd_info common nand driver interface
 - provide both PIO and dma operation
 - compiled with ezkit bf548 configuration
 - use hardware 1-bit ECC
 - tested with YAFFS2 and can mount YAFFS2 filesystem as rootfs

ChangeLog from try#1
 - use hweight32() instead of count_bits()
 - replace bf54x with bf5xx and BF54X with BF5XX
 - compare against plat->page_size in 2 cases when enable hardware ECC

ChangeLog from try#2
 - passed nand_test suites
 - use cpu_relax() instead of busy wait loop
 - some coding style issue pointed out by Andrew

Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index d3ec309f2435..8f9c3baeb38e 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -91,6 +91,25 @@ config MTD_NAND_AU1550
           This enables the driver for the NAND flash controller on the
           AMD/Alchemy 1550 SOC.
 
+config MTD_NAND_BF5XX
+        tristate "Blackfin on-chip NAND Flash Controller driver"
+        depends on BF54x && MTD_NAND
+        help
+          This enables the Blackfin on-chip NAND flash controller
+
+          No board specific support is done by this driver, each board
+          must advertise a platform_device for the driver to attach.
+
+          This driver can also be built as a module. If so, the module
+          will be called bf5xx-nand.
+
+config MTD_NAND_BF5XX_HWECC
+        bool "BF5XX NAND Hardware ECC"
+        depends on MTD_NAND_BF5XX
+        help
+          Enable the use of the BF5XX's internal ECC generator when
+          using NAND.
+
 config MTD_NAND_RTC_FROM4
         tristate "Renesas Flash ROM 4-slot interface board (FROM_BOARD4)"
         depends on SH_SOLUTION_ENGINE