From: Graham Moore grmoore@opensource.altera.com
Read Denali hardware revision number and use it to calculate max_banks, The encoding of max_banks changed in Denali revision 5.1.
[ Linux commit : 271707b1d817f5104e02b2bd1bab43f0c8759418 ]
Signed-off-by: Graham Moore grmoore@opensource.altera.com [Brian: parentheses around macro arg] Signed-off-by: Brian Norris computersforpeace@gmail.com [Masahiro: import from Linux and adjust ioread32() to readl() ] Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com
---
drivers/mtd/nand/denali.c | 11 ++++++++++- drivers/mtd/nand/denali.h | 2 ++ 2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c index 018d14f..5894fcc 100644 --- a/drivers/mtd/nand/denali.c +++ b/drivers/mtd/nand/denali.c @@ -431,7 +431,16 @@ static void find_valid_banks(struct denali_nand_info *denali) static void detect_max_banks(struct denali_nand_info *denali) { uint32_t features = readl(denali->flash_reg + FEATURES); - denali->max_banks = 2 << (features & FEATURES__N_BANKS); + /* + * Read the revision register, so we can calculate the max_banks + * properly: the encoding changed from rev 5.0 to 5.1 + */ + u32 revision = MAKE_COMPARABLE_REVISION( + readl(denali->flash_reg + REVISION)); + if (revision < REVISION_5_1) + denali->max_banks = 2 << (features & FEATURES__N_BANKS); + else + denali->max_banks = 1 << (features & FEATURES__N_BANKS); }
static void detect_partition_feature(struct denali_nand_info *denali) diff --git a/drivers/mtd/nand/denali.h b/drivers/mtd/nand/denali.h index 93b5725..db1457a 100644 --- a/drivers/mtd/nand/denali.h +++ b/drivers/mtd/nand/denali.h @@ -166,6 +166,8 @@
#define REVISION 0x370 #define REVISION__VALUE 0xffff +#define MAKE_COMPARABLE_REVISION(x) swab16((x) & REVISION__VALUE) +#define REVISION_5_1 0x00000501
#define ONFI_DEVICE_FEATURES 0x380 #define ONFI_DEVICE_FEATURES__VALUE 0x003f