From: Graham Moore Date: Tue, 21 Jul 2015 14:39:31 +0000 (-0500) Subject: mtd: nand: denali: max_banks calculation changed in revision 5.1 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=271707b1d817f5104e02b2bd1bab43f0c8759418;p=linux-beck.git mtd: nand: denali: max_banks calculation changed in revision 5.1 Read Denali hardware revision number and use it to calculate max_banks, The encoding of max_banks changed in Denali revision 5.1. Signed-off-by: Graham Moore [Brian: parentheses around macro arg] Signed-off-by: Brian Norris --- diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c index 7b6186ffe3ac..43c0771c587c 100644 --- a/drivers/mtd/nand/denali.c +++ b/drivers/mtd/nand/denali.c @@ -458,8 +458,17 @@ static void find_valid_banks(struct denali_nand_info *denali) static void detect_max_banks(struct denali_nand_info *denali) { uint32_t features = ioread32(denali->flash_reg + FEATURES); + /* + * 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( + ioread32(denali->flash_reg + REVISION)); - denali->max_banks = 2 << (features & FEATURES__N_BANKS); + 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 145bf88930e8..4b12cd302819 100644 --- a/drivers/mtd/nand/denali.h +++ b/drivers/mtd/nand/denali.h @@ -178,6 +178,8 @@ #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